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In this work, we extracted the variation features and performed the pattern classifications for knee joint vibroarthro-graphic (VAG) signal processing. The signal turns count with fixed threshold and coefficient of variation (CV) of envelope energy were used to characterize the intrinsic oscillations of the VAG signals. The Kolmogorov-Smirnov test results indicated the pathological VAG signals possess...
This paper presents the dynamic modelling and control of a six degree-of-freedom (DOF) active vibration isolation system for high-precision equipment. First, the six DOF rigid body model of the system is developed. Then, the hybrid controller which is a combination of the feedback controller with the nonmodel based adaptive feedforward compensator is proposed. The feedback controller is based on absolute...
Vibration is one of the limiting factors to achieve ultra precision in ultra precision metrology or manufacturing equipments. In this paper, an active vibration isolation system using piezoelectric actuators for ultra precision equipment is presented. The effectiveness of the vibration suppression by piezoelectric actuators under different configurations is investigated numerically. The model reference...
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