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Controllable underwater acoustic board

A sound-absorbing board and sound-absorbing layer technology, applied in the field of sound-absorbing materials, can solve the problems of poor low-frequency effect, narrow operating frequency bandwidth, and poor pressure-resistant performance of the sound-absorbing board, and achieve good sound absorption and sound insulation effect and low frequency effect. Good results

Inactive Publication Date: 2012-08-22
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, sound-absorbing panels have problems such as poor pressure resistance, narrow operating frequency bandwidth, and poor low-frequency effects. At the same time, materials and cavity structures are important factors that affect the acoustic characteristics of sound-absorbing panels.

Method used

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  • Controllable underwater acoustic board
  • Controllable underwater acoustic board
  • Controllable underwater acoustic board

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Embodiment Construction

[0021] The present invention will be further elaborated below in conjunction with accompanying drawing example:

[0022] combine figure 2 and 3 , the composition of the controllable underwater sound-absorbing panel includes a sound-absorbing layer 2, a sound-insulating layer 3, and a damping layer 4. The sound-insulating layer is located between the sound-absorbing layer and the damping layer. The layers are all made of polyurethane material, a horn-shaped cavity 5 is opened in the sound-insulating layer, and a shape-memory alloy driving element 7 is buried at the mouth 8 of the horn-shaped cavity. The shape memory alloy driving element is connected with the control system. The reinforced fiber layer 1 is arranged outside the sound-absorbing layer, and the reinforced surface fiber cloth can protect the stability of the chemical and physical properties of the internal materials and structures, keep the acoustic properties unchanged for a long time, and prevent corrosion and ...

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Abstract

The invention provides a controllable underwater acoustic board. The controllable underwater acoustic board comprises a sound-absorbing layer, a sound-insulating layer and a damping layer, which are made of polyurethane material, the sound-insulating layer is positioned between the sound-absorbing layer and the damping layer, the sound-insulating layer is provided with a flaring cavity, and a shape memory alloy drive element is buried in the mouth of the flaring cavity, and is connected with a control system. The controllable underwater acoustic board is provided with the acoustic covering layer which can actively regulate acting frequency and has a wide working band and a good low-frequency effect, and thereby has a good sound-absorbing and sound-insulating effect within the frequency range of hundreds of hertz and even a lower frequency range.

Description

technical field [0001] The invention relates to a sound-absorbing material, in particular to a sound-absorbing plate for vibration and noise reduction of ships and underwater vehicles. Background technique [0002] As an effective sound-absorbing structure, the sound-absorbing panel can not only control the radiated noise of the ship, but also be used in the cabin to effectively reduce the cabin noise. Meet the design requirements of low vibration and low noise for ships. [0003] The sound-absorbing panel is mainly made of rubber damping material. The low-frequency acoustic stealth performance of a uniform single material is not ideal. To improve the overall performance, a multi-layer structure or a resonant cavity structure can be used inside the matrix. The sound-absorbing panel can mainly adopt the following structural forms: (1) Increase the efficiency of sound waves converting sound energy into heat energy in the sound-absorbing panel, including the use of high dampin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/168B32B27/12B32B27/40
Inventor 姚熊亮王献忠庞福振孙龙泉陶景桥杨娜娜郭君
Owner HARBIN ENG UNIV
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