Controllable underwater acoustic board

A sound-absorbing panel 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, poor pressure resistance performance of sound-absorbing panels, etc., and achieve good low-frequency effect, good sound absorption and sound insulation effect of effect

Inactive Publication Date: 2012-02-15
HARBIN ENG UNIV
View PDF6 Cites 15 Cited by
  • Summary
  • 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-freq

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Controllable underwater acoustic board
  • Controllable underwater acoustic board
  • Controllable underwater acoustic board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

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

[0022] to 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 a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap