Cabin structure vibration response reproduction method

A technology for structural vibration and cabin, which is applied in special data processing applications, complex mathematical operations, measuring devices, etc., to achieve the effect of simple method

Pending Publication Date: 2019-12-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Cabin structure vibration response reproduction method
  • Cabin structure vibration response reproduction method
  • Cabin structure vibration response reproduction method

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Embodiment Construction

[0037] refer to figure 1 The described stages further describe the method of the present invention: the selected vibration reproduction area is the key vibrating wall plate whose contribution to the sound field is outstanding at the outer boundary of the cabin.

[0038] Step 1: Firstly, the vibration signals of various positions in the reproduced cabin structure must be obtained. Evenly select M positions on the inner surface of the selected wall panel of the cabin to arrange acceleration sensors, and mark the positions of each sensor as (x m ,y m ,z m ) (m=1,2,...,M), turn on all equipment and sound sources, set the sampling frequency of the collected time-domain signal to 32kHz in the stable state of the equipment, and record it, the collected signal is recorded as a i (t)(i=1,2,...,M), the recording time is 30s. Perform short-time Fourier transform on each saved data to obtain the frequency domain representation of each microphone signal a i (f) (i=1,2,...,M). Inside th...

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Abstract

The invention discloses a cabin structure vibration response reproduction method, and belongs to the technical field of cabin structure vibration and noise reduction. The method comprises the following steps of firstly, assuming that the impact response between a measured vibration exciter or actuator and each receiving position is a linear time-invariant system, based on the hypothetical, measuring the impulse responses of the plurality of vibration exciters and the receiving positions by using a linear sweep method; after the impulse response is obtained, taking the collected data of the multiple vibration sensors installed on the surface of the structural wall as the input, and through a deconvolution model matched with the acceleration, solving the driving signals of all the vibrationexciters during vibration reproduction. According to the method, the plurality of excitation devices are arranged outside the structure to equivalently reproduce the structural vibration condition ofa sound field of the original cabin so as to better reproduce the original sound field. According to the theory of vibration and sound radiation, in a low-frequency range, the method can accurately reproduce the vibration distribution of the sound field of the original cabin.

Description

technical field [0001] The invention belongs to the technical field of cabin structure vibration reduction and noise reduction, and relates to a vibration reproduction method, in particular to a method for reproducing the vibration response of a cabin structure based on data collected by multiple sensors. question. Background technique [0002] The document "Time Domain Deconvolution Method in Indoor Sound Field Reproduction" describes a method of sound field reproduction. This method is based on loudspeakers to reproduce the sound field in the original car body. It is a technology to simulate the original sound field. The main principle is to record the original The sound pressure information of multiple positions in the space, and then set a fixed position and number of speakers, calculate the drive signal of each speaker and play it to reproduce the original sound field. In this method, the information of the original sound field is equivalent to the superposition of mul...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F17/16G01H17/00
CPCG06F17/16G01H17/00
Inventor 曾向阳刘延善晋安其王海涛周治宇
Owner NORTHWESTERN POLYTECHNICAL UNIV
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