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Study on Some Key Issues in Intelligent Control of CNC Machines

Author: ShiXuGuang
Tutor: ZuoBuGong
School: South China University of Technology
Course: Control Theory and Control Engineering
Keywords: NC Motion Control Real-time systems Intelligent Control Non-uniform rational B-spline curve
CLC: TP273
Type: PhD thesis
Year: 2009
Downloads: 802
Quote: 4
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Abstract


In recent years, the digital control technology play an increasingly important role in the industrial sector, increasingly widespread use, and are widely used in the field of CNC machine tools, electrical discharge machining, industrial robots, precision electronics manufacturing. CNC technology research and development, which has a general sense of intelligent control architecture, high-performance motion control technology, and the complex trajectory of real-time control strategies has become a key technology to enhance industry Advanced. In recent decades, industry, academia, and some of the key issues from different angles to study and interpretation of the field of NC. This project intends to start from the establishment of a unified intelligent CNC system platform, cutting with independent intellectual property dedicated real-time CNC operating system platform; oriented to the needs of industry, research complex trajectory scenarios of various control strategies, including small line model of integration under the speed of forward-looking control, and to achieve a common parametric curve interpolation, research based on non-uniform rational B-spline curve interpolation technique to study a number of intelligent control strategy applied to actual high-performance motion controller R \u0026 D, the specific design of the neural network curve interpolation algorithm and PID controller based on improved genetic algorithm. The topic is expected to corresponding progress in terms of both theoretical and practical, is expected to further enrich the intelligent control theory in the field of mechatronics, the main contents are as follows: based on the structural characteristics of the system control of the mechanical and electrical equipment, the paper presents a hierarchical-based numerical control system of intelligent control strategy framework that specific analysis of digital motion control design and implementation of the specific characteristics of the combination of RCS (Realtime Control System) to TASK, IO, MOTION, GUI, with distinctive characteristics of mechanical and electrical equipment in the field control system architecture. Research specific analysis of the special numerical reduction of the process of real-time operating system and to experimental verification, in fact, the process of switching accuracy at the microsecond level, and has laid a good foundation for the entire system real-time. The hardware side, the paper focuses on the movement control IC design ideas and part of the simulation process are given and the corresponding board-level hardware design process, ultimately the formation of the PC104 interface features, with an eight-axis maximum expansion to 12 six-axis, compatible with open and closed-loop two control modes, high-performance motion control hardware platform. In a complex trajectory, taking into account based on non-uniform rational B-spline (NURBS) curve technology has become the de facto standard in the field of CAD, NURBS interpolation technique has also become a major research focus of CNC machining and CAD / CAM field . Thesis NURBS interpolation algorithm based on double arc approximation theory, and to give the corresponding experimental analysis. Parametric curve interpolation inherent speed fluctuation, the paper also give the space to be describe and explain the explanation is given, and from the two aspects of the algorithm simulation and experimental processing. The paper also studied the mechanical and electrical equipment trajectory control hot issues, including intensive small segments focus on optimizing the processing, and the processing of integration; research machinery and equipment speed control, intelligent forward-looking scenarios to consider the complex trajectory control (Look-Ahead) , the use of optimization theory study which speed optimal control problem. Departure from the acceleration and deceleration control point of view, the paper proposes a rounding error compensation strategy based on the S-curve, perfect S curve acceleration and deceleration algorithm theoretical research framework. In the introduction of intelligent numerical processing algorithms to the actual motion control system applications, the paper focuses on the neural network curve interpolation technology and PID controller based on genetic algorithm to improve the design and implementation of Which the curve interpolation technology research in neural networks, the paper considers the general neural network processing features, using BP network training NURBS parametric curves, the use of strong nonlinear neural network curve fitting features to address the process of NURBS curves constructed from the parameter The space-to-the geometric space mapping problem. In the process of introducing genetic algorithm constructs controller, papers to establish a more comprehensive algorithm simulation environment, more comprehensive consideration of the genetic algorithm corresponding influencing factors control the effect of the actual system. This section papers cover the theory and algorithms are the actual experiment in a laboratory environment, given the results of the corresponding analysis.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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