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Multi-degree-of-freedom non-Gaussian random vibration control
Received date: 2016-05-20
Revised date: 2016-09-07
Online published: 2016-10-09
The drive signal and the response signal generated by traditional multi-degree-of-freedom (MDOF) random vibration control method are both Gaussian signal. However, the real vibration interference signal is always super-Gaussian, while sub-Gaussian random excitation is mainly used to reduce the maximum amplitude of the drive signal. To achieve MDOF sub-Gaussian and super-Gaussian vibration control, an MDOF non-Gaussian random vibration control method is proposed, which solve the coupling problem through system identification, and select special phase to generate non-Gaussian pseudo-random drive signal, and then the pseudo-random drive signal is transformed to real random non-Gaussian drive signal through time domain randomization. The sub-Gaussian and super-Gaussian experiments based on a Hexapod-based MDOF micro vibration test bed show that the response power spectral density (PSD) of response signals obtained by the proposed method are limited to ±3 dB error band of reference PSD. Compared to that in the Gaussian experiment, the drive signal in the sub-Gaussian experiment decreases by more than 20%. In the super-Gaussian experiment, the error between the kurtosis of response signal and the reference value is within 0.2. Effectiveness of the proposed method can be validated by the experiment results.
MENG Han , HUANG Hai , HUANG Zhou . Multi-degree-of-freedom non-Gaussian random vibration control[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(2) : 220458 -220465 . DOI: 10.7527/S1000-6893.2016.0253
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