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首页> 外文期刊>Journal of intelligent material systems and structures >Comparison of Piezoelectric, Magnetostrictive, and Electrostrictive Hybrid Hydraulic Actuators
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Comparison of Piezoelectric, Magnetostrictive, and Electrostrictive Hybrid Hydraulic Actuators

机译：压电，磁致伸缩和电致伸缩混合液压执行器的比较

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摘要

In recent years, active material driven actuators have been widely researched for potential applications in the fields of aerospace, automotive, and civil engineering. While most of these active materials, such as piezoelectric, magnetostrictive, and electrostrictive materials, have high force and bandwidth capabilities, they are limited in stroke. In combination with hydraulic systems, the field-dependent motion of these materials can be amplified to produce high force, high stroke actuators. In a hybrid hydraulic pump, the motion of an active material is used to pressurize a hydraulic fluid. Since the properties of active materials vary greatly in terms of free strain and block force, there is a need to identify the optimum active material for a particular application. This study compares four active materials, Lead-Zirconate-Titanate (PZT), Lead-Magnesium-Niobate (PMN), Terfenol-D and Galfenol, as the drivers of a hybrid hydraulic actuation system. The performance of each of these active materials has been evaluated in the same hydraulic actuator through systematic testing of the actuator while maintaining the same length and volume for each active material. In each case, the active material has a length of around 54 mm and a cross-sectional area of 25 mm~2. Commonly used metrics such as output power and electromechanical efficiency are used for comparison. Of the four materials tested in this study, PMN presented the largest free strain (2000 us), while Galfenol presented the least (300με). The highest no-load velocity is also exhibited by the PMN-based actuator (270 mm/s). The maximum output power obtained is 2.5 W for both PMN and Terfenol-D-based actuators while the highest electromechanical efficiency obtained is 7% for the PMN-based actuator.
机译：近年来，针对航空航天，汽车和土木工程领域的潜在应用，已经对活性材料驱动的执行器进行了广泛的研究。尽管大多数这些活性材料（例如压电，磁致伸缩和电致伸缩材料）具有较高的作用力和带宽能力，但它们的行程受到限制。与液压系统结合使用时，这些材料的场相关运动可以被放大，以产生高力，高行程的执行器。在混合液压泵中，活性材料的运动用于对液压流体加压。由于活性材料的特性在自由应变和粘着力方面有很大的不同，因此有必要为特定应用确定最佳的活性材料。这项研究比较了四种活性材料，锆钛酸铅（PZT），铌酸铅镁（PMN），Terfenol-D和Galfenol作为混合液压驱动系统的驱动力。通过在相同的液压执行器中进行系统测试来评估每种活性材料的性能，同时保持每种活性材料的长度和体积相同。在每种情况下，活性材料具有约54mm的长度和25mm〜2的横截面积。比较常用的指标，例如输出功率和机电效率。在这项研究中测试的四种材料中，PMN表现出最大的自由应变（2000 us），而Galfenol表现出最小的（300με）。基于PMN的执行器也显示出最高的空载速度（270 mm / s）。对于PMN和基于Terfenol-D的执行器，获得的最大输出功率均为2.5 W，而对于基于PMN的执行器，获得的最高机电效率为7％。

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