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JP2012204886

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DESCRIPTION JP2012204886
An object of the present invention is to ensure the strength of a pressure-resistant container
under water pressure while achieving downsizing and weight reduction, and facilitate the
arrangement and positioning when incorporating a vibrator in the pressure-resistant container to
realize improvement in productivity and reliability. Make it The pressure container 22 of an
acoustic sensor (sensor) housed in a state in which a plurality of transducers 23 are arranged is
fixed between node portions of the plurality of transducers 23 and an inner wall portion of the
pressure container 22. The pressure-resistant container 22, the plurality of vibrators 23, and the
support member 34 are integrally connected via the support member 34. [Selected figure] Figure
3
Sensor pressure container
[0001]
The present invention relates to a pressure container of sensors such as a transmitter and a
receiver used for underwater exploration and measurement.
[0002]
There are acoustic sensors such as transmitters and receivers used in underwater (including
underwater) exploration, measurement, etc.
For example, as shown in the cross-sectional view of FIG. 7, this type of acoustic sensor 1 has a
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plurality of vibrators 3 arrayed inside a pressure resistant container 2. The pressure container 2
includes a back plate 6 and side plates 7 a and 7 b. The vibrator 3 includes a rear mass 8, a
piezoelectric material 9, and a front mass 10. The vibrator 3 is fixed by being sandwiched
between the back plate 6 and the acoustic rubber 4 via the onion skin paper 5.
[0003]
As shown in FIG. 8A, in order to prevent the acoustic sensor 1 from affecting the vibration mode
of the vibrator itself at the time of sound generation, one end of the vibrator 3 is used as a
radiation surface 13 and the other In general, a structure in which the end portion of the
pressure vessel is a fixed portion of the pressure resistant container 2 is used. FIG. 8A shows a
state in which water pressure 11 in the arrow direction is received on both side surfaces of the
pressure container 2 when the acoustic sensor 1 is used in water. Further, FIG. 8B shows a
deformation image when the pressure resistant container 2 is deformed by the water pressure
11, and a calculation formula of deflection when the pressure resistant container 2 receives an
equally distributed load. Ymax is the maximum deflection of the pressure vessel (side plate 7a or
7b), ω is water pressure (uniform distribution load), L is the length between the fulcrums of the
pressure vessel (side plate 7a or 7b), E is the longitudinal elastic modulus, Iz is It is a sectional
second moment.
[0004]
As a method of fixing the vibrator 3 and the back plate 6, there is a method of fixing using a
screw or the like other than the above-mentioned sandwiching. The radiation surface 13 of the
vibrator 3 is a contact surface between the acoustic rubber 4 and the front mass 10. As a
material for forming the acoustic rubber 4, a rubber material or a molding material which is an
elastic material is used so as not to attenuate the vibration generated in the vibrator 3.
[0005]
As a related art of the above-mentioned acoustic sensor, the ultrasonic water treatment device
given in patent documents 1 is known. This device includes a vibrator, a horn as a vibrating body,
a case as a container for holding the horn, a flange, etc., and propagates ultrasonic vibration
generated by the vibrator to the horn processing surface through each part of the horn. It is a
thing. Further, as another related technology, an underwater ultrasonic transducer described in
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Patent Document 2 is known. In this transducer, the vibration direction is matched in the inside
of the elliptical shell, and a gap is provided to enclose the active columnar body as a vibrating
body, and a bolt is penetrated through this and fixed to the long end of the elliptical shell. It is.
[0006]
JP-A-2006-043622 JP-A-H04-334199
[0007]
However, in the acoustic sensor having a structure in which a plurality of transducers having a
long shape such as a prism or a cylinder are arrayed and fixed inside the pressure resistant
container, the conventional fixing method of the transducers has the following problems.
[0008]
As a first problem, as shown in FIG. 8A, since the acoustic rubber 4 of the acoustic sensor is
formed of an elastic material, it does not become a strength member.
For this reason, the pressure-resistant container 2 formed of the back plate 6 which is a strength
member and the side plates 7a and 7b has a U-shaped structure, and the vibrator 3 is fixed.
As a result, the pressure container 2 has a cantilevered structure. As shown in FIG. 8 (a), when
the pressure container 2 having a cantilever structure receives the water pressure 11, the side
plate 7a with the fulcrum 12 corresponding to the junction of the side plates 7a and 7b and the
back plate 6 as a base point. , 7b produce maximum deflection on the acoustic surface 13 side of
the acoustic rubber 4. As a result, the side plates 7a and 7b come in contact with the front mass
10 of the vibrator 3 to adversely affect the acoustic performance. In order to make the pressure
container 2 such that the side plates 7a and 7b do not contact the vibrator 3 in the structure of
the conventional acoustic sensor, the plate thickness of the back plate 6 and the side plates 7a
and 7b is increased, and ribs and reinforcements are provided. It is essential to secure the rigidity
of the pressure container 2 by the addition of parts and the like. However, along with this, the
size and weight reduction of the acoustic sensor will be impeded, and the cost, manufacturability
(complication of the structure due to addition of reinforcement parts, etc.) and the like become
problems.
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[0009]
As a second problem, in order not to suppress the vibration at the time of sound generation of
the acoustic sensor, it is necessary to provide a clearance 16 between the pressure container 2
and the vibrator 3 as shown in FIG. However, in the prior art, when a clearance is provided
between the pressure-resistant container 2 and the vibrator 3, no parts can be provided in which
the pressure-resistant container 2 and the vibrator 3 contact each other. Variation occurs. If
variations occur in the arrangement or position of the vibrator 3 at the time of assembling the
pressure-proof container 2, the vibrator 3 or the acoustic rubber 4 may be damaged when water
pressure is applied to the pressure-proof container 2, or the performance of the acoustic sensor
may be affected. And other problems arise.
[0010]
As a third problem, in order to suppress the deformation of the pressure resistant container 2,
for example, when a support member is provided at the node portion of the vibrator 3, the area
of the contact portion between the vibrator 3 and the support member is determined. It is
necessary to make the shape of the support member an appropriate structure. The reason is that
the node portion of the vibrator 3 is a point of vibration mode, and in order to reduce the
influence on the acoustic performance, it is ideal that the support member is connected to the
vibrator by a point or a line. However, in this case, when the water pressure is applied to the
pressure-resistant container 2, the strength of the material of the vibrator 3 does not exist and
the vibrator 3 is broken. Therefore, the structure of the support member such that the vibrator 3
and the support member have an appropriate contact area. You need to However, in the prior art,
a pressure-resistant container provided with a support member having an appropriate contact
area has not been realized.
[0011]
The present invention has been made in view of the above-mentioned circumstances, and while
securing the strength of the pressure container under water pressure while achieving downsizing
and weight reduction, it is easy to arrange and position the vibrator in the pressure container. An
object of the present invention is to provide a pressure-resistant container of a sensor that can
realize improvement in productivity and reliability.
[0012]
In order to solve the above problems, a first configuration of the present invention relates to a
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pressure-resistant container of a sensor housed with a plurality of transducers arranged, and a
node portion of the plurality of transducers and the pressure-resistant container A support
member fixed between the inner wall portion and the inner wall portion is characterized in that
the pressure-resistant container, the plurality of vibrators, and the support member are integrally
connected via the support member.
[0013]
According to the configuration of the present invention, the pressure-resistant container, the
support member, and the vibrator are integrally connected by the support member being fixed to
the node portion of the plurality of vibrators arranged inside the pressure-resistant container of
the sensor. Therefore, it is possible to secure the strength of the pressure resistant container
while reducing the size and weight of the pressure resistant container.
[0014]
BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the basic structure of the
acoustic sensor which is embodiment of this invention, (a) is a perspective view, (b) is a
longitudinal cross-sectional view which follows the arrow AA of (a).
It is a cross-sectional view which shows the structure of the same acoustic sensor which follows
an arrow BB line of Fig.1 (a).
It is a figure which shows the case where a hydraulic pressure is applied to the pressure
container of an acoustic sensor, (a) is a cross-sectional view which shows the deformation image
of a pressure container, (b) is a schematic diagram which shows bending and deflection of a
pressure container. is there.
It is a figure which shows the positioning structure of the vibrator | oscillator of an acoustic
sensor, (a) is a schematic diagram which shows arrangement | positioning and positioning
structure of a vibrator | oscillator, (b) is a cross which shows the positioning structure of the
vibrator at the time of assembly of an acoustic sensor. It is a front view. It is a schematic diagram
which shows the contact point of the vibrator | oscillator of an acoustic sensor, and a supporting
member. It is a perspective view which shows the example of the shape of a supporting member.
It is a cross-sectional view which shows the structure of the conventional acoustic sensor. It is a
figure which shows the case where a hydraulic pressure is applied to the pressure container of
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the conventional acoustic sensor, (a) is a cross-sectional view which shows the deformation
image of a pressure container, (b) is a model which shows bending and deflection of a pressure
container. FIG.
[0015]
The pressure resistant container according to the present invention is fixed to a side plate
member arranged at intervals on both sides of the plurality of vibrators along the arrangement
direction of the plurality of vibrators, and one end face of the side plate member. A support
member fixed between a back plate member, an elastic member fixed to the other end face of the
side plate member, a node portion of the plurality of transducers and an inner wall portion of the
side plate member of the pressure container The pressure-resistant container, the plurality of
vibrators, and the support member are integrally connected via the support member.
[0016]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
FIG. 1 is a view showing a basic structure of an acoustic sensor according to an embodiment of
the present invention, wherein (a) is a perspective view and (b) is a longitudinal sectional view
taken along the line A-A in (a). . Moreover, FIG. 2 is a cross-sectional view which follows the
arrow B-B line | wire of FIG. 1 (a) in an acoustic sensor. As shown in FIG. 1, in the acoustic sensor
21 of this embodiment, a plurality of transducers 23 are arranged at equal intervals in the
longitudinal direction inside the pressure resistant container 22, and the acoustic rubber 24 is
joined to the end face of the pressure resistant container 22. It is done.
[0017]
As shown in FIG. 2, the pressure-resistant container 22 includes a back plate 26 and side plates
27 a and 27 b. Each of the plurality of vibrators 23 is formed in an elongated prismatic shape,
and includes a rear mass 28, a piezoelectric material 29, and a front mass 30. The plurality of
transducers 23 are sandwiched between the acoustic rubber 24 and the back plate 24 with the
OS paper 25 interposed therebetween.
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[0018]
In the state where the plurality of transducers 23 are arranged inside the pressure resistant
container 22, the side plates 27 a and 27 b are positioned at predetermined intervals on both
sides of each of the transducers 23 along the arrangement direction of the transducers 23. . The
back plate 26 is fixed to one end face of the side plates 27a, 27b. The acoustic rubber 24 is fixed
to the other end face of the side plates 27a and 27b.
[0019]
Further, at the node portion of each vibrator 23, support members 34 are fixed symmetrically
with respect to the center line in the longitudinal direction of each vibrator 23. The support
member 34 is disposed between the node portion of each vibrator 23 and the inner wall portion
of the side plates 27 a and 27 b of the pressure resistant container 22. Since the support
members 34 are fixed to both sides of the node portion of each vibrator 23, the pressureresistant container 22, each vibrator 23, and the support member 34 are integrally connected via
the support member 34. Since the pressure container 22, the vibrators 23 and the support
member 34 are integrally connected, when the pressure sensor 22 is deformed by water
pressure when the acoustic sensor 21 is used underwater (including in the sea), high water
pressure It is possible to suppress the deformation of the pressure container 22 also in the
above. In this case, each vibrator 23 has a function as a strength member.
[0020]
FIG. 3 is a view showing a case where water pressure is applied to the pressure container of the
acoustic sensor, and FIG. 3 (a) is a cross sectional view showing a deformation image of the
pressure container, and FIG. 3 (b) is a pressure container. It is a schematic diagram which shows
the bending of a container, and a bending. As shown to Fig.3 (a), the case where the hydraulic
pressure 31 is applied to the both sides of the pressure | voltage resistant container 22 of an
acoustic sensor in the arrow direction is taken as an example. When the pressure resistant
container 22 is deformed by the water pressure 31, as described above, the support members 34
are fixed to both sides of the node portion of each vibrator 23, so the pressure resistant
container 22 and the support member 34 The respective vibrators 23 are integrally connected.
As a result, compressive stress is applied to each of the vibrators 23, so that deformation of the
pressure-resistant container 22 can be suppressed.
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[0021]
Further, as shown in FIG. 3B, the maximum deflection Ymax of the pressure resistant container
(side plate 27a or 27b) when the pressure resistant container 2 receives equal distribution load
(water pressure) ω is the pressure resistant container (side plate 27a or The length L between
the fulcrums of 27b), the modulus of longitudinal elasticity E, the moment of inertia of area Iz,
and the length of protrusion λ from the fulcrums of the pressure vessel (side plate 27a or 27b)
are expressed by the following formula be able to. When Ymax = (5ω · L <4> / 384E · Iz) + (ω ·
λ <2> · L <2> · E · Iz) L >> λ Ymax = 0.013X X = ω · L < 4> / E · Iz
[0022]
Here, when the pressure container 22 receives the water pressure 31, the supporting point 32
corresponding to the junction of the side plate 27a and the back plate 24 and the supporting
member 34 become a support, so that the deformation mode in the both end support beams
Deform.
[0023]
FIG. 4 is a view showing the positioning structure of the vibrator of the acoustic sensor, (a) is a
schematic view showing the arrangement and positioning structure of the vibrator, and (b) shows
the positioning of the vibrator at the time of assembly of the acoustic sensor. It is a crosssectional view which shows a structure.
Before each vibrator 23 is incorporated into the pressure-resistant container 22, as shown in FIG.
4A, each vibrator 23 is positioned in advance by attaching each vibrator 23 to one support
member 34. . Thereafter, when each vibrator 23 attached to the support member 34 is
incorporated into the inside of the pressure resistant container 22, the support member 34 is
abutted against the side plates 27 a and 27 b of the pressure resistant container 22. As a result,
the transducers 23 can be arranged together in a highly accurate manner inside the pressure
resistant container 22.
[0024]
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Further, by using the support member 34, the vibrator 23 can be incorporated at an arbitrary
position inside the pressure resistant container 22. As a result, as shown in FIG. 4B, the vibrator
23 is positioned inside the pressure-resistant container 22 at the time of assembly of the acoustic
sensor. The support member 34 has a function as an arrangement / positioning component for
arranging and positioning the transducers 23 inside the pressure resistant container 22.
[0025]
FIG. 5 is a schematic view showing a contact point between the vibrator of the acoustic sensor
and the support member. The supporting member 34 used for positioning the vibrator 23 is, as
shown in FIG. 5, a contact area of the contact portion 35 of the supporting member 34 with
respect to the node portion of the vibrator 23 in order to fix it in contact with the node portion of
the vibrator 23. It is necessary to make it as small as possible and to be able to withstand the
maximum water pressure in the use environment when using the acoustic sensor in water. If the
contact area of the contact portion 35 of the support member 34 with respect to the node
portion of the vibrator 23 is as small as possible, the influence on the acoustic performance of
the acoustic sensor is small. However, if the contact area is too small, it may exceed the allowable
yield strength (or fatigue stress) of the material of the vibrator 23 and the vibrator 23 may be
broken.
[0026]
Therefore, in order to minimize the contact area of the contact portion 35 of the support member
34 with the node portion of the vibrator 23 while preventing the breakage of the vibrator 23, the
formula for calculating the contact area can be considered as follows. . The example of
calculation of the contact area shown below is an example of the case where the vibrator 23 is
formed into a prismatic shape, and the concept is the same even when the vibrator is formed
into, for example, a cylindrical shape other than the prismatic shape.
[0027]
Under the water pressure 31 (maximum water pressure) received by the pressure resistant
container 22 in the use environment when the acoustic sensor is used underwater, Fmax is the
compressive load applied to the node portion of the vibrator 23 and a is a width of the vibrator
23 (length Constant) and the vertical width of the vibrator 23 is b. The contact area A of the
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contact portion 35 of the support member 34 with respect to the node portion of the vibrator 23
in this case can be expressed by the following equation. A = a × b That is, the contact area A can
be minimized by minimizing the length of the vertical width b of the vibrator 23.
[0028]
The compressive load Fmax applied to the node portion of the vibrator 23 under water pressure
31 (maximum water pressure) when the acoustic sensor is used in water is applied to the node
portion of the vibrator 23 from the pressure container 22 through the support member 34. The
contact point 35 (contact area A) of the support member 34 is loaded. The compressive stress σ
applied to the vibrator 23 at that time can be expressed by the following equation. Therefore, in
order to minimize the contact area A of the contact portion 35 of the support member 34 with
respect to the node portion of the vibrator 23, when the allowable strength (or fatigue stress) of
the material of the vibrator 23 is σs. The vertical width b of the vibrator 23 satisfying .sigma.s ≧
σ may be selected.
[0029]
Further, in the minimum contact area Amin when the contact area A of the contact portion 35 of
the support member 34 with respect to the node portion of the vibrator 23 is minimized, the
relationship between the tolerance strength σs and the compressive stress σ is represented by
σs = σ But consider safety factor if necessary. When the safety factor by design is considered,
and the safety factor is Sf, the compressive stress σ can be expressed by the following equation.
σ = (Fmax / A) × Sf
[0030]
The shape of the support member 34 is selected based on the contact area of the contact portion
35 of the support member 34 with the node portion of the vibrator 23 obtained by the method
described above. In this embodiment, the shape of the support member 34 is prismatic, but the
shape is not limited to this, and various shapes as shown in FIG. 6 can be considered.
[0031]
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FIG. 6 is a perspective view showing an example of the shape of the support member. As shown
in FIG. 6, as the shape of the support member, a plate shape, a trapezoidal shape, an L-shape, etc.
can be considered other than the prismatic shape of this embodiment. Further, as a material used
for the support member, an elastic material is preferable, and specific examples thereof include
composite materials such as carbon fiber reinforced plastics (CFRP), resin materials such as
rubber, and cork.
[0032]
According to this embodiment, the following effects can be obtained. The first effect is that the
plurality of transducers 23 arranged inside the pressure-resistant container 22 of the acoustic
sensor is fixed to the node portion with the support member 34, thereby supporting the
pressure-resistant container 22 via the support member 34. The member 34 and the vibrator 23
are integrally connected. For this reason, it is possible to provide an acoustic sensor capable of
securing the strength (rigidity) of the pressure-resistant container 22 while reducing the size and
weight of the pressure-resistant container 22. The reason is that each vibrator 23 inside the
pressure resistant container 22 is considered as a strength member, and a support member 34
having an appropriate contact area is fixed to the node portion of each vibrator 23. For this
reason, when using the acoustic sensor 21 in water or under water when the water pressure 31
is received on both sides of the pressure container 22 as shown in FIG. 3, the pressure container
22 is supported by the fulcrum 32 and the support member 34. , It deforms by the deformation
mode in the both end support beam. When the deformation mode in the both-ends supporting
beam of the pressure container 22 of this embodiment is compared with the deformation mode
in the cantilever shown in FIG. 8A of the conventional structure, the maximum deflection is 1/10
and the maximum deflection occurs. Different sites. However, the calculation formula shown in
FIG. 3B of this embodiment and the calculation formula shown in FIG. 8B of the conventional
structure are calculation formulas of deflection when receiving an equally distributed load. Ymax:
Maximum deflection of the pressure vessel, ω: Water pressure (uniform distribution load), L:
Length between fulcrums of the pressure vessel E: Longitudinal elastic modulus, Iz: Second
moment of section, λ: Spring from the fulcrum The length is assumed to be very small for a
simple comparison of the two, and considered to be the same as the length of L in FIG. 8 (b).
[0033]
The second effect is to improve the assemblability of the acoustic sensor, the mechanical
positioning accuracy, the quality, and the productivity and reliability by using the support
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member 34 as a component for arranging and positioning the vibrator 23. It can be realized. The
reason is that, as shown in FIG. 4A, the support member 34 is used as an arrangement /
positioning component to arrange and position the plurality of vibrators 23, whereby each
vibrator 23 is incorporated into the pressure-resistant container 22. The arrangement can be
made with high accuracy, and each vibrator 23 can be reliably fixed at a desired position inside
the pressure resistant container when the vibrators 23 are incorporated into the pressure
resistant container 22.
[0034]
The third effect is to obtain the contact area between the vibrator 23 and the support member
34, and to determine the shape of the support member 34, in other words, by selecting a support
member having a shape suitable for the use environment of the acoustic sensor, It is possible to
realize an acoustic sensor in which the influence of sensor performance and mechanical
characteristics on the acoustic influence is minimized. The reason is that although the contact
between the node part of the vibrator and the support member is ideally a point or a line,
practically it is difficult to secure the material strength of the vibrator, so the pressure container
in the usage environment of the acoustic sensor Determine the appropriate contact area from the
maximum water pressure applied to the load and the allowable load capacity (or fatigue stress) of
the vibrator. This makes it possible to select the shape of the support member that has minimal
impact on acoustic performance.
[0035]
Although one embodiment of the present invention has been described in detail with reference to
the drawings, the specific configuration is not limited to this embodiment, and there are changes
in design and the like within the scope of the present invention. Even within the scope of this
invention. In the above-described embodiment, as a structure for fixing the vibrator 23, as shown
in FIG. 3A, the structure for fixing the supporting point 32 of the vibrator 23 and the node
portion of the vibrator 23 by the support member 34 is exemplified. Not limited to this. For
example, the present invention can be applied to a structure in which the vibrator 23 is fixed
only by the support member 34 and a structure in which a plurality of node portions of the
vibrator 23 are connected.
[0036]
The pressure resistant container of the present invention is not limited to the application to a
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pressure resistant container containing a vibrator and an acoustic sensor made of acoustic
rubber, and can be applied to applications such as other sensors including a pressure resistant
container containing a vibrator.
[0037]
21 acoustic sensor (sensor) 22 pressure container 23 vibrator 24 acoustic rubber (elastic
member) 26 back plate (back plate member) 27a, 27b side plate (side plate member) 31 water
pressure 32 fulcrum 34 support member 35 contact point
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