Parametric Design and Multiobjective Optimization of Maglev Actuators for Active Vibration Isolation System

Qianqian Wu,Rongqiang Liu,Zongquan Deng,Honghao Yue,Liang Ding

doi:10.1155/2014/215358

Qianqian Wu, Rongqiang Liu + Show 3 more

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https://doi.org/10.1155/2014/215358

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Abstract

The microvibration has a serious impact on science experiments on the space station and on image quality of high resolution satellites. As an important component of the active vibration isolation platform, the maglev actuator has a large stroke and exhibits excellent isolating performance benefiting from its noncontact characteristic. A maglev actuator with good linearity was designed in this paper. Fundamental features of the maglev actuator were obtained by finite element simulation. In order to minimize the coil weight and the heat dissipation of the maglev actuator, parametric design was carried out and multiobjective optimization based on the genetic algorithm was adopted. The optimized actuator has better mechanical properties than the initial one. Active vibration isolation platforms for different-scale payload were designed by changing the arrangement of the maglev actuators. The prototype to isolate vibration for small-scale payload was manufactured and the experiments for verifying the characteristics of the actuators were set up. The linearity of the actuator and the mechanical dynamic response of the vibration isolation platform were obtained. The experimental results highlight the effectiveness of the proposed design.

Highlights

With the increasing requirement for higher accuracy in science activities, higher environment quality is demanded
The maglev actuator based on the Lorentz force was designed to obtain good linearity
Finite element method (FEM) simulation results showed that the actuator can produce a strong and uniform magnetic flux density and the magnetic flux density within the boundaries of the permanent magnets can be considered as a constant value

Summary

Introduction

With the increasing requirement for higher accuracy in science activities, higher environment quality is demanded. The microvibration, occurring in low-frequency range, has a serious impact on science experiments on the space station or the staring image quality and gravity gradient measurement of high resolution satellites. The vibration isolation platform used to isolate microvibration is needed to provide an ideal environment for space missions. Due to the extremely small stiffness needed to isolate such low-frequency base disturbances, active vibration isolation offers significant advantages over passive systems [2]. The active vibration isolation has the characteristics of strong adaptability and lightweight, based on which it is feasible to realize precise pointing and clear image of new generation satellites [3]. Active microvibration isolation methods have garnered increasing attention due to their excellent properties

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