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JPS621399

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DESCRIPTION JPS621399
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic circuit for underwater acoustic transducers used to impart low-frequency acoustic filter
characteristics to a deep-depth electroacoustic transducer used in water. [Prior Art] As a prior art,
there is an acoustic circuit for high frequency depth. FIG. 6 is a cross-sectional view showing an
example of a conventional high frequency / depth sound circuit. This is because, as shown in FIG.
6, the inner surface of the vibrator 24 for converting electricity f4 # is covered with the support
columns 25 and 7 runes 26 and 28 and the through holes 26 af are provided in the 7 runes 26.
The structure is In this type of acoustic circuit, the acoustic inertance is indicated by the pores of
the metal tube 27 in the through hole 26a, and the acoustic compliance is indicated by the
vibrator 24. An acoustic filter is formed by a cavity surrounded by pillars 25 and 7 and flanges
26 and 28, and basically a high frequency frequency cutoff and low frequency all pass through
filter ?, for example, the cross sectional area of the through hole 26a S. Length 24. Assuming
that the volume of the cavity is ?, and the propagation medium of the sound wave filled in each
interior, generally p is the specific gravity of the acoustic oil and C is the acoustic velocity, the
acoustic inertance LA and the acoustic compliance CA are as follows (7) 11), (2) Express as
follows. When the sound pressure of the acoustic system and the particle velocity correspond to
the voltage and current of the electrical system, respectively, the acoustic inertance LA and the
acoustic compliance CA correspond to the inductive inductance and capacitance of the electrical
system, respectively. The equivalent circuit is as shown in FIG. From the equivalent circuit of FIG.
7, this acoustic filter has a cut-off frequency fc shown in equation (3), a sound wave of a
frequency higher than the cut-off frequency is cut off by this acoustic circuit, and a sound wave
of a frequency lower than the cut-off frequency is this acoustic circuit Pass through. At the cutoff
frequency fC, ?A? constitutes a resonant system consisting of an acoustic inertance LA and an
acoustic co / pactor C, and the amplitude expansion ratio of this resonance, ie, acoustic Q,
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represents the acoustic resistance due to the viscous resistance of the propagation medium of
acoustic waves as RA. The following relationship (shown in the fourth part formula) и и и и и и и (4)
The transmission ratio P z / P 1 between the external sound pressure P and the internal sound
pressure P of the above-mentioned acoustic circuit is as shown in FIG. A). When the acoustic Q is
high, the resonance characteristic is sharp as in the actual recording, and when the acoustic Q is
low, the resonance characteristic is slow as shown by a dotted line. The oscillator 24 outputs the
signal voltage v8 based on the sound pressure difference between the sound pressure P received
directly from the outside and the sound pressure P transmitted to the inside through the acoustic
circuit, so that it has characteristics as shown in FIG. 81b). When the acoustic Q is high, the
signal voltage of L changes largely like a laugh line, and when the acoustic Q is low, the change is
small as dotted line.
By using the acoustic circuit in this way, by making the operating frequency band higher than the
cut-off frequency fc, various signal voltages proportional to the external sound pressure P can be
obtained and various types including hydrostatic pressure of a frequency sufficiently lower than
the cut-off frequency fc. With respect to dynamic pressure, the pressure inside and outside of the
vibrator 22 becomes equal to prevent mechanical damage of the vibrator 24. [Problems to be
Solved by the Invention] However, the following problems basically exist in this kind of acoustic
circuit. Assuming that the cutoff frequency is I KHz (D high frequency acoustic circuit, for
example, the volume of the cavity is, for example, 1 oo Crn3. Assuming that the cross-sectional
area of the bushing 25 is 11 mm, the length of the metal tube when filled with the acoustic oil is
about ? 57 mm, and it can be made of seven through holes. However, the length of the metal
tube of the low frequency acoustic circuit in which only the cut-off frequency is lowered to 10 Hz
in the above-mentioned specifications is as extremely long as about 5.7 m. With such a long
metal pipe, even if it is wound in a screw-like manner, it can not be wound with a small curvature
to prevent crushing of the inner diameter, and it has the disadvantage of being difficult to form a
large winding, bending size, and processability. In addition, when the volume of the cavity is
made constant and the cutoff frequency is lowered, the acoustic Q becomes high as apparent
from the equation (4), and the frequency characteristic of the signal voltage, that is, the receiving
sensitivity-frequency characteristic of the acoustic converter. It also has the disadvantage of
giving steep changes. In the above example, the acoustic Q at the cutoff frequency of 10 Hz is
100 times the acoustic QO at the cutoff frequency IKHz. Another object of the present invention
is to provide an acoustic circuit for underwater acoustic transducers which eliminates the abovementioned drawbacks and does not require a large metal tube. [Means for Solving the Problems]
The acoustic circuit of the present invention has an acoustic filter characteristic to be set by
means of an apertured metal tube provided so as to project from the inside of the seal of the
transducer of the underwater acoustic transducer into the acoustic field. In the acoustic circuit
for underwater acoustic transducer to be applied to the above-mentioned underwater acoustic
transducer, a groove having a continuous linear shape and a length with a predetermined shape
is used to form the following plural elastic bodies directly or through a support structure. The
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groove is connected to be connected, and in this case, the coupling includes acoustic filter
characterization means for forming an acoustic path equivalent to the acoustic path of the
apertured metal tube and imparting a predetermined acoustic filter characteristic. Next, the
present invention will be described in detail with reference to the drawings. FIG. 1 shows the
underwater sound utilizing the acoustic circuit of the present invention, and the acoustic circuit 3
and the acoustic circuit 4 and the diaphragm 7 are attached to the upper and lower sides of the
body 2 as a fixture 6.
A series of paths from the through hole 2a of the pore surface body 2 providing the acoustic
inertance to the groove 3b and the through hole 3a of the acoustic circuit 3 and the groove 4b of
the acoustic circuit 4 and the through hole 4a The acoustic oil 8 is filled up to the inner side of
the inner collar diaphragm 7 of the tooth body 2. The acoustic circuits 3 and 4 have continuous
grooves provided on a disc or other elastic body having a preset shape, and the shape thereof is,
for example, a sine wave or a spiral shape, and any other material is selected. It can be used. The
purpose of this groove is to seal this groove by some means and use it as an acoustic path similar
to a thin tube of a metal tube, so it is optional on the premise that its cross-sectional area and
length match the purpose of use The thing of the shape of can be utilized. In the case of FIG. M1,
a series of paths including the through hole 42 from the joint portion with the through hole 2a
are fixed by closely attaching the disk-like acoustic circuits 3 and 4 having such grooves in a
laminated manner. It will function equivalent to a metal tube with a long length. When the
underwater acoustic transducer shown in FIG. 1 enters the sound field, the acoustic wave drives
the outer surface of the vibrator 1 and at the same time, through the diaphragm 7 on the belly
side, the through holes 4a and 3a of the acoustic circuit 4.3 The acoustic filter composed of the
acoustic inertance by the pores and the acoustic compliance in the casing before the sound wave
coming through the grooves 4b and 3b and the through hole 2af of the eyelid 2 but having a
cutoff frequency or more reaches the back of the oscillator l It attenuates and has no influence
on the driving force from the outer surface of the vibrator l, so that the vibrator l performs the
acousto-electrical conversion corresponding to only the vibrational force from the outer surface.
In addition, changes in hydrostatic pressure, etc. sufficiently lower than the continuous frequency
do not cause the damping of the acoustic filter, so that the same pressure change is applied to
the outer surface and the back surface of the vibrator l, resulting in mechanical protection of the
vibrator l. . In the acoustic circuit of FIG. 1, the acoustic circuit 3 is a first elastic body, and the
acoustic circuit 4 is a second elastic body, and these two elastic bodies are in close contact with
each other and laminated. The second embodiment is also included. FIG. 2 is a cross-sectional
view showing the third and fourth embodiments of the present invention together. A cylindrical
vibrator 9 is supported by the support 10 and the acoustic circuits 11 and 7 ') 12 and 13, and
the 2 rungs 13 are further provided with an acoustic circuit 14. The acoustic circuits 11 and 14
in FIG. Using the acoustic circuit according to the fourth embodiment of the present invention in
which a threaded groove is provided on the circumference of a cylinder, between the support
columns 10 and 12 and 13 of the joint to cover this groove and the flange 12 Between the metal
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cap 16 and the cap 16 for better adhesion t metal packaging y 17 a, 17 b, 17 c, 17 d.
176 are swallowed. A large recess is provided inside the acoustic circuit 14 to give it the
character of acoustic compliance. In the configuration of FIG. 2, acoustic compliance is created
between the vibrator 9 and the support column lO, and is connected to the acoustic inertance
provided by the through holes 10a of the support column, the grooves 11b of the acoustic circuit
and the pores of the through holes 11a, It is connected to the acoustic compliance created
between the flange 12 and the cap 16 via the flange 120 through hole 12 at ? ?. Furthermore,
through the acoustic inertia between the acoustic circuit 11 (the DX through holes 11 a ? and
the through holes 13 a of the 7 flange 13 through the acoustic compliance between the acoustic
circuit 14 and the flange 13 through the acoustic inertance, the grooves 14 b of the acoustic
circuit 14 and the through holes 14 a Acoustic oil 8 is filled in the path from the inside of the
diaphragm 19 fixed by the fixture 15 to the external sound field by the acoustic inertance to the
vibrator 9. The acoustic compliance group and the acoustic inertance group configured in FIG. 2
also operate as an acoustic filter as in FIG. 1 @ FIG. 3 is a plan view showing the structure of the
fourth embodiment of the present invention, and FIG. It is a top view which shows the structure
of the 5th Example of this invention. FIG. 3 shows an acoustic circuit in which a spiral groove
20b and a through hole 20m are provided at one end of the disk-like elastic body 20, and FIG. 4
is a disk-like elastic. An acoustic circuit having an acoustic circuit having a groove 21b connected
in a single circle while turning alternately concentrically and alternately on the plane of the body
21 and the through hole 21a provided at one end of the groove 1 can be effectively used in the
same or different combinations as the acoustic circuits 3 and 4 in the uninvented second
embodiment shown together with FIG. 5: FIG. 5 is a partial structural view showing the 70th
embodiment of the present invention It is. In the seventh embodiment shown in FIG. 5, the
through portion 22t of the magnetic body is provided in the through hole 13a of the 7 runge 13
of FIG. 2, and the through portion is filled with the magnetic fluid 23t. By making the structure
like this, the acoustic inertance of this portion is increased by the suction force between the
penetrating portion 22 and the magnetic fluid 23, and the conductive material tube is selected
for the penetrating portion 22. It can provide acoustic resistance due to eddy current losses. The
structure shown in FIG. 5 can lower the acoustic Qt of the acoustic inertance, and slow the
characteristic change at the high cutoff frequency of the acoustic filter. As a result, the acoustic
transducer has a smooth receiving sensitivity-frequency characteristic. give. This magnetic fluid
21 works as described above for the minute sound waves of the signal, but it is also possible to
use a pressure 9 that exceeds the sealing force of the magnetic fluid 23, such as a change in
hydrostatic pressure or a change in volume of acoustic oil due to a change in temperature. Once
the seal by the magnetic fluid 21 is broken and the pressure disappears, the properties of the
magnetic fluid return to its original state. Even if it is used for part or all of the depressions, the
effect is good, and furthermore, by mixing conductive powder or hollow spheres with the
magnetic fluid, the acoustic resistance can be increased.
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These can be easily implemented as the eighth and ninth embodiments of the present invention,
respectively. As described above, according to the present invention, a low frequency acoustic
filter can be configured in a small size with good processability by closely laminating an elastic
body having dense grooves and through holes. I can see the effect I can do. Furthermore, an
acoustic circuit for an underwater sound converter is easily realized, which easily adjusts the
characteristics of the acoustic filter, by integrating a large number of 9 acoustic circuits having
so-called acoustic elements such as acoustic compliance, acoustic inertance, and acoustic
resistance by magnetic fluid in layers. The effect of being able to
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing the first and second embodiments of the present
invention, and FIG. 2 is a cross-sectional view showing the third and fourth embodiments of the
present invention. 5 is a plan view showing a fifth embodiment of the present invention, FIG. 4 is
a plan view showing an embodiment of tX 6 according to the present invention, and FIG. 5 is a
partial sectional view showing a seventh embodiment of the present invention. 7 is a crosssectional view showing an example of a conventional high frequency / depth sound circuit, FIG. 7
is an electrical equivalent circuit of the sound circuit shown in FIG. 6, FIG. 8 (a) is a sound shown
in FIG. The resonance characteristic diagram of the circuit, and FIG. 8 (b) is a diagram of the
vibrator thread force signal voltage characteristic diagram of the acoustic circuit shown in FIG.
l ...... vibrator, 2 ...... appointed body, 2a ...... through-hole, 3 ...... acoustic circuit, 3a ...... through
hole и и и и и и и и и и и и и и и и и и и и и и и и и и Acoustic circuit, 4a и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и fixtures ,
7ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и 10% post through hole, 11 ...... acoustic circuit, lla, iia '...... through hole, 11b ...... groove,
12.13 ...... 7 lunge, 12a, 13m и и и и ... through hole, 14 ...... acoustic circuit, 14a ...... through hole
14b ...... groove, 15 ...... fixture 16 ..... и Caps 17a to 17e и и и и и и и и и metal patzkin, 9................ иииии
Elastic body, 21a иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Magnetic
flow material, 24 ииии
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииии Through hole, 27 ииииии Metal pipe, 28 иии иии 7 Runs ?) ?? 2. No difference 1 time leather
3 figure ? 4 figure $ 8 (L) TM
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