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Nonlinear dynamic characteristics of SMA microgripper subjected to bounded noise excitation

机译：有限噪声激励下SMA微夹钳的非线性动力学特性

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A kind of shape memory alloy (SMA) microgripper is proposed in this paper, and the nonlinear dynamic response of the SMA microgripper subjected to bounded noise excitation is studied. Nonlinear differential items are introduced to explain the hysteretic phenomena of the SMA, and the fitting effect of the constructive model on the experimental data is proved by the partial least--square regression method. The nonlinear dynamic model of a SMA microgripper subjected to bounded noise excitation is developed, and the system’s dynamic response is obtained. The numerical and experimental results show that the system’s response is small in the case of weak excitation, becomes large with the increase of the stochastic excitation, and finally becomes small again with the further increase of the stochastic excitation; the stochastic resonance phenomenon occurs in the process. The results of this paper are helpful for the application of SMA microgripper in engineering fields.
机译：提出了一种形状记忆合金（SMA）微夹钳，研究了SMA微夹钳在有限噪声激励下的非线性动力响应。引入非线性微分项来解释SMA的滞后现象，并通过偏最小二乘回归方法证明了构造模型对实验数据的拟合效果。建立了受到有限噪声激励的SMA夹具的非线性动力学模型，并获得了系统的动态响应。数值和实验结果表明，在弱激励的情况下，系统的响应较小;随着随机激励的增加，系统的响应逐渐增大;随着随机激励的增加，系统的响应逐渐减小。在此过程中会发生随机共振现象。本文的结果对SMA微夹钳在工程领域的应用很有帮助。

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