Acoustic metamaterial noise reduction damping plate

Abstract

The invention provides an acoustic metamaterial noise reduction damping plate. The damping plate comprises: a mass unit group consisting of at least two metal mass blocks which are uniformly arranged in a linear manner at intervals, wherein the outer sides of the metal mass blocks are coated with electro-sensitive expansion strips, and the mass unit group is provided with circuit controllers for controlling the expansion of the electro-sensitive expansion strips; and viscous elastic films used for adhering all groups of metal mass blocks, wherein the composite layers are connected to the two sides of the viscous elastic films in a pressed mode through a viscous flow state damping rubber material. A plurality of mass unit groups are arranged in an array and are spaced by a soft frame, the thickness of the metal mass block is greater than that of the adhesive elastic film, the adhesive elastic film is adhered to the thickness center of the metal mass block, and the composite layer is provided with a plurality of punched holes. According to the invention, the influence of low and medium frequency noise on people and equipment can be weakened, the low and medium frequency noise reduction capability is improved, and the noise at a specific frequency can be reduced in an optimized manner.

Description

technical field [0001] The invention relates to the technical field of acoustic metamaterials, and more specifically relates to an acoustic metamaterial noise reduction damping plate. Background technique [0002] Due to the ubiquity of low-frequency vibration noise in daily production and life, on the one hand, it is an annoyance and a potential hazard to health, affecting people's work and life; on the other hand, it also severely restricts the performance of equipment products. For example, the vibration and noise of vehicles such as airplanes and vehicles not only affect the comfort of passengers, but may also damage instruments and even cause safety accidents. The noise of household appliances such as washing machines, air conditioners and refrigerators affects people's normal rest. Construction noise on construction sites and industrial production workshop noise will not only affect the surrounding residents, but also cause workers to feel irritable and reduce sleep q...

AI Technical Summary

Problems solved by technology

Compared with the processing methods for reducing low-frequency vibration and noise in the prior art, sound insulation materials and damping materials are mostly selected to realize the conversion of sound energy. However, when traditional materials are used to isolate sound waves and vibrations, the thickness of the sound insulation material parts is generally required. The size matches the wavelength of the sound wave, that is, the longer the wavelength of the sound wave, the thicker the thickness of the sound insulation material required. Although some metal materials have good sound insulation ability, the cost is too high, too heavy, and it is difficult to use flexibly

Existing damping materials can play a role in dispelling low-frequency noise, but the effect is single. In the face of noise of different frequencies, the existing damping plate either has insufficient frequency and noise reduction capabilities, poor noise elimination effect, or single noise reduction frequency. The noise processing effect is better only at a certain frequency

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