Research on Control Strategy of High Performance CNC System Based on Open Structure

Research on Control Strategy of High Performance CNC System Based on Open Structure Wang Junping, Fan Wen Wang An, Jing Zhongliang 3 710072, 1 Xi'an: T: College, Xi'an 710032, Shanghai Jiaotong University Shanghai Key Open Architecture, "I. Parts and CNC As a unified whole, the system considers how to improve the S-degree. 槎arr7 open structure high-performance CNC system control strategy off a: open architecture, high-performance control f numerical control system 1 control strategy in the classification number, TP273 , A is S-mediated U Ping (19H?), male (Han S>.KH Heyang County. West this work, the Tusi students from the previous number of machine tools and their CNC systems are moving towards speed. a slightly savvy The main reason for the surface pile is to realize the monitoring of the idle processing and the design of the valve controller of the design. However, the new type of transmitter, the advanced servo control algorithm, the control of the process And the application is subject to the traditional system of defeat control system architecture, so many scholars are committed to ignoring the new architecture, that is, the open architecture. This article is in the open architecture. Consider the workpiece and the CNC as a unified entity. Woman Accuracy, improve the performance of the open structure of the numerical control system, the system is a system of control system, the CNC system is a special type of system, it is used for industrial field control, and general purpose computer There are many differences. For a long time, the development of the number s system is self-contained. Establishing its own soft stem structure, implementing technical secrecy and technical sealing, making it difficult for machine tool manufacturers and final use to develop secondary machine tools and CNC systems. The ability to teach the machine tool into the distributed control and flexible column manufacturing system environment, and even require communication with CAD/CAPP/CAM and other co-networking systems, the cnc installed in the family is not enough Used, the new ring fill requirements. ""The device is further transformed into an open CNC system.

The open architecture adopts the hierarchical HiN of the block and is externalized for various applications to be connected to the P, which is portable.

The characteristics of scalability, interoperability and retractability, that is, the internal openness of the system and the openness between the components of the system, and the system of the system is based on the open system. The performance control system is controlled by the servo controller, multi-transfer ffi device and the digital value processor. As shown in Kl 1, the modern processing system is supported by the servo system. . Before the servo system can play the role of the workpiece's twist, most of the work centers are equipped with servo systems. These servo M systems use the traditional household 0 anti-cabinet controller to become more and more ambiguous. The speed of the work such as the work order by the ruthenium control has not been able to do -S This high-strength robust motion control is extremely important, its S is to achieve the nominal 厣琮 error close to fi resolution string. To achieve the full range of choices, such as the work of the project, there are still many peach battles. In the main room of ft, the A-speed high-speed servo controller is designed in the presence of anti-motion and non-linear discrimination. When using the servo controller with limited bandwidth, the combination of the delay is the main cause of position error. The reason is that the sweetness will affect the geometricality of the workpiece. The flSF system should have the characteristics of the gel and the performance of the rod. When the parameters of the kinetic pit change, the performance is very tricky. These nets will follow. When the feed rate is improved during the speed machining and the high-performance rod motion controller is more strictly designed, these H揉 should be compensated by the test of Lm and Totnimfca. The overall control structure of the disturbance of the current device, the position of the anti-drain control device and the sputum reducer, that is, the high-performance buried system (DOB) based on the disturbance, the disturbance gauge (for the disturbance and simulation) Uncertainty makes the system more robust to the uncertainty of the calibration. The feedforward ffi controller can adopt the S-prediction control. Zero-phase error tracking control W. Repeated control oblique words to lift away from the fine-tuning, position feedback control PID control is usually used. For nonlinear friction compensation, the commonly used methods are: online compensation method based on exponential nonlinear function, inverse controller compensation method based on neural network, robust repetitive control and variable structure control. When the system parameters change greatly or the motion trajectory has discontinuous acceleration, DOB is not very suitable. Yao and Tamizuka proposed a new motion control method, namely adaptive robust control, based on adaptive robust control. The system has good tracking performance.

Multi-sensor detection and information fusion In the performance processing of 篼, the commonly used methods for improving the machining accuracy are error avoidance technology based on the accuracy of the machine tool and error compensation technology based on the elimination error itself. The ultimate goal of both methods is to reduce the machining error of the parts. In this paper, the workpiece and the numerical control system are considered as a unified whole to improve the machining accuracy, and the workpiece and the numerical control system are linked by multi-sensor detection. Compared with a single sensor system, the multi-sensor information fusion system has the advantages of large amount of information, good fault tolerance, and ability to obtain characteristic information that cannot be obtained by a single sensor. The machining process is an extremely complex and variable process. The changes in position, speed, temperature and cutting force interact with each other. Only by strengthening the collection and recognition of this information, reliable data can be obtained for proper control. The corresponding signals are measured by a variety of sensors, and then the multi-sensor information fusion technology is used to sense the processing status information, thereby providing the controller with real and reliable comprehensive information and improving the control precision.

With the increasing demand for system information processing speed and real-time performance, with the development of large-scale integrated circuits, various chip DSPs dedicated to real-time digital signal processing have emerged. Compared with general-purpose microprocessors, There are two characteristics: the DSP chip mostly adopts the Harvard structure, which separates the program instruction and the data storage space, each has its own address and data bus, which makes the processing instructions and data can be simultaneously performed, thereby greatly improving the processing efficiency; When the microprocessor executes an instruction, it takes several instruction cycles to complete. The DSP chip uses pipeline technology. Although the execution time of each instruction is still several instruction cycles, due to the pipeline operation of the instructions, look at each The final execution time of the instruction is completed in a single instruction cycle.

In the numerical control system, the digital signal processor performs functions such as data acquisition, trajectory generation, control strategy selection, and real-time control.

3 Conclusion This paper starts from the requirements of precision machining. Through the multi-sensor information fusion technology, the workpiece and numerical control system are considered as a unified whole to improve the machining accuracy. The control strategy of the numerical control system based on the open structure is proposed. This strategy is equally valuable for the control of other moving bodies.

Gold celebration and so on. Development of a high performance CNC system based on an open structure. Manufacturing Technology and Machine Tools, 1998 (8): 1416 Chen Meihua and so on. The development and application of processing error intelligent modeling and forecasting technology. Journal of Yunnan University of Technology, 1998, 14 (3): 69 Liao Degang. The research and development status of open CNC system. mechanical,

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