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JPS6253591

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DESCRIPTION JPS6253591
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
underwater noise detection apparatus mounted on a vessel for marine surveys. [Prior Art] In a
vessel conducting oceanographic surveys, it is necessary to prevent noise emitted from the own
vessel into the water from becoming a visitor to the oceanographic survey. Therefore, the
underwater noise generated by the ship is detected, and based on this, the operation of the
equipment in the ship is controlled, or when the noise is thick, the equipment for anti-vibration of
the ship is installed by providing the equipment with anti-vibration support. It has been
attempted to reduce noise. By the way, conventionally, as a method of detecting underwater
noise of this ship, in general, after a ship is completed, a hydrophone is suspended outside the
ship, or a hydrophone is installed in advance in the sea, The hydrophones are used to detect the
noise in the water emitted by the ship. However, according to this method, there is a problem
that noise in water can not always be detected. In order to avoid this problem, a method of
attaching the hydrophone to the bottom of the ship has been proposed. Specifically, as shown in
FIG. 4, the through hole 2 is provided in the bottom shell 1 and the hydrophone 3 is supported
by the mounting member 4 and the seal member 5, and the lower portion of the hydrophone 3 is
the bottom shell 1 And the box 6 is mounted on the inner surface of the bottom shell 1 as shown
in FIG. 5, and the hydrophone 3 is attached to the box 6 so that its tip extends inside. There is a
device which is configured to be filled with the liquid 7 in the box 6 and to detect underwater
noise through the liquid 7 with the hydrophone 3 while being attached. However, in these
methods, not only detection of the underwater noise emitted by the ship but also detection of the
vibration of the ship becomes impossible. , Using an expensive hydrophone 3. Therefore, it has
been expensive as a detection device. In addition, in the case of the former, since the hydrophone
3 is disposed so as to protrude below the bottom shell 1, the flow is disturbed around the
hydrophone 3 and the sound due to this is also detected. It was. SUMMARY OF THE INVENTION
04-05-2019
1
The present invention has been made to solve the above-mentioned drawbacks of the
conventional underwater noise detection system for a ship, and the object of the invention is to
improve the accuracy of the underwater noise emitted by the ship itself. The point is to detect
well and to reduce the cost of the device. [Summary of the invention] In order to achieve the
above object, the present invention mounts a box having a lid at the top on the inner surface of
the bottom of the ship, and on the inner surface of the shell around the box and on the lid. It is an
object of the present invention to provide an underwater noise detecting device of a ship in
which a damping material is disposed respectively and a sound absorbing material and an
acceleration pickup are disposed in the box body.
[Embodiment] An embodiment of the underwater noise detecting apparatus for a ship according
to the present invention will be described with reference to FIGS. 1 to 3. 1 is a side view of a ship
11 having a plurality of underwater noise detection devices A attached to the inner surface of a
ship bottom skin 12, FIG. 2 is a longitudinal sectional view of the underwater noise detection
device, and FIG. 3 is a plan view of FIG. FIG. A box body 14 having a lid 13 is mounted on the
inner surface of the bottom shell 12. The thickness W of the box body 14 is preferably
configured to be three or more times the thickness t of the bottom shell 12. A damping material
15.15 'such as rubber is attached around the box body 14 and on the hull outer plate 12 and the
lid 13. The thickness W 'of the damping material 15.15' is preferably configured to be twice or
more the thickness t of the bottom shell. A sound absorbing material 16 is attached to the back
side of the lid 13 in the box 14, and an acceleration pickup 17 is attached on the inner surface of
the bottom shell 12. The reference numeral 18 denotes a bolt for attaching the lid 13 to the box
14. With the above-described configuration, the outer plate vibration generated by the device or
the like in the ship is damped by the damping member 15, and the propagation vibration is
blocked by the box 14, so that it is provided inside the box 14. It will not be transmitted to the
acceleration pickup 17. Furthermore, since the air noise from the inside of the ship can be
suppressed as small as possible by the action of the damping material 15 'provided on the lid 13
and the sound absorbing material 16, the mounting portion of the acceleration pickup 17 is
limited only by the underwater sound of the hull. It will be excited and underwater noise can be
detected by acceleration. [Effects of the Invention] As described above, a box having a lid at the
top is mounted on the inner surface of the bottom of the ship, and damping materials are
respectively disposed on the inner surface of the outer periphery of the box and on the lid. In
addition, a sound absorbing material and an acceleration pickup are disposed in the box body.
And, as is clear from the above description, according to the underwater noise detecting device
for a ship according to the present invention, detection of vibrations and air noises in the ship
itself can be prevented, so accurate underwater noise detection In addition, there is an effect that
the cost reduction of Hz can be measured because the acceleration bidup is used.
[0002]
04-05-2019
2
Brief description of the drawings
[0003]
1 to 3 show an embodiment of the underwater noise detection system for a ship according to the
present invention, wherein FIG. 1 is a side view of the ship, and FIG. 2 is a longitudinal sectional
view of the underwater noise detection system. FIG. 3 is a plan view of FIG.
4 and 5 are each a longitudinal sectional view of a conventional underwater noise detector. 1.12 ·
· · Bottom plate of the ship, 2 · · · through hole, 3 · · · hydrophone, 4 · · · mounting member, 5 · · ·
sealing member, 6 · · · box body, 7 · · · liquid 11, 11: ship, 13: lid, 14: box, 15.15 ': dumping
material, 16: sound absorbing material, 17: acceleration pickup, 18: bolt .
04-05-2019
3
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