NVH (noise, vibration and harshness) semi-anechoic room test system and method

Abstract

The invention discloses NVH (noise, vibration and harshness) semi-anechoic room test system and method. The NVH semi-anechoic room test system comprises an anechoic room, a dynamometer chamber, a sound arrester and a sound-proof wall. The anechoic room is used for containing a device to be tested. A test bench base is arranged in the anechoic room, and the device to be tested is fixed on the test bench base. Elastic dampers are disposed between the test bench base and the base floor in the anechoic room. The dynamometer chamber is used for containing a test device. The test device comprises a dynamometer. The dynamometer chamber is provided with a dynamometer bottom plate. The test device is fixed on the dynamometer bottom plate. Elastic dampers are disposed between the dynamometer bottom plate and the base floor in the dynamometer chamber. The sound arrester encloses the device to be tested so as to spatially isolate the anechoic room and the dynamometer chamber and isolate sound. The soundproof wall is provided with a plurality of connecting shafts which penetrate through the soundproof wall in soundproof manner and are used for connecting the test device and the device to be tested for testing. The NVH semi-anechoic room test system can meet the multi-mode test needs and is effective in sound proofing and accurate in test data.

Description

technical field [0001] The invention relates to vehicle NVH testing, in particular to an NVH semi-anechoic chamber testing system and a NVH semi-anechoic chamber testing method. Background technique [0002] With the increasingly fierce competition in the automotive market and the increasingly diverse requirements of the market for automotive products, NVH (noise, vibration, vibration, and harshness) testing also poses challenges. Statistics show that about 1 / 3 of vehicle failures are related to vehicle NVH issues, and nearly 20% of the research and development costs of major companies are spent on solving vehicle NVH issues. The development of NVH research presents the following characteristics: [0003] 1. Complete test capability will guarantee the improvement of product NVH performance; [0004] 2. Applied in the whole vehicle design process, basically synchronized with the entire development process; [0005] 3. Computer simulation technology is widely used in the fi...

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Problems solved by technology

[0010] In addition to the single noise test of the engine, the traditional powertrain laboratory also has many disadvantages in the wedge noise reduction mode, such as: the wedge noise reduction material 41 is easy to age, deforms and has poor impact resistance, absorbs oil fumes, Dust, after a certain number of years of use (for example, 7 years), it will be stained with oil and cannot be cleaned, the effective service life is short, and the processing of low-frequency signals is insufficient, etc., and by figure 1 It can be seen that the length of the wedge sound-absorbing material 41 is relatively long, generally about 1.2 meters, so it takes up a lot of space and reduces the space utilization rate of the powertrain laboratory

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