Steady‐State Fuzzy Modeling of Ultrasonic Motor System

Abstract

Because of the complicated energy conversion process, ultrasonic motor has remarkable nonlinearity. Therefore, it is difficult to achieve accurate speed control of ultrasonic motor. In general, a good model is the foundation of the accurate control effect. Because of the remarkable non-linearity of ultrasonic motor, the model should also be nonlinear. In this paper, the two-input and one-output steady-state model of ultrasonic motor system is worked out using fuzzy reasoning modeling method. Comparison between experimental data and calculated data of the model prove that the model can well simulate the nonlinear relationship among the amplitude of driving voltage, frequency, and rotating speed.

A Two-Stage Fuzzy Logic Control Method of Traffic Signal Based on Traffic Urgency Degree

“…A fuzzy system is a classical artificial intelligent technology using fuzzy logic to solve problems in many fields. It has been applied successfully in many control systems, such as robot control, traffic signal management, industrial control, and home appliances, where traditional modeling techniques and controllers do not usually provide satisfactory system performance [2][3][4][5][6].…”