关键词: 多点激励, 实时更新, 正弦试验, 最优控制

Abstract: The optimum control strategy of the system is presented in order to tackle the drawbacks appeared in the traditional multi-exciter sine control method where the un-updating of frequency response property and constant step of convergent iteration leading to potential instability of the system exists. The fundamental reasons for the error estimation of frequency response matrix have been found out through implementing research to the system stability of the multi-exciter sine vibration control and analysis to the factors influencing system stability. The real-time updating formula for system coupling compensation matrix and the steepest convergence step formula for the control system are inferred by analyzing the optimum model established, meanwhile, optimum control flow chart of the multi-exciter sine control is introduced. The results of simulation show that iterative step dominates the factor in affecting the control system stability, and the multi-exciter sine optimum control strategy bears the steepest convergence. The experiment indicates that the error between the output response spectrum and reference spectrums for the control system can be completely satisfied in terms of the requirement with ±3 dB in Engineering, and good phase tracking capability is also possessed, consequently, both of them will bring the practical value in engineering

Key words: Multi-exciter, Optimum control, Real-time updating, Swept-sine test