Investigation of Active Vibration Isolation on Nonlinear Diesel Two-stage Vibration Isolation System
XIAO Bin1, GAO Chao1, ZHANG Ai-ping1, LIU Zhi-gang2
1.School of Energy and Power Engineering, Northeast Dianli University, Jilin, 132012, China
2. College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China
For diesel two-stage vibration isolation system, when considering that heavy nonlinearity of the secondary path influence dynamical system modelling, vibration analysis as well as active control strategy designing and its control performance, in this paper a hybrid adaptive control strategy is presented by integrating adaptive notch filter algorithm with Model Reference Adaptive Inverse Control with Pre-Compensator (PCMRAIC). In active vibration isolation experiment of diesel two-stage vibration isolation system, based on decoupling Hammerstein nonlinear system and analyzing the Generalized Frequency Response Functions (GFRFs), linearized reference models and phase curves of the secondary path were yielded, and then the hybrid adaptive control strategy was investigated, whose results showed that, the linearized reference model that approximated the aimed nonlinear system can be employed to realize excellent linearization of system and to provide accurate phase curves of the secondary path, therewith the linearized reference model and FIR model of its phase curve fitting codetermine performance of the hybrid adaptive control strategy. In addtion, the results of active vibration isolation experiment were compared with vibrational energy modeling, which showed that the optimal isolation effect in vibrational energy level is obtained only when to eliminate nonlinarity and consequently to suppress harmonic vibration of the system.
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