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The Study of Quasi-Zero Stiffness Vibration Isolation
Date Issued
2009
Date
2009
Author(s)
Chao, Wen-Yu
Abstract
Due to the development of micro fabrication techniques, modern instruments are miniaturized and operated at high speeds. In this case, the demand for vibration isolation is more and more strict. Traditional passive vibration isolators consist of a linear spring and a viscous damper. Previous studies indicate that the performance of a traditional vibration isolator is enhanced as the stiffness of the associated spring approaches zero. The drawback of zero stiffness is that the system cannot sustain any disturbance. The quais-zero stiffness (QZS) system provides a feasible solution to this problem. The QZS system is a nonlinear system which has zero stiffness at the working position and also provides large restoring force away from the working position. This thesis investigates a feasible design of QZS mechanism. The effects of system parameters on the equivalent stiffness of the system and the suitable range for QZS are studied thoroughly. We construct the theoretical model of the QZS vibration isolator and derive the governing equations. The effectiveness of the QZS vibration isolator for reducing the vibration and shock from the base is examined and compared with that of the traditional vibration isolator.
Subjects
quasi-zero stiffness
harmonic balance
vibration isolation
Type
thesis