JPH08211143A - Sound insulation structure of sonar dome - Google Patents

Abstract

PURPOSE: To improve a sound insulation wall used to shut out a noise transmitted into a sonar dome especially from the inside of a ship in the sound insulation structure of the sonar dome equipped at the bottom part of the ship. CONSTITUTION: A sound insulation wall 6 is constituted in such a way that many sound insulation blocks 1 are spread all over along the outer board face of a hull recessed outer board 7 which partitions a sonar dome 11 under the surface of the water. Every sound insulation block 1 is composed of a rubber wall or the like so as to be of a flexible hollow type. The initial pressure of a gas which is sealed up in its interior is set so as to be increased according to a water depth position in which every block 1 is installed. Thereby, even when the flexible wall part is pressed at the use of the block, a required gas layer thickness is held, and it is possible to ensure the sufficient sound insulation performance of a sound insulation structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulation structure for a sonar dome mounted on the bottom of a ship.

[0002]

2. Description of the Related Art As a conventional sonar dome sound insulation structure,
The gas layer is covered with a rubber outer cover, and as shown in FIG. 5, a hollow hollow sound insulation block 1 made of rubber is laid on the outer plate surface of the hull outer plate 7 on the sonar dome side. It is like this. Inside the sound insulation block 1, air 2 is sealed at atmospheric pressure during construction.

[0003]

By the way, in the conventional sonar dome sound insulation structure as described above, the sound insulation effect is to be obtained by the gas layer thickness d shown in FIG. 5, but the water pressure applied to the sound insulation block 1 in water is increased. Accordingly, if the block 1 is deformed into a concave shape as shown in FIG. 6, there is a problem that the gas layer thickness is significantly reduced and the sound insulation performance is deteriorated.

Therefore, as shown in FIG. 7, the sound insulation block 1
It is conceivable to insert the sponge plate 8 into the inside of the to prevent it from being deformed into a concave shape, but such a means has a drawback that the presence of the sponge plate 8 reduces the sound insulation effect. The present invention is intended to solve the above-mentioned problems, and it is possible to maintain a gas layer thickness in a sound insulation block of a sonar dome to a required thickness or more, thereby obtaining a sufficient sound insulation effect. It is intended to provide a sound insulation structure for a sonar dome.

[0005]

In order to achieve the above-mentioned object, the sound insulation structure of the sonar dome of the present invention has a rubber plate connected to an edge of a hull recess outer plate which forms a hull recess below the water surface. As the sonar dome is formed,
The inside of the sonar dome is provided with internal water and a sonar, and the inside of the ship is provided by a large number of gas-sealed hollow flexible sound insulation blocks spread along the outer plate surface of the hull recess outer plate facing the sonar. The sound insulation wall against noise is constructed, and the initial pressure of the gas sealed inside the sound insulation block is the water depth position where each sound insulation block is installed in order to keep the gas layer thickness in the sound insulation block above a required thickness. It is characterized in that it is set so that the pressure is increased according to.

Further, the sound insulation structure of the sonar dome of the present invention is characterized in that the sonar dome is provided at the bow portion, and the initial pressure inside the sound insulation block is set to approximately 3.6 kg / cm ² at a water depth of 0 m. There is.

Furthermore, the sound insulation structure of the sonar dome of the present invention is
The sound insulation block is characterized by being connected to a pressure adjusting means for adjusting the internal pressure of the block.

[0008]

In the sound insulation structure of the sonar dome of the present invention described above, each hollow type flexible sound insulation block forming a sound insulation wall along the outer plate surface of the hull outer skin is designed so that the internal gas is adjusted so as to correspond to the depth of water in which it is installed. Since the initial pressure of is increased so that the gas layer thickness more than the required thickness can be maintained at the time of use, the noise from the inside of the ship to the inside of the sonar dome can be sufficiently blocked, and it affects the sonar. The action of preventing adverse effects is performed.

Further, when the sonar dome is provided on the bow and the initial internal pressure of the sound insulation block is set to about 3.6 kg / cm ² at a water depth of 0 m, the rubber plate and the inside of the sonar dome are sailed during navigation. Even when the sound insulation block receives a strong water pressure through water, the sound insulation block can maintain a gas layer thickness equal to or more than a required value, and sufficiently acts to shield noise from the inside of the ship.

Further, if a pressure adjusting means for adjusting the internal pressure is connected to the sound insulating block, the gas layer thickness in the sound insulating block is maintained at a required thickness or more in accordance with changes in ship speed and draft. The action is accurately performed, and the sufficient sound insulation performance is always maintained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sonar dome sound insulation structure as one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a bow section schematically showing the overall construction, and FIG. 2 is a longitudinal section of a sound insulation block when a ship is constructed. FIG. 3 is a vertical cross-sectional view showing a form of the sound insulation block of FIG. 2 when it is used,
FIG. 4 is a vertical sectional view showing a state in which the pressure adjusting means is connected to the sound insulation block.

As shown in FIG. 1, a sonar dome 11 is formed so that a hull recess outer plate 7 forming a hull recess at the bow below the water surface and a rubber plate 9 connected to the edge thereof. Inside the sonar dome 11, a sonar 10 supported by supporting means (not shown) on the hull is provided, and internal water 12 is enclosed.

The sound insulation wall 6 is constructed by laying a large number of sound insulation blocks 1 along the outer plate surface of the hull recess outer plate 7 facing the sonar 10. In this embodiment, the front end of the sonar dome 11 forms a bow valve for reducing wave resistance.

As shown in FIG. 2, the sound insulation block 1 is constructed as a hollow flexible block composed of a rubber wall in which a gas 2 such as air or nitrogen gas is enclosed, and the sound insulation block 1 is constructed at the time of building the hull. The initial pressure of the gas sealed inside the block 1 is set so as to be increased according to the water depth position where the block 1 is installed. And water depth 0m
Also in the case of the sound insulation block 1 installed at the position, the internal pressure is set to about 3.6 kg / cm ² . That is, when the water depth at which the sound insulation block 1 is installed is xm, the initial internal pressure of the block 1 is set to be (3.6 + 0.1x) kg / cm ² .

Since the sound insulation structure of the sonar dome of this embodiment is constructed as described above, when the ship is in use after the service starts, the external water pressure is such that the rubber plate 9 and the water inside the sonar dome are water pressure.
It is transmitted to each sound insulation block 1 of the sound insulation wall 6 via 12.
Since the initial internal pressure increased according to the depth position of the block 1 is set in the block 1, even if the sound insulation block 1 is deformed from the shape shown in FIG. 2 to the shape shown in FIG. 3 during use, It is possible to secure a gas layer thickness D that is greater than or equal to the required thickness, and as a result, the transmission of noise from the inside of the ship to the inside of the sonar dome 11 can be sufficiently blocked, and the adverse effect on the sonar 10 can be prevented. it can.

Even when the sonar dome 11 is provided on the bow and the sound insulation block 1 receives a strong water pressure through the rubber plate 9 and the water inside the sonar dome 12 at the time of navigation, the initial inner pressure of the sound insulation block 1 is 0 m in depth. Almost 3.6k
Since it is set to g / cm ² , the sound insulation block 1 can maintain the gas layer thickness D above the required value regardless of changes in ship speed and draft, and this effectively shuts out noise from inside the ship. can do.

Regarding the internal pressure of each sound insulation block 1,
As shown in FIG. 4, the sound insulation block 1 has an air pipe 13 and a valve.
The pressure may be adjusted by connecting the pressure adjusting means consisting of 14 and the barometer 15, and in this case, the required gas layer thickness is accurately maintained,
Sufficient sound insulation performance will always be obtained.

[0018]

As described in detail above, according to the sound insulation structure of the sonar dome of the present invention, the following effects can be obtained. (1) Each hollow flexible sound insulation block that composes a sound insulation wall along the outer surface of the outer shell of the recess of the hull is used by increasing the initial pressure of the internal gas to correspond to the depth of the water in which it is installed Sometimes it is possible to maintain a gas layer thickness more than the required thickness, so that the transmission of noise from the inside of the ship to the inside of the sonar dome can be sufficiently blocked, and the adverse effect on the sonar can be accurately prevented. it can. (2) The sonar dome is installed on the bow, and the initial internal pressure of the sound insulation block is approximately 3.6 kg / cm at a water depth of 0 m.
^If it is set to ² , even when the sound insulation block receives strong water pressure through the rubber plate of the sonar dome and internal water during navigation, the sound insulation block can maintain the gas layer thickness above the required value, The noise from the inside of the ship can be sufficiently blocked. (3) If the pressure adjusting means for adjusting the internal pressure is connected to the sound insulation block, the gas layer thickness in the sound insulation block should be maintained at a required thickness or more regardless of changes in ship speed and draft. The sound insulation performance is always maintained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a bow section schematically showing the overall structure of a sound insulation structure for a sonar dome as an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an initial shape of a sound insulation block in the sound insulation structure of the sonar dome shown in FIG.

FIG. 3 is a vertical cross-sectional view showing a form when the sound insulation block of FIG. 2 is used.

FIG. 4 is a vertical cross-sectional view showing a state in which pressure adjusting means is connected to the sound insulation block of FIG.

FIG. 5 is a vertical cross-sectional view showing an initial shape of a conventional sound insulation block.

FIG. 6 is a vertical cross-sectional view showing a form of the sound insulation block of FIG. 5 when in use.

FIG. 7 is a conventional side view showing another example of a conventional sound insulation block.

[Explanation of symbols]

 1 sound insulation block 2 gas 6 sound insulation wall 7 hull concave outer plate 8 sponge plate 9 rubber plate 10 sonar 11 sonar dome 12 internal water 13 air pipe 14 valve 15 barometer

Claims (3)

[Claims] 1. A sonar dome is formed so that a rubber plate is connected to an edge of a hull recess outer plate that forms a hull recess below the water surface, and internal water sealed inside the sonar dome is formed. The sound insulation block is provided with a sonar, and a plurality of gas-sealed hollow type flexible sound insulation blocks laid along the outer plate surface of the hull recess outer plate facing the sonar constitutes a sound insulation wall against inboard noise. In order to keep the gas layer thickness at the required thickness above a certain level, the initial pressure of the gas sealed inside the sound insulation block is set to increase according to the water depth position where each sound insulation block is installed. The sound insulation structure of the sonar dome, which is characterized by 2. The sound insulation structure for a sonar dome according to claim 1, wherein the sonar dome is provided at a bow portion, and an initial pressure inside the sound insulation block is approximately 3.m at a water depth of 0 m.
Sound insulation structure of sonar dome, which is set to 6kg / cm ² . 3. The sound insulation structure for sonar dome according to claim 1, wherein the sound insulation block is connected to a pressure adjusting means for adjusting an internal pressure of the sound insulation block.