JP2002166878

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DESCRIPTION JP2002166878
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
underwater receiver suspension structure in an underwater acoustic sensor buoy system.
[0002]
FIG. 2 is a view showing a general expansion state of the underwater acoustic sensor buoy
system. The underwater acoustic sensor buoy system includes the underwater wave receiver 1,
the floating portion 2, the suspension cable 3, the damper 4, and the vibration damping cable 5.
And the hanging lower case 6.
[0003]
The underwater wave receiver 1 receives an acoustic signal in water and converts it into an
electrical signal, and the floating unit 2 transmits the electric signal from the underwater wave
receiver 1 as a radio wave to a ship, an aircraft, a land station, etc. It has a buoyancy.
The suspension cable 3 is for suspending the underwater wave receiver 1 at a predetermined
depth.
[0004]
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Further, the damper 4 is a means for suppressing the transmission of the vertical movement
vibration of the floating portion 2 due to waves to the underwater wave receiver 1, and the
vibration damping is performed together with the vibration damping cable 5 having a helical
form and a spring property. It constitutes a system.
[0005]
The underwater receiver 1 is connected to the suspension case 6 by a vibration damping cable 5,
and the suspension cable 3, the vibration damping cable 5 and the damper 4 are stored and held
before the buoy system is expanded in water.
The underwater acoustic sensor buoy system having such a configuration is entirely stored and
stored in a cylindrical storage container (not shown) before being expanded in water.
[0006]
2. Description of the Related Art FIG. 3 is a view showing a conventional suspension case in a
buoy system for an underwater acoustic sensor, with a part broken away to show the inside.
[0007]
The suspension case includes a cylindrical case body 7, a plate 8 firmly fixed to the case body 7
by a screw or a rivet or the like, and a clip 9 firmly fixed to the plate 8 by a screw or a rivet or
the like.
[0008]
The hook strap 10 is connected at one end to the suspension cable 3 and at the other end to the
clip 9.
The vibration damping cable 5 is also connected to the clip 9, and the clip 9 forms a mechanical
connection between the cable strap 10 and the vibration damping cable 5.
[0009]
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However, the suspension case in the conventional underwater acoustic sensor buoy system has
the following problems.
[0010]
When the floating portion 2 vibrates up and down due to waves or the like, the hanging case 3
connected to the floating portion 2 by the suspension cable 3 and the hook strap 10 performs
vertical vibration similar to that of the floating portion 2.
The downward movement of the hanging case 6 is due to the forced movement of the vibration
damping cable 5 due to its spring property (restoring force).
[0011]
When such vertical vibration is repeated in the water, the case body 7 causes lateral vibration
with a connection point of the clip 9 as a fulcrum due to fluid resistance or the like.
At this time, the end of the case body 7 collides with the suspension cable 3 or the vibration
damping cable 5 to generate pulse-like vibration. There is a problem that the acoustic
performance of the underwater wave receiver 1 is deteriorated by transmitting the vibration to
the underwater wave receiver 1 via the damper 4.
[0012]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention relates to a suspension case provided with a cylindrical case body, a plate fixed to the
case body, and a clip fixed to the plate. In an underwater receiver suspension structure in which
an underwater receiver is connected by a vibration damping cable, a holder contacting with the
case main body and a suspension cord are provided, one end of the suspension cord is connected
to the clip, and the other end is a center It is held and the other end is connected to the vibration
damping cable, and the case main body is supported at two points of the hanging string
connecting point of the clip and the center of the holder via the hanging string 11.
[0013]
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing an
embodiment of the present invention, in which a part of a suspension case in an underwater
acoustic sensor buoy system is broken to display the inside.
[0014]
The same reference numerals are given to the same components as shown in FIG.
[0015]
The hanging cord 11 is made of flexible nylon, Kevlar (all are trade names), etc. One end is tied to
the clip 9 and the other end is center-held by the holder 12 and the other end is a vibration
damping cable It is tied to five.
[0016]
The holder 12 is formed of plastic having a certain degree of flexibility, such as polypropylene,
and is formed in a disk shape so as to be in contact with the case main body 7.
[0017]
The shape of the holder 12 is preferably disc-shaped because the circumferential portion
contacts the case main body 7, but it may be polygonal or cruciform.
[0018]
A protrusion 13 is formed at the center of the holder 12, and a hole through which the hanging
cord 11 and the hanging cable 3 penetrate is formed at the center of the protrusion 13.
[0019]
The hanging cord 11 is held at the center of the holder 12 by tying a knot and holding it on the
projection 13 after passing through the hole.
[0020]
The holder 12 is configured to be vertically slidable while making its circumferential portion
contact the inner surface of the case main body 7 in a state where the suspended string 11 is
held in the center, and is housed in the case main body 7.
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[0021]
The vibration damping cable 5 is connected to the suspension cable 3 passing through the holder
12 and the suspension cord 11, and by sliding the holder 12 upward in the case main body 7, the
suspension cable is suspended from the suspension case. 3, the hanging cord 11, the holder 12,
the vibration damping cable 5, etc. can be stored.
[0022]
According to this configuration, in the hanging case, one end of the hanging cord 11 is connected
to the clip 9, the other end is center-held by the holder 12, and the other end is connected to the
vibration damping cable 5, and the holder 12 Make circumferential contact with the case body 7.
[0023]
Therefore, the case body 7 is supported at two points supported by the hanging string
connecting point of the clip 9 and the center of the holder 12 via the hanging string 11 and the
case body 7 is shaken by the vertical vibration. Be suppressed.
[0024]
In the case where the holder 12 is formed in a polygonal shape or a cross shape, the same effect
can be obtained because the outer corner portion contacts the case main body 7.
[0025]
In the embodiment described above, the hook strap 10 and the hanging strap 11 have been
described as separate bodies, but after connecting the hook strap 10 to the clip 9, it is extended
and center-held by the holder 12. You may connect it.
In this case, the connection point of the clip 9 to the connection point of the attenuation cable 5
corresponds to the hanging cord 11.
[0026]
As described above, according to the embodiment, by supporting the case body 7 at two points
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by the hanging cord 11, the clip 9 and the holder 12, the case body 7 at the time of vertical
vibration of the hanging case 6 shown in FIG. Shaking is suppressed.
Therefore, it is possible to suppress the pulse-like vibration due to the rolling of the case body as
in the conventional case, and to prevent the acoustic performance deterioration of the
underwater wave receiver 1.
[0027]
As described above, according to the present invention, since the lateral movement of the case
body is suppressed, deterioration of the acoustic performance of the underwater wave receiver
can be prevented, and in particular, a buoy system for an underwater acoustic sensor It is
effective when applied to an underwater receiver suspended buoy system using an acceleration
sensor.
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