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JPS6046700

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DESCRIPTION JPS6046700
[0001]
The present invention relates to an l'D lower type low noise receiver using a mass damper. In the
? lower type wave receiver that is suspended in water from a l'Y solid float or the like on a ship
or sea 1n1 and measures the underwater sound, the movement of the float or the like due to
waves is transmitted to the wave receiver, so-called self- Noise is generated. Therefore, in order
to prevent such self noise, conventionally, as shown in FIG. 1, a flexible mass damper 1 formed
by a frame and a cloth covering the outer periphery of the frame is made of rubber vJ '-. Eta ..
And a low frequency vibration isolation receiver in which the receiver 3 is disposed in the .sigma.
This low frequency vibration isolation type receiver performs low frequency vibration isolation
with the flexible mass damper 1 as Ma s s and the rubber elastic material with the titT string 2 as
compliance. As the mass damper = 1 is a soft one composed of a frame and a cloth like this, it has
the disadvantage of being easily hit and damaged when it is stored or put on a ship, etc. [Met. In
addition, although it is conceivable to use a rigid mass damper in order to improve the handling,
in the conventional rigid mass damper, sheel portocks are used depending on the water flow hole
for letting water flow in and out and the volume in the mass damper. 11 (b has been configured,
there is a drawback that the self-generated noise due to oscillation is rather high. An object of the
present invention is to obtain a lowermost low noise receiver capable of solving these drawbacks,
and therefore, by arranging the receiver in a rigid mass damper whose one end is open, the
handling property is improved. As well as reducing self-generated noise. Fig. 2 is a perspective
view showing an embodiment of the present invention. In the figure, 4 is a rigid mass damper
capable of obtaining good sound transmission in water, and is formed of a brassic or the like. The
structure is the bottom of the hollow thread cylindrical body (a structure in which the weir is
removed and opened once. In this embodiment, the mass damper 4 is supported 1 '11 below the
rubber string 2 by the lower string 2 of the rubber material, the wave receiver 3 is disposed
therein, and the weight 5 is taken under the mass damper 4 The mass of the water in the mass
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damper 4 and the mass of the water moving with the mass damper 4 (Mass added) and the
weight 5 are M a s s It has been shaken. 11'l In the lower type receiver, when a flexible mass
damper is used, the resonance frequency f of the vibration isolation system.
Is the mass of the town и mass damper part (including weight) 1? 12 и hydrous l (mass of water
in the mass damper) m 5 и и 41 m 2 In the equation of Mas added by the shape 2 In2 knee R 11
The experimental formula of the radius of the mass damper is introduced, but as a result of an
experiment conducted on a rigid mass damper in January, it becomes ln 2 ? 1 / 1.5 R, and it has
a smaller structure and lower frequency than the flexible mass damper. Vibration isolation can be
realized. Also in the case of the rigid mass damper 4 having a structure in which the lower plate
is removed as in the present invention shown in FIG. 2, the resonance frequency is not changed
at all. FIG. 3 is a characteristic diagram comparing the present invention with the prior art, and
shows an example of self-generated noise analysis of a counter wave model experiment in which
the wave receiver is moved up and down at a wave height of 2.4 m and 0.15 Hz. . As is apparent
from this figure, when the mass damper has a bottom plate, noise peaks occur in the self noise
and the noise level is high, but when the bottom plate is removed and opened at one end as in
the present invention, On the other hand, self-shoulder (the sound is lower by about 20 dB, and
in the case of the bottom plate, it takes a long time to drain the water inside the mass damper at
the time of recovery, There is nothing to do. That is, the small-size, low-frequency vibration
isolation is 1 "ability, and the handling at the time of recovery work etc. is easy, and a low-noise
suspension type receiver can be realized. In the embodiment described above, although the
receiver of IC 1 ? has been described, as shown in FIG. 4, the structure comprising 111 lower
cord 2, receiver 3, rigid mass damper 4 and weight 5 The same effect can be obtained by
connecting a plurality of C.sup. As described above, according to the present invention, since the
receiver is disposed in the rigid mass damper which is open at one end, the receiver is good in
handling and low in self noise generation. It can be realized.
[0002]
Brief description of the drawings
[0003]
1 is a perspective view showing a conventional 113 lower type wave receiver, FIG. 2 is a
perspective view showing one embodiment of the present invention, and FIG. 3 is a characteristic
diagram comparing the present invention with a conventional example, FIG. The figure is a
perspective view showing another embodiment of the present invention.
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