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A method and device for quantifying automotive noise modulation problems

A technology of automobile noise and noise, which is applied in the field of quantitative automobile noise modulation, can solve the problems of time-consuming, etc., and achieve the effects of improving efficiency, avoiding redundancy, and avoiding one-sidedness

Active Publication Date: 2022-04-08
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for quantifying the modulation of automobile noise, so as to solve the problem of modulated noise in the prior art. Make subjective judgments, resulting in more time-consuming problems

Method used

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  • A method and device for quantifying automotive noise modulation problems
  • A method and device for quantifying automotive noise modulation problems
  • A method and device for quantifying automotive noise modulation problems

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Embodiment Construction

[0069] refer to figure 2 , the present invention provides a method of quantifying automotive noise modulation problems, comprising:

[0070] Step 1: Perform multi-band bandpass filtering on the original modulated noise to obtain a plurality of first noises after bandpass filtering.

[0071] Among them, as for the modulated noise, it is generated under certain working conditions and collected by the sound pressure collection device arranged in the cockpit. The "cough cough" sound collected from the right ear.

[0072] First, generate a corresponding band-pass filter according to the designed frequency band, for example, generate a corresponding band-pass filter for the frequency band divided as shown in Table 1.

[0073] serial number Center frequency Up stop frequency Bottom stop frequency serial number Center frequency Up stop frequency Bottom stop frequency 1 50 0 100 25 1850 1710 1990 2 100 50 150 26 1990 1850 2130 3 150...

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Abstract

The present invention relates to a method and device for quantifying the modulation of automobile noise, in order to solve the problem of modulated noise in the prior art. The frequency band needs to be determined by means of filtering and playback, and the degree of optimization of the noise modulation problem needs to rely on the subjective judgment of engineers. , resulting in more time-consuming problems. The method for quantifying the modulation of automobile noise of the present invention includes: performing multi-band band-pass filter processing on the original modulated noise to obtain a plurality of first noises after band-pass filtering; Transform to obtain envelopes corresponding to a plurality of first noises respectively; perform Fourier transform on the envelopes corresponding to a plurality of first noises respectively, to obtain the main points of the envelopes corresponding to each of the first noises at different times Amplitude modulation degree: according to the main amplitude modulation degree of the envelope curve corresponding to each of the first noises at different times, determine the problematic frequency band of the original modulated noise and its modulation degree.

Description

technical field [0001] The invention relates to the field of automobile NVH performance, in particular to a method and device for quantifying automobile noise modulation problems. Background technique [0002] The NVH performance of automobiles is an important factor to improve the quality of automobiles, and has been valued by the majority of automobile manufacturers in recent years. During the development process of the whole vehicle, sometimes there will be some noise modulation problems. Onomatopoeic words are used to describe these modulation phenomena, such as the "cough" sound of acceleration, the "click" sound of fuel pulsation, the "frame" sound of exhaust tailpipe, etc. What these problematic noises have in common is that there are intermittent sounds, and the intermittent times are regular. Take the "cough cough" sound when climbing a slope at a constant speed of 2000rpm as an example. Through filtering and playback, it is found that the "cough cough" sound is r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02H03H17/06
CPCH03H17/0211H03H17/0213H03H17/0614
Inventor 廖祥凝庞剑杨亮靳红英
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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