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29 July 2004 Semiactive vibration isolation of a rigid platform using smart actuator
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A rigid platform mounted on four supports is modeled with heave, pitch and roll motions as the three degrees of freedom. The stiffness of each support is varied independently depending upon the condition function. Two stiffness values are possible at each support. As long as the absolute value of the relative velocity across the support is greater than a design value, the actuator is switched off. Spring loaded friction pads are in contact and the two springs act in parallel to increase the stiffness of the support. When the relative velocity is close to zero, the actuator is switched on. The friction pads lose contact and only one spring of the support will be effective. The actuator develops the required force that overcomes the torque produced by the torsion spring. The torsion spring develops the necessary normal force at the friction pads that acts normal to the sliding surfaces of the spring and the base in order to produce the necessary coulomb friction for locking one of the springs with the base thus altering the stiffness. A mathematical model is developed to study the performance of the proposed model. The simulation results show that the proposed scheme is very effective in reducing the vibration levels on the platform for harmonic base inputs.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yerrapragada Krishna and B. S. Sarma "Semiactive vibration isolation of a rigid platform using smart actuator", Proc. SPIE 5388, Smart Structures and Materials 2004: Industrial and Commercial Applications of Smart Structures Technologies, (29 July 2004);

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