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为满足新型电液伺服阀的驱动要求,设计了柔性铰链放大的叠堆式超磁致伸缩致动器(FASGMA),建立了FASGMA输出位移模型,并进行了实验验证和分析。首先,根据传统GMA偏磁施加方式的特点和不足,采用永磁体和GMM棒交替排布的结构形式,设计了叠堆式超磁致伸缩致动器(SGMA),并利用柔性铰链机构放大其输出位移;然后,根据SGMA的结构特点,建立了反映轴向分布不均匀性的SGMA应变模型;接着,利用力学基本原理和有限元法对柔性铰链机构的放大比和固有频率进行了分析,提出了结构优化设计的方法,完成了放大机构的结构参数的确定;在此基础上,考虑SGMA与放大机构的相互作用以及SGMA轴向应变分布规律,建立了FASGMA多自由度位移模型,确定了自由度的合理取值;最后,搭建了FASGMA测试系统,进行了阶跃和正弦激励实验,完成了模型验证。结果表明:实验效果与模型计算结果吻合,证明了模型的准确性;在阶跃激励下,FASGMA最大位移约为130μm,响应时间约为70ms;正弦激励下,FASGMA工作频带为60Hz,对激励信号有较好的跟随特性。
In order to meet the requirements of the new electro-hydraulic servo valve, a stack-type giant magnetostrictive actuator (FASGMA) with a flexible hinge was designed. The FASGMA output displacement model was established and verified by experiments. First of all, according to the characteristics and disadvantages of the traditional GMA biasing method, a stack type giant magnetostrictive actuator (SGMA) is designed by using alternating arrangement of permanent magnets and GMM rods, and the flexible hinge mechanism is used to enlarge the structure Then the SGMA strain model reflecting the axial distribution inhomogeneity is established according to the structural characteristics of SGMA. Then, the magnification ratio and natural frequency of the flexible hinge mechanism are analyzed based on the mechanics principles and the finite element method Based on this, taking into account the interaction between SGMA and the magnifying mechanism and the axial strain distribution of SGMA, a FASGMA multi-degree-of-freedom displacement model was established to determine the freedom Finally, a FASGMA test system was built, and step and sine excitation experiments were carried out to complete the model verification. The results show that the experimental results are in good agreement with the model results and the accuracy of the model is verified. Under the step excitation, the maximum displacement of FASGMA is about 130μm and the response time is about 70ms. Under the sine excitation, the FASGMA operating frequency band is 60Hz, Have better follow characteristics.