Novel bionic composite sound absorption structure

Abstract

The present invention provides a novel bionic composite sound absorption structure. The structure comprises four parts consisting of fibers, a film, a hollow cylinder body and porous foamed aluminum.The uppermost layer of the fibers can employ natural or inorganic or synthetic fibre materials such as goose feather, woolen yarn and cotton cloth to simulate the strigimorphae wing covert; the secondlayer is film materials to simulate the surface skin of the strigimorphae surface skin; the third layer is the hollow cylinder body to simulate the lower cavity structure of the skin of the strigimorphae, and the third layer is fixed with the second layer of film and the fourth layer of foamed aluminum in a gluing mode; and the downmost substrate structure is the porous foamed aluminum to simulate the lower skin tissue of the strigimorphae. The novel bionic composite sound absorption structure can more accurately simulate key factors influencing sound absorption features in long-eared owl skin and wing covert physiological structure, is better in the sound absorption effect compared to a known bionic structure, and effectively increases the low-frequency sound absorption coefficient whilegreatly reducing the cost and the weight compared to a current traditional foamed aluminum sound absorption structure.

Description

technical field [0001] The invention relates to the field of sound absorption and noise reduction, in particular to a novel bionic composite sound absorption structure. Background technique [0002] With the development of modern industry and the improvement of people's living standards, people's requirements for the living environment are getting higher and higher. Among them, noise pollution has become one of the problems facing the world. The application of sound-absorbing materials and sound-absorbing structures is a way to reduce important means of noise pollution. [0003] Bionic acoustics is a marginal subject between bionics and acoustics, and it is also a very broad interdisciplinary subject. The streamlined design of aircraft wings imitating bird wings, and the development of sonar systems imitating dolphin sounds are all successful cases of bionic acoustics in human engineering. Similarly, we can apply bionics to the design of sound-absorbing structures in order...

AI Technical Summary

Problems solved by technology

Wang Yonghua and others used the analogy method to design the bionic structure of the long-eared owl's wings. They used polyurethane as the base material and designed a binary bionic model with trapezoidal ribbed surface and backing cavity based on the structural characteristics of owls. The meta-numerical method calculates the acoustic impedance and sound absorption coefficient of the bionic model of the plane surface, the trapezoidal ribbed surface and whether there is a backing cavity behind the surface. It can be seen from the calculation results that the sound absorption of the designed bionic coupling model is The performance is respectable, but there is still room for improvement

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