Light low-frequency broadband sound insulation combined structure

Abstract

The invention provides a light low-frequency broadband sound insulation combined structure. The light low-frequency broadband sound insulation combined structure includes a thin film phononic crystal structure and a local resonance crystal structure which are arranged in parallel; the middle part of the light low-frequency broadband sound insulation combined structure is a cavity; when the first-layer thin film phononic crystal structure is stimulated by sound waves, a local resonance phenomenon occurs in weights and tensioned adhesive elastic films both, so that the average displacement of an entire cell is zero, and sound is effectively insulated; an anti-phase oscillation phenomenon occurs in weights and tensioned adhesive elastic films in adjacent cells, and therefore, efficient sound insulation can be realized at a lower-frequency position; and when the second-level local resonance crystal structure is stimulated by sound waves, efficient sound insulation can be realized at a designed sound insulation target frequency. The light low-frequency broadband sound insulation combined structure has the sound insulation advantages of the two kinds of structures. According to the light low-frequency broadband sound insulation combined structure, sound insulation broadband can be broadened at low frequencies, and the sound insulation amount of the light low-frequency broadband sound insulation combined structure is higher than that of a homogeneous plate having same surface density as the combined structure by more than 10dB.

Description

technical field [0001] The invention relates to the technical field of sound insulation, in particular to a lightweight low-frequency broadband sound insulation combined structure. Background technique [0002] Since the 1950s, with the rapid development of aerospace, high-speed trains, power transmission and transformation projects, etc., noise problems have become increasingly serious and have attracted widespread attention. In the field of life, noise interferes with people's normal work and life, and long-term exposure to high-noise environments will cause harm to people's health. In the field of production, strong noise will cause the failure or even damage of equipment, resulting in accidents. In the military field, with the development of various weapons and equipment to extreme operating environments such as high-speed, light-weight, large-scale, and heavy-duty, the noise problem caused by it has become more prominent, which has seriously affected the combat and aco...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a light-weight low-frequency broadband sound insulation combined structure to solve the problems of light weight, low frequency, broadband and high-

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