Compensation Method of Characteristic Nonlinearity on Control System

Typical characteristic nonlinearities include insensitivity, saturation, clearance and hysteresis, and various combinations of them, which have a great influence on the system in control systems. For example, Backlash nonlinearity of the reducers and gears has strong effect on the system in some electromechanical tracking systems. Due to the effect of backlash nonlinearity on quality and reliability of the system, many researchers have tried to find out its solutions. In this study, we performed theoretical considerations and simulations to compensate the effects of nonlinearities such as backlash, saturation, hysteresis, etc. present in the control system. This paper shows that, unlike the past linear approximation of the inherent nonlinearities present in control systems, it directly eliminates the inherent nonlinearities and is convenient for physical implementation. First, this paper shows the simple method of compensating nonlinearities by using direct coupling principle. Next, Feedback compensation method is introduced in the systems which involve the saturation nonlinearity element. Finally, through the experiment, the advantages of these methods are confirmed. This is a new approach for nonlinear compensation and more convenient and simpler to implement compared with the previous different control methods. It can also be used to overcome the effect of several nonlinearities in different control systems as well as in the primary static satellite system.