Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and device for quantification of vehicle noise modulation problem

A technology of car noise and noise, which is applied in the field of quantifying car noise modulation problems, and can solve problems such as time-consuming

Active Publication Date: 2019-01-11
CHONGQING CHANGAN AUTOMOBILE CO LTD
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for quantification of vehicle noise modulation problem
  • Method and device for quantification of vehicle noise modulation problem
  • Method and device for quantification of vehicle noise modulation problem

Examples

Experimental program
Comparison scheme
Effect test

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

Top stop frequency

Bottom stop frequency

serial number

Center frequency

Top stop frequency

Bottom stop frequency

1

50

0

100

25

1850

1710

1990

2

100

50...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

He present invention relates to a method and a device for quantification of a vehicle noise modulation problem which can solve the problem that the consumed time is much because a filter playback means is employed to determine the modulated noise problem frequency bands and the optimization degree of the noise modulation problem depends on engineers' subjective judgment in the prior art. The method for quantification of a vehicle noise modulation problem comprises the steps of: performing multi-band frequency band-pass filtering processing of original modulated noise to obtain a plurality of first noise after band-pass filtering; performing Hilbert transform for the first noise to obtain envelope lines corresponding to the first noise; performing Fourier transform for the envelope lines corresponding to the first noise to obtain the main amplitude modulation degrees of the envelope lines, corresponding to the first noise, at different moments; and determining the original modulated noise problem frequency bands and the modulation degrees thereof according to the main amplitude modulation degrees of the envelope lines, corresponding to the first noise, at different moments.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com