A Simulation Method of Equivalent Acoustic Simulation Source

Abstract

The invention relates to a simulation method of an equivalent sound simulation source and belongs to the spacecraft vibration disturbance source sound simulation field. The method includes the following steps that: an original sound source is arranged in a microphone array, so that the sound pressure signals of each microphone can be obtained, fast Fourier transformation (FFT) is carried out on the sound pressure signals, so that the spectra of each microphone can be obtained, and the sound power energy and directional characteristics of the original sound source are obtained through further calculation; a proper number of loudspeakers are selected according to the directional characteristics of the original sound source, so that the equivalent sound simulation source can be established; the equivalent sound simulation source is arranged in the microphone array, and the driving voltage of each loudspeaker is obtained through testing, and the frequency-response function of each microphone can be obtained; the driving voltage of each loudspeaker on the equivalent sound simulation source for simulating the characteristics of the original sound source is determined through a frequency-domain reverse load identification method; and the driving voltage is outputted to the equivalent sound simulation source, so that the equivalent sound simulation source can emit sound, the noise signals on the microphone array around the equivalent sound simulation source are tested, the noise signals are compared with the signals of the original sound source, so that whether the equivalent sound simulation source can reproduce the characteristics of the original sound source can be verified.

Description

technical field [0001] The invention relates to the field of sound simulation of a spacecraft disturbing vibration source, in particular to a method for simulating an equivalent sound simulation source. Background technique [0002] When the satellite performs the micro-vibration test in the atmospheric environment, the noise generated by the original sound source is reflected and reverberated by the deck, and is amplified in the star structure, which will cause the measured micro-vibration signal to be falsely amplified. If the collected signal is data containing noise pollution, it may lead to wrong assessment of the impact of micro-vibration on imaging quality, and unnecessary design costs will be paid. [0003] There are differences in the performance of satellite micro-vibration performance in space and on the ground. In ground experiments, the disturbance source excitation of structural vibration can be divided into two parts. Part of it is the exciting force from st...

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Problems solved by technology

[0005] For the simulation of the directivity of the sound field, the traditional method is the wave superposition method, typically a stereo sound source. This method realizes the simulation of the directivity of the sound through the control of multiple speakers, but this method can only simulate the sound field characteristics of a specific position and cannot Realize full-field simulation of specific sound sources

Hu Ruimin et al. invented a method and device for reconstructing sound source direction and distance in a multi-channel system (CN201410071545.1). Four speakers are used to reconstruct the sound intensity and direction of a certain response surface at a specific position, but it cannot simulate the sound source. Omnidirectional near-field characteristics of the source

Xiang Yu et al. invented a sound field reconstruction method based on multi-spherical wave superposition method (CN201310726005.8). The continuous unknown source intensity and kernel function distributed on the virtual source surface are distributed along the circumferential and meridian directions using exponential Fourier order The expression of the two-dimensional fast Fourier transform of the radiation sound pressure in the external field of multiple virtual spheres is derived, so that the existing acoustic holographic calculation method based on the wave superposition method is suitable for plane measurement and measurement surfaces of arbitrary shapes, but it is not given The arrangement method of the acoustic excitation source cannot verify whether the compact arrangement of the sound source can be realized

Wang Yujiang and others invented a sound field reconstruction method (CN201310733451.1), which uses multi-sphere equivalent sources for omnidirectional near-field reconstruction, but has specific requirements for the position of multi-sphere virtual source strength, which cannot be applied to integrated Omnidirectional sound field simulation source

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