面向運動控制的輪廓誤差補償關鍵技術研究
[Abstract]:Trajectory tracking and contour error compensation are important research contents of modern NC machining technology, which directly affect the production quality and efficiency of NC machine tools. In this paper, the problems of trajectory tracking and contour error compensation technology in NC machining field are analyzed theoretically. The main research goal is to put forward the theoretical analysis on the discrete time selection of zero phase-difference position tracking control design. The cross-coupling control compensation in profile error compensation control strategy is studied. Compared with the traditional position error compensation algorithm, the global task coordinate system algorithm is applied to cross-coupling control. The main research contents are as follows: (1) the current profile error compensation control strategy in the field of NC machining mainly focuses on the tracking accuracy of single-axis servo position system and the establishment of profile error model. The research status of motion control compensation technology at home and abroad is compared and analyzed. (2) the zero phase error tracking control technology used to improve the accuracy of profile tracking is analyzed. According to the mathematical model of the simplified position servo system, the corresponding feedforward controller is designed, and the simulation results of the zero phase error controller designed for different discrete time are analyzed. Combined with the mathematical model of the system and the stability of the feedforward controller, the simulation graph results are analyzed. The stability of feedforward controller designed by discrete system and the theoretical analysis of discrete time are analyzed. It is proposed that there are optimal discrete time sampling points in the design of feedforward controller and verified by detailed theoretical derivation. (3) the estimation of various outline error models and the advantages and disadvantages of the calculation methods are studied. Compared with the traditional approximate estimation cross-coupling control algorithm and the global task coordinate system algorithm, the compensation effect of cross-coupling control method on outline error is analyzed and studied. The global task coordinate system algorithm is applied to cross-coupling control. (4) through the above theoretical analysis, the simplified mathematical model of servo system is taken as the simulation object. The proposed algorithm is simulated to verify the trajectory tracking and contour error compensation in Simulink environment, and the related theoretical verification is verified. (5) the research contents of this paper are summarized. And the future research direction is prospected.
【學位授予單位】:廣東工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TG659;TP391.9
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