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Study on the dynamic characteristics of a high frequency brake based on giant magnetostrictive material

机译：基于超磁致伸缩材料的高频制动器的动力特性研究

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摘要

In order to meet the requirements of rapid and smooth braking, high-frequency braking using a giant magnetostrictive actuator is proposed, which can solve the problems in hydraulic braking, such as, it leaks easily, catches fire easily, is difficult to find failures, high cost on maintenance and repairing, etc. The main factors affecting the force of a high-frequency braking actuator are emphatically analyzed, the brakes dynamic model is established and a performance testing device for high frequency braking is constructed based on LabVIEW. The output force of the actuator increases with the excitation current of the driving coil increasing, and the increased multiple of the output force is greater than that of the excitation current; the range of the actuator force amplitude is 121.63 N similar to 158.14 N, which changes little, while excitation frequency changes between 200 Hz similar to 1000 Hz. In a minor range of pre-stress, the output force decreases with an increase in the axial pre-stress of the giant magnetostrictive rod, but is not obvious. It is known by finite element simulation analysis that high-frequency braking shortens the braking displacement and time effectively, which proves the feasibility and effectiveness of high frequency braking. Theoretical analysis and experimental results indicate that the output force of the actuator changes at the same frequency with excitation current; it is controllable and its mechanical properties meet the requirements of high frequency braking.
机译：为了满足快速平稳制动的要求，提出了使用巨型磁致伸缩致动器的高频制动，它可以解决液压制动中容易泄漏，易着火，难以发现故障，着重分析了影响高频制动执行器力的主要因素，建立了制动动力学模型，并基于LabVIEW构建了高频制动性能测试装置。致动器的输出力随着驱动线圈的励磁电流的增加而增加，输出力的增加倍数大于励磁电流的增加倍数。执行器力幅度的范围是158.14 N，类似于121.63 N，变化很小，而激励频率在200 Hz和1000 Hz之间变化。在较小的预应力范围内，输出力随巨型磁致伸缩杆的轴向预应力的增加而减小，但并不明显。通过有限元仿真分析可知，高频制动有效地缩短了制动位移和时间，证明了高频制动的可行性和有效性。理论分析和实验结果表明，执行器的输出力在相同频率下随励磁电流变化。它是可控的，其机械性能满足高频制动的要求。

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