Torsional vibration active control of hybrid construction machinery complex shafting

HU Qiong(胡琼)^{1, 2}, YANG Chun-hua(阳春华)², LIU Shao-jun(刘少军)^{1, 2}, ZHENG Hao(郑皓)^{1, 2}

(1. College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;
2. School of Information Science and Engineering, Central South University, Changsha 410083, China)

Abstract:Due to the coaxial connection of engine, motor and pump, the dynamic characteristics of hybrid construction machinery are changed, which generates a new torsional vibration problem of multi-power sources. To reduce the torsional vibration of the hybrid construction machinery complex shafting, torsional vibration active control was proposed. The three-mass model of coaxial shafting of hybrid construction machinery was established. The PID control and the fuzzy sliding mode control were chosen to weaken torsional vibration by controlling the motor speed and torque. The simulation results show that the fuzzy sliding mode control has 12% overshoot of the PID control when the engine torque changes. The active control is effective and can realize smooth power switch.

Key words:torsional vibration active control; hybrid construction machinery; electro-mechanical coupling; fuzzy sliding mode control