Engine noise detection semi-anechoic chamber

Abstract

The invention relates to the field of automobile manufacture, and particularly discloses an engine noise detection semi-anechoic chamber comprising laboratory soundproof walls, silencing walls and a test bench base which is used for placing test equipment and which is arranged in the foundation of the inner ground of a semi-anechoic chamber body. The silencing walls completely cover the inner surfaces of the laboratory soundproof walls. The housing structure in an anechoic chamber is eliminated, the silencing walls are fitted to the inner sides of the laboratory soundproof walls, and by means of structures of sound absorption wedges or planes and laboratory soundproof wall thickening or rubber plate arrangement, on the premise of meeting standard requirements of the anechoic chamber, background noise is lower and test effect is good; the structure of the anechoic chamber is simplified, and manufacture cost of the anechoic chamber is saved greatly.

Description

technical field [0001] The invention relates to the field of automobile manufacturing, in particular to a semi-anechoic chamber used for engine noise inspection. Background technique [0002] NVH refers to Noise (noise), Vibration (vibration) and Harshness (acoustic roughness). Since the above three appear at the same time and are inseparable in mechanical vibrations such as automobiles, they are often put together for research. NVH is a comprehensive issue to measure the quality of automobile manufacturing, and it gives the most direct and superficial feeling to automobile users. The industry abbreviates noise, vibration and comfort as NVH (Noise, Vibration, Harshness), collectively referred to as the NVH problem of vehicles, which is one of the concerns of major vehicle manufacturers and parts companies in the international automotive industry. According to statistics, about 1 / 3 of the failure problems of the whole vehicle are related to the NVH problem of the vehicle, an...

AI Technical Summary

Problems solved by technology

[0005] like figure 2 As shown, the anechoic chamber in the prior art mainly adopts the inner anechoic sound insulation wall 7 and the outer sound insulation wall 8 to form a room-in-a-room structure, that is, a double-layer hollow wall, but the structure of the anechoic room in the room is complicated, and the manufacturing Difficult, wasteful production costs

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