Numerical simulation of the control strategy for large hydraulic centrifuge shaker

The centrifuge shaker is considered as one of the advanced equipments in the geotechnical anti-earthquake field. The control strategy of centrifuge shaker is numerically simulated in this paper, which mainly focuses on the particularity of centrifuge shaker systems and the feature of their reference signals. A non-linear coupling model of the hydraulic actuator unit is firstly established for the experimental prototype of centrifuge shaker by integrating four non-linear factors into the previous presented linear coupling model. Then, the function of every component of the centrifuge shaker's servo control strategy is briefly introduced. Especially, the performance improvement of the system with feedforward compensation is comprehensively examined when we introduce a band pass filter as the feedforward controller. With consideration of the reference signal's particular feature (short duration and high frequency), the convergence precision and convergence speed of the off-line iteration algorithm are finally evaluated for different NFFT and different error correction coefficients. After the whole numerical simulation, we conclude that the whole off-line iteration process is optimal when NFFT=512 and, α=0.5, and the convergence precision is reduced to 5% after the fourth iteration.