激光粉末床熔合前馈控制的经验模型
An empirical model for feedforward control of laser powder bed fusion
摘要：
虽然最近在激光粉末床熔合（LPBF）的实时熔池监测方面取得了相当大的进展，但原位熔池控制的结果相对较少，主要原因是缺乏合适的面向控制的模型。本研究展示了一个经验控制导向模型的几何形状相关的熔池行为，随后熔池调节与基于模型的前馈控制器的激光功率。首先，它表明，当扫描线变得更短时，熔池“足迹”呈指数增加。这种行为的经验模型的开发和验证不同的几何形状在不同的激光功率水平。其次，所开发的模型被用来设计一个前馈控制器，以获得最佳的激光功率分布。该控制器，然后通过实验验证，并证明抑制层内几何形状相关的熔池信号偏差，为不同的零件几何形状。
英文摘要：
While considerable progress has recently been made in real-time melt pool monitoring for laser powder bed fusion (LPBF), results in in-situ melt pool control are relatively sparse, a major reason being lack of suitable control-oriented models. This study demonstrates an empirical control-oriented model of geometry-dependent melt pool behavior, and subsequent melt pool regulation with a model-based feedforward controller for laser power. First, it shows that the melt pool "footprint" exponentially increases when the scan lines become shorter. The empirical model of this behavior is developed and validated on different geometries at different laser power levels. Second, the developed model is used to design a feedforward controller for obtaining optimal laser power profiles. This controller is then validated experimentally and is demonstrated to suppress the in-layer geometry-related melt pool signal deviations, for different part geometries.
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