热的
机械工程
传热
多元微积分
计算机科学
传递函数
消隐
快速成型
过程(计算)
控制理论(社会学)
材料科学
工程类
控制工程
机械
控制(管理)
电气工程
人工智能
气象学
物理
操作系统
作者
Nikolaos Fourligkas,Charalabos C. Doumanidis
出处
期刊:Journal of Manufacturing Science and Engineering-transactions of The Asme
[ASME International]
日期:1999-08-01
卷期号:121 (3): 440-447
被引量:3
摘要
A general thermal modeling and control methodology for thermal processing of layered materials for rapid prototyping technologies is established in this article. An analytical multivariable model of lumped temperature outputs generated by heat inputs on a surface grid is developed, based on Green’s function and state-space descriptions. The few independent parameters needed in such a linearized formulation are experimentally identified, and their time-variability reflects the heat transfer nonlinearities and process disturbances. A robust controller with thermal feedback is designed by pole placement methods, to obtain a specified dynamic temperature field yielding the desired material structure and properties. The regulated thermal processing is optimized in real time by proper heat source power modulation and torch guidance through a simulated annealing strategy. Its performance is tested on both the computer model and a laboratory station, using robotically guided plasma-arc cutting and infrared thermal sensing, in regulating the sensitized zone during blanking of an elementary contour pattern on stainless steel.
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