ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Generation of multi-input multi-output non-Gaussian driving signal based on inverse system method
Received date: 2015-07-10
Revised date: 2016-02-13
Online published: 2016-02-24
Supported by
Aeronautical Science Foundation of China (20140241002);A Project Funded by the Priority Academic Program Development of Higher Education Institutions of Jiangsu Province
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.
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 . DOI: 10.7527/S1000-6893.2016.0039
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