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首页> 外文会议>56th International Astronautical Congress 2005 vol.6 >ACTUATION PRECISION CONTROL OF SMA ACTUATORS USED FOR SHAPE CONTROL OF INFLATABLE SAR ANTENNA
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ACTUATION PRECISION CONTROL OF SMA ACTUATORS USED FOR SHAPE CONTROL OF INFLATABLE SAR ANTENNA

机译：用于可充气SAR天线形状控制的SMA执行器的运动精确控制

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摘要

Shape memory alloy (SMA) actuators have found a wide range of applications due to their unique properties such as high force, long stroke, small size, light weight, and silent operation, etc. However, their poor stability and controllability make them a challenge to achieve accurate actuation. This paper presents a simple control strategy based on the idea of adjusting the SMA wire temperature as fast as possible. This strategy is simple, stable, and requires no hysteresis model or thermal model. This strategy is tested with displacement output, and the effects of updating rate and input current on control accuracy are also discussed. Tests are also performed in a thermal vacuum chamber, and the results indicate that the required current for effectively activating SMA actuator is smaller than that in air environment. This control strategy is then used for adjusting boundary tensions of a small membrane Synthetic Aperture Radar (SAR) antenna model. Results show that, under this control strategy, SMA wire actuators can exert desired tensions with very good accuracy.
机译：形状记忆合金（SMA）执行器由于其独特的特性（例如高力，长行程，小尺寸，轻巧和静音操作等）而被广泛应用。但是，其差的稳定性和可控性使其成为一个挑战。实现精确的驱动。本文提出了一种基于尽可能快地调整SMA线温度的思想的简单控制策略。该策略简单，稳定，并且不需要磁滞模型或热模型。用位移输出测试了该策略，并讨论了更新速率和输入电流对控制精度的影响。还在热真空室中进行了测试，结果表明，有效激活SMA执行器所需的电流小于空气环境中的电流。然后，此控制策略用于调整小膜合成孔径雷达（SAR）天线模型的边界张力。结果表明，在这种控制策略下，SMA导线执行器可以非常精确地施加所需的张力。

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