- 會議論文
承受移動動態負載之高速精密定位平台的動態分析與性能改善
Dynamic Analysis and Performance Enhancement of a High Speed Precision Positioning Platform Subjected to Moving Dynamic Loads
摘要
本研究之目的為探討移動裝置在高速精密定位平台上快速移動所引致振動之系統動態分析與性能改善。首先將建構承受移動負載之高速精密定位平台的有限元素模型，並利用Newmark法求解，以取得系統的動態響應，由參數分析可知，如設計得當，將高速移動裝置的支撐與重心維持對稱，或外力拉動高速移動裝置時其作用線通過重心，可以大幅減少振動幅度，尤其是外力作用位置的影響更是明顯，外力作用線通過重心時，系統動態與靜態位移響應雷同，幾乎可維持無振盪之狀況。如在實務上無法實現上述條件，高速移動裝置之支撐與重心不對稱，以及外力拉動高速移動機台時作用線未通過重心，則需進行參數影響分析以改善系統性能，本研究顯示在各項改善措施中，於高速移動裝置的支撐處加入阻尼，對於旋轉位移響應的改善相當有效，使系統快速回到平衡位置以利後續之作業。
並列摘要
The purpose of this study is to conduct the dynamic anaslysis and performance enhancement for a device moving on a high-speed precision positioning platform subjected to moving dynamic loads. The finite element model for the high-speed precision positioning platform subjected to moving loads is formulated first, and the Newmark's method is uitlized to obtain the dynamic response of the system. From the parameter analysis, it is demonstrated that, if properly designed by symmetrically supporting the high-speed moving device with respect to its center of gravity, or ensuring the line of action of the external force to pass through its center of gravity, the vibration amplitude can be significantly reduced. The impact of the external force position is even more evident when the line of action of the external force passes through the center of gravity, making the dynamic response of the system being almost the same as the static response. If the above conditions can not be realized in practice such that the high-speed moving device is asymmetrically supported and the line of action of the external force does not pass through the center of gravity, parameter analysis is required to ensure the improvement of the system performance. This study shows that, among various improvement measures, it is quite effective in reducing the rotational response of the high-speed moving device by adding damping to the support positions. The system rapidly returns to its equilibrium position, facilitating further processing.
延伸閱讀
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