【摘要】：新型的智能材料中,壓電陶瓷以其高響應(yīng)頻率、高位移精度、無噪聲等優(yōu)點越來越受到人們的重視。尺蠖式驅(qū)動器通過步進的方式減少了回滯效應(yīng)的影響,同時又可以產(chǎn)生很大的位移,被越來越多的應(yīng)用到高精度控制領(lǐng)域。本文在此基礎(chǔ)上提出了一種三段可拆卸式尺蠖壓電驅(qū)動器的設(shè)計方案并展開相應(yīng)的研究。首先,從壓電參數(shù)和壓電方程入手,結(jié)合設(shè)計要求,選擇了型號為HPST150/20-15/12的壓電堆。建立了壓電振子機電耦合數(shù)學(xué)模型并對其進行ANSYS模態(tài)分析,得到了諧振頻率。在此基礎(chǔ)上進一步對壓電堆做了ANSYS正弦激勵響應(yīng)分析,得到了時間-位移關(guān)系曲線,而且通過實驗的測試與分析驗證了模型的準(zhǔn)確性。其次,由于箝位機構(gòu)和中間驅(qū)動機構(gòu)對驅(qū)動器性能的影響較大,所以對夾持臂和中間筒進行了ANSYS優(yōu)化分析。對夾持臂以結(jié)構(gòu)的整體應(yīng)變能為優(yōu)化目標(biāo),使位移放大系數(shù)和夾緊力達到最優(yōu)值;對中間筒進行壁厚優(yōu)化,使筒體的等效彈性系數(shù)滿足驅(qū)動力要求,并進行中間筒的驅(qū)動實驗,結(jié)合壓電堆回滯曲線,驗證了中間筒壁厚優(yōu)化值的準(zhǔn)確性。同時進行了螺母調(diào)整機構(gòu)的設(shè)計,預(yù)緊彈簧的選型,確定了結(jié)構(gòu)整體設(shè)計方案,并完成了樣品的加工和裝配。最后,基于壓電堆特性和實驗測試曲線,初步完成了驅(qū)動器的控制時序設(shè)計,并基于dSPACE平臺完成了對驅(qū)動時序的驗證,達到了預(yù)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.
【學(xué)位授予單位】：華僑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TH703;TB381
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本文編號：2394615