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首页> 外文会议>International Conference on Adaptive Structures and Technologies; 20051009-12; Paris(FR) >STABILITY OF CYCLIC STRAIN OUTPUT OF NI-TI SHAPE MEMORY ALLOY (SMA) ACTUATOR UNDER DIFFERENT LOADING CONDITIONS AND FREQUENCY BANDWIDTHS
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STABILITY OF CYCLIC STRAIN OUTPUT OF NI-TI SHAPE MEMORY ALLOY (SMA) ACTUATOR UNDER DIFFERENT LOADING CONDITIONS AND FREQUENCY BANDWIDTHS

机译：Ni-TI形状记忆合金（SMA）执行机构在不同载荷条件和频率带宽条件下的循环应变输出的稳定性

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This paper presents a study on the stability of cyclic strain output of the Ni-Ti SMA for up to 4 x 10~4 cycles under different loading conditions and at different actuation frequency bandwidths. It is a part of research activity conducted at the Canadian Space agency (CSA) on applications of SMA, such as the applications for low frequency vibration damping of spacecraft deployable booms, flatness control of space-borne membrane SAR (Synthetic Aperture Radar) antenna and other potential space applications. Pulsed power supply is used to heat the SMA to produce typical cyclic actuations under different loading conditions. The stability of SMA is specifically studied in terms of the development of plastic strain (elongation) and degradation in amplitude of strain output over the number of cycles. The experimental result demonstrates that external loading condition has a significant effect on the stability of strain output of SMA actuator. For 4 x 10~4 cycles of actuation tested, stable cyclic actuation can be achieved when the loading stress is in the range between 60 MPa to 130 MPa. Experiment also indicates that by increasing the actuation frequency, plastic strain of SMA actuator over the number of actuation cycles can be reduced. Particularly, in the case that the cyclic actuation at relatively high frequency involves only partial martensitic phase transformation, fatigue of SMA can significantly be minimized. Experiment on stability of SMA actuator under feedback control application is also performed and SMA tends to have good stability in this case.
机译：本文研究了在不同的负载条件和不同的驱动频率带宽下，Ni-Ti SMA的循环应变输出在4 x 10〜4个循环内的稳定性。这是加拿大航天局（CSA）开展的有关SMA应用的研究活动的一部分，例如SMA对航天器可展开吊臂的低频振动阻尼，星载膜SAR（合成孔径雷达）天线的平坦度控制以及其他潜在的太空应用。脉冲电源用于加热SMA，以在不同的负载条件下产生典型的循环驱动。 SMA的稳定性是根据塑性应变的发展（伸长）和在循环次数中应变输出幅度的下降来专门研究的。实验结果表明，外部加载条件对SMA执行器应变输出的稳定性有重要影响。对于4 x 10〜4个致动循环，当负载应力在60 MPa至130 MPa之间时，可以实现稳定的循环致动。实验还表明，通过增加致动频率，可以减小SMA致动器在整个致动周期数内的塑性应变。特别地，在较高频率的循环致动仅涉及部分马氏体相变的情况下，SMA的疲劳可以显着最小化。还进行了在反馈控制应用下SMA执行器稳定性的实验，在这种情况下SMA趋于具有良好的稳定性。

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