A position synchronization control for HA/EHA system

Moving towards more electric aircraft, a hybrid configuration of actuators gives us an opportunity to introduce electro-hydrostatic actuators in the primary flight control system. Hybrid configuration gives birth to force fighting problems that must be addressed. Force fighting will occur when both actuators are actively controlled. This paper presents different strategies for position synchronization of hybrid configuration involve HA and EHA in active/active mode. First a model is made and its accuracy is checked in mat lab\Simulink. Then four position synchronization strategies have been presented. The first one uses a PID controller to balance position loop dynamics. Second strategy uses self-tuning Fuzzy PI controller to control position loop dynamics and PID controller to improve load rejection performance. The third and fourth uses PID for position loop dynamics and Pre-compensators to equalize force dynamics. It has found that every strategy is better, according to its own desired application. Every strategy has its own advantage and disadvantage. However the PID controller strategy is better with respect to property of Segregation and HA Pre-compensator strategy is better with respect to reduction in force fighting. Self-tuning fuzzy PI controller strategy and EHA compensator strategy are better with respect to efficiency (making EHA faster improves efficiency of the system) of the system.