Title: Modelling and optimisation of a five dimensional vibration isolator

Authors: Bing Li; Jiankun Liu; Zhendong Song; Ying Hu

Addresses: Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China; State Key Laboratory of Robotics and Systems, Harbin Institute of Technology, Harbin, 150080, China ' Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China; State Key Laboratory of Robotics and Systems, Harbin Institute of Technology, Harbin, 150080, China ' Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China; State Key Laboratory of Robotics and Systems, Harbin Institute of Technology, Harbin, 150080, China ' Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518067, China

Abstract: A parallel mechanism with five degrees of freedom used as an active vibration isolator to isolate the vibration between devices installed on a mobile carrier is presented. The kinematic and dynamic analysis of the vibration isolator is carried out first. A wide-range magnetostrictive actuator composed of a giant magnetostrictive actuator and a microdisplacement amplification mechanism is designed for the actuation of the isolator. The magnetostrictive Terfenol-D is used as the active element of the giant magnetostrictive actuator. The microdisplacement amplification mechanism is a flexure hinge with a differential amplification principle. The transfer function from electric current to displacement is derived. The modal analysis of the parallel mechanism indicates that this parallel mechanism is suitable for active vibration isolation. The proportional-integral-derivative control method is used to adapt to the vibration environment. Finally, an optimal analysis for the entire vibration isolation system is performed and better vibration isolation effects are achieved.

Keywords: active vibration isolation; parallel mechanisms; Newton-Euler approach; PID control; modelling; optimisation; 5D vibration isolators; mobile carrier; kinematic analysis; dynamic analysis; magnetostrictive actuators; microdisplacement amplification; modal analysis.

DOI: 10.1504/IJMPT.2016.076420

International Journal of Materials and Product Technology, 2016 Vol.53 No.2, pp.171 - 186

Available online: 05 May 2016 *

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