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Correction method and device for combined sound source noise signal

A technology of noise signal and sound pressure signal, which is applied in the field of correction of combined sound source noise signal, can solve the problem that the working frequency range of the noise signal of the test bench cannot cover the test frequency band, etc.

Active Publication Date: 2019-06-21
WUHAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0007] The embodiment of the present application solves the problem that the operating frequency range of the noise signal of the existing muffler transmission loss test bench cannot cover the entire test frequency band by providing a correction method and device for the combined sound source noise signal

Method used

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  • Correction method and device for combined sound source noise signal
  • Correction method and device for combined sound source noise signal
  • Correction method and device for combined sound source noise signal

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Embodiment Construction

[0043] The invention provides a correction method and device for the noise signal generated by the combination of the low-frequency and intermediate-frequency sound sources, and provides the noise signal with wide frequency band, high sound pressure level and stable fluctuation to the comprehensive performance test bench of the muffler.

[0044] In the present invention, the impedance tube is used to measure the acoustic impedance of the transition connecting pipe, and according to the transfer matrix of the transition connecting pipe, the nozzle noise output by the random white noise as the excitation source is used as the output sound pressure signal to obtain the input sound pressure signal of the combined sound source system, Eliminate the problem of random fluctuations in the spectral characteristics of the output noise signal due to changes in the acoustic impedance at the connection between the transitional connecting pipe and the combined sound source system, and then co...

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Abstract

The invention belongs to the technical field of digital signal processing, and discloses a correction method and device for a combined sound source noise signal. The method comprises the following steps: acoustic impedance of a transition connection tube is measured through an impedance tube; a noise signal of a combined sound source system is corrected according to a transfer matrix of the transition connection tube; and wherein the combined sound source system comprises a low frequency loudspeaker and an intermediate frequency loudspeaker. The device includes the combined sound source system, the transition connection tube and the impedance tube; and the combined sound source system is vertically disposed on the impedance tube through the transition connection tube. The method and the device solve the problem that a working frequency range of the noise signal of an existing muffler transmission loss test bench cannot cover an entire test frequency band, and can output the noise signal with a wide frequency band, a high sound pressure level and stable fluctuation.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a method and device for correcting combined sound source noise signals. Background technique [0002] The muffler acoustic test bench is the basic means to study the acoustic performance of muffler components. The sound source system, as the main excitation source of the acoustic performance test device of the muffler, is the basis for ensuring the accuracy of the test data. [0003] In the test, in addition to ensuring good sealing and low environmental noise, the sound source system should also have good acoustic characteristics, such as good frequency response, high signal-to-noise ratio, wide test frequency band and The ability to preserve linear time-invariant systems, etc. Therefore, it is very important to design a sound source system that meets the acoustic performance requirements and ensures stable noise signal output in a wide frequency range. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01H17/00
Inventor 卢炽华谢丽萍刘志恩朱亚伟彭辅明陈弯付友明
Owner WUHAN UNIV OF TECH
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