ROBUST CONTROL OF GAS TUNGSTEN ARC WELDING SYSTEM |
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| Authors: | WU Junfeng CHEN Shanben ZHANG Mingjun |
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| Affiliation: | [1]Department of Automation, Harbin University of Science and Technoiogy, Harbin 150080. China [2]Institute of Mechanics and Electricity, Harbin University of Engineering, Harbin 150010, China [3]Welding Institute, Shanghai Jiaotong University, Shanghai 200030, China [4]nstitute of Mechanics and EIectrcity, Harbin University of Engineering, Harbin 150010. China |
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| Abstract: | The robust control law for gas tungsten arc welding dynamic process, which is a typical sampled-data system and full of uncertainties, is presented. By using the Lyapunov second method, the robust control and robust optimal control for a class of sampled-data systems whose underlying continuous-time systems are subjected to structured uncertainties are discussed in time-domain. As a result, some sufficient conditions of robust stability and the corresponding robust control laws are derived. All these results are designed by solving a class of linear matrix inequalities (LMIs) and a class of dynamic optimization problem with LMIs constraints respectively. An example adapted under some experimental conditions in the dynamic process of gas tungsten arc welding system in which the controlled variable is the backside width of weld pool and controlling variable pulse duty ratio, is worked out to illustrate the proposed results, it is shown that the sampling period is the crucial design parameter. |
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| Keywords: | Sampled-data system Robust control Linear matrix inequalities (LMIs) Weld pool Pulse duty ratio SYSTEM GAS TUNGSTEN ARC WELDING CONTROL sampling period design parameter example experimental conditions controlled width weld pool controlling variable pulse ratio dynamic optimization problem constraints |
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