In order to adapt the frequency requirements of fast switching valve applied to the digital hydraulic converter, a 2/2 way fast switching valve driven by giant magnetostrictive material was performed in this article. The finite element simulation of the fast switching valve’s electromagnetic field and flow field was carried out. In addition, the integrated analytical model of giant magnetostrictive material–fast switching valve coupling with enhanced transmission line method was built in MATLAB/Simulink. The displacement and pressure-flowrate characteristics of giant magnetostrictive material–fast switching valve were discussed and validated in the experiments. The results indicated that the nonlinearity magnetization presents a positive relationship with the driving current before it reaches the saturated state, and the hydraulic force at the expected opening is far less than output force caused by magnetostrictive strain. The experimental valve displacements are in good agreement with obtained results from analytical model, which reveals that the analytical model is accurate enough to predict the main performances of the fast switching valve. The maximum valve displacement without supply pressure is up to 68 µm, which attenuates moderately with the growth of supply pressure. The experimental responses of the displacement and the pressure of giant magnetostrictive material–fast switching valve are less than 1 ms. The amplitude of output flowrate is 8.1 L/min at the frequency of 100 Hz when the pressure drop across giant magnetostrictive material–fast switching valve is 6 MPa theoretically. Similarly, the maximum transient flowrate derived from experiments reaches 8.2 L/min at pressure drop across giant magnetostrictive material–fast switching valve of 5.9 MPa, which is basically consistent with that predicted by analytical model. These reveal that the giant magnetostrictive material–fast switching valve can be utilized in the digital hydraulic converter to improve the system’s efficiency.

中文翻译：

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数字液压转换器磁致伸缩快速切换阀特性研究

为了适应应用于数字式液压转换器的快速切换阀的频率要求，本文设计了一种由超磁致伸缩材料驱动的2/2路快速切换阀。对快速切换阀的电磁场和流场进行了有限元仿真。此外，在MATLAB/Simulink中建立了巨磁致伸缩材料-快速开关阀耦合增强传输线法的综合分析模型。在实验中讨论并验证了超磁致伸缩材料-快速切换阀的位移和压力-流量特性。结果表明非线性磁化强度与达到饱和状态前的驱动电流呈正相关，预期开口处的液压力远小于磁致伸缩应变引起的输出力。实验阀门位移与解析模型得到的结果非常吻合，表明解析模型的准确度足以预测快速切换阀的主要性能。无供气压力的最大阀门位移可达68 µm，随供气压力的增加而适度衰减。超磁致伸缩材料-快速开关阀位​​移和压力的实验响应小于1 ms。当超磁致伸缩材料-快速切换阀的压降理论上为6 MPa时，输出流量在100 Hz频率下的幅值为8.1 L/min。相似地，在超磁致伸缩材料-快速切换阀的压降为5.9 MPa时，实验得出的最大瞬态流量达到8.2 L/min，与分析模型预测的基本一致。这些表明巨磁致伸缩材料-快速切换阀可用于数字液压转换器以提高系统效率。