Reference signal selection method for active control of automobile road noise

A reference signal, active control technology, applied in the recognition of patterns in the signal, complex mathematical operations, instruments, etc., can solve the problem of optimizing the position and quantity of reference signals, few selection methods, etc., to achieve the effect of position and quantity optimization

Active Publication Date: 2020-01-14
AUTOMOBILE RES INST OF TSINGHUA UNIV IN SUZHOU XIANGCHENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The selection of reference signals is very important in the active control of vehicle road noise, but there are few existing selection methods, and there is no method that can optimize the position and number of reference signals while selecting

Method used

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  • Reference signal selection method for active control of automobile road noise
  • Reference signal selection method for active control of automobile road noise
  • Reference signal selection method for active control of automobile road noise

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Embodiment 1

[0052] Embodiment 1: When the vehicle is running, the road excitation is transmitted to the interior of the vehicle through the tires, suspension and vehicle body and causes noise. In order to avoid the feedback problem caused by the noise signal, the acceleration signal is usually used as the reference signal in the active control of road noise. The suspension structure is complex and directly connected to the body, which is the main transmission path of road noise, such as figure 1 shown. The working condition of the active end of the suspension is bad, and the reference point is usually arranged at the passive end of the front and rear suspensions, that is, figure 1 Body attachment point locations in . The layout of the reference points should try to cover the noise transmission path on the front and rear suspensions.

[0053] The reference-response relationship of road noise conforms to the law of multiple-input single-output linear system. figure 2 is the reference-r...

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Abstract

The invention relates to a reference signal selection method for automobile road noise active control. The reference signal selection method comprises the following steps: step 1, determining main noise peak values: selecting K main noise peak values and corresponding frequencies; 2, optimizing the position of a reference point: sorting the reference signals according to a constant coherence coefficient for each frequency; and 3, optimizing the number of the reference points: determining the optimal number of the reference points corresponding to each frequency according to the multiple coherence coefficient increment, and determining the optimal number of the reference points of the full frequency band by utilizing a multiple coherence function, thereby obtaining available reference signals. According to the invention, the method for selecting the reference signals for active control of road noise is systematically explained, the optimization of the positions and the number of the reference signals can be obtained, and the defects in the prior art are overcome.

Description

technical field [0001] The invention belongs to the field of noise and vibration control, in particular to a reference signal selection method used in the active control of vehicle road noise. Background technique [0002] Vehicle noise mainly comes from engine radiation noise, motor electromagnetic noise, road noise, aerodynamic noise, intake and exhaust noise, and transmission system noise. The commonly used noise control technology is passive isolation technology, such as increasing structural damping, laying sound-absorbing materials, etc. These technologies have a certain effect on controlling the mid- and high-frequency noise in the car, but the suppression of low-frequency noise is not satisfactory. In this case, active noise control technology came into being. [0003] The suppression effect of active noise control technology on low-frequency noise is particularly obvious. It uses additional sound sources to artificially and targetedly generate an acoustic signal w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F17/16
CPCG06F17/16G06F2218/10G06F2218/02Y02T90/00
Inventor 琚林锋彭博范佳亮韩强郑四发
Owner AUTOMOBILE RES INST OF TSINGHUA UNIV IN SUZHOU XIANGCHENG
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