粉末床熔融增材制造中的温度状态在结构上是可控和可观察的
Temperature states in Powder Bed Fusion additive manufacturing are structurally controllable and observable
摘要：
粉末床融合（PBF）是一种增材制造（AM）技术，通过激光或电子束热源的选择性熔化作用，以逐层方式从金属粉末床中构建零件。该技术已经变得广泛，然而，对PBF系统中的闭环过程监测和控制的需求正在增长，以取代当今存在的开环体系结构。基于控制的模型有可能通过利用计算上易于处理的简化模型来满足这一需求，同时还减少了与这些模型相关的误差。本文介绍了PBF过程的控制理论分析，证明了PBF模型是渐近稳定的，可镇定的，和可检测的。我们表明，PBF的线性模型是结构可控和结构可观察的，只要构建的任何部分暴露于能源和测量，我们提供的条件，时不变PBF模型是经典的可控/可观察的，我们证明了执行状态估计和控制时不变系统的能量要求。因此，本文提出了一种有效的手段，实现闭环PBF质量控制的基础。
英文摘要：
Powder Bed Fusion (PBF) is a type of Additive Manufacturing (AM) technology that builds parts in a layer-by-layer fashion out of a bed of metal powder via the selective melting action of a laser or electron beam heat source. The technology has become widespread, however the demand is growing for closed loop process monitoring and control in PBF systems to replace the open loop architectures that exist today. Controls-based models have potential to satisfy this demand by utilizing computationally tractable, simplified models while also decreasing the error associated with these models. This paper introduces a controls theoretic analysis of the PBF process, demonstrating models of PBF that are asymptotically stable, stabilizable, and detectable. We show that linear models of PBF are structurally controllable and structurally observable, provided that any portion of the build is exposed to the energy source and measurement, we provide conditions for which time-invariant PBF models are classically controllable/observable, and we demonstrate energy requirements for performing state estimation and control for time-invariant systems. This paper therefore presents the foundation for an effective means of realizing closed loop PBF quality control.
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