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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibration isolation structure of an underwater transducer.
2. Description of the Related Art Heretofore, an apparatus of this type has been disclosed in
Japanese Patent Publication No. 63-62958 and has a structure in which a transducer is
suspended by an elastic member such as a rubber string. FIG. 3 is a cross-sectional view showing
an example of a conventional transducer vibration isolation structure. In the figure, 1 is a
transducer, 2 is a mounting case excellent in sound transmission, 3A to 3D are vibration
absorbing and contracting members such as rubber cords, and 4 is a structure such as a hull.
Thus, the transducer 1 is suspended by a plurality of vibration isolation telescopic members 3A
to 3B, and the other ends of the vibration isolation telescopic members 3A to 3B are fixed to the
mounting case 2. And, this mounting case 2 is structured to be fixed to a structure 4 such as a
However, in the apparatus of the above configuration, when vibration isolation is performed at a
low frequency, the resonance frequency must be lowered. Usually, the resonance frequency fo
can be expressed by the following equation.
Here, K is a spring constant, and M is a mass.
As can be seen from this equation, it is necessary to reduce the spring constant K or to increase
the mass M in order to lower the resonance frequency fo. Therefore, in order to reduce the
spring constant, it is necessary to lengthen the vibration isolation elastic member, the vibration
isolation structure becomes large, and it is necessary to soften the rubber material. On the other
hand, in order to increase the mass M, the weight of the transducer increases and the vibration
isolation structure also increases.
Since such an underwater transducer is attached to a ship or the like only when it is used, it is
stored in a warehouse for a long time until it is mounted on a ship, etc. However, it is attached to
a ship etc. In the state of being kept in the air for a long time, such as not always covered with
water in a tank for ballast etc., the weight of the transmitter / receiver's airborne weight is long
for a vibration-proof stretchable member such as a rubber cord As a result, the life of the
vibration-proof stretchable member is shortened as compared to the case where the
surroundings are underwater.
This invention eliminates the problem of shortening the service life of the elastic member such as
a rubber string described above, lowers the resonance frequency even by a small amount, and
uses a transducer vibration-proof structure that can be used at a low frequency. Intended to be
SUMMARY OF THE INVENTION According to the present invention, there is provided a structure
in which vibration isolation is achieved by suspending a transducer with a springy material such
as a rubber string or the like. At the bottom, apart from the antivibration telescopic member, a
structure for supporting the transducer with a support telescopic member such as a rubber
string is provided.
With the above construction, the present invention can support the support telescopic member
when the transducer is suspended in the air, thereby reducing the force applied to the antivibration telescopic member.
described with reference to the drawings.
FIG. 1 is a side view showing an embodiment of the present invention, and FIG. 2 is a crosssectional side view of FIG.
In these figures, 5A and 5B are support telescopic members such as rubber straps for supporting
the transducer 1 in the position shown by a dotted line when the transducer 1 is placed in the
air, and both ends thereof are the mounting case It is fixed to 2.
The transducer 1 is suspended at a position indicated by a solid line by a plurality of vibration
isolation telescopic members 3A to 3D, and the other ends of the vibration isolation telescopic
members 3A to 3D are mounted with excellent sound transmission. It is fixed to case 2.
Then, when the above state is placed in the air, the elastic member for support having elasticity
such as a rubber cord so that the whole weight of the transmitter-receiver 1 is not added to the
elastic members for vibration prevention 2A to 2D. The transmitter-receiver 1 is supported by 5A
and 5B.
For this reason, when the transducer 1 enters the water, the transducer 1 is separated from the
support telescopic members 5A and 5B by the buoyancy of the transmitter and suspended by the
anti-vibration telescopic members 3A to 3D. It is possible to lower
As described above in detail, according to the present invention, the weight of the transducer is
supported by the support telescopic member when it is left in the air, so that it can be used for
vibration control. The force applied to the telescopic member is reduced, and the life of the antivibration telescopic member can be extended. When placed in water, due to the buoyancy of the
transducer, the transducer is located above as compared to when it is left in the air, so it is
separated from the support stretch member, and the anti-vibration stretch member originally
provided for the purpose of vibration isolation It is hung on the wall to obtain the original antivibration performance.
On the other hand, when vibration is received in the air, the transducer is not subjected to a
harmful impact due to the spring property of the support telescopic member, and when
underwater, it is suspended by the telescopic elastic member. When the amplitude is large in the
resonance frequency band, the transmitting and receiving members are received by the support
telescopic member, the excessive force is not applied to the vibration-proof telescopic member,
and the life of the vibration-proof telescopic member is extended. Can. In this case, the resonance
frequency of the vibration isolation stretchable member is equal to or less than the operating
frequency band of the transducer.
Furthermore, by using the present structure, the force applied to the vibration-proof stretchable
member can be reduced, and the life of the vibration-proof stretchable member used at a low
frequency can be extended.
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