Fractal structure acoustic metamaterial based on electrorheological fluid

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...

AI Technical Summary

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

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