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JP2003299177

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2003299177
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flextensional transmitter used in a liquid such as water.
[0002]
2. Description of the Related Art The perspective view of FIG. 1 shows a shell consisting of a
pillar whose central portion A bulges in a chevron, and is called a class IV type shell. Further, the
perspective view of FIG. 2 shows a shell composed of a pillar whose central part A is curved in a
valley shape, and is called a class VII type shell.
[0003]
FIG. 3 shows the configuration of a flextensional transmitter (hereinafter, referred to as a class IV
transmitter) using the above-described class IV type shell 11. This class IV type transmitter has a
converter 21 (hereinafter referred to as a drive element) for converting an electric signal into
vibration as shown in the figure and a shell 11 coupled on the major axis. When the drive
element 21 vibrates in the long axis direction, the vibration is bent and transmitted from the long
axis surface of the shell 11 to the vibration of the short axis surface whose phase is opposite, and
the vibration is generated from the larger area short axis transmission wavefront. Energy (also
acoustic energy) is emitted. The acoustic energy to be emitted is maximum at the bending
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acoustic frequency, and the bending resonance can be easily set to a lower frequency than the
resonance frequency of the drive element 21 itself, so that it is useful as a transmitter of a lower
frequency band.
[0004]
And since this class IV type transmitter is used in a liquid, for example, water, the upper and
lower surface portions of the shell 11 are covered with upper and lower plates (not shown)
acting as lids. An O-ring or the like is sealed between the upper and lower plates. Also, in order to
keep the friction between the shell 21 and the upper and lower plates constant due to sealing
regardless of the pressure applied in water, a support 31 is provided between the upper and
lower plates.
[0005]
FIG. 4 shows the configuration of a flextensional transmitter (hereinafter referred to as a class VII
transmitter) using the above-mentioned class VII shell 12. This class VII type transmitter has a
drive element 22 and a shell 12 coupled on the major axis as shown in the figure. When the drive
element 22 vibrates in the long axis direction, the vibration is bent and transmitted from the long
axis surface of the shell 12 to the vibration of the short axis surface, and the long axis surface
and the short axis surface of the shell 12 vibrate in the same phase.
[0006]
And since this class VII type transmitter is used underwater, the upper and lower surface
portions of the shell 12 are covered with upper and lower plates (not shown) acting as lids, and
between the shell 12 and the upper and lower plates Is sealed with an O-ring. Further, regardless
of the water pressure, in order to keep the friction between the shell 12 and the upper and lower
plates constant due to sealing, a support 32 is provided between the upper and lower plates.
[0007]
FIG. 5 shows a class IV type transmitter in which a class IV type shell 13 and a drive element 23
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are fluidly coupled. The fluid connection used here is a structure for solving the problem that the
drive element 23 is compressed or pulled when the shell 13 is deformed by water pressure or
thermal expansion. As shown in FIG. 5, the fluid chamber 41 is filled with the filling oil 42 and
provided with a piston portion 24 directly connected to the drive element 23. The piston portion
24 is provided with a through hole 25 so that the filling oil 42 can move in the fluid chamber 41
divided by the piston portion 24. Since this fluid coupling can be regarded as a Helmholtz
resonance system, the shell 13 and the drive element 23 are not coupled in a static behavior in
which the shell 13 is deformed in response to a change in depth, but in a desired specific
vibration frequency band The shell 13 and the drive element 23 are integrally coupled, and
function as a normal transmitter.
[0008]
However, in the class IV type transmitter shown in FIG. 3, when the shell 11 vibrates, the major
axis and the minor axis are in opposite phase, so that it is substantially effective. There is a
problem that the transmission area is reduced. When the transmission area is expanded to solve
this problem, a problem arises in that the entire transmitter becomes large. In addition, when the
area of the major surface is reduced, there is a problem that the size and specifications of the
drive element 21 to be coupled are restricted.
[0009]
In the class VII type transmitter shown in FIG. 4, the transmitting area can be set larger than that
of the class IV type transmitter because the major axis and the minor axis are in phase when the
shell 12 vibrates. . However, the gap between the shell 12 and the drive element 22 is narrow at
the central portion where the short axis surface is curved inward. Therefore, when considering
the operation of a Class VII type wave transmitter under high water pressure, a column 33 with
sufficient rigidity is installed in the space near the center of the short axis plane where the
displacement of the shell 12 is the largest. There is a problem that it is difficult to do. When the
drive element 11 is made thin in order to solve this subject, the subject that the size and
specification of the drive element 11 are restricted arises. Further, when the width in the short
axis direction of the shell 12 is increased, there is a problem that the stress transmission
efficiency from the drive element 22 to the short axis surface of the shell 12 is deteriorated.
[0010]
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In the fluid coupling method shown in FIG. 5, there is a problem that the manufacturing process
is complicated and time-consuming because it is necessary to remove the mixed air bubbles from
the filling oil 42 of the fluid chamber 41 in the fluid coupling manufacturing process. . Moreover,
in order to prevent cavitation at the time of negative pressure, the fluid chamber 41 needs to be
pressurized, and there is a problem that maintenance is required to cope with the pressure
decrease with time in the fluid chamber 41 or pressure change due to temperature. .
[0011]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention is a transmitter used in water, comprising two class IV type shells, a drive element and
a lid, Another class IV type shell is disposed inside the class IV type shell, and the drive element
is disposed on both sides of the major axis of the two shells and coupled to the two shells, and
the lid houses the drive element The present invention provides a transmitter having a structure
in which the space is sealed.
[0012]
Furthermore, the present invention is a transmitter used in water, comprising two class VII shells,
a drive element, and a lid, wherein another class VII shell is inside the class VII shell. Provided is
a wave transmitter having a structure in which the drive element is disposed on both sides of the
long axis of the two shells and is coupled to the two shells, and the lid encloses the space in
which the drive element is housed. It is a thing.
[0013]
Further, the present invention is a transmitter used in water, comprising a class VII type shell, a
class IV type shell, a drive element, and a lid, wherein the class IV type shell is formed inside the
class VII type shell. Is provided, the drive element is disposed on both sides of the major axis of
the two shells and coupled to the two shells, and the lid portion provides a transmitter of a
structure in which the space in which the drive element is housed is sealed. It is
[0014]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The transmitter of the present invention will
be described below with reference to the drawings.
[0015]
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The structure of 1st Embodiment is shown in FIG. 6 about the wave transmitter of this invention.
This embodiment is characterized in that a class IV type shell 15 (hereinafter referred to as inner
shell A) is disposed inside a class IV type shell 14 (hereinafter referred to as outer shell A).
[0016]
In this transmitter, the drive elements 26 are disposed on both sides of the long axis between the
outer shell A 14 and the inner shell A 15, and both ends of the drive element 26 are not shown in
FIG. It is fluidly coupled to the shell A24 and the inner shell A25.
And since this wave transmitter is used underwater, as shown to the same figure, the range of the
outer surface of outer shell A24 and the inner surface of inner shell A25 has the role of a lid in
the upper and lower sides not shown upper and lower plates The outer surface of the outer shell
A24 and the inner surface of the inner shell A25 are in contact with water.
Sealing using an O-ring or the like is applied to the contact portion between the outer shell A 24
and the inner shell A 25 and the upper and lower plates in order to obtain an airtight
performance.
In addition, in order to keep friction with outer shell A24 and inner shell A25, and an upper and
lower plate constant, the post | mailbox for supporting an upper and lower plate with respect to
water pressure is installed as needed.
[0017]
Next, the operation of the first embodiment of the transmitter according to the present invention
will be described. As described above, the transmitter is installed in the liquid, and the outer
surface of the outer shell A14, the upper and lower plates, and the inner surface of the inner
shell A15 are in contact with water. During the emission of acoustic energy, the drive element 26
vibrates. For example, when the drive element 26 extends, the outer shell A14 extends in the
longitudinal direction and the inner shell A15 contracts. In the primary mode, the short-axis
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surface of the outer shell A14 works in the direction of drawing water, and the short-axis surface
of the inner shell A15 also works in the direction of drawing water, based on the center of the
shell. When the drive element 26 is contracted, the short axis surface of the outer shell A14
works in the direction to push water, and the short axis surface of the inner shell A15 works in
the direction to push water, according to the same principle.
[0018]
Therefore, in the radiation in water, the medium exclusion of the outer shell A 14 and the inner
shell A 15 is in phase. Further, because of the size of the shells, the resonance frequency of the
inner shell A15 is higher than that of the outer shell A14, so the inner shell A15 also vibrates
within the range of the primary mode during primary resonance of the outer shell A14.
Therefore, the outer shell A14 and the inner shell A15 have the short axis faces with each other
and the long axis faces with the same phase, and the transmission area as a whole is increased
based on the size of the outer shell A14.
[0019]
The structure of 2nd Embodiment is shown in FIG. 7 about the wave transmitter of this invention.
This embodiment is characterized in that a class VII type shell 17 (hereinafter referred to as
inner shell B) is disposed inside a class VII type shell 16 (hereinafter referred to as outer shell B).
[0020]
In this transmitter, the drive elements 27 are disposed on both sides of the long axis between the
outer shell B 16 and the inner shell B 17 and both ends of the drive element 27 are not shown in
the same figure, but they are respectively outside It is fluidly coupled to the shell B16 and the
inner shell B17. And since this wave transmitter is used underwater, as shown to the same figure,
the range of the outer surface of outer shell B16 and the inner surface of inner shell B17 has a
role of a lid part in the upper and lower sides not shown upper and lower plates The outer
surface of the outer shell B16 and the inner surface of the inner shell B17 are in contact with
water. Sealing using an O-ring or the like is applied to the contact portion between the outer shell
B 16 and the inner shell B 17 and the upper and lower plates in order to obtain an airtight
performance. Further, in order to keep the friction between the outer shell B 16 and the inner
shell B 17 and the upper and lower plates constant, support columns 34 for supporting the
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upper and lower plates against water pressure are provided.
[0021]
In the structure using the conventional class VII type shell, it was difficult to install a sufficiently
sized column inside the central portion of the shell short axial surface. However, in the present
embodiment, since the inner shell B17 is curved inward, the space between the drive element 27
and the outer shell B16 is expanded, and a pillar larger than the conventional one can be inserted
to obtain high water pressure resistance performance. Can.
[0022]
Next, the operation of the second embodiment of the transmitter according to the present
invention will be described. As described above, the transmitter is installed in water, and the
outer surface of the outer shell B16, the upper and lower plates, and the inner surface of the
inner shell B17 are in contact with water. The outer shell B16 and the inner shell B17 in the
primary mode vibrate in phase with respect to the vibration of the drive element 27 during the
acoustic energy radiation. Further, since the resonance frequency of the inner shell B17 with
respect to the outer shell B16 is high due to the size relationship, the inner shell B17 vibrates
within the range of the primary mode also at the primary resonance of the outer shell B16.
Therefore, in the case of radiation in water, both the outer shell B 16 and the inner shell B 17
always have the same phase of medium exclusion as in the first embodiment, and the
transmission area increases as a whole.
[0023]
In addition, the support | pillar 34 in this Embodiment is installed as needed with respect to the
water pressure added to a wave transmitter. Therefore, the present embodiment is not limited to
the configuration having the support 34.
[0024]
The structure of 3rd Embodiment is shown in FIG. 8 about the wave transmitter of this invention.
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This embodiment is characterized in that a class IV type shell 29 (hereinafter referred to as inner
shell C) is disposed inside a class VII type shell 18 (hereinafter referred to as outer shell C).
[0025]
In this transmitter, the drive element 27 is disposed on both sides of the long axis between the
outer shell C18 and the inner shell C19, and both sides of the drive element 27 are respectively
provided with the outer shell C18 and the inner shell C19 by bolts or the like. It is combined. And
since this wave transmitter is used underwater, as shown to the same figure, the range of the
outer surface of outer shell C18 and the inner surface of inner shell C19 has the role of a lid in
the upper and lower sides not shown upper and lower plates The outer surface of the outer shell
C18 and the inner surface of the inner shell C19 are in contact with water. Sealing using an Oring or the like is applied to the contact portion between the outer shell C18 and the inner shell
C19 and the upper and lower plates in order to obtain an airtight performance.
[0026]
Next, the operation of the third embodiment of the transmitter according to the present invention
will be described. As described above, the transmitter is installed in water, and the outer surface
of the outer shell C18, the upper and lower plates, and the inner surface of the inner shell C19
are in contact with water. The phases of the vibrations of the outer shell C18 and the inner shell
C19 in the primary mode are opposite in phase to the vibration of the drive element 15 during
the emission of acoustic energy, but the short axis surface is in phase but the same phase is in
the long axis surface Underwater medium rejection in the direction is in phase. Therefore, the
transmission area is almost the same as in the prior art.
[0027]
Next, a case where a pressure is applied in water to the wave transmitter of the third
embodiment will be described. When water pressure is applied to the transmitter, the outer shell
C 18 is deformed in the overall shrinking direction to generate a force that pushes the drive
element 28 in the long axis direction. The inner shell C19 expands in the minor axis direction
with respect to pressure, but deforms in the major axis direction so as to contract, so that a force
is generated to pull the drive element 28 inward. As a result, in a state in which pressure is
applied to the transmitter, the component to be moved inward is dominant rather than the
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component to deform the drive element 28, so the tensile force and compressive force applied to
the drive element 28 are It is much smaller than conventional transmitters. Therefore, the
coupling between the drive element 28 and the outer shell C 18 and the inner shell C 19 does
not need to use fluid coupling for suppressing the deformation of the drive element 28, and a
direct coupling structure by bolts or the like can be made.
[0028]
FIG. 9 shows the configuration in the case of using the wave transmitter of the present
embodiment under high water pressure. In order to keep the friction between the outer shell C18
and the inner shell C19 and the upper and lower plates constant, support posts 35 for
supporting the upper and lower plates are provided. In this case, as shown in the figure, since the
short-axis central portions of the outer shell 18C and the inner shell 19C are close to each other,
the support is provided in the water inside the inner shell C19. Therefore, the range of the upper
and lower plates extends to the inside of the inner shell 29 as shown in FIG.
[0029]
As described above, according to the first embodiment, the entire transmission area of only the
transmission integral of the inner shell is made with respect to the transmitter using the
conventional class IV type shell. And increase the overall size of the Class IV shell wave
transmitter or forcibly reduce the area on the long side of the shell to restrict the dimensions of
the drive element, and also to increase the Class IV type. It is possible to increase the output by
compensating for the acoustic loss due to the phase of the aqueous medium rejection in the
major surface and the minor surface of the shell being in reverse phase.
[0030]
In addition, according to the second embodiment, a water resistance column is inserted between
the outer shell and the inner shell in the central portion of the short axial plane with respect to
the transmitter using the conventional class VII type shell. Space is secured, and there is an effect
of improving the water pressure resistance performance without increasing the size of the whole,
and it is possible to increase the output by increasing the transmission area.
[0031]
Further, according to the third embodiment, compared to the conventional transmitter in which
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the drive element and the shell are directly connected, the tensile force and the compression
force applied to the drive element are much smaller, and the drive element and the shell are
directly connected. Since the deformation of the drive element is small, the change in
performance of the drive element due to water pressure can be reduced.
Therefore, there is no need for fluid coupling to prevent deformation of the drive element due to
water pressure, and simplification of the manufacturing process and maintenance of the fluid
chamber are not necessary.
[0032]
Brief description of the drawings
[0033]
Fig. 1 Configuration of class IV type shell
[0034]
Fig. 2 Configuration of class VII type shell
[0035]
Fig. 3 Configuration diagram of the class IV type flextensional transmitter
[0036]
Fig.4 Configuration diagram of Class VII Flex Tensioner transmitter
[0037]
Fig. 5 Configuration diagram of Class IV flextensional transmitter using fluid coupling
[0038]
6 is a block diagram of a flextensional transmitter according to the first embodiment
[0039]
7 is a block diagram of a flextensional transmitter according to the second embodiment.
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[0040]
8 is a block diagram of a flextensional transmitter according to the third embodiment
[0041]
Fig. 9 Configuration diagram when using the flex tensioner transmitter according to the third
embodiment under high water pressure
[0042]
Explanation of sign
[0043]
11, 13, 14, 15, 19 Class IV type shell 12, 16, 17, 18 Class VII type shell 21, 22, 23, 26, 27, 28
Driving element
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