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三段可拆卸式尺蠖压电驱动器设计

发布时间:2018-12-29 08:53
【摘要】:新型的智能材料中,压电陶瓷以其高响应频率、高位移精度、无噪声等优点越来越受到人们的重视。尺蠖式驱动器通过步进的方式减少了回滞效应的影响,同时又可以产生很大的位移,被越来越多的应用到高精度控制领域。本文在此基础上提出了一种三段可拆卸式尺蠖压电驱动器的设计方案并展开相应的研究。首先,从压电参数和压电方程入手,结合设计要求,选择了型号为HPST150/20-15/12的压电堆。建立了压电振子机电耦合数学模型并对其进行ANSYS模态分析,得到了谐振频率。在此基础上进一步对压电堆做了ANSYS正弦激励响应分析,得到了时间-位移关系曲线,而且通过实验的测试与分析验证了模型的准确性。其次,由于箝位机构和中间驱动机构对驱动器性能的影响较大,所以对夹持臂和中间筒进行了ANSYS优化分析。对夹持臂以结构的整体应变能为优化目标,使位移放大系数和夹紧力达到最优值;对中间筒进行壁厚优化,使筒体的等效弹性系数满足驱动力要求,并进行中间筒的驱动实验,结合压电堆回滞曲线,验证了中间筒壁厚优化值的准确性。同时进行了螺母调整机构的设计,预紧弹簧的选型,确定了结构整体设计方案,并完成了样品的加工和装配。最后,基于压电堆特性和实验测试曲线,初步完成了驱动器的控制时序设计,并基于dSPACE平台完成了对驱动时序的验证,达到了预期效果。
[Abstract]:Among the new intelligent materials, piezoelectric ceramics have attracted more and more attention because of its high response frequency, high displacement accuracy and no noise. Geometrid actuator can reduce the hysteresis effect by stepping, and at the same time, it can produce large displacement, which has been applied to high precision control field more and more. In this paper, a design scheme of a three-stage detachable geometrid piezoelectric actuator is proposed and the corresponding research is carried out. First, starting with the piezoelectric parameters and the piezoelectric equations and combining the design requirements, the piezoelectric stack of HPST150/20-15/12 is selected. The mathematical model of electromechanical coupling of piezoelectric oscillator is established and the resonant frequency is obtained by ANSYS mode analysis. On this basis, the ANSYS sinusoidal excitation response of the piezoelectric reactor is further analyzed, and the time-displacement relationship curve is obtained, and the accuracy of the model is verified by the experimental test and analysis. Secondly, because the clamping mechanism and the intermediate driving mechanism have great influence on the performance of the driver, the ANSYS optimization analysis of the clamping arm and the middle cylinder is carried out. The optimum value of displacement magnification factor and clamping force is obtained by taking the integral strain energy of the structure as the optimization target for the clamping arm. The wall thickness of the middle cylinder is optimized to make the equivalent elastic coefficient of the tube meet the driving force requirement. The driving experiment of the middle tube is carried out and the accuracy of the optimized value of the wall thickness of the middle cylinder is verified by combining the hysteresis curve of the piezoelectric pile. At the same time, the adjusting mechanism of nut is designed, the type selection of preload spring is carried out, the whole design scheme of structure is determined, and the processing and assembly of the sample are completed. Finally, based on the characteristics of the piezoelectric stack and the experimental test curve, the control timing design of the driver is preliminarily completed, and the driver timing is verified based on the dSPACE platform, and the desired results are achieved.
【学位授予单位】:华侨大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:TH703;TB381


本文编号:2394615


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