摘要
为了进一步增大压电双晶片驱动器的输出角位移,基于轴向预压缩增大压电双晶片输出转角和力矩的方法,提出一种带有连杆机构的压电双晶片驱动器。对驱动器建立了端部带有扭簧的静力学数值模型,以及端部带有微小舵面的刚柔耦合拉格朗日动力学方程及有限元模型。所得的数值结果和有限元结果总体符合程度较好,静力学结果表明:带有连杆机构的轴向预压缩(PBP)驱动器较原PBP驱动器输出角位移增大了4倍以上,最大输出转角可达到26.3°,而输出转矩随之缩小。动力学结果给出了驱动器机构内部能量的传输及分配特性,以文中舵面作为驱动对象,驱动器平均输出角速度达到2 000°/s,控制带宽达到30 Hz,明显优于普通伺服舵机。该角位移增大PBP驱动器的设计和仿真研究可为以大位移、小输出力矩、高控制带宽为特征的微小型飞行器舵机的研制提供理论参考依据。
In order to magnify the output angular displacement of piezoelectric bimorph further, a bimorph actuator with a connecting rod mechanism is angle and torque of piezoelectric bimo model with a torsion spring on its end rp is proposed based on the method of increasing the output h by post-buckled pre-compression （PBP）. A static numerical founded. And the rigid-flexible coupling Lagrange equation dynamic model and FEM model both with small rudder are also established. The results indicate a better coincidence between the numerical and FEM models. Statics results show that connection rod mechanism proposed can produce an output angular displacement which is 4 times bigger than that produced by the o-riginal PBP driver, and the biggest output angular reaches 26.3°, reducing the output torque. The dynamics results show the transfer and distribution of the interior energy of actuator mechanism. Taking the small rudder in this paper as a driving object, the the control bandwidth reaches 30 Hz, which are average output angular velocity reaches 2 000°/s, and much better than those of the ordinary servo actuator Therefore, the design and simulation of the proposed actuator can provide the theoretical basis to the development of micro-flight rudder characterized by large displacement, small output torque and high control bandwidth
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2014年第8期1258-1266,共9页
Acta Armamentarii
关键词
航空器结构与设计
预压缩压电双晶片
驱动器
增大角位移
刚柔耦合
拉格朗日方程
aircraft structure and design
pre-compression piezoelectric bimorph
actuator
output angular displacement
rigid-flexible coupling
Lagrange equation
