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JPH10200985

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH10200985
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
submersible wave transmitter, and more particularly to a submersible wave transmitter having
water pressure characteristics capable of stabilizing the wave transmitter characteristics over a
wide range of use depths. It is.
[0002]
2. Description of the Related Art For example, in the underwater transmitter disclosed at the
Marine Acoustics Society of Japan in September 1993 (The 3rd workshop course of the Ocean
Acoustics Society, oscillator material and handset, handset compilation), the driving element is Is
expanded and contracted in the axial direction of the cylinder, the stretching stress is transmitted
to the tail mass and the head mass, and the sound pressure is radiated from the head mass into
the water.
[0003]
When the underwater transmitter receives water pressure, the head mass is pushed toward the
inside of the underwater transmitter, and the head mass, the drive element, and the tail mass
move together in an inward direction.
Therefore, a decoupling material is disposed between the cylinder and the head mass so as to
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withstand the water pressure. As this decoupling material, a rubber-based material that is soft
and can withstand until the water pressure reaches a target usage depth is used.
[0004]
In the underwater wave transmitter configured as described above, the decoupling material
elastically deforms when the working depth changes and the water pressure changes, and its
hardness (stiffness) changes. Since the characteristics of the underwater wave transmitter change
with the accompanying increase in stiffness, whether the change in stiffness is used at a very
shallow depth, the condition of use depth is almost constant, or the characteristics of the
underwater wave transmitter However, practical use was not possible for applications where
practical use is possible, a wide range of depth of use, and stable performance are required.
[0005]
The present invention has been made to solve the above problems, and the characteristics of the
underwater transmitter do not change even if the depth of use changes, and the transmitter
characteristics are stable over a wider depth of use. It is an object of the present invention to
obtain an underwater wave transmitter having a water pressure resistant structure that can be
[0006]
SUMMARY OF THE INVENTION (1) In the underwater wave transmitter according to the present
invention, a spring having a constant spring constant is disposed in a water pressure receiving
portion in order to suppress a characteristic change due to an operation depth. .
(2) Moreover, the spring of said (1) was comprised with the disc spring.
[0007]
(3) Moreover, the spring of said (1) was comprised with the coiled spring. (4) Furthermore, a
plurality of springs of the above (1) were disposed in parallel, or a plurality of springs were
disposed in series.
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[0008]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a first
embodiment of the present invention. A solid, water-tight cylinder 1 constitutes an outer shell of
the underwater wave transmitter, and is formed of a substantially cylindrical metal having an
opening 1a on one side and air 2 inside. In the vicinity of the opening 1 a of the cylinder 1, a
water pressure receiving portion 3 whose diameter is enlarged is formed. A head mass 4 emits
sound pressure into water, which is made of a lightweight and rigid material to enhance acoustic
radiation efficiency, is attached to the opening 1 a of the cylinder 1 and is axially oriented (in the
X and Y directions) of the cylinder 1 Move to
[0009]
A tail mass 5 can freely vibrate in the axial direction (X-Y direction) of the cylinder 1 within the
air two-layer of the cylinder 1 in order to reduce the acoustic radiation power inside the cylinder
1 as much as possible. The driving element (electro-mechanical conversion element) 6 has both
ends in contact with the head mass 4 and the tail mass 5, and the two layers of air expand and
contract in the axial direction (X-Y direction) of the cylinder 1 It is transmitted to the tail mass 5
and the head mass 4.
[0010]
A spring 7 is disposed in the water pressure receiving portion 3 of the cylinder 1 for water
pressure resistance, and is provided between the head mass 4 and the cylinder 1 to support the
head mass 4. The spring 7 is a ring-shaped disc spring, and receives pressure from the head mass
4 when it receives water pressure in the direction of arrow a. And for the deflection, it has a
certain hardness (stiffness or spring constant) to minimize the change in the transmitter
characteristics with respect to the operating depth. The corresponding range is from shallow
depth, which is approximately natural length, to depth reaching the deflection limit of the spring.
[0011]
That is, since the hardness of the spring 7 consisting of the disc spring is substantially constant
within the allowable range, the transmitter performance changes when the deflection of the
spring is within the allowable range even if the depth changes. It will not do.
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[0012]
The spring constant of the spring 7 is clearly defined as a nominal value. Therefore, by designing
the spring constant, the transmitter can be designed according to the desired operating depth
and depth change range. The transmitter performance can be kept constant within the permitted
depth range, ie up to the water pressure corresponding to the deflection limit of the spring.
[0013]
The operation of the present embodiment configured as described above will be described.
The driving element 6 is in the air 2 layer, and expands and contracts in the axial direction (X-Y
direction) of the cylinder 1.
The expansion and contraction are transmitted to the tail mass 5 and the head mass 4 and
emitted as sound pressure from the head mass 4 into water.
[0014]
By the way, when the underwater transmitter is in the water, it receives the water pressure, but
the water pressure increases as the depth increases. At this time, since the cylinder 1 does not
move, the head mass 4 is pushed in the inward direction of the underwater wave transmitter,
that is, in the direction of the arrow a as the water pressure increases. Move to For this reason,
the pressure applied to the head mass 4 causes the spring 7 disposed in the water pressure
receiving portion 3 to deflect under pressure, thereby exhibiting a water pressure resistant
function. The corresponding range is from shallow depth which is approximately natural length
to depth reaching the deflection limit of the spring.
[0015]
By the way, since the hardness of the spring 7 is almost constant in the allowable range, the
stiffness does not change due to the elastic deformation within the above corresponding range,
and the stiffness does not increase. The characteristics do not change.
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[0016]
According to the present embodiment, in the underwater wave transmitter, the water pressure
receiving portion 3 between the head mass 4 and the cylinder 1 is provided with the spring 7
having a constant spring constant with respect to deflection as a water pressure resistant
structure. The design taking into account the constant can keep the transmitter performance
constant within the range of water pressure corresponding to the deflection limit of the spring.
Thus, even if the operating depth of the underwater transmitter changes, the transmitter
characteristics can be stabilized at a wider operating depth without changing the characteristics
of the underwater transmitter. Moreover, since there are many general industrial springs about
the kind of spring 7, a transmitter design is easy according to the operation | movement depth
made into the objective and the depth change range.
[0017]
Embodiment 2 FIG. 2 is an explanatory view of Embodiment 2 of the present invention. In the
present embodiment, a plurality of coil springs 8 are used in place of the disc springs in the
spring disposed in the water pressure receiving portion 3. According to the present embodiment,
in addition to the effects of the first embodiment described above, the cost can be reduced
because the coil spring 8 is cheaper than a disc spring, and the selection range is large because
the size, spring constant, etc. are abundant. The effect such as wide can be obtained.
[0018]
Embodiment 3 FIG. 3 is an explanatory view of Embodiment 3 of the present invention. In this
embodiment, disc springs 7a and 7b are disposed in parallel on the water pressure receiving
portion 3. As shown in FIG. According to the present embodiment, in addition to the effects of the
first embodiment, the spring constant can be increased, so the water pressure resistance range
can be expanded.
[0019]
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Fourth Embodiment FIG. 4 is an explanatory view of a fourth embodiment of the present
invention. In this embodiment, a plurality of coil springs 8 are disposed in parallel on the water
pressure receiving portion 3. According to the present embodiment, in addition to the effects of
the second embodiment, the spring constant can be increased, so the water pressure resistance
range can be expanded.
[0020]
Fifth Embodiment FIG. 5 is an explanatory view of a fifth embodiment of the present invention. In
this embodiment, disc springs 7a and 7b are disposed in series in the vertical direction of the
water pressure receiving portion 3. According to the present embodiment, substantially the same
effect as that of the first embodiment can be obtained, but the spring constant can be reduced
while maintaining the water pressure resistance range as it is.
[0021]
Sixth Embodiment FIG. 6 is an explanatory view of a sixth embodiment of the present invention,
in which a plurality of coil springs 8 are disposed in series in the vertical direction of the water
pressure receiving portion 3. According to the present embodiment, substantially the same effect
as that of the second embodiment can be obtained, but the spring constant can be reduced while
maintaining the water pressure resistance range as it is.
[0022]
Seventh Embodiment FIG. 7 is an explanatory view of a seventh embodiment of the present
invention. In this embodiment, three disc springs 7a, 7b and 7c are disposed in series in the
vertical direction of the water pressure receiving portion 3. Also in the present embodiment,
substantially the same effect as that of the fifth embodiment can be obtained.
[0023]
In each of the above embodiments, the cylinder 1 is formed in a cylindrical shape, but the
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cylinder 1 may have a rectangular cross section or other shapes. However, in the case of using a
disc spring as the spring 7, it is necessary to form the water pressure receiving portion 3 on
which it is disposed in a cylindrical shape.
[0024]
As is apparent from the above description, in the underwater wave transmitter according to the
present invention, the spring having a constant spring constant is provided in the water pressure
receiving portion in order to suppress the characteristic change due to the operating depth. Even
if the operating depth changes, the characteristics of the underwater transmitter do not change,
and the transmitter characteristics can be stabilized over a wider operating depth.
[0025]
Brief description of the drawings
[0026]
1 is an explanatory view of a first embodiment of the present invention.
[0027]
2 is an explanatory view of a second embodiment of the present invention.
[0028]
3 is an explanatory view of a third embodiment of the present invention.
[0029]
4 is an explanatory view of a fourth embodiment of the present invention.
[0030]
5 is an explanatory view of a fifth embodiment of the present invention.
[0031]
6 is an explanatory view of a sixth embodiment of the present invention.
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[0032]
7 is an explanatory view of a seventh embodiment of the present invention.
[0033]
Explanation of sign
[0034]
Reference Signs List 1 cylinder 4 head mass 5 tail mass 6 driving element 7 spring 7 a to 7 c disc
spring 8 coil spring
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