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JP2007290702

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007290702
The present invention provides a underwater acoustic radiation apparatus for ships capable of
reproducing broadband sound in water. A bottom 410 of a ship unit 400 is formed of FRP or the
like. A plurality of actuators 200 are provided at regular intervals on an inner flat portion of the
ship bottom portion 410. When the vibration control device receives an audio signal or the like
corresponding to the instruction content through the microphone, the vibration control device
performs equalization processing, level adjustment processing, etc. on the audio signal, and
outputs the amplified electrical signal to the plurality of actuators 200. . The actuator 200
converts the received electrical signal into a mechanical vibration signal to vibrate the flat
portion, whereby a sound corresponding to the content of the instruction is emitted. [Selected
figure] Figure 28
Underwater acoustic radiation system for ships
[0001]
The present invention relates to an underwater acoustic radiation apparatus for ships that emits
sound in water such as lakes, rivers, seas, pools and the like.
[0002]
In a swimming pool used for synchronized swimming, underwater volleyball training, etc., an
underwater speaker is used to give various instructions to a player performing BGM (Back
Ground Music) in water or performing in water. There is.
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32 and 33 are views exemplifying the installation state of the underwater speaker in the pool or
the like. For example, when a musical tone signal for BGM is given to the underwater speakers
disposed at two corners of the pool shown in FIGS. 32 and 33, a sound corresponding to the
musical tone signal is outputted from the underwater speaker, and the player uses water as a
medium Transmit to the ear. In the water, the player's outer ear is blocked by the water, and the
eardrum's hearing ability is lost, but it is possible to obtain hearing ability by so-called bone
conduction in which sound is directly guided to the inner ear via the skull. That is, a player who
performs in the water can hear the sound output from the underwater speaker by the bone
conduction.
[0003]
However, in the above-described conventional underwater speakers, reproduction of sound in a
wide band (in particular, a low frequency band) is extremely difficult (details will be described
later), and the frequency characteristic variation of sound output from each underwater speaker
is large There was a problem (details will be described later). In addition, when an underwater
speaker is installed in the pool, for example, as shown in FIG. 33, a facility for suspending the
underwater speaker may be provided (in the case where the training pool is a temporary facility,
etc.) It is necessary to provide a dedicated box and a protective member etc. (not shown) for
installation at a location (if the training pool is a fixed installation etc.), and furthermore, the
installation position should not be determined in consideration of the directivity characteristics
of the underwater speaker. There was a problem of trouble. Moreover, such an underwater
speaker has a problem that the type is limited due to the peculiarity of the specification, and the
cost is high. The present invention has been made in view of the above-described circumstances,
and it is an object of the present invention to provide a underwater acoustic radiation apparatus
for ships capable of reproducing wide band sound in water.
[0004]
In order to solve the above-mentioned problems, the present invention is a device provided on a
ship and emitting sound from the ship into water, which is a thin plate made of a material which
forms an interface with water and maintains light weight and rigidity. A plurality of vibration
means provided on the bottom of the constructed vibratable ship, converting the input electric
signal into a mechanical vibration signal and vibrating the bottom, and corresponding to the
sound to be radiated into the water And vibration control means for supplying the electrical
signal to the plurality of vibration means.
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[0005]
According to this configuration, the vibration means provided at the bottom of the ship vibrates
the wall surface and emits the sound into the water when receiving the electric signal
corresponding to the sound to be emitted into the water.
Generally, it is known that sound in a low frequency band with a long wavelength can be
satisfactorily reproduced by increasing the vibration area in the speaker (details will be described
later), but in the present invention, the bottom of the ship itself is vibrated. Therefore, the
vibration area is larger than that of an underwater speaker or the like. Therefore, it is possible to
reproduce sound in a wide band (in particular, low frequency band) in water.
[0006]
As described above, according to the present invention, it is possible to reproduce wide band
sound in water.
[0007]
Hereinafter, in order to make the present invention easier to understand, an embodiment in
which the present invention is applied to a pool used for synchronized swimming and the like
will be described.
Such an embodiment shows one aspect of the present invention, and can be arbitrarily changed
within the scope of the technical idea of the present invention.
[0008]
A. Present Embodiment <Configuration of Pool 1> FIG. 1 is an exploded perspective view of the
pool 1 according to the present embodiment, FIG. 2 is a perspective view showing a connecting
portion of the side wall unit 2 and the floor unit 3, FIG. FIG. 3 is a cross-sectional view taken
along line II in FIG. The pool 1 is a temporary pool installed, for example, at the time of holding a
swimming championship, etc., and includes a side wall unit 2 formed by FRP (Fiberglass
Reinforced Plastic), a floor unit 3, a garter unit 4 and the like . In the present embodiment, it is
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desirable that the wall surface member of the pool, which forms the interface with water, be
made of a material that is as light and rigid as possible in order to function as an acoustic
diaphragm that radiates into water. Such materials include stainless steel, aluminum, copper and
the like in addition to the above-mentioned FRP, and when the wall surface made of these
materials vibrates, the wall surface itself vibrates as a thin plate.
[0009]
As shown in FIGS. 1 and 2, the side wall unit 2 includes a vertical wall 5 extending in the vertical
direction, a bottom wall 6 extending substantially horizontally from the lower end of the vertical
wall 5 to the inside of the pool, and an upper end of the vertical wall 5. The coping 7 extending
outward from the pool is integrally formed. As shown in FIG. 1, a plurality of flanges 8 extending
outward from the pool are integrally formed on the vertical wall 5 and the coping 7, and both
horizontal ends of the vertical wall 5 as shown in FIGS. Is provided with a connecting flange 8a.
[0010]
As shown in FIG. 1, the floor units 3 are formed in a plate shape having a rectangular shape in a
plan view, and a large number of the floor units 3 are disposed so as to be spread inside the side
wall units 2 assembled in a frame shape. The garter unit 4 is for guiding the water in the pool 1
to a drainage device (not shown), and as shown in FIG. 1, the garter 4a formed in a U-shaped
cross section opening upward, and the garter 4a. And a cover 4b with a slit attached to the
opening of the cover.
[0011]
The pool 1 which concerns on this embodiment mutually fastens and assembles each unit 2-4
formed by FRP with fastening members, such as a rivet and a bolt. The configuration and the like
of the pool 1 are not directly related to the subject matter of the present invention, and thus
further description is omitted. The configuration and the like of a pool (hereinafter, appropriately
referred to as an FRP pool) assembled by fastening a plurality of units formed by FRP is
described in detail, for example, in JP-A-2001-98781.
[0012]
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<Configuration of Underwater Acoustic Radiation Device 100> FIG. 4 is a schematic view for
explaining the underwater acoustic radiation device 100 according to the present embodiment
when the side wall unit 2 is viewed from the pool outer side (see FIG. 2). FIG. 5 is a crosssectional view of the side wall unit 2 in FIG. 4 taken along line II-II. As shown in FIG. 4, the
underwater acoustic radiation device 100 is provided with a plurality of actuators 200 as
vibration sources directly attached to the back surface (outside surface of the pool) of the
sidewall unit 2 of the pool 1 and electrical signals corresponding to the sound to be generated.
The vibration control apparatus 300 and the like that supply the actuator 200 are configured.
[0013]
Each actuator 200 has a width 500 (mm) and a height 1500 (mm) formed by flanges 8 provided
on the back surface of the side wall unit 2 at regular intervals and a plate-like member 9
extending in a direction orthogonal to the flanges 8. It is provided in the approximate center
position of back unit 10 of the above. As shown in FIG. 5, an actuator mounting notch 11 formed
by cutting out the acrylic foam material is provided at substantially the center position of the
back unit 10 formed of FRP, acrylic foam material, etc. The actuator 200 is directly fixed (tightly
fixed) to the notch 11 by an adhesive or the like (see FIG. 5).
[0014]
<Configuration of Actuator 200> FIG. 6 is a view of the actuator 200 as viewed from the arrow
direction shown in FIG. 5, and FIG. 7 is a cross-sectional view of the actuator 200 in FIG. The
actuator 200 constitutes a closed container by a cylindrical cover 210 and a vibration
transmittable frame 220 fixed to the cover 210 by a screw or the like. As shown in FIG. 6, the
actuator 200 is directly fixed to the notch 11 of the back unit 10 by an adhesive or the like
applied to the back of the frame 220. The frame 220 is formed of various materials capable of
transmitting vibrations, such as aluminum and stainless steel, and one end is fixed to the inner
side of the center of the frame 220 as shown in FIG. Is provided with a cylindrical tube member
wound around.
[0015]
In the center of the inside of the cover 210, a donut plate-like plate (first pole piece) 240, a
permanent magnet 250 whose one end is fixed to the plate 240, and one end at the other end of
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the permanent magnet 250 A bottom (second pole piece) 260 having a cylindrical portion fixed
and extending from the center to the frame 220 side, one end fixed to the other end of the
bottom 260 and the other end fixed to the inside of the upper surface of the cover 210 A damper
270 is provided.
[0016]
Here, the magnetic flux generated from the permanent magnet 250 forms a closed magnetic path
so as to cross the voice coil 230 via the first pole piece 240 and the second pole piece 260.
When an electric signal corresponding to the sound to be propagated into water is supplied from
the vibration control device 300 to the voice coil 230 through the cable 280, the electric signal is
transmitted to the first pole piece 240 and the second pole piece 260. The voice coil 230
converts the vibration signal into a mechanical vibration signal to vibrate the frame 220 capable
of vibration transmission. As described above, since the frame 220 is directly fixed to the notch
portion 11 of the back unit 10 by an adhesive or the like, the vibration generated in the frame
220 is the entire back unit 10 surrounded by the flange 8, that is, It is transmitted to the thin
plate and emitted as sound into the water inside the pool (see FIG. 5).
[0017]
FIG. 8 is a view schematically showing an arrangement example of the actuators 200 with
respect to the pool 1. In the pool 1 having a length of 50 (m), a width of 25 (m), and a depth of 3
(m) shown in FIG. 8, 96 actuators 200 are provided on the back surface (outside of the pool) of
the side wall surface on the dive side There is. More specifically, on the back surface of the
plurality of side wall units 2 forming the side wall surface on the ingress side, 24 actuators 200
are installed at a constant interval on the upper stage in the left direction (about 12 (m)) from the
center line. (That is, 24 actuators) are installed at the same interval in the lower stage.
[0018]
Similarly, for the rightward direction (about 12 (m)) from the center line, 24 actuators 200 are
installed at regular intervals in the upper stage, and the same number of actuators 200 are
installed at the same interval in the lower stage. Here, a large number of back surface units 10
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having a width 500 (mm) and a height 1500 (mm) are formed on the back surface of the side
wall unit 2 (see FIG. 4). When the actuator 200 is attached, a substantially central position of the
back surface unit 10 is determined, and by attaching the actuator 200 to the central position, the
plurality of actuators 200 can be installed at constant intervals on the back surface of the side
wall surface. . As described above, the plurality of actuators 200 provided on the back surface of
the plurality of side wall units 2 forming the side wall surface on the jumping side are connected
to the vibration control device 300 via the cable 280.
[0019]
<Configuration of Vibration Control Device 300> FIG. 9 is a diagram showing a configuration of
the vibration control device 300. As shown in FIG. The vibration control device 300 includes a
mixer 310, compressors 320-1 and 320-2, and amplifiers 330-1 to 330-4. In the following
description, the two compressors 320-1 and 320-2 and the four amplifiers 330-1 to 330-4 are
simply referred to as the compressor 320 and the amplifier 330 when it is not necessary to
distinguish them.
[0020]
The mixer 310 inputs a voice signal input from a microphone (not shown) or the like, a musical
tone signal such as BGM generated or reproduced by a musical tone generation / reproduction
device not shown, and the like, and performs mixing processing and the like. Output to the
compressor 320. The mixer 310 has an equalizing function and a level adjusting function,
branches the signal of one channel (CH) after mixing into 4 CH, performs equalizing processing,
level adjusting processing and the like on each signal after branching, and outputs a compressor
Output to 320.
[0021]
The compressor 320 has a 2CH input / 2CH output specification, controls an input signal from
the mixer 310 so as to prevent an excessive signal input to the actuator 200, and outputs the
signal to the amplifier 330. The amplifier 330 is of 1 CH input / 4 CH output specification,
amplifies the signal of 1 CH input from the mixer 310 via the compressor 320, branches to 4 CH,
and is connected to the plurality of actuators 200 connected to the amplifier 330. Output. More
specifically, each of the amplifiers 330-1, 330-2, 330-3, and 330-4 has 24 actuators installed on
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each of the upper left, lower left, upper right, and lower right shown in FIG. Each is connected to
200.
[0022]
FIG. 10 is a diagram showing an example of connection between the actuator 200 and the
amplifier 330. As shown in FIG. Six actuators 200-1 to 200-6 shown in FIG. 10 are actuators
provided in the block A shown in FIG. 8 described above, and actuators 200-2 and 200-4 are
provided to the 1CH positive terminal of the amplifier 330-1. , 200-6 are connected, and the
actuators 200-1, 200-3, and 200-5 are connected to the 1CH negative terminal of the amplifier
330-1, and the actuator 200-2 and the actuator 200-1, the actuator 200-4 and the actuator are
connected. The actuator 200-3, the actuator 200-6 and the actuator 200-5 are connected in
series.
[0023]
As described above, by using the amplifier 1CH for each of the six actuators 200, it becomes
possible to drive the twenty-four actuators 200 disposed on the upper left side with one amplifier
330-1. The connection between the other amplifiers 330-2, 330-3, and 330-4 and the actuator
200 can be similarly described, and thus the description thereof will be omitted.
[0024]
When the vibration control device 300 having such a configuration receives a musical tone
signal such as BGM from the above-described musical tone generation / reproduction device etc.,
the musical tone signal is subjected to equalization processing, level adjustment processing, etc.
and amplified. A signal is output to the actuator 200. Here, for example, in the case of
synchronously driving the plurality of actuators 200 provided on the back surface of the side
wall surface in phase, the same equalization processing and level adjustment on each signal of
1CH to 4CH branched in the mixer 310 Apply processing etc.
[0025]
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As a result, the vibration control device 300 supplies the same level electrical signals to the
plurality of actuators 200 provided on the back surface of the side wall surface, and as a result,
the respective actuators 200 are synchronously driven in phase and underwater in the pool. Will
be emitted as sound. Hereinafter, the underwater speaker demonstrated in the term of the prior
art is made into a comparative example, and the various effects obtained from the underwater
acoustic radiation apparatus 100 which concerns on this embodiment are demonstrated.
[0026]
<First Effect> FIG. 11 is a diagram showing experimental results in the case of conducting a
frequency characteristic evaluation experiment using an underwater speaker under the following
conditions. Note that the horizontal axis shown in FIG. 11 indicates the frequency (Hz) of the
sound output from the underwater speaker, and the vertical axis indicates that the accuracy of
the measuring device is 1.0 (V) = 0 (dB). The sound pressure level in the water (dB) relative to
that reference. a) Experimental conditions-Install an underwater speaker (dimension; diameter 20
(cm) x height 6 (cm)) on the side wall of the FRP pool, and install an underwater microphone at a
point 3.5 (m) away from the underwater speaker And measured.
[0027]
As apparent from the experimental results shown in FIG. 11, the sound pressure level obtained
when the sound in the low frequency band (particularly, the band of 250 (Hz) or less) is
reproduced by the underwater speaker is the sound in the middle to high frequency band. Very
small compared to the sound pressure level obtained when This is because the wavelength of
sound in water (sound velocity; about 1460 (m / s)) is longer than the wavelength in air (sound
velocity in air; 340 (m / s)). It originates in not having sufficient vibration area of a speaker to
reproduce a sound. In other words, in order to reproduce low frequency sound of this long
wavelength, it is necessary to make the vibration area of the speaker sufficiently large. In the
acoustic field, it is known that by widening the vibration area, the acoustic radiation efficiency
can be enhanced, and an even sound pressure distribution can be obtained in a wide area
(hereinafter referred to as a known matter).
[0028]
FIG. 12 is a diagram showing experimental results for supporting the above-mentioned known
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matters, and FIG. 13 is a diagram for explaining a speaker array used in this experiment. In this
experiment, a large, small, and two types of speaker arrays were formed by a plurality of flat
plate speakers (dimensions: 150 (mm) long x 335 (mm) wide), and frequency characteristics
were evaluated using each speaker array. The details regarding the experimental conditions are
as follows.
[0029]
<Experimental conditions> a) Small speaker array SP1: Vertical 600 (mm) x horizontal 1005
(mm) b) Large speaker array SP8: Vertical 600 (mm) x horizontal 8040 (mm) The array SP1 was
formed by 12 flat plate speakers (4 sheets long × 3 sheets wide), and the large speaker array
SP8 was formed by 96 flat plate speakers (4 sheets wide × 24 sheets wide) (see FIG. 13). Also, in
the experiment, sounds in various frequency bands are reproduced from the speaker arrays SP1
and SP8, and sound is generated at points (measurement points) separated by 10 (m), 20 (m) and
30 (m) from the speaker arrays SP1 and SP8. Pressure levels SPF1, SPF8 were measured.
[0030]
As shown in FIGS. 12A to 12C, the sound pressure level measured at each measurement point
when the sound in the low frequency band is reproduced using the speaker arrays FPS1 and
FPS8 is the small speaker array FPS1. Is larger when using the large speaker array FPS 8 than
when using. As described above, it has been demonstrated that by increasing the vibration area
(corresponding to the size of the speaker array) in the speaker, it is possible to satisfactorily
reproduce the sound in the low frequency band having a long wavelength. In addition, although
the experimental result shown in FIG. 12 shows the result of having conducted experiment in air,
also about medium (water etc.) other than air, by enlarging the vibration area in a speaker, the
long frequency low frequency An effect is obtained that the sound of the band can be reproduced
well.
[0031]
Here, please refer to FIG. 8 again. As shown in FIG. 8, a large number of back units 10 having a
width of 500 (mm) and a height of 1500 (mm) are formed on the back of the side wall unit 2,
and the back units 10 are vibrated at the center position of each back unit 10. An actuator 200 is
provided. In this embodiment, in order to synchronously drive the actuators 200 provided on the
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respective back surface units 10 in the same phase, the above-described vibration area is 24 (m)
× 3 (m), that is, the area where the actuators 200 are provided. . This vibration area is larger
than the vibration area of the underwater speaker (diameter 20 (cm) × height 6 (cm)). Therefore,
by adopting the underwater acoustic radiation device 100 according to the present embodiment,
it is possible to obtain an effect that sound in a low frequency band having a long wavelength can
be favorably reproduced.
[0032]
In addition, the directivity characteristics of the underwater acoustic radiation device 100 and
the underwater speaker are the vibration plane according to the theory of the circular plane
sound source described in the well-known document (electroacoustic osmology, edited by the
Telecommunications Society of Japan, Corona Corp., p52 to p54). It is determined by the ratio of
the diameter to the wavelength of Here, since the directivity characteristic becomes sharper as
the diameter of the vibration surface becomes larger, the directivity characteristic of the
underwater acoustic radiation device 100 having a large vibration area becomes sharper than the
directivity characteristic of an underwater speaker having a small vibration area. Generally, low
frequency band sounds show no directivity while medium to high frequency band sounds show
sharp directivity. Therefore, when several underwater speakers are installed in the pool,
frequency characteristics change depending on the location Are very different. On the other
hand, in the pool according to the present embodiment, since the plurality of actuators 200 are
installed at a constant interval on the almost entire surface of the back surface of one side wall
surface, even in the far Sound pressure and frequency characteristics can be realized.
[0033]
<Second Effect> FIG. 14 is a view for explaining the case where the sound wave emitted from the
underwater speaker is reflected, and FIG. 14 (a) shows the radiation from the underwater speaker
in the concrete pool whose wall is formed of concrete. FIG. 14B is a view for explaining the case
where the sound wave emitted from the speaker is reflected in the FRP pool targeted by the
present embodiment.
[0034]
As shown in FIG. 14 (a), in the state where the underwater speaker (the distance between the
concrete side wall and the underwater speaker; L1) was installed near the concrete side wall
surface of the concrete pool, the sound wave was output from the underwater speaker In this
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case, the sound wave is reflected by the concrete side wall surface, but the outside of the
concrete side wall is fixed by, for example, concrete or soil, so the concrete side wall acts as a
fixed end, and the fixed end reflected sound wave is reflected. There is no phase shift (phase
inversion).
More specifically, it is assumed that a sound source (mirror image sound source) that outputs a
sound wave in phase with the underwater speaker (that is, a sound wave with no phase shift) is
installed at the mirror image position shown in FIG. In particular, if the distance L1 between the
underwater speaker and the concrete side wall is small compared to the wavelength of the sound
wave emitted from the underwater speaker, the sound wave emitted from the underwater
speaker is emitted from the mirror image source It is hardly canceled by the sound wave (ie, the
sound wave reflected at the fixed end).
[0035]
On the other hand, as shown in FIG. 14 (b), in the state where the underwater speaker is installed
near the FRP side wall surface of the FRP pool (the distance between the FRP side wall and the
underwater speaker; L1), the sound wave is output from the underwater speakers In the case
where the sound wave is reflected on the FRP side wall surface, the FRP side wall is soft unlike
the concrete side wall, and the wall itself can freely vibrate because an air layer exists as a free
space outside the side wall surface. In the state. Therefore, at the time of reflection, the side wall
surface itself vibrates and acts as a free end, and the sound wave reflected at the free end causes
a phase shift (phase shift amount is π) due to the reflection. More specifically, it can be assumed
that a mirror image sound source outputting a sound wave (phase-reversed sound wave) whose
phase is shifted by π is disposed at the mirror image position shown in FIG. 14 (b). The resulting
sound wave is canceled by the sound wave emitted from the mirror image source (i.e., the sound
wave reflected at the free end), resulting in a problem that the sound becomes smaller. In
particular, when the underwater speaker emits a sound wave in a low frequency band with a long
wavelength, the above-mentioned problem appears notably. The phenomenon peculiar to the FRP
pool described above is a finding newly obtained by the applicant of the present invention
through an experiment or the like.
[0036]
On the other hand, the underwater acoustic radiation device 100 according to the present
embodiment vibrates the side wall surface itself by the actuator 200 installed on almost the
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entire surface of the back surface of the side wall surface of the pool 1 (see FIG. 8). . For this
reason, the above problem, that is, the generation of the phase-inverted sound wave output from
the mirror image sound source is not in principle, and there is no sound canceled by the
generation of the phase-inverted sound wave in frequency characteristics. It can be played back.
[0037]
Third Effect Further, the actuator 200 according to the present embodiment is installed on
almost the entire back surface of the side wall surface of the pool 1. That is, unlike the abovedescribed underwater speaker, there is no need to install it in water, so a space for installing the
underwater speaker inside the pool 1 and a facility for installing the underwater speaker inside
the pool 1 (specifically There is no need to provide equipment for suspending the underwater
speaker, a dedicated box, a protective member, etc.). Moreover, in the underwater speaker, the
installable water depth is regulated (for example, the water depth 10 (m) or less), but the
actuator 200 is installed on the back surface of the side wall of the pool 1. m) It can also be
installed in deep pools etc.
[0038]
<Fourth effect> In addition, when the underwater speaker is installed inside the pool 1, the
installation position needs to be determined in consideration of the directivity characteristics of
the underwater speaker described above, but the present embodiment relates to the present
embodiment. The actuators 200 may be installed on almost the entire back surface of the side
wall surface of the pool 1 at regular intervals, and fine adjustment or the like is unnecessary.
[0039]
<Fifth effect> In addition, in the case of installing an underwater speaker inside the pool 1, it is
necessary to install or remove the underwater speaker according to the competition,
synchronized swimming, etc. according to the application and use. However, since the actuator
200 according to the present embodiment is installed on the outside of the pool 1, it can be dealt
with only by turning the power of the actuator 200 ON / OFF.
As a result, it can be permanently installed, and it is not necessary to perform complicated
operations such as installing or removing by competition or by application.
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[0040]
<Sixth Effect> Further, the underwater speaker has a problem that the type is limited due to the
peculiarity of the specification and the cost is high, but the actuator 200, the amplifier 330, etc.
can use the existing actuator, amplifier etc. Therefore, the underwater acoustic radiation device
100 can be configured at low cost.
[0041]
<Seventh effect> In addition, since the underwater speaker is installed in water, it is a waterproof
structure that prevents water intrusion and the like, and a safety circuit that detects an electric
leakage such as an amplifier built in the underwater speaker and automatically shuts it off.
However, since the actuator 200 according to the present embodiment is installed on the back
surface (that is, the air layer side) of the side wall surface of the pool 1, these facilities are not
required at all, and the cost is suppressed. It becomes possible.
[0042]
B.
Modifications Although the embodiment of the present invention has been described above, the
above embodiment is merely an example, and various modifications can be added to the above
embodiment without departing from the spirit of the present invention.
As a modification, for example, the following can be considered.
[0043]
<Modification 1> In this embodiment mentioned above, although pool 1 which concluded and
assembled a plurality of units formed with FRP was explained to an example, a pool constituted,
for example with a stainless steel plate, an aluminum plate, a copper plate etc. It is applicable
also to 1. That is, the present invention is applicable to any pool 1 configured of a material
capable of vibration transmission by the actuator 200. Moreover, in this embodiment, although
the temporary pool was demonstrated to the example, it is needless to say that it can apply to the
pool of a fixed installation.
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[0044]
In the above-described embodiment, the pool (FRP pool) in which the periphery is entirely
formed of thin plates such as FRP is described as an example, but the pool (concrete pool) in
which the periphery is formed by a fixed concrete wall is described. It is also possible to apply
the present invention. Specifically, the concrete pool is provided with a break plate made of FRP
(FRP break plate), and the actuator 200 is closely fixed to the FRP break plate to perform
acoustic radiation. In the case of a concrete pool having a length of 50 (m), a width of 25 (m) and
a depth of 3 (m), the concrete pool may be placed in an appropriate position (length direction 3
(length direction 3) m) At the point, etc., for example, an FRP cut-off plate with a width 25 (m)
and a depth 3 (m) is provided. Thus, it is also possible to apply the present invention to a
conventional concrete pool.
[0045]
<Modification 2> In the above-described embodiment, an electrodynamic actuator has been
described as an example of the actuator 200. However, a piezoelectric type, an electromagnetic
type, an electrostatic type according to the design of the underwater acoustic radiation device
100, etc. And other various actuators can be employed. However, in view of using a large number
of actuators 200, compact ones with high output are desirable, and compact actuators such as
piezoelectric type or electrodynamic type are desirable.
[0046]
<Modification 3> In the above-described embodiment, although the case where the actuators 200
are installed at a constant interval on almost the entire back surface of the side wall surface of
the pool 1 has been described, a predetermined area of the side wall surface (for example, The
actuator 200 may be installed only in the range of 10 (m) and the like from the center line shown
in FIG. In addition, the side wall surface on which the actuator 200 is installed is not limited to
one surface, for example, the side wall surface adjacent to the side wall surface or the side wall
surface facing the side wall surface etc. The actuator 200 may be installed. Moreover, in the
present embodiment, the actuators 200 are installed on the upper and lower two stages of the
back surface of the side wall surface, but the actuator 200 may be installed only on the upper
stage. It may be divided into stages (for example, upper, middle, lower etc.), and the actuator 200
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may be installed for each stage.
[0047]
Modified Example 4 FIG. 15 is a view schematically showing an arrangement example of the
actuators 200 with respect to the pool 1 according to a modified example 4. As shown in FIG. As
shown in FIG. 15, 48 actuators 200 are provided at a constant interval L1 (the same interval as
the present embodiment) on the lower surface of the back surface of the side wall surface of the
pool 1 according to the fourth modification. Twenty-four actuators 200 are provided at constant
intervals L2 (= 2 * L1) on the upper surface of the back surface. As described above, the interval
at which the actuator 200 is provided on the upper surface of the back surface of the side wall
surface may be different from the interval at which the actuator 200 is provided on the lower
surface of the back surface of the side wall surface. In addition, if various effects (such as
frequency characteristics) described in the present embodiment can be obtained, the actuators
200 are provided at random intervals without providing the actuators 200 at constant intervals
on the back surface of the side wall surface. Also good.
[0048]
Here, FIG. 16 is a view schematically showing an arrangement example different from the
arrangement example of the actuator 200 shown in FIG. As shown in FIG. 16, 48 actuators 200
are arranged in a staggered manner on the back surface of the side wall surface of the pool 1.
More specifically, twenty-four actuators 200 are respectively provided at fixed intervals L2 on
the back upper and lower surfaces of the side wall surface of the pool 1, and the actuators 200
are alternately arranged between the upper and lower components.
[0049]
Here, FIG. 17 is a diagram showing the results of measurement of the vibration acceleration level
of the side wall surface when the actuators 200 are arranged in a staggered manner (see FIG. 16)
on the side wall surface of the pool 1 and each actuator 200 is driven. 18 is a partially enlarged
view of the side wall surface of the pool 1 shown in FIG. In addition, when measuring the
vibration acceleration level, a vibration pickup for detecting vibration is attached to a
predetermined location (points A to D; see FIG. 18) on the surface of the side wall surface of the
pool 1 (inside the pool). Did.
04-05-2019
16
[0050]
As shown in FIG. 17, the vibration acceleration level up to about 10 to 600 (Hz) shows a large
difference between the point B behind the installation of the actuator 200-k and the other points
A, C, D. Absent. On the other hand, in the frequency range of 600 (Hz) or more, the vibration
acceleration level at the points A, C, D tends to be lower than the vibration acceleration level at
the point B. In addition, in the entire frequency band, a large difference is not recognized
between the vibration acceleration level at the point A and the vibration acceleration level at the
point D.
[0051]
The contents described above can be summarized as follows. First, the vibration pickup attached
to the point A mainly detects the vibration by the actuator 200-k. On the other hand, the
vibration pickup attached to the point D mainly detects the vibration by the actuator 200-k and
the vibration by the actuator 200-1. There is no significant difference between the vibration
acceleration level detected by the vibration pickup attached to the point A and the vibration
acceleration level detected by the vibration pickup attached to the point D. Therefore, as shown
in FIG. 16 etc., it can be said that the arrangement of the actuators 200 is necessary and
sufficient to be arranged in a zigzag at a constant interval L2.
[0052]
As such, by arranging the actuators 200 on the back surface of the side wall surface of the pool 1
in a staggered manner at a constant interval L2, the number of required actuators 200 can be
reduced without causing the deterioration of the vibration characteristics. It is possible to reduce
the manufacturing cost of the underwater acoustic radiation device 100.
[0053]
<Modification 5> Moreover, although this embodiment mentioned above demonstrated the case
where the several actuator 200 was installed in the back surface of the side wall surface of the
pool 1, For example, it is on the surface (in water side) of the side wall surface of the pool 1. A
plurality of actuators 200 may be provided.
04-05-2019
17
In this case, the actuator 200 needs to be appropriately provided with a waterproof mechanism
for preventing water intrusion and the like, a safety circuit for detecting an electric leakage from
an amplifier and the like built in the underwater speaker, and automatically shutting off, etc.
Effect that the sound in the long low frequency range can be reproduced well, and that uniform
sound pressure and frequency characteristics can be realized even in the distant area in the area
corresponding to the installation width of the actuator 200 (first effect), broadband An effect
(second effect) or the like that the sound of B can be reproduced clearly can be obtained.
Therefore, when there is no space for installing the actuator 200 on the back surface of the side
wall surface of the pool 1, the actuator 200 can be installed on the surface (underwater) of the
side wall surface of the pool 1.
[0054]
<Modification 6> Moreover, although this embodiment mentioned above demonstrated the case
where a plurality of actuators 200 installed in the back of the side wall side of pool 1 were
synchronized and driven in the same phase, for example, the back side of the side wall The sound
in the middle to high frequency band is reproduced using the actuator 200 provided on the
upper stage, while the sound in the low frequency band is reproduced using the actuator 200
provided on the lower surface of the back surface of the side wall The timing of driving the
actuator 200 provided on the upper surface of the back surface may be controlled so as to shift
the timing of driving the actuator 200 provided on the lower surface of the back surface of the
side wall surface. Also, in order to add various effects (such as reverb) to the sound radiated into
water through the side wall surface, an effect function, a sound quality adjustment function, etc.
are provided instead of the vibration control device 300 described in the present embodiment.
The vibration control device 300 may be provided.
[0055]
<Modification 7> Further, in the above-described embodiment, as shown in FIG. 10 described
above, 24 actuators 200 are driven by one amplifier 330 (4 CH output) (6 actuators are driven
by amplifier 1 CH). Although the configuration is such, how many actuators 200 are driven by
one amplifier can be appropriately changed according to the design of the vibration control
device 300 and the like.
[0056]
04-05-2019
18
<Modification 8> In this embodiment mentioned above, although a case where underwater
acoustic radiation equipment 100 was provided in pool 1 was explained, a water tank, a storage
tank, a bathtub, pike which are used, for example for breeding of an underwater plant or an
ornamental fish etc. In addition, the underwater acoustic radiation device 100 is provided in a
liquid medium such as a container used for brewing sake, soy sauce, and miso, etc., and the
sound of BGM etc. is generated inside the water tank etc. in order to promote the growth of
underwater plants etc. You may make it emit.
That is, the water tank described in the claims means any one capable of storing the liquid
medium.
[0057]
<Modification 9> Further, although the case where the actuator 200 is attached to the back
surface of the side wall surface of the pool 1 has been described in the above-described
embodiment, the actuator 200 may be attached to the back surface of the bottom wall surface of
the pool 1 . FIG. 19 is a view schematically showing an arrangement example of the actuators
200 with respect to the pool 1 according to the modification 9, and FIGS. 20 and 21 are views
showing the pool 1 from above.
[0058]
As shown in FIG. 19, the bottom wall surface of the pool 1 is supported by a plurality of convex
portions 500 formed of a rigid member such as concrete. Then, a plurality of actuators 200 are
attached between the convex portions 500 on the bottom wall surface of the pool 1 as in the
above-described embodiment and the like, whereby sound is emitted from the bottom wall
surface toward the water surface Ru. As for the arrangement position of the actuators 200, for
example, as shown in FIG. 20, a plurality of actuators 200 may be arranged at a predetermined
interval L3 on the bottom wall surface corresponding to the competition area on the bottom wall
surface. Alternatively, the plurality of actuators 200 may be disposed on the bottom wall in a
staggered manner at a predetermined interval L4.
[0059]
04-05-2019
19
The reason why the actuator 200 is attached to the back surface of the bottom wall surface
instead of the back surface of the side wall surface of the pool 1 is as follows. That is, the sound
radiated into the water propagates a certain distance (so-called "shallow water" propagation)
while being repeatedly reflected between the water surface and the bottom of the water (bottom
wall surface). In this "shallow water" propagation, When the frequency of the emitted sound
(sound) is low and the water depth becomes approximately the same as the wavelength of this
sound, a phenomenon occurs in which a signal below the cutoff frequency f0 represented by the
following equation (1) is not transmitted The details of the cutoff frequency are described in I.
Tolstoy and CSClay, "OCEAN ACOUSTICS: Theory and Experiment in Underwater Sound", 1987,
etc.).
Formula 1
[0060]
<img class = "EMIRef" id = "201989791-000003" />
[0061]
FIG. 22 is an explanatory view showing conditions and the like when simulating a frequency
characteristic change due to a distance from a sound source in “shallow sea”, and FIG. 23 is a
view showing a simulation result.
As shown in FIG. 22, an underwater speaker serving as a sound source is disposed at a water
depth of 2 m, and the water is submerged at each point a to e at a water depth of 1 m and
separated from the underwater speaker by 1 m, 2 m, 5 m, 10 m, and 15 m. The simulation was
performed on the assumption that a microphone was placed.
[0062]
As a result, as shown in FIG. 23, at a point close to the sound source, although the attenuation of
the sound having a frequency lower than the cutoff frequency f0 (= 128 (Hz)) obtained using
Equation (4) is small, It has been found that the sound attenuation at frequencies below the
cutoff frequency f0 increases as the distance increases, at points further from.
04-05-2019
20
[0063]
Here, FIG. 24 is an explanatory view showing conditions and the like when the above-mentioned
frequency characteristic change is actually measured using the actual pool 1 (formed by FRP),
and FIG. 25 is a view showing a result of the measurement.
As shown in FIG. 24, an underwater speaker serving as a sound source is disposed at the bottom
of the water (at a depth of 3 m) and at a depth of 1.5 m at points a ′ and b ′ separated by 5 m
and 20 m from the underwater speaker. An experiment was conducted with an underwater
microphone placed.
[0064]
As a result, it was revealed that the attenuation of the frequency below the cutoff frequency f0 'at
the point b' far from the sound source is larger than the attenuation of the frequency below the
cutoff frequency f0 'at the point a' near the sound source. In this measurement result, a peak is
observed in the vicinity of 60 Hz of the curve b 'shown in FIG. 25, which is considered to be due
to the influence of BGN (hum due to the power supply frequency) shown in the same figure.
Focusing on the amount of attenuation (the difference between a 'and b' shown in FIG. 25)
ignoring the characteristics at such frequencies, it is uniformly attenuated in the frequency band
below the cutoff frequency f0 ', which is a simulation result. Supporting the
[0065]
As apparent from the simulation results and the measurement results described above, the sound
attenuation increases as the distance from the sound source increases, so for example, when the
actuator 200 is disposed on the back surface of the side wall surface of the pool 1 as shown in
FIG. In the case of a player who performs at a position (under water) away from the side wall
surface, there arises a problem that sound of a frequency near the cutoff frequency f0 is not
transmitted.
[0066]
Therefore, in the present modification, the actuator 200 is attached to the back surface of the
bottom wall of the pool 1, and sound is emitted from the bottom wall toward the water surface,
so that the sound of the frequency near the cutoff frequency f0 is not transmitted to the athlete
I'm avoiding the problem.
04-05-2019
21
[0067]
That is, since the distance (water depth) from the bottom wall surface to the water surface of the
pool 1 is about 1 to 3 m, the distance from the actuator 200 (sound source) attached to the
bottom wall surface to the competitor is within this distance .
Thus, by attaching the actuator 200 to the back of the bottom wall surface of the pool 1, the
distance to propagate the sound becomes short, and as a result, the distance from the sound
source to the competitor is far, so the frequency near the cutoff frequency f0 It is possible to
avoid the problem that the sound of is not transmitted to the competitor.
[0068]
In the present modification described above, although the case where the actuator 200 is
attached to the back surface of the bottom wall instead of attaching the actuator 200 to the back
surface of the side wall surface of the pool 1 has been described, The actuators 200 may be
attached to the back surfaces of the wall surface and the bottom wall surface, respectively.
[0069]
In this case, for example, for the actuator 200 attached to the side wall, regardless of the distance
from the sound source, the sound in the middle and high frequency bands with small attenuation
is radiated into the water, while for the actuator 200 attached to the bottom wall, It may be
configured to emit a low frequency band sound that greatly attenuates according to the distance
of the light into the water.
[0070]
Moreover, while supporting the bottom wall surface of the pool 1 by the several convex part 500
formed of rigid members, such as concrete, this modification demonstrated the case where the
several actuator 200 was attached between each convex part 500. For example, as shown in A, B,
and C of FIG. 26, a plurality of convex portions 600 may be provided on the bottom wall surface
itself of the pool 1 and one (or plural) actuators 200 may be attached to each convex portion
600. .
[0071]
04-05-2019
22
<Modification 10> In the above-described embodiment, although the case where the actuator
200 is directly fixed to the side wall surface with an adhesive or the like (see FIG. 5) has been
described, the side wall surface and the actuator 200 are more firmly fixed. In order to achieve
this, as shown in FIG. 27, a beam H for close contact with the actuator 200 may be provided on
the side wall surface.
[0072]
<Modification 11> Furthermore, although the case where the underwater acoustic radiation
device 100 is provided in the pool 1 has been described in the above-described embodiment, the
underwater acoustic radiation device described above, for example, in a large or small ship or
submarine It is also possible to provide 100.
FIG. 28 is a view showing an appearance of a ship 400 according to the present modification, and
FIG. 29 is a cross-sectional view of the ship bottom portion 410 shown in FIG. 28 taken along
line IV-IV.
The bottom portion 410 of the ship 400 shown in FIG. 28 is formed of the above-described FRP
or the like, and a plurality of actuators 200 are provided on the inner flat portion 410a (see FIG.
29) of the bottom portion 410. And the like are connected to the vibration control device 300.
[0073]
The captain who supervises the navigation of the ship 400 and supervises the crew gives
instructions etc. to the diver who is investigating the seabed in the sea, using a microphone not
shown.
When the vibration control device 300 receives an audio signal or the like corresponding to the
content of the instruction through the microphone, the vibration control device 300 performs
equalization processing, level adjustment processing, etc. on the audio signal, and amplifies the
electric signal to the flat portion 410a at a constant interval. Output to the plurality of actuators
200 installed in
04-05-2019
23
The actuator 200 converts the received electrical signal into a mechanical vibration signal to
vibrate the flat portion 410a, whereby a sound corresponding to the content of the instruction is
emitted.
When a diver who is conducting seabed surveys and the like in the sea listens to the sound
radiated from the flat surface portion 410a of the ship 400, he / she changes the survey area and
the like based on the instruction content of the sound.
[0074]
As described above, the plurality of actuators 200 can be installed at constant intervals on the
inner flat surface portion 410a of the ship bottom portion 410. For example, as shown in FIGS.
30 and 31, the inner curved surface portion of the ship bottom portion 410 It is also possible to
provide a plurality of actuators 200 at regular intervals on the entire inner surface portion 410c
of the bottom portion 410 or 410b. As described above, when the plurality of actuators 200 are
provided at constant intervals on the entire inner surface portion 410c of the bottom portion
410, it is possible to emit sounds such as BGM and voice in all directions centering on the ship
400. . Of course, the above-described modifications can be applied to this modification.
[0075]
It is a disassembled perspective view of the pool in this embodiment. It is a figure which shows
the connection part of the side wall unit and floor unit which comprise a pool. It is an II line
sectional view in FIG. It is a schematic diagram for demonstrating an underwater acoustic
radiation apparatus. It is the II-II line sectional view in FIG. It is a figure showing composition of
an actuator. It is III-III line sectional drawing in FIG. It is a figure which shows the example of
arrangement | positioning of the actuator with respect to a pool. It is a figure showing
composition of a vibration control device. It is a figure which shows the example of a connection
of an actuator and an amplifier. It is a figure which shows the experimental result at the time of
performing frequency characteristic evaluation experiment using an underwater speaker. It is a
figure which shows the experimental result at the time of performing frequency characteristic
evaluation experiment using a speaker array. It is a figure which shows the structure of a speaker
array. It is a figure for demonstrating reflection of the sound radiated from the underwater
speaker. FIG. 16 is a view showing an arrangement example of actuators with respect to a pool
according to a modification 4; It is a figure which shows the example of arrangement |
positioning of the actuator with respect to the pool which concerns on the modification. It is a
04-05-2019
24
figure which shows the measurement result of the vibration acceleration level which concerns on
the modification. It is the elements on larger scale of the side wall surface concerning the
modification. FIG. 21 is a view showing an arrangement example of actuators with respect to a
pool according to a modification 9; It is the figure which looked at the pool which concerns on
the modification from a top. It is the figure which looked at the pool which concerns on the
modification from a top. It is an explanatory view showing conditions etc. when simulating
change of a frequency characteristic concerning the modification. It is a figure which shows the
simulation result concerning the modification. It is an explanatory view showing conditions etc.
when measuring a frequency characteristic change concerning the modification. It is a figure
which shows the measurement result which concerns on the modification. It is the figure which
illustrated the attachment method of the actuator to the bottom wall surface concerning the
modification. It is a figure for demonstrating the beam for actuator contact concerning a
modification 10. FIG. It is a figure which shows the external appearance of the ship which
concerns on the modification 11. FIG. FIG. 29 is a cross-sectional view taken along line IV-IV in
FIG. FIG. 29 is a cross-sectional view taken along line IV-IV in FIG. FIG. 29 is a cross-sectional
view taken along line IV-IV in FIG. It is a figure which illustrates the installation state of the
underwater speaker in the conventional pool etc. It is a figure which illustrates the installation
state of the underwater speaker in the conventional pool etc.
Explanation of sign
[0076]
DESCRIPTION OF SYMBOLS 1 ... pool, 2 ... side wall unit, 10 ... back surface unit, 100 ...
underwater acoustic radiation device, 200 ... actuator, 300 ... vibration control device, 310 ...
mixer, 320 ... compressor, 330 ... amplifier, 400 ... ship, 410 ... ship Bottom portion, 410a ... flat
portion, 410b ... curved portion, 410c ... whole surface portion
04-05-2019
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