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首页> 外文期刊>Mechatronics, IEEE/ASME Transactions on >Actuation Frequency Modeling and Prediction for Shape Memory Alloy Actuators
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Actuation Frequency Modeling and Prediction for Shape Memory Alloy Actuators

机译：形状记忆合金执行器的致动频率建模与预测

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摘要

This article proposes a numerical model to predict actuation frequencies (strain-cycling frequencies) for 1-D shape memory alloy (SMA) actuators. The numerical model is designed by comprehensively considering the factors that significantly affect an SMA actuator's straincycling frequency, i.e., heat convection methods, constant or nonconstant bias loads, and Joule heating methods. For computing strain cycles of SMA actuators, we develop a computation framework that effectively integrates an SMA constitutive model, a phase transformation kinetic model, stress-strain models for different types of bias stress, and a heat transfer model of SMA wires. The strain and temperature rates are formulated by nonlinear ordinary differential equations. The strain and temperature cycles can be accurately approximated by numerical iterative methods. Experimental verification was conducted to investigate the effectiveness of the proposed model. By initially identifying the SMA characteristic parameters, we employed Latin hypercube sampling method to generate 30 sets of design parameters for comparing the predicted and measured actuation frequencies. In addition, we investigated how the uncertainty of premeasured SMA characteristic parameters affect the numerical prediction of actuation frequency by conducting sensitivity analysis. The experiments demonstrate 0.7%-9M3% and 2.65%-17.57% differences between predicted and measured actuation frequencies for constant bias loads and spring bias loads, respectively.
机译：本文提出了一种用于预测1-D形记忆合金（SMA）致动器的致动频率（应变循环频率）的数值模型。通过全面考虑显着影响SMA致动器的菌丝循环频率的因素，即热对流方法，恒定或不合理的偏置载荷以及焦耳加热方法来设计数值模型。为了计算SMA执行器的应变循环，我们开发了一种计算框架，其有效地集成了SMA本构模型，相变动力学模型，用于不同类型的偏置应力的应力 - 应变模型，以及SMA线的传热模型。应变和温度率通过非线性常微分方程配制。通过数值迭代方法可以精确地近似应变和温度循环。进行了实验验证以调查拟议模型的有效性。通过最初识别SMA特征参数，我们采用了拉丁超超立体采样方法来生成30组设计参数，用于比较预测和测量的致动频率。此外，我们研究了通过进行敏感性分析来如何影响预先测量的SMA特征参数的不确定性如何影响致动频率的数值预测。实验表明了恒定​​偏置载荷和弹簧偏置载荷的预测和测量致动频率之间的0.7％-9m3％和2.65％-17.57％。

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