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Modeling and Analysis for Amplified Giant Magnetostrictive Actuator Applied to Jet-pipe Electro-hydraulic Servovalve
Received date: 2014-05-04
Revised date: 2014-06-10
Online published: 2014-06-25
Supported by
National Natural Science Foundation of China (51175243, 5080508); Aeronautical Science Foundation of China (20110752006, 20130652011); Natural Science Foundation of Jiangsu Province (BK20131359)
In order to improve the dynamic performance of a jet-pipe electro-hydraulic servovalve, a novel bridge-type micro-displacement amplified giant magnetostrictive actuator (AGMA) for a jet-pipe electro-hydraulic servovalve is presented. The models considering the input displacement loss are deduced to describe the input stiffness and amplification ratio of the amplified mechanism. Then, the nonlinear dynamic model of AGMA is obtained. The above-mentioned models of the input stiffness and amplification ratio are verified by finite element analysis. The results show that the maximum error of input stiffness is less than 0.78 N/μm, the maximum error of amplification ratio is less than 0.22, and the effect of input displacement on amplification ratio is small. Finally, the experiment results show that the output displacement of AGMA is 78 μm at the control current slowly changing between -0.5 A and 0.5 A. However, when the control current steps from -0.5 A to 0.5 A, the peak displacement of AGMA is 71 μm with the peak time about 0.014 s and the settling time less than 0.1 s. The bandwidth is more than 40 Hz and resonant frequency is about 30 Hz at the control current's amplitude of 0.5 A.
ZHU Yuchuan , LI Yuesong . Modeling and Analysis for Amplified Giant Magnetostrictive Actuator Applied to Jet-pipe Electro-hydraulic Servovalve[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(11) : 3156 -3165 . DOI: 10.7527/S1000-6893.2014.0121
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