An effective hydraulic engine mount (HEM) should acquire a high dynamic stiffness (storage and loss) at low frequency, and low dynamic stiffness at high frequency. A passive hydraulic engine mount which can achieve this hard/soft dynamic stiffness requirement is proposed. Three new approaches are adopted in the proposed HEM: elimination of the decoupler, application of a hyperbolic flexible-matrix-composite pumping chamber, and employment of two oppositely connected identical HEM. The working principle of the proposed HEM is explained, the mathematical model is introduced, and the effect of the various physical parameters of the physical model on the dynamic stiffness are presented. It is shown that the proposed HEM can achieve the hard/soft requirement over a specific frequency range.
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