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首页> 外文期刊>Journal of intelligent material systems and structures >Pseudoelastic SMA Spring Elements for Passive Vibration Isolation: Part II - Simulations and Experimental Correlations
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Pseudoelastic SMA Spring Elements for Passive Vibration Isolation: Part II - Simulations and Experimental Correlations

机译：用于被动隔振的伪弹性SMA弹簧元件：第二部分-仿真和实验相关性

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摘要

In Part II of this two-part study, system simulations and experimental correlations of a Shape Memory Alloy (SMA) based vibration isolation device (briefly described in Part I) has been presented. This device consists of layers of preconstrained SMA tubes undergoing pseudoelastic transformations under transverse dynamical loading. In Part II, detailed description of the prototype vibration isolation device, its experimental setup, and actual experimental test results are presented. An extensive parametric study has been conducted on a nonlinear hysteretic dynamical system, representing this vibration isolation device utilizing a physically based simplified SMA model and a Preisach model (an empirical model based on system identification) developed in Part I. Both the physically based simplified SMA model and the modified Preisach model have been utilized to perform experimental correlations with the results obtained from actual testing of the device. Based on the investigations, it has been shown that variable damping and tunable isolation response are major benefits of SMA pseudoelasticity. Correlation of numerical simulations and experimental results has shown that large amplitude displacements causing phase transformations of SMA components present in such a device are necessary for effective reduction in the transmissibility of such dynamical systems. It has also been shown that SMA-based devices can overcome performance trade-offs inherent in typical softening spring-damper vibration isolation systems. In terms of numerically predicting the experimental results, it has been shown that the Preisach model gave relatively accurate results due to better modeling of the actual SMA tube behavior. However, for a generic parametric study, the physically based simplified SMA model has been found to be more useful as it is motivated from the constitutive response of SMAs and hence, could easily incorporate different changes in system conditions.
机译：在这个由两部分组成的研究的第二部分中，介绍了基于形状记忆合金（SMA）的隔振设备（在第一部分中简要介绍）的系统仿真和实验相关性。该装置由预约束的SMA管层组成，这些管在横向动力载荷下会进行伪弹性转换。在第二部分中，将详细介绍原型隔振装置，其实验装置以及实际的实验测试结果。已经对非线性磁滞动力系统进行了广泛的参数研究，该振动隔离装置利用了在第一部分中开发的基于物理的简化SMA模型和Preisach模型（基于系统识别的经验模型）来表示。这两种基于物理的简化SMA该模型和改进的Preisach模型已用于与设备的实际测试结果进行实验相关。根据调查，已显示出可变阻尼和可调隔离响应是SMA伪弹性的主要优点。数值模拟和实验结果的相关性表明，导致这种设备中存在的SMA组件发生相变的大幅度位移对于有效降低此类动力学系统的透射率是必要的。还已经表明，基于SMA的设备可以克服典型的软化弹簧-阻尼器隔振系统固有的性能折衷。在数值预测实验结果方面，由于对实际SMA管行为的更好建模，已显示Preisach模型给出了相对准确的结果。但是，对于一般的参数研究，发现基于物理的简化SMA模型更为有用，因为它是受SMA的本构响应驱动的，因此可以轻松地纳入系统条件的不同变化。

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