Optimizing active control scheme of high-speed pantograph

A novel control scheme for the active suspension in a 4-DOFs pantograph is presented here. The concepts of force cancellation, Skyhook damper and track-following spring are jointly applied to establish an active vibration control system. A force cancellation control scheme is used to isolate the sprung masses. Skyhook damper is employed to form the sprung mass. Track-following springs are applied for the sprung mass to follow the variable of contact line. For efficiency, the process for design of the active suspension parameters of pantograph using the constrained multiobjective evolutionary algorithm is employed to search for the parameters like damping ratio and spring constant to achieve an optimum, trade off peak of contact force, suspension displacement and inertia force. Computer simulations are performed using MATLAB to verify the proposed control scheme model.