In this paper we study image based visual servo (IBVS) control of a four rotor vertical takeoff and landing (VTOL) craft known as an X4-fEyer. The approach taken is tailored to planar visual targets and is based on a reformulation and extension of 2 2 0 image-based visual servo design [14, 11 to the control of dynamic under-actuated systems. Exponential stability of the closed loop system is pr...

A more robust servo control system using Sliding Mode Control to handle shock and vibration disturbances for optical disc drive systems is presented in the paper. An estimator-based SMC controller is used in the radial servoloop instead of the traditional PID controller. Simulation and experimental results show a significant improvement of the drive’s anti-shock performance in the radial direct...

Moving towards the more electric aircraft (MEA), a hybrid actuator configuration provides an opportunity to introduce electromechanical actuator (EMA) into primary flight control. In the hybrid actuation system (HAS), an electro-hydraulic servo actuator (EHSA) and an EMA operate on the same control surface. In order to solve force fighting problem in HAS, this paper proposes a novel linear exte...

The electrohydraulic servo variable speed volume pump control system (hereinafter referred to as ESPCS) is integrated with a permanent magnet synchronous motor motor), fixed-displacement pump, and hydraulic cylinder. By controlling the speed, output flow of can be controlled, displacement, force, Compared traditional electro-hydraulic valve system, ESPCS has advantages high power-to-weight rati...