Control system for generating underwater noise by using cable as excitation source

Abstract

According to the control system for the underwater noise caused by the cable serving as the excitation source, the underwater noise generated by the cable due to mechanical vibration generated by alternating current excitation of a power system can be reduced, and technical support is provided for reducing underwater radiation noise of a naval vessel and improving sonar performance. According to the technical scheme, the control system for causing the underwater noise by using the cable as the excitation source is characterized in that an electric appliance is mounted on a boat body through an elastic mounting support A, and a power supply is mounted on the boat body through an elastic mounting support B; the electric appliance and the power supply are connected through a plurality of cables; the cable is connected in series with a low-pass filter used for filtering high-frequency alternating components of cable current; the plurality of cables are sparsely arranged, and the clear spacing is 0.1-2 times of the diameter of the cables, so that the interaction force between the cables is reduced.

Description

Technical Field

[0001] The invention relates to an underwater noise control system, in particular to a control system for underwater noise caused by using a cable as an excitation source, and belongs to the technical field of underwater noise control for ships. Background Art

[0002] The sources of underwater noise of ships are generally divided into three categories: mechanical noise, propeller noise and hydrodynamic noise. It is generally believed that the main source of mechanical noise is the main and auxiliary equipment. Cables are carriers of power transmission. Under certain conditions, such as when the diameter is large, they are regarded as transmission channels for vibration noise rather than as excitation sources. Therefore, when controlling underwater noise of ships, the vibration of the cable itself is usually not considered.

[0003] However, when the vibration noise of the main and auxiliary equipment is low, the vibration of the cable itself will become an important noise source, not only generating important underwater radiation noise, but also generating important interference that affects the performance of the sonar in the sonar platform area, so it is necessary to control it. Because the layout of cables on ships is distributed and global, it is different from the main and auxiliary equipment, which can be noise-reduced at the equipment level, and can only be controlled through overall design and construction. Summary of the invention

[0004] In view of this, the present invention provides a control system for underwater noise caused by cables as excitation sources, which can reduce the underwater noise generated by mechanical vibration of the cables due to alternating current excitation of the power system, and provide technical support for reducing underwater radiation noise of ships and improving sonar performance.

[0005] The technical solution of the present invention is: a control system for underwater noise caused by cables as excitation sources, wherein electrical appliances are installed on the hull through elastic mounting supports A, and the power supply is installed on the hull through elastic mounting supports B; the electrical appliances and the power supply are connected through multiple cables; a low-pass filter for filtering high-frequency alternating components of cable current is connected in series on the cables; multiple cables are sparsely arranged, and the net spacing is 0.1 to 2 times the cable diameter to reduce the interaction force between the cables.

[0006] As a preferred embodiment of the present invention: the cable is installed on the hull through an elastic support bracket.

[0007] As a preferred embodiment of the present invention: damping is provided at the connection between the elastic support and hanger and the hull.

[0008] As a preferred embodiment of the present invention, the electrical appliances and the power supply are arranged in two different cabins of the hull, the cable passes through the bulkhead between the two cabins, and damping is provided at the corresponding penetration locations.

[0009] As a preferred embodiment of the present invention, an acoustic covering layer is applied on the outer side of the hull.

[0010] Beneficial effects:

[0011] (1) The noise control system of the present invention connects a low-pass filter in series to the circuit to filter out the high-frequency components of the current; when arranging the cables, the spacing between the cables is ensured (for example, the net spacing is 0.1 to 2 times the cable diameter) to reduce the interaction force between the cables; thereby, the underwater noise generated by the mechanical vibration of the cables due to the alternating current excitation of the power system can be reduced, that is, the underwater noise caused by the cables themselves as an excitation source can be attenuated.

[0012] (2) In the noise control system of the present invention, the cable is fixed to the hull by means of an elastic support bracket, and damping material is laid at the root of the elastic support bracket to the hull to attenuate the transmission from the cable to the hull.

[0013] (3) In the noise control system of the present invention, damping is installed on the bulkhead where the cable passes through the cabin to attenuate the vibration of the bulkhead caused by the cable.

[0014] (4) In the noise control system of the present invention, an acoustic covering layer is laid on the outside of the hull to decouple the vibration of the hull and the vibration of the water medium, thereby reducing the generation of underwater noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of a control system in which the cable of the present invention is used as an excitation source to cause underwater noise;

[0016] Among them: 1-electrical appliances, 2-elastic mounting support A, 3-power supply, 4-elastic mounting support B, 5-cable, 6-low-pass filter, 7-elastic support bracket, 8-damping, 9-acoustic covering layer, 10-hull. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] This embodiment provides a control system for underwater noise caused by cables as excitation sources. The control system can control the vibration noise generated by the cables between electrical appliances and power supplies, reduce the underwater noise generated by mechanical vibrations of the cables due to alternating current excitation of the power system, and provide technical support for reducing underwater radiation noise of ships and improving sonar performance.

[0019] like Figure 1 As shown, the electrical appliance 1 and the power source 3 are arranged in two different compartments of the hull 10. The electrical appliance 1 is installed in the compartment A of the hull 10 through an elastic mounting support A2, and the power source 3 is installed in the compartment B of the hull 10 through an elastic mounting support B4; the electrical appliance 1 and the power source 3 are connected by multiple cables 5.

[0020] The mechanism of the cable 5 as an excitation source is that when an alternating current passes through the closely packed cables 5, the Lorentz force of the electrons forms a macroscopic mechanical vibration of the cable, which is then transmitted to generate underwater noise. In order to control the vibration noise generated by the cable 5 between the electrical appliance 1 and the power source 3, a low-pass filter 6 is connected in series to each cable 5. The function of the low-pass filter 6 is to filter out the high-frequency alternating current in the cable 5 and reduce the vibration force of the cable 5. In order to reduce the interaction force between the cables 5, multiple cables 5 are sparsely arranged instead of the traditional dense arrangement; as an example, the net spacing between adjacent cables 5 (the distance between the surfaces of adjacent cables) is 0.1 to 2 times the diameter of the cable 5.

[0021] At the same time, the cable 5 is installed on the hull 10 through the elastic support bracket 7. The function of the elastic support bracket 7 is to attenuate the transmission of the cable 5 to the hull 10; and the damping 8 is laid at the connection between the elastic support bracket 7 and the hull 10 to attenuate the vibration of the hull 10.

[0022] The cable 5 passes through the bulkhead 11 between the cabin A and the cabin B, and a damper 8 is laid at the corresponding cabin penetration location to attenuate the vibration of the bulkhead caused by the cable 5 .

[0023] In addition, an acoustic covering layer 9 is laid on the outer side of the hull 10 to decouple the vibration of the hull 10 and the vibration of the water medium, thereby reducing the generation of underwater noise.

[0024] Therefore, the control system can not only attenuate the underwater noise caused by the cable itself as an excitation source, but also attenuate the vibration noise transmitted to the hull through the equipment along the cable, thereby improving the performance of the affected sonar.

[0025] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A method for controlling underwater noise caused by using cables as an excitation source, wherein an electrical appliance (1) is mounted on a hull (10) via an elastic mounting support A (2), and a power source (3) is mounted on the hull (10) via an elastic mounting support B (4); the electrical appliance (1) and the power source (3) are connected via a plurality of cables (5); the method is characterized in that: The cable (5) is serially connected with a low-pass filter (6) for filtering out high-frequency alternating components of the cable current; The plurality of cables (5) are sparsely arranged, with a net spacing of 0.1 to 2 times the diameter of the cable (5).

2. The method for controlling underwater noise caused by using a cable as an excitation source as claimed in claim 1, characterized in that: The cable (5) is installed on the hull (10) via an elastic support bracket (7).

3. The method for controlling underwater noise caused by using a cable as an excitation source as claimed in claim 2, characterized in that: A damper (8) is provided at the connection between the elastic support bracket (7) and the hull (7).

4. The method for controlling underwater noise caused by using a cable as an excitation source according to any one of claims 1 to 3, characterized in that: The electrical appliances (1) and the power source (3) are arranged in two different cabins of the hull (10), the cable (5) passes through the bulkhead (11) between the two cabins, and damping (8) is laid at the corresponding cabin penetration.

5. The method for controlling underwater noise caused by using a cable as an excitation source according to any one of claims 1 to 3, characterized in that: An acoustic covering layer (9) is provided on the outer side of the hull (10).

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