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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

Inactive Publication Date: 2012-04-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0009] 2. When the frequency is below 100Hz, the control voltage of the piezoelectric film is above 100V, so that when the system is working, the in-plane and out-of-plane displacements of the piezoelectric film are not strictly equal, which leads to the nonlinearity of the system and affects the active noise control. Effect

Method used

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

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Embodiment Construction

[0027] see figure 1 , figure 2 In this embodiment, the active-passive hybrid sound-absorbing structure combined with micro-nano is uniformly filled with nanotubes in the porous sound-absorbing material to form a passive sound-absorbing structure 2, and the front plane of the passive sound-absorbing structure 2 is exposed to vertically incident sound waves , the back is an elliptical surface; on the back elliptical surface of the passive sound-absorbing structure 2, a layer of piezoelectric film 1 with a thickness in the order of microns is attached to form an active control actuator of the hybrid sound-absorbing structure;

[0028] figure 1 The plexiglass flange 3 is placed on the surface of the passive sound-absorbing structure 2 that is not covered with the piezoelectric film to ensure the airtightness of the back cavity 5, and at the same time play a role in connecting with the impedance tube in the experiment; the back cavity 5 is used for The entire sound-absorbing str...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16G10K11/178G10K11/02
Inventor 段秀华王焕钦陈然孔德义尤晖孙文娟高理升陈池来钱玉洁刘友江
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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