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为提高射流伺服阀的动态性能,设计了采用桥式微位移放大机构的射流伺服阀用放大型超磁致伸缩执行器(AGMA)。建立了计输入位移损失的放大机构模型以及非线性位移输出理论模型,并采用有限元法对所建放大机构模型进行了对比验证,结果表明:放大机构的输入刚度模型最大误差<0.78N/μm,放大倍数模型最大误差<0.22,放大倍数受输入位移影响较小。最后,试验研究了AGMA的静动态特性,结果显示:控制电流在-0.5A到0.5A缓慢变化时,AGMA输出位移约为78μm;当控制电流从-0.5A跃变到0.5A时,其峰值位移约为71μm,峰值时间约为0.014s,调节时间小于0.1s;当控制电流幅值为0.5A时,其输出位移幅频宽>40Hz,谐振频率约为30Hz。
In order to improve the dynamic performance of jet servo valve, an enlarged giant magnetostrictive actuator (AGMA) for jet servo valve with bridge micro-displacement amplification mechanism was designed. A model of amplifying mechanism with input displacement loss and a theoretical model of nonlinear displacement output are established. The finite element method is used to verify the model of the magnified mechanism. The results show that the maximum error of input stiffness model is <0.78N / μm , The maximum error of the magnification model <0.22, magnification less affected by the input displacement. Finally, the static and dynamic characteristics of AGMA are studied experimentally. The results show that the output displacement of AGMA is about 78μm when the control current changes slowly from -0.5A to 0.5A. When the control current jumps from -0.5A to 0.5A, the peak value The displacement is about 71μm, the peak time is about 0.014s, and the adjustment time is less than 0.1s. When the control current amplitude is 0.5A, the amplitude of output displacement is> 40Hz and the resonance frequency is about 30Hz.