Car interior sound field visualization method applied to active noise control over car engine

A technology of active noise control and automobile engine, applied in speech analysis, instruments, etc., can solve the problems that it is difficult to ensure the accuracy of active control and affect the noise reduction performance of the system

Inactive Publication Date: 2019-08-23
AUTOMOBILE RES INST OF TSINGHUA UNIV IN SUZHOU XIANGCHENG +1
View PDF7 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing control algorithm not only affects the noise reduction performance of the system due to the existence of acoustic feedback and acoustic delay problems, but the algorith...

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
  • Car interior sound field visualization method applied to active noise control over car engine
  • Car interior sound field visualization method applied to active noise control over car engine
  • Car interior sound field visualization method applied to active noise control over car engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0031] The vehicle interior sound field visualization method applied to the active noise control of automobile engine of the present invention comprises the following steps:

[0032] (1) Test of the sound field distribution in the car under the vibration and noise of the car engine

[0033] The purpose of the sound field test is to provide time-domain data signals for the visualization of the sound field. By arranging the microphone 1 in the car to test the sound field in the car under the vibration and noise of the car engine, it is best to arrange multiple microphones 1 in the car to complete the test at one time, but During the actual test, due to the limitation of the number of microphones 1 and the large number of sound field distribution measuring points, it is difficult to finish the test at one time. Therefore, the present invention ad...

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

The invention discloses a car interior sound field visualization method applied to active noise control over a car engine. The car interior sound field visualization method comprises the steps that (1) car interior sound pressure values under car engine vibration noise are tested; and (2) sound field modal coefficient recognition and sound field distribution visualization are conducted, specifically, a, time domain signals of sound pressure values of test point positions are converted into frequency domain signals; b, sound pressure values of all the positions are calculated through a modal expansion equation; c, modal parameters are recognized according to the sound pressure values obtained in the step a; d, the sound pressure values of all the positions of a sound field are calculated; and e, the calculated sound pressure values are subjected to cloud picture displaying. According to the car interior sound field visualization method applied to active noise control over the car engine, through the time domain signals tested in sound field distribution and a modal expansion formula obtained by an acoustic wave equation, car interior sound field visualization can be realized under the engine vibration noise, and reference can be provided for optimizing the active noise control effect and error microphone arrangement.

Description

technical field [0001] The invention relates to the technical field of automobile active noise control, in particular to a method for visualizing an interior sound field applied to the active noise control of automobile engines. Background technique [0002] Vehicle noise is an important performance index in the study of vehicle NVH, and has become a key factor affecting ride comfort. Among them, engine vibration noise is the main source of vehicle interior noise, and its frequency is distributed in the low-frequency range of 10-300 Hz. Traditional passive noise control methods have limited control effects on low-frequency noise. It is very important to study active control methods for automotive engine noise. [0003] Active noise control uses the sound wave interference theory to weaken and cancel the sound, so as to achieve the purpose of noise reduction. The control system is divided into a feedforward system and a feedback system. The feedforward system drives the seco...

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
IPC IPC(8): G10L21/0208G10L21/0216G10L21/0224
CPCG10L21/0208G10L21/0216G10L21/0224G10L2021/02166
Inventor 韩强钟少伟彭博郑四发
Owner AUTOMOBILE RES INST OF TSINGHUA UNIV IN SUZHOU XIANGCHENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap