Fractal structure acoustic metamaterial based on electrorheological fluid

A technology of acoustic metamaterial and fractal structure, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of poor environmental adaptability, processing error deviation, etc., and achieve the effect of flexible and adjustable sound insulation frequency

Pending Publication Date: 2020-08-11
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI +1
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Problems solved by technology

Factors such as processing errors can easily lead to deviations between actual materials and design results; in addition, real environmental noise often has time-varying characteristics, and materials with fixed noise reduction frequencies are difficult to respond dynamically to changing noises, and the environmental adaptability is poor

Method used

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  • Fractal structure acoustic metamaterial based on electrorheological fluid
  • Fractal structure acoustic metamaterial based on electrorheological fluid
  • Fractal structure acoustic metamaterial based on electrorheological fluid

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 As shown, the electrorheological fluid-based fractal structural acoustic metamaterial 11 of the present invention includes a fractal structural acoustic metamaterial matrix 1 , a flow channel 2 , an electrorheological fluid 3 , a metal electrode 4 and a sealing film 5 .

[0025] Such as figure 2 As shown, the fractal structural acoustic metamaterial matrix 1 of the embodiment of the present invention is a cuboid structure, which is composed of two parts nested with concave and convex horizontal sections, and the cavity between the concave part and the convex part forms a flow Road 2. The horizontal section shape of the runner 2 is a Hilbert fractal curve. In this embodiment, the width of the flow channel is 4mm, and the size of the horizontal section is 60mm*60mm.

[0026] Such as image 3 As shown, the flow channe...

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Abstract

According to a fractal structure acoustic metamaterial based on an electrorheological fluid, a fractal structure acoustic metamaterial base body (1) is of a cuboid structure and is formed by nesting two parts with concave and convex horizontal sections, and a flow channel (2) is formed by a cavity between the concave part and the convex part; the shape of the horizontal section of the flow channel(2) is a Hilbert fractal curve; the flow channel (2) is filled with electrorheological fluid (3), metal electrodes (4) are attached to the two side walls of the flow channel (2), and wire outlet terminals of the metal electrodes are connected with a direct-current power source (10). When a sound wave is transmitted to the sound wave incident surface (6), the sound pressure of a target region at aspecific frequency is reduced due to the characteristics of strong reflection and equivalent high refractive index of a fractal structure acoustic metamaterial (11) based on the electrorheological fluid. The voltage of the direct-current power supply (10) is adjusted, so that the sound insulation frequency of the acoustic metamaterial (11) based on the electrorheological fluid shifts, and the sound insulation frequency of the acoustic metamaterial is adjusted and controlled.

Description

technical field [0001] The invention relates to a fractal structural acoustic metamaterial. Background technique [0002] With the acceleration of urbanization, noise has seriously endangered the quality of life and physical and mental health of residents, and has become one of the three major environmental hazards. Complaints about noise from traffic and large electrical equipment accounted for a relatively high proportion. Both traffic noise and power equipment operation noise have significant low-frequency line spectrum characteristics, and the low-frequency components below 1000Hz are prominent. Relevant studies have shown that the incidence of speech-frequency hearing loss is close to 14.37% when working or living in low-frequency and high-noise environments for a long time, and may even cause damage to the nervous system and organs. [0003] Corresponding vibration and noise reduction measures have been taken in the design process of transportation and power faciliti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 张超刘国强夏慧郁殿龙尹剑飞
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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