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Device of realizing adjustable sound absorption performance based on magnetorheological effect

A magneto-rheological effect and sound-absorbing technology, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of limited practical application value, insufficient rigidity of piezoelectric film, and insufficient structural strength, etc., and achieves wide adjustable sound absorption range and fast response , the effect of meeting the control requirements

Inactive Publication Date: 2017-04-26
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the insufficient rigidity of the piezoelectric film itself, the structural strength of the main material of the perforated plate is insufficient, which makes its practical application value limited.

Method used

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  • Device of realizing adjustable sound absorption performance based on magnetorheological effect
  • Device of realizing adjustable sound absorption performance based on magnetorheological effect
  • Device of realizing adjustable sound absorption performance based on magnetorheological effect

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Embodiment Construction

[0035] A device for realizing adjustable sound absorption performance based on the magneto-rheological effect of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] like figure 1 As shown, a device with adjustable sound absorption performance based on the magneto-rheological effect is composed of a sound absorption unit 1, a DC generation unit 2 and a current control unit 3 in series. The DC generating unit 2 is composed of an AC power source 21 , a rectifier 22 for converting AC power into DC power, and a transformer 23 for regulating operating voltage. The AC power 21 , the rectifier 22 and the transformer 23 are sequentially connected. The current control unit 3 is composed of a current flow controller 31 and a variable resistor 32 .

[0037] The sound-absorbing unit 1 is connected to a DC generating unit 2 and a current control unit 3, wherein the DC generating unit 2 converts AC ...

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Abstract

The invention discloses a device of realizing adjustable sound absorption performance based on magnetorheological effect. The device comprises a sound absorption unit, a direct current generating unit, and a current control unit, which are serially and sequentially connected together. The sound absorption unit comprises a perforated plate provided with a closed cavity, a magnetorheological fluid disposed in the closed cavity in a filled manner, and an excitation coil disposed on the outer side of the closed cavity in an encircled manner. The perforated plate is provided with a sound absorption hole disposed on the periphery of the closed cavity in an encircled manner, and the back part of the perforated plate is provided with a back cavity communicated with the sound absorption hole. The magnetorheological fluid is disposed in the closed cavity in the perforated plate in a filled manner, and the direct current generating unit is used to electrify the excitation coil disposed on the outer side of the closed cavity in an encircled manner, and the current control unit is used to control the magnitude and the direction of the current of the excitation coil, and therefore the magnitude and the direction of the magnetic field generated by the excitation coil are controlled, the apparent viscosity and other rheological properties of the magnetorheological fluid are further improved, and finally, the regulation and the control of the sound absorption performance of the perforated plate composite sound absorption structure are realized.

Description

technical field [0001] The invention relates to the technical field of sound absorption, in particular to a device for realizing adjustable sound absorption performance based on the magneto-rheological effect. Background technique [0002] With the continuous improvement of people's material and cultural level, modern theaters often need to meet multiple functions, such as music, singing and dancing, drama performances, etc. Different functions have different requirements on the reverberation time of the theater auditorium, so it is necessary to develop a technology for adjusting the reverberation time of the theater auditorium. There are currently two main methods to realize the adjustable reverberation time: the acoustic method and the electroacoustic method. [0003] The sound building method is a technology that changes the volume of the room or the sound absorption area of ​​the room by mechanical means to achieve adjustable reverberation time. The volume change metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16G10K11/165
CPCG10K11/161G10K11/165
Inventor 翟国庆林秦豪
Owner ZHEJIANG UNIV
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