壓電傳送平台之動態模擬與實驗驗證

本論文主要為分析工業用之物件傳送平台並建立其理論模型，此機構是以平行壓電致動器作為主要的驅動來源，經由兩平行樑同步之振動，使平台產生週期性之擺動，導致平台上之物件受到帶動作向前之傳輸動作。在模型建立方面，考慮此機構各部分的材料性質以及壓電材料本身所具有之特性，利用Rayleigh-Ritz方法，將原系統簡化為橫向振動懸臂樑結構的型式來分析其運動狀態，其中以假設三個低階的Assumed modes描述平行樑壓電傳送平台的複雜動態。藉由三個Assumed modes的建立，系統動態即可利用三個耦合之離散（Discrete）方程式來表示，平台的位移及速度即可由此方程式求得。因此，藉由物件與平台之間撞擊動態，可得知兩者間相互的運動關係，則物件的傳輸行進速度即可求得。本論文利用數值模擬所推估之物件行進速度，可與實際實驗值達到一致。

關鍵字

Rayleigh-Ritz方法；壓電材料；物件傳送平台

並列摘要

The study is intended to establish an analytic model of the industrial-used part feeder, which contains mainly a horizontal platform powered by parallel-beam piezoelectric actuators. The parts to be transported on the platform march forward due to their intermittent collision with the platform. The modeling technique used is essentially the Rayleigh-Ritz method, which first incorporates material properties and constitutive equations of the piezoelectric materials and then captures the complex dynamics of the parallel-beam piezo-feeder by three lower-order assumed modes in the transverse direction of the vibrating beam. With the three approximated assumed modes in hand, the system dynamics is then represented by three coupling discrete equations of motion. Based on these equations, displacement and velocity of the platform can be obtained. With impact dynamics, that prescribes the collision between the pats and the platform, investigated next, the marching speed of the parts can be predicted. Numerical computations are conducted to acquire the estimated marching speed of the parts, the results of which have a satisfactory agreement with those measured from experimental studies.

並列關鍵字

part feeder ； piezoelectric materials ； Rayleigh-Ritz method

參考文獻

[1]Ge, P. and Jouaneh, M., 1995, “Modeling Hysteresis in Piezoceramic Actuators,” Precision Engineering, 17, 3, July, pp. 211-221.

[2]Goldfarb, M. and Celanovic, N., 1997, “Modeling Piezoelectric Stack Actuators for Control of Micromanipulation,” IEEE Control Systems, June, pp.69-79.

[3]Ge, P. and Jouaneh, M., 1996, ”Tracking Control of Piezoceramic Actuator,” Transactions on Control Systems Technology, 4, 3, May, pp 209-216.

[4]Jung, S.B. and Kim, S.W., 1994, “Improvement of Scanning Accuracy of PZT Piezoelectric Actuators by Feed-forward Model-reference Control,” Precision Engineering, 16, 1, January, pp. 49-55.

[5]Croft, D., Shed, G.. and Devasia, S., 2001, “Creep, Hysteresis, and Vibration Compensation for Piezoactuators: Atomic Force Microscopy Application,” ASME Journal of Dynamic Systems, Measurement, 123, March, pp.35-43.

國際替代計量

壓電傳送平台之動態模擬與實驗驗證

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