Electromechanical hydraulic mount

A hybrid electromechanical hydraulic engine mount design is proposed. The traditional single pumper hydraulic engine mount design consists of two chambers and an inertia track connecting the two chambers, but in the hydraulic mount design of this paper, only the top chamber is filled with a fluid thus fluid never enters the bottom chamber. A piston with graphite filled PTFE seals separates the top chamber from the bottom chamber. The piston, placed in the inertia track, is supported by a metal spring and a long stroke linear voice coil. The voice coil is connected to an RLC circuit with a variable capacitance. The electronics are used to vary the location of the notch frequency, when desired. Equations of the motion for this hybrid electromechanical hydraulic engine mount design are derived using bond graph modelling technique. Simulation results clearly indicate that the proposed hydraulic mount design concept is feasible when mount input displacement are small. In this new hydraulic mount design, the notch frequency can be varied using a variable capacitance.