Noise detection and noise reduction methods for vehicle fuel cell engine system

Abstract

The invention discloses noise detection and noise reduction methods for a vehicle fuel cell engine system. The detection method comprises the following steps of S1, carrying out a noise source identification test on a vehicle through a near field acoustic holography method, after an A weighted sound pressure level distribution diagram of noise at different positions of the vehicle is obtained, analyzing an average sound pressure level frequency spectrum to obtain a peak frequency of the noise, and computing to obtain a sound pressure level at the corresponding frequency; S2, further identifying a noise source and a vibration source through a near field vibration noise test for a position corresponding to the sound pressure level larger than a first preset sound pressure level threshold value; and S3, performing hammering test on a plate of an accessory at the position corresponding to the first preset sound pressure level threshold value under a vehicle acceleration test working condition in order to determine the influence of noise resonance. The noise reduction method comprises a step of adopting a sound absorption material and / or changing the internal structure and the weight ofthe noise source. By the adoption of the methods, reliability and durability of an engine system under a vehicle-mounted condition are improved, and the acoustic shock noise of the vehicle is improved.

Description

Technical field [0001] The invention relates to the field of new energy fuel cell engines, in particular to a noise detection and noise reduction method for a vehicle fuel cell engine system. Background technique [0002] With the continuous development of new energy vehicle technology research and development, the current NVH (Noise, Vibration, harshness) is more and more valued by social groups, and vehicle users are more and more concerned about the driving experience of the vehicle, so it is resolved The NVH-related technical methods of new energy engines are very important. At present, in the engines equipped with new energy hydrogen fuel cells on the market, there is generally very high acoustic shock noise in the rear of the vehicle and outside the rear cabin. The acoustic shock noise of some vehicles has greatly exceeded the national requirements for the acoustic shock noise of new energy vehicles, so how to reduce And to improve the sound, vibration and noise of new ene...

AI Technical Summary

Problems solved by technology

At present, in the engines equipped with new energy hydrogen fuel cells on the market, the rear part of the vehicle and the exterior of the rear compartment are generally very high in acoustic shock noise, and the acoustic shock noise of some vehicles has greatly exceeded the national requirements for the acoustic shock noise of new energy vehicles. Therefore, how to reduce It is particularly critical to improve the acoustic shock noise of new energy vehicles

[0003] Some of the prior art processing methods are very simple, and some vehicles only use the noise reduction method to deal with the acoustic shock noise

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