磁致伸缩作动器的参数振动问题
收稿日期: 2013-01-15
修回日期: 2013-05-02
网络出版日期: 2013-05-09
基金资助
国家自然科学基金(91016006)
Parametric Vibration in Magnetostrictive Actuator
Received date: 2013-01-15
Revised date: 2013-05-02
Online published: 2013-05-09
Supported by
National Natural Science Foundation of China (91016006)
李琳 , 薛铮 , 景旭贞 . 磁致伸缩作动器的参数振动问题[J]. 航空学报, 2013 , 34(10) : 2427 -2434 . DOI: 10.7527/S1000-6893.2013.0250
Elastic modulus E of giant magnetostrictive materials changes with themagnetic field and the stress, which is known as the ΔE effect. This paper proposes a dynamic model of magnetostrictive actuator that takes into consideration the ΔE effect. The feature of the model is the existence of both parametric excitation and external excitation, which is different from ordinary parametric vibration or forced vibration. The perturbation method is applied to solve and analyze the model. The spectrum charateristics and resonance frequency of parameter vibration are obtained. The danger of such structures under excitation of sub-harmonic resonance is analyzed by means of stability analysis in combination with an analysis based on the stability theorem considering external excitation. The amplitude of sub-harmonic resonance is considered when the frequency of the driving current is equal to 1/2 inherent frequency of the actuator. The conclusions obtained can be used as reference in the design of giant magnetostrictive actuators and smart structures with magnetostrictive materials.
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