Micro-nano combined active-passive mixed sound absorption structure and control method thereof

An active-passive sound-absorbing technology, applied in the direction of sound-generating devices and instruments, can solve problems affecting the effect of active noise control and system nonlinearity, and achieve the effects of improved sound-absorbing performance, simple control, and reduced nonlinearity
CN102426832AInactive Publication Date: 2012-04-25HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
Publication Date
2012-04-25
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses a micro-nano combined active-passive mixed sound absorption structure and a control method thereof. The micro-nano combine active-passive mixed sound absorption structure is characterized in that nano tubes are uniformly filled in a sound absorption porous material to form a passive sound absorption structure, the front plane of the passive sound absorption structure is exposed in a vertically incident sound wave, and the back of the passive sound absorption structure is an elliptic plane; and the elliptic plane of the passive sound absorption structure is adhered with a piezoelectric film with the thickness in micron grade to form an active control execution device of the mixed sound absorption structure. In the invention, active noise control and the improved sound absorption material are combined to a specific mixed sound absorption structure, thus the effective sound absorption frequency band is greatly expanded, the volume of the sound absorption structure is greatly reduced, the active control voltage is reduced, and the control effect is better.
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Description

technical field

[0001] The invention relates to an active-passive hybrid sound-absorbing system, and proposes an active-passive hybrid sound-absorbing structure based on an impedance matching method. Through the combination of active control of noise and passive sound absorption of traditional porous sound-absorbing materials, good sound-absorbing effects can be obtained in a wide frequency range, and at the same time, the volume of the sound-absorbing structure is effectively reduced due to the use of micro-nano combination . Background technique

[0002] Noise is the third largest pollution source that harms the environment besides air pollution and water pollution. With the development of modern science and technology and the acceleration of social progress, the rapid development of mechanical processing and transportation has brought convenience to society, but at the same time, radiated noise has also brought harm. Research and control of noise is not only an urgent n...

Claims

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