动力荷载作用下压电主元杆件的动力稳定控制性能研究
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摘要
压电材料是一种良好的功能性材料,具有独特的压电效应,其中包括正、逆压电效应两类.本文根据压电材料的正、逆效应设计并制作了能够实现测-控合一的压电主元杆件,即在结构中起主要作用的杆件上集成压电堆,以形成所谓的压电主元杆件.本文根据稳定及动力学等原理,建立了压电主元杆件的动力稳定控制基本方程,采用数值模拟方法探讨了动荷载作用下压电主元杆件的动力稳定控制性能.研究结果表明考虑机电耦合作用时,压电堆长度和压电堆夹持力等因素的共同影响,使得压电主元杆件动力失稳区域面积减小,相应的动力稳定控制性能提高.这说明适当提高激励电压,即可有效地提高压电主元杆件的动力稳定控制性能.
The piezoelectric material is a good kind of functional material which provides with a unique piezoelectric effect including piezoelectric effect and converse piezoelectric effect.In view of the excellent piezoelectric effect and converse piezoelectric effect,this paper designs and fabricates piezoelectric pivot element bars which can accomplish testing-controlling functions,integrating piezoelectric stack into the element bars playing a major role to form a so-called piezoelectric pivot element bar.According to theory of structural stable science and structural dynamics,basic dynamical stability control function was put forward and the control properties were discussed with numerical simulation method.The research results show that with regard to the coupling between mechanic-electric of piezoelectric,the dynamical instability area decreases for the effect of length of piezoelectric stack and driving force,so that the stability property of piezoelectric pivot element bar increases effectively.That is to say,the methods that is used to increase the exciting voltage appropriately can improve the dynamical performance of piezoelectric pivot element bar greatly.
The piezoelectric material is a good kind of functional material which provides with a unique piezoelectric effect including piezoelectric effect and converse piezoelectric effect.In view of the excellent piezoelectric effect and converse piezoelectric effect,this paper designs and fabricates piezoelectric pivot element bars which can accomplish testing-controlling functions,integrating piezoelectric stack into the element bars playing a major role to form a so-called piezoelectric pivot element bar.According to theory of structural stable science and structural dynamics,basic dynamical stability control function was put forward and the control properties were discussed with numerical simulation method.The research results show that with regard to the coupling between mechanic-electric of piezoelectric,the dynamical instability area decreases for the effect of length of piezoelectric stack and driving force,so that the stability property of piezoelectric pivot element bar increases effectively.That is to say,the methods that is used to increase the exciting voltage appropriately can improve the dynamical performance of piezoelectric pivot element bar greatly.
引文
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[2]刘光栋,罗汉泉.杆系结构稳定[M].北京:人民交通出版社,1988.LI U G D,LUO H Q.Stability of skeleture structure[M].Beijing:China Press,1988.
[3]田鹏刚.空间结构智能稳定控制的基本理论和试验研究[D].西安:西安建筑科技大学,2007.TIAN P G.Experi ment and Basic Theoretical Study of Stability Control on Space Structure[D].Xi′an:Xi′an Uni-versity of Architecture&Technology,2007.
[4]DONNELL L.A newtheory for the buckling of thin cylinders under axial compression and bending[J].Trans AmSoc Mech Engs,1934,56:795-806.
[5]KOITER WT.On the Stability of Elastic Equilibrium[D](in Dutch).Delft,Amsterdam,1945,English transfor-mationissued as NASA TTF10,1967:833-842.
[6]TI MOSHENKOS.,Einige stabilita tsprobleme der elastizita tstheorie[J].Z.Math.Physik,1910,58(2):337-385.
[7]王社良,沈亚鹏.地震作用下建筑结构的主动控制分析方法[J].西安建筑科技大学学报:自然科学版,1998,30(3):217-220.WANG S L,SHEN Y P.Active control algorithmfor buildings under seismic loads[J].J.Xi′an Univ.of Arch.&Tech.:Natural Science Edition,1998,30(3):217-220.
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