A control method of realizing negative stiffness of a specified amplitude is presented for an active suspension device with a linear actuator. It is shown that the derived formula is more general than the formula for zero-power control. The validity of the control method is checked experimentally with an apparatus equipped with a voice coil motor (VCM). A suspension device that has negative stiffness of a specified amplitude is actually realized by the proposed control method. The amplitude of negative stiffness is maintained even when the VCM is flexibly supported.

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