Modeling and design of a high-performance hybrid actuator
Modeling and design of a high-performance hybrid actuator
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DOI：
10.1088/0964-1726/25/12/125004
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发表时间：
2016-11
影响因子：
4.1
通讯作者：
Badr Aloufi;K. Behdinan;J. Zu
中科院分区：
文献类型：
--
作者：
Badr Aloufi;K. Behdinan;J. Zu
本文介绍了一种新型混合压电执行器的模型和设计，该执行器为智能结构系统提供了高主动和被动性能。该执行器由一对弯曲的预应力压电执行器（所谓的商业 THUNDER 执行器）组成，使用两个由平面内可固定铰链、夹具和实心连杆构成的夹紧机构相对安装。开发了一个完整的数学模型来描述执行器的主动和被动动力学，并研究其几何参数对动态刚度、自由位移和阻塞力特性的影响。在涉及使用 THUNDER 元件作为机电动力源的压电执行器的文献中，所提出的研究是独特的，因为它提出了一个数学模型，能够预测执行器特性并实现其他现象，例如共振、振型、相移、下降等。为了模型验证，使用特定执行器设计的每单位电压的自由动态响应和被动加速度传递率的测量来检查模型预测结果的准确性。结果表明模型与实验具有良好的一致性。另一项实验是通过检查不同频率下不同力和电压下输出动态响应的变化来测试执行器系统的线性度。从结果可以得出结论，执行器在频率高达 1000 Hz 时近似充当线性系统。这里通过应用开发的模型来分析可固定铰链的几何参数对主动和被动执行器特性的影响来实现参数研究。 0~1000 Hz频率范围内的模型预测表明，铰链厚度、半径和张角参数对频率动态响应、无源隔离特性及其峰谷位置有很大影响。此外，可以通过增加铰链硬度来提高输出驱动力，铰链硬度由其尺寸控制，尽管增加铰链硬度可能导致自由位移和无源绝缘性能下降，特别是在低频下。
This paper presents the model and design of a novel hybrid piezoelectric actuator which provides high active and passive performances for smart structural systems. The actuator is composed of a pair of curved pre-stressed piezoelectric actuators, so-called commercially THUNDER actuators, installed opposite each other using two clamping mechanisms constructed of in-plane fixable hinges, grippers and solid links. A fully mathematical model is developed to describe the active and passive dynamics of the actuator and investigate the effects of its geometrical parameters on the dynamic stiffness, free displacement and blocked force properties. Among the literature that deals with piezoelectric actuators in which THUNDER elements are used as a source of electromechanical power, the proposed study is unique in that it presents a mathematical model that has the ability to predict the actuator characteristics and achieve other phenomena, such as resonances, mode shapes, phase shifts, dips, etc. For model validation, the measurements of the free dynamic response per unit voltage and passive acceleration transmissibility of a particular actuator design are used to check the accuracy of the results predicted by the model. The results reveal that there is a good agreement between the model and experiment. Another experiment is performed to teste the linearity of the actuator system by examining the variation of the output dynamic responses with varying forces and voltages at different frequencies. From the results, it can be concluded that the actuator acts approximately as a linear system at frequencies up to 1000 Hz. A parametric study is achieved here by applying the developed model to analyze the influence of the geometrical parameters of the fixable hinges on the active and passive actuator properties. The model predictions in the frequency range of 0–1000 Hz show that the hinge thickness, radius, and opening angle parameters have great effects on the frequency dynamic responses, passive isolation characteristics and the locations of their peaks and dips. Furthermore, the output actuating force can be improved by increasing the hinge hardness, which is controlled by its dimensions, although increasing the hinge hardness may cause a decrease in the free displacement and passive insulation performance, particularly at low frequencies.