Random wave replication control method research on variable stiffness loading system

This paper presents a random wave reproduction control method based on time domain, for the shortcomings of traditional identification method of frequency response function existing in the application of variable stiffness load movement. The control system uses adaptive inverse modeling techniques. And according to the system input and output, a recursive algorithm RLS (recursive least-squares) of the adaptive transversal filter is designed on the basis of least squares algorithm. These can make the system adapt system identification online, and adjust the weight vector of the transversal filter according to identification results, thus controlling the system input and making the system achieve the waveform reproduction. Through simulation analysis, the method is verified feasible, as well as their respective advantages and disadvantages are given by comparing this method with the traditional iterative control method of frequency response function. Since the adaptive inverse control has the characteristics of automatically adapting the parameter variations of load and the control system, which is extremely suitable for the system with non-linear characteristics.