Analysis and Dynamic Testing of the Systems Using Magnetostrictive Materials

• Main Authors: Chang, Chih-fu, 張志福
• Other Authors: Fu-shin Lee
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/95700719081175079709

碩士 === 華梵工學院 === 機械工程學類 === 85 === ABSTRACT The object of this thesis is to establish a small signal dynamic model for magnetostriction actuator systems using Finite Element Method (FEM). The mathematical model for the actuator systems is wholly based upon the interactions among distributed magnetic, electric, an mechanical energetic domains within the systems and the discretization method in FEM. The first step in the procedure is to investigate the statically distributed magnetic flux due to the magnetic bias from a permanent magnet, and to determine the magnetostrictve coefficients of Terfenol-D actuator. Then, the small signal model for the magnetostrictive actuator systems can be developed, and the time response for the dynamically distributed magnetic flux, actuator displacements, and the dependence with the magnetostrictive coefficient can be obtain during simulations. Also, the bandwidth for the analyzed actuator system is more than 100Hz, and the result of frequency response is very close to the result documented in the literature. In addition, a simple PI controller is used in the close loop actuator system, and the effectiveness of precision positioning based up the developed magnetostrictive actuator model is showed. In conclusion, the developed model in this thesis has a major impact for effective design and utilization of magnetostrictive actuators in precision systems.