Design optimization of a giant magnetostrictive driving system for large stroke application considering vibration suppression in working process

Abstract

Light weight and low energy consumption of giant magnetostrictive driving system (GMDS) signify two main challenges facing in aerospace engineering, which conflict with the capability of the GMDS to some extent. For aim of addressing this dilemma, meanwhile realizing a large stroke and passive vibration suppression in space environment, this article proposes a GMDS scheme consisted of giant magnetostrictive actuator and compliant amplification mechanism, and moreover introduces a new design optimization strategy. First, a novel GMDS is proposed for realizing those functions. Then, three sectors, namely the electromagnetic conversion sector, the magnetic energy transfer sector and the magneto-mechanical conversion sector, are divided according to energy flow structure theory, to accurately evaluate the energy consumption. Therefore, the key energy consumption model of each sector could be formulated clearly by the aid of equivalent circuit diagram, equivalent magnetic circuit diagram and work-energy theory. Afterward, the equivalent vibration suppression natural frequency model of the compliant amplification mechanism is formulated through pseudo-rigid-body model method (PRBM), for evaluating the vibration suppression capability. Next, the equivalent mass of the whole system could be constructed on basis of the key components parameters. Finally, the design optimization strategy is proposed and implemented to capture the global optimal solution. Additionally, the performance of the optimized GMDS is validated by finite element analysis and experimental tests.