Melt pool temperature modeling and control for Laser Metal Deposition processes
Melt pool temperature modeling and control for Laser Metal Deposition processes
复制标题
激光金属沉积工艺的熔池温度建模和控制
DOI：
10.1109/acc.2009.5160415
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
R. Landers
中科院分区：
文献类型：
--
作者：
Lie Tang;R. Landers
在激光金属沉积工艺中，熔池温度对沉积质量有重要影响。为了控制熔池温度，建立了熔池温度与激光功率、粉末流速和穿越速度关系的经验过程模型，并进行了实验验证。然后利用内模原理设计了通用跟踪控制器。为了检验控制器的性能，进行了两个实验，分别跟踪了恒温参考和时变参考。结果与开环实验进行了比较，其中激光功率分布直接从模型中导出。结果表明，所设计的熔池温度控制器对恒定和时变参考参数均具有良好的跟踪性能，闭环控制系统大大减小了跟踪误差。
Melt pool temperature is of great importance to deposition quality in Laser Metal Deposition processes. To control the melt pool temperature, an empirical process model describing the relation between the temperature and laser power, powder flow rate, and traverse speed is established and verified experimentally. A general tracking controller using the Internal Model Principle is then designed. To examine the controller performance, two experiments tracking a constant temperature reference and a time varying reference are conducted. The results are compared to open-loop experiments where the laser power profile is derived directly from the model. The results show the melt pool temperature controller performs well in tracking both constant and time varying references and that the closed-loop control system greatly reduces the tracking errors.