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JPH10285682

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Notice
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 JPH10285682
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
underwater transducer used as a flextensional sound source or the like in water.
[0002]
2. Description of the Related Art In the field of underwater transducers, a flextensional type is
widely used recently, for example, it is used as a flextensional sound source (transmitter). The
drive element is coupled to the outer frame usually called a shell, and the expansion and
contraction of the drive element is converted to the bending displacement of the shell to obtain a
larger displacement amount, instead of reflecting the is there.
[0003]
FIG. 6 is a view showing a conventional underwater transducer, in which (a) is a plan view and (b)
is a front view.
In the figure, reference numeral 11 denotes a shell having an elliptical planar shape, 12 denotes
a driving element supported in the shell 11, 13 denotes a plate, and 14 denotes a support. In a
flextensional sound source, a large sound output exceeding the frame of the displacement
amount of the drive element 12 can be obtained, but as a measure to further increase the sound
output, the shells 11 supporting the drive element 2 are stacked in multiple stages. An arraying
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structure is employed.
[0004]
Moreover, the plate material 13 is arranged so as to block the upper and lower opening faces of
the shell 11 stacked in a plurality of stages, in view of use in water, Both upper and lower end
portions of the pillars 14 of the book are made to penetrate through both the plate members 13,
and the shell 11 is clamped and fixed by the plate members 13 from above and below by using
the columns 14. Furthermore, water is kept between the shells 11 and between the shells 11 and
the plate 14 by O-rings or a rubber material.
[0005]
Moreover, when using by towing by a ship etc., arrange ¦ positioning the support ¦ pillar 14
inside the shell 11 non-contactingly is also performed.
FIG. 7 shows the action of the underwater transducer as a flextensional sound source. As seen in
this figure, in the case of a flextensional sound source, the longitudinal expansion and
contraction of the drive element 12 is transmitted to the shell 11; The shell 11 converts it into a
large bending displacement and outputs it as an acoustic.
[0006]
However, in the prior art described above, the support is disposed at a position away from the
shell, and the shell is held in position by holding the shell from above and below, thereby
maintaining the position of the shell. Because of this, if the tightening force on the shell is too
strong, the stiffness (elastic modulus) of the shell will increase and the characteristics will
change.
[0007]
Therefore, it is necessary to specify the amount of tightening within a specific range, but in that
case, if the tightening is weak, if you tow, tilt, or turn the air sideways during transport, the shell
will shift due to its own weight. There is a problem of
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In order to prevent such displacement, in order to obtain a support structure that can support
the shell's own weight, it is only necessary to contact the shell with a rigid member separately
from the support, which prevents movement of the shell during driving. In the non-contact
structure where the property does not change, or the structure which is insufficient in load
resistance, an array or a large shell is When used, it becomes unreliable.
[0008]
In addition, when the columns are arranged at a distant position on the outside of the shell, there
is a problem that it is necessary to design to secure the space for that much, and there is a
problem that the space for arranging the columns becomes large. In the case of arranging in the
space between the drive element supported inside the shell and the shell, a space for a support is
provided, or a plurality of drive elements are connected laterally and the connection portion is
also used as a support And the like, and there is a problem that the dimensions of the drive
element are restricted.
[0009]
Therefore, an object of the present invention is to realize an underwater transmitter-receiver that
can solve these problems.
[0010]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, plate members are disposed so as to close the upper and lower openings of a shell
supporting a drive element inside, and the upper and lower plate members are provided In an
underwater transmitter-receiver in which the shell is clamped from above and below with the
plate material using the support, a plurality of fixed points existing at the time of bending
displacement of the shell by extension and contraction of the drive element and the vicinity of
each fixed point The plate member is provided with a support member positioned at any one of
the above positions, and the shell is supported by the support member.
[0011]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the underwater
transmitter-receiver according to the present invention will be described below with reference to
the drawings.
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FIG. 1 is a view showing a first embodiment of the present invention, in which (a) is a plan view
and (b) is a front view.
[0012]
In the figure, reference numeral 1 denotes a shell having an elliptical planar shape, 2 a driving
element supported in the shell 1, 3 a plate member, and 4 a support.
This embodiment shows an example of using it as a flextensional sound source (wave
transmitter) in water, and adopts a structure in which the shells 1 supporting the drive element 2
are stacked in multiple stages to form an array. The shell 1 of is supported as follows.
[0013]
FIG. 2 is an explanatory view of a fixed point in the shell 1.
When a flextensional type underwater transducer is used as, for example, a transmitter, the
expansion and contraction of the drive element 2 is converted to the bending displacement of the
shell 1, but in the expansion and bending displacement, it hardly deforms when viewed from the
outside A fixed point having a very small amount of displacement, ie, a displacement amount,
exists in the shell 1.
[0014]
The present invention focuses on this point, determines the fixed point in the shell 1 and
arranges the support 4 in the vicinity of the fixed point or fixed point, and the recent finite of the
position of the fixed point in the shell 1 It can be predicted and determined by element method
analysis or the like. FIG. 2 shows an example in which four fixed points 5 are determined by
prediction by finite element method analysis or the like in the shell 2 whose plane shape is an
elliptical shape.
[0015]
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In the first embodiment shown in FIG. 1, in the shell 1 formed by stacking in multiple stages,
through holes are made at four fixed points 5 determined by finite element analysis or the like,
and the respective through holes are formed. The support 4 is inserted through the support 4
and the plate 3 is disposed so as to close the upper and lower opening faces of the array of the
shell 1. The shell 1 is clamped and fixed so as to be held between the upper and lower sides by
the plate 3 by using the plate 3.
[0016]
In addition, between the shells 1 and between the shell 1 and the plate 4, the watertightness is
maintained by using an O-ring or a rubber material as in the prior art.
FIG. 3 is a view showing the second embodiment, and FIG. 3 (a) is a plan view and FIG. 3 (b) is a
front view. In this embodiment, a support 4 is disposed in the vicinity of the fixed point of the
shell 1 as a support material, and the other configuration is the same as that of the first
embodiment.
[0017]
FIG. 4 shows the third embodiment, and FIG. 4 (a) is a plan view and FIG. 4 (b) is a front view. In
this embodiment, a support 4 is disposed in the vicinity of the fixed point of the shell 1 as a
support material, and the other configuration is the same as that of the first embodiment. Fig. 5 is
a view showing an application example to shells 1 of various shapes, and Fig. 5 (a) is a case
where the plane shape is applied to the thread-wound shell 1, Fig. 5 (b) bulging both ends
outward and rounding When applying to the shell 1 having a flat shape in which the central
portion is curved inward, the same figure (c) has a flat shape in which the central portion is
curved outward, and both ends are the driving element 2 In the case where the present invention
is applied to a pair of shells 1 joined to the both ends of FIG. 6D, the figure (d) has a planar shape
in which the central part is curved inward and two sheets joined to both ends of the drive
element 2. When applied to one set of shells 1, FIG. 6E shows the case applied to the shell 1 in
which the plane shape is substantially rhombic and the drive element 2 is supported in a
cruciform inside.
[0018]
In each of these shells 2, as in the embodiment shown in FIG. 1, through holes are made in fixed
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point 5, columns 4 are passed as support members in the respective through holes, and an array
of shells 1 is further provided. The upper and lower ends of the support 4 are made to penetrate
both plate materials 13 with the plate material 3 arranged to close the upper and lower opening
faces, and the shell 1 is sandwiched by the plate material 3 from the upper and lower sides In the
embodiment shown in FIG. 3, the support 2 may be circumscribed at a position near the fixed
point of the shell 2 as in the embodiment shown in FIG. As in the embodiment, the support 2 may
be inscribed at a position near the fixed point of the shell 2.
[0019]
When the underwater transducer according to the above configuration is used as a flextensional
sound source, for example, the expansion and contraction in the long axis direction of the drive
element 2 is transmitted to the shell 1, converted into a large bending displacement by the shell
1, and output as sound. .
Normally, in this type of sound source, the contact of the support 4 with the shell 1 hinders the
displacement of the shell 1, but as described above, in the embodiment of the present invention,
the support 4 is the fixed point of the shell 1. Or in the vicinity of the fixed point, so that when
driving as a sound source, the interference with the friction or displacement generated between
the shell 1 and the support becomes very small. Performance can be secured.
[0020]
In each of the above-described embodiments, the underwater transmitter-receiver in which the
shells 1 are stacked in three stages and arrayed is illustrated and described, but the present
invention is not limited to this, a plurality of stages other than three stages Alternatively, the
plate members 4 may be provided on the upper and lower sides of the single shell 1 and the shell
4 may be tightened by the plate members 4 by the support 4. Further, in each of the
embodiments described above, by providing a vibration absorbing material such as rubber on
each support 4, it is possible to reduce the impact between the shell 1 and each support 4.
[0021]
In each of the above-described embodiments, the shell 1 and each column 4 are processed to
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reduce friction so that the shell 1 and each column 4 have a bearing structure or a rolling
structure. Can be done more smoothly. In addition to the fixed point of the shell 1 or in the
vicinity of the fixed point, the support columns 4 may be present at other places in order to
obtain the required strength and the like as an underwater transducer.
[0022]
In addition to the above, the following embodiments can be considered. That is, according to the
present invention, the plate members 3 are disposed so as to close the upper and lower openings
of the shell 1 supporting the drive element 2 inside, the upper and lower plate members 3
penetrate both ends of the support 4 and A structure is adopted in which the shell is fastened
with the plate material from above and below, but the support 4 is used to fasten the shell with
the plate material 3 from above and below, and a rod-like body having a length equal to the
length of the shell 1 in the vertical direction The rod-like body may be passed between the upper
and lower plate members 3 so as to be positioned at or near the fixed point of the shell 1, and the
shell 1 may be supported by the rod-like body. A pin shorter than the length in the vertical
direction may be used as a support, and the pin may be provided on the plate 3 so as to be
located at or near the fixed point of the shell 1 and the shell may be supported by the pin.
[0023]
Further, although the present invention has been described for use as a flextensional sound
source, that is, a transmitter, the external sound wave is received by the shell 1 and its vibration
is transmitted to the drive element 2 to take out an electric signal. Of course, it can also be used
as a receiver.
[0024]
As described above, according to the present invention, the plate members are disposed so as to
close the upper and lower openings of the shell supporting the drive element inside, and the
upper and lower plate members penetrate both ends of the column. In an underwater
transmitter-receiver in which the shell is clamped from above and below with the plate material
using the support, any one of a plurality of fixed points existing at the time of bending
displacement of the shell due to expansion and contraction of the drive element and a position
near each fixed point Since the support member positioned on one side is provided on the plate
member and the shell is supported by the support member, the shell can always be located
without increasing the clamping force on the shell and substantially preventing the displacement
of the shell. It is possible to support the position of the period, so that it is possible to prevent the
displacement of the shell without deteriorating the characteristics of the underwater transducer.
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It is.
[0025]
In addition, since the support material contacts and supports the shell, the shell can be prevented
from shifting due to its own weight even when towing, tilting, or turning sideways during
transportation in the air, and stable performance can be achieved. The effect of being able to
maintain is also obtained.
In addition, when the column is used as a supporting material, since the column is disposed at a
position near or near a plurality of fixed points existing at the time of bending displacement of
the shell, a space for arranging the column is required. Since the shell can be reliably supported
without increasing the size and without increasing the tightening force to the shell, the plate
material can be made of a soft material, and performance improvement and weight reduction can
be expected.
[0026]
In addition, even when the post is disposed inside the shell, the post is disposed in the shell in the
vicinity of the fixed point of the shell, so that there is no effect that the dimensions of the drive
element are restricted. .
Furthermore, even when using a large shell, if the support material is selected according to the
weight, the shell will not be displaced, and deterioration of the property can be prevented.
[0027]
Brief description of the drawings
[0028]
1 is a diagram showing a first embodiment of the present invention.
[0029]
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2 is an explanatory view of a fixed point in the shell.
[0030]
3 is a diagram showing a second embodiment of the present invention.
[0031]
4 is a diagram showing a third embodiment of the present invention.
[0032]
5 is a diagram showing an example of application of the invention to shells of various shapes.
[0033]
6 is a diagram showing the prior art.
[0034]
7 is a diagram showing the operation of the prior art.
[0035]
Explanation of sign
[0036]
1 shell 2 driving element 3 plate 4 support 5 fixed point
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