基于逆系统方法的多输入多输出非高斯驱动信号生成

doi:10.7527/S1000-6893.2016.0039

Abstract

Abstract:

The multi-input multi-output (MIMO) vibration environment test is a new method in the vibration testing area, which can replicate the vibration environment endured by a structure under the practical situation more accurately than the traditional single-input single-output (SISO) manner. The traditional random vibration test with frequency domain method aims to generate a stationary and Gaussian vibration environment. But the practical vibration environments are always non-Gaussian, which can cause different damages to the structures compared with Gaussian excitations. Thus, it is significant to study the MIMO non-Gaussian test method. The generation of the driving signals is the key in the vibration environment test. In this paper, a method for generating MIMO non-Gaussian driving signals based on inverse system and phase manipulation is proposed. First, phase manipulation is used to generate the pseudo random non-Gaussian responses according to the given reference power spectrum densities (PSD) and kurtoses. Then inverse system method is used to generate the pseudo driving signals. Finally, the real random non-Gaussian driving signals are obtained by time domain randomization. A two-input two-output cantilever beam model is selected as an example. The simulation results indicate that the error between the output response spectra and the reference ones meets the ±3 dB requirements in engineering practice and the values of kurtoses of the outputs are very close to the reference ones. Thus, the proposed method is valid.

Key words: vibration environment test, MIMO, power spectrum density, non-Gaussian, kurtosis, inverse system

CLC Number:

V216.5
O324

CHEN Huaihai, WANG Pengyu, SUN Jianyong. Generation of multi-input multi-output non-Gaussian driving signal based on inverse system method[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(5): 1544-1551.

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Generation of multi-input multi-output non-Gaussian driving signal based on inverse system method

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