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An active engine mount using a piezo actuator for a large vibrational amplitude is discussed. As a piezo actuator has a small displacement, the active mount requires a mechanism to increase the displacement of the piezo actuator to sufficiently counteract vibration. This paper describes in detail the construction of the prototype and the background theory from which the increase in displacement was achieved. Secondary, it describes a proving test performed on an experimental device that simulates the transfer of vibration from the engine to the chassis through the piezo active mounts. Finally it reports the decrease in floor vibration achieved when a piezo active mount was installed on an experimental vehicle.

This paper describes the development of a high performance hydraulic strut mount, which has low complex stiffness at high frequency range. To improve vehicle noise and vibration, the dynamic characteristics of the hydraulic mount were enhanced. A hydraulic chamber model was applied in the design of the strut mount which has low complex stiffness at high frequency range. A high performance hydraulic strut mount with the inner orifice is designed by applying the result of the analysis of a hydraulic chamber model and experimentally measured data. A well designed hydraulic strut mount reduces road noise for front wheel drive car.