ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Non-Gaussian random vibration testing of MIMO narrowband on broadband
Received date: 2022-05-20
Revised date: 2022-07-14
Accepted date: 2022-08-15
Online published: 2022-08-31
Supported by
National Natural Science Foundation of China(12202187);China Postdoctoral Science Foundation(2022M721610);Jiangsu Funding Program for Excellent Postdoctoral Talent(2022ZB210)
Non-Gaussian random vibration control testing of multi-input multi-output narrowband on broadband is proposed. Firstly， the relationship among the random phase， skewness and kurtosis of non-Gaussian random signals is analyzed， and an iteration phase adjustment method is proposed for rapid generation of non-Gaussian random signals with specified skewness and kurtosis. Secondly， the non-Gaussian random signals of multi-channels are decoupled and generated by the uncorrelation characteristic of the random phase among different channels. Taking the generated non-Gaussian random signals as the output responses， we then obtain the driving signals by the time domain inverse system method for vibration testing. The control algorithms are used to correct the PSDs， skewness and kurtosis of the response signals. Finally， the feasibility of the proposed method is verified by tri-axial shaker testing. The results show that the PSDs at the control channels can be controlled within the specified references. Meanwhile， the skewness and kurtosis of response signals in the time domain also meet the given references.
Yi MA , Xudong HE , Huaihai CHEN , Ronghui ZHENG . Non-Gaussian random vibration testing of MIMO narrowband on broadband[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(8) : 227475 -227475 . DOI: 10.7527/S1000-6893.2022.27475
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