RESEARCH ON TRACKING CONTROL STRATEGY FOR HIGH SPEED MACHINE TOOL WITH LINEAR MOTOR
| Autor: | Cheng-Yi Hsieh, 謝政誼 |
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| Rok vydání: | 2003 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 92 In this thesis, we focus on the physical analysis and position control of linear motors applied to the machine tool. In the beginning, we derive the dynamic equations and transfer function from the free body diagram of the machine tool structure. And through the simulation of the transfer function, we find that the frequency of vibration corresponds to the physical phenomenon which we observe in the step response experiment. Besides, we use discrete Fourier transform (DFT) to transform an ordered sequence of data samples in the step experiment from the time domain into the frequency domain. Consequently, we can conclude that the flexibility of the mechanical structure gives rise to the vibration. In position loop, we analyze several control algorithms and compare what advantage and disadvantage each has. At last, we propose an additional analog electronic lead-lag circuit to improve the contour error. After experiments, it validates that the lead-lag controller can improve about ten times tracking error. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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