Research on dynamic variable structure control strategy for high-speed electronic shogging motion on warp knitting machine

Servo system based on the position control achieves higher precision,but action response is slow,and servo system based on the speed control has good response performance,but is easy to produce position overshoot,and its positioning accuracy is poor.Because the single control structure is difficult to meet the requirements of high speed and high precision electronic shogging control on warp knitting machine,this paper proposes a kind of variable structure control strategy,that is,based on the rotarion speed of the main shaft and lapping number,the high frequency response characteristics of the speed control is utilized to start the guide bar and,the high precision positioning properties of the position control is used to stop the guide bar,real-time combining the speed control with position control in one shogging motion to conduct dynamic switching;the quick adjustment of motor speed far from the slot needle acquires the subsequent shorter positioning setting time;and the dynamic real-time variable structure control can ensure that the rapid response and precise positioning of the system is synchronous.The test of written algorithm on DSP system has proven that the dynamic variable structure control strategy can well improve the control performance of high-speed electronic shogging on warp knitting machine.