Hemi-anechoic chamber foundation structure for detecting automobile noise attached equipment foundation

Abstract

The invention discloses a hemi-anechoic chamber foundation structure for detecting an automobile noise attached equipment foundation. The structure comprises a concrete foundation consisting of an equipment foundation concrete bottom wall and equipment foundation concrete side walls around the equipment foundation concrete bottom wall, wherein the top surfaces of the four equipment foundation concrete side walls extend outwards and are connected with a reinforced concrete slab; rock wool, a steel plate, a plastic plate and a galvanized steel sheet are laid in turn on the reinforced concrete slab; the reinforced concrete slab is laid on the galvanized steel sheet and the top opening of the concrete foundation; a latticed shock pad is embedded into the rock wool; a plurality of equipment foundation concrete frame posts of which the bottoms are connected with the equipment foundation concrete bottom wall are arranged in the concrete foundation; a shock pad is arranged between the top surface of each equipment foundation concrete frame post and the bottom surface of the reinforced concrete slab; and the reinforced concrete slab positioned on the top opening of the concrete foundation is provided with preserved holes. After the structure of the invention is adopted, background noise is up to 16 dB(A).

Description

technical field [0001] The invention relates to a basic structure, in particular to a basic structure of a semi-anechoic chamber with equipment foundation for detecting vehicle noise. Background technique [0002] The main function of the anechoic chamber is to provide a free-field or semi-free-field space for acoustic testing. Free field means that when sound waves propagate in infinite space, there are no reflectors or reflective surfaces. The free-field space in nature is to hang the sound source in the air, away from any reflectors, and the sound waves can freely propagate to a 360° omnidirectional angle. Semi-free field space means that there is a total reflection surface in free space, and sound waves can only propagate freely in the 180° hemispherical orientation. [0003] The anechoic chamber (or semi-anechoic chamber) is an extremely important experimental place in acoustic experiments and noise tests. Its role is to provide a low-noise test environment in a free...

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Problems solved by technology

These two patents have novel design, simple structure, low construction cost, good noise reduction and vibration isolation effects. But these two patents are applicable to the construction method of full anechoic chamber, not applicable to the construction method of semi-anechoic chamber

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