基于ARM的脉冲MIG焊数字化系统的研究
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摘要
数字控制具有稳定、灵活、精确、可靠、快速和集成度高等特点,为保证脉冲MIG焊的焊接工艺稳定性和工艺效果、保证焊接设备体积小质量轻等提供了必要条件。在设备研究上,国内外采用先进的数字化技术,已经实现了对焊接电源的优化与管理,提高了焊接过程的稳定性和生产效率。但从整体上看,国内的研究中,多数都将重点放在焊接电源的性能提高上,对焊接设备整体协调、人工智能及专家系统的应用、以及基于网络的多机系统的研究开展的还比较少。
     本课题在研究了现有高性能嵌入式处理器的基础上,选择了当前较流行的、具有网络应用能力的ARM9系列嵌入式芯片作为核心处理器,对脉冲MIG焊数字化系统进行了全面的规划与设计,研究了嵌入式系统在焊接电源控制、网络应用以及小型专家系统等问题上的解决方案,设计了完整的脉冲MIG焊数字化系统的应用结构模型。
     本文分析了ARM920的嵌入式处理器的内核组成结构,分析了嵌入式操作系统RTOS(本文使用的是Linux 2.4版)的基本特性,讨论了嵌入式系统的软件基本工作模式及其控制方法,并根据数字化系统设计方案,使用广州斯道S3C2410嵌入式系统普及板建立了基础实验环境,给出了基于ARM920处理器内建的四路PWM来驱动移相全桥逆变主电路的硬件结构和软件设计方法,给出了基于CS8900A网络芯片的嵌入式系统的设备硬件接口电路和驱动程序设计,给出了基于嵌入式数据库系统mSQL的网络数据库的简单应用,另外,本文还对嵌入式环境下电磁干扰和保护开展基础性的研究工作。
     将高性能ARM嵌入式系统应用MIG焊数字化系统上,在硬件上,简化了一般微机控制的体系结构,缩小了设备体积,增强了设备的适应性和可扩展性;在软件上,充分利用其操作系统资源及网络资源,能够方便的实现数据的传输和处理,为实现专家系统应用和在线升级提供了便利条件。本课题为焊接设备的数字化系统提供更符合当前应用发展的解决方案,也使网络化先进集成制造和焊接智能专家系统的提供了可能。
Digital control has the characteristics of stabilization, portability, accurateness, reliability, rapidity and highly integration, which provide necessary support to ensure the stability and technique effect of pulse MIG welding, to ensure the welding device in a small volume and with a light weight. In the device researching, based on advanced digital technique, The optimization and management of welding power has realized and was improved the stability and working efficiency of welding process. However, most research, especially in domestic field, is focused on the improvement of welding power. Further research such as collaboration of welding device, network multi-machine system, application of Artificial Intelligence system, are still in the primary stage.
     Based on the study of high-powered embedded CPU, this project chose the ARM9 embeded chip as CPU, which is widely used and has network function. The project also designed pulse MIG welding digital system, studied the solution of the embedded system application in welding power control, network application and Intelligence system, designed the application structure model of pulse MIG welding digital control system.
     This thesis analyzed the core structure of ARM920 embeded chip and basic function of RTOS embeded operation system(thesis use Linux verson2.4 as a example), discussed the software working model and control method of embedded system. According to the digital design solution, the project established the basic working environment based on Guangzhou Store S3C2410 embeded system development board, provided hardware and software design solution to drive the main circuit of phase shifting entire bridge inversion based on the four PWM in ARM920 chip, designed the driver program and the hardware device interface circuit based on CS8900A net chip, realized the application of network database based on embedded database system which is mSQL. In addition, the thesis also studied the electronmagetic interference and protection under embedded evelment.
     From the hardware point of view, the application of high-powered ARM embedded system on pulse MIG welding digital control system, reduced the architecture of microcomputer control and device volume, improved the adaptability and expansibility of the device. From software point of view, using the operating system and network resources, the system can easily realized the data process and transport, which make it much easier to the application and online update for the intelligence system. The project provide a executable solution for the digital system of welding equipment, it also provide workspace for the intelligence machine useing in net and intelligence system.
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