In Process Identification and Correction of Weld Perturbations

本课题研究焊接过程的动态控制。研究的目的是研究焊接过程中两个变量的同时自适应控制。这将通过使用先进的红外传感技术来监测焊接池附近的热场来实现。虽然理论解决方案和实验结果都足以实现对一个焊接变量（如焊缝跟踪）的动态控制，但同时识别、分类和校正两个或多个扰动在理论和实践分析中提出了一个巨大的问题。这项研究将开发理论和实验工具来识别、分类和理解由于同时遇到两个或更多缺陷而导致的表面温度分布的变化。将提出传热的理论模型来描述过程中同时扰动的表面温度分布。将开发热场分析和控制响应的计算机层次方法。这项研究的最终结果将是科学基础的进步，在此基础上，未来的机器可能会被生产出来，能够消除有缺陷的焊缝，提高焊接过程的生产率。

This project deals with the dynamic control of the welding process. The objective of the research is to investigate simultaneous adaptive control over two variables of the welding process. This will be accomplished by using advanced infrared sensing techniques to monitor the thermal field in the vicinity of the weld pool. While both theoretical solutions and experiment agree sufficiently to enable dynamic control of one weld variable such as seam tracking, the simultaneous identification, sorting and correction of two or more perturbations presents an immense problem in theoretical and practical analysis. This research will develop theoretical and experimental tools to identify, sort and understand changes in surface temperature distributions resulting from the simultaneous encountering of two or more defects. Theoretical models of heat transfer will be advanced to describe the surface temperature distribution for simultaneous perturbations in the process. Computer hierarchial methods of analyzing the thermal fields and the implementation of the control responses will be developed. The ultimate result of this research will be the advancement of the scientific basis upon which future machines may be produced that are capable of eliminating defective welds and increasing the productivity of the welding process.