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首页> 外文期刊>IEEE Transactions on Control Systems Technology >Repetitive Process Control of Additive Manufacturing With Application to Laser Metal Deposition
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Repetitive Process Control of Additive Manufacturing With Application to Laser Metal Deposition

机译：增材制造的重复过程控制及其在激光金属沉积中的应用

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摘要

Additive manufacturing (AM) is a set of manufacturing processes that have promise in the production of complex, functional structures that cannot be fabricated with conventional manufacturing, and in the repair of high-value parts. However, a significant challenge to the adoption of AM processes to these applications is proper process control. Because AM processes exhibit dynamics in two dimensions-within a layer and from one layer to the next-unconventional tools are needed to enable the necessary process control. Here, stability analysis and control design are presented for the laser metal deposition (LMD) process, based on a previously developed 2-D modeling framework. Linear repetitive process results are extended in order to analyze the stability of this class of systems. A layer-to-layer process controller is developed using a spatial dynamic model of the process and layer-domain closed-loop poles. The stability analysis and control methodology are applied to the LMD process, which is known to exhibit layer-to-layer instability in both open-loop and in-process control depositions. Walls are experimentally fabricated using constant process parameters and the proposed control methodology. The results demonstrate that the proposed control methodology is able to track the reference height and remove the unstable ripple dynamic that naturally occurred in the open-loop deposition.
机译：增材制造（AM）是一组制造过程，这些过程在生产复杂的功能性结构方面很有前途，而这些功能性结构是常规制造无法制造的，并且在高价值零件的维修中也是如此。但是，对这些应用程序采用AM流程的一个重大挑战是适当的流程控制。由于AM过程在一个层面上以及从一层到下一层都在二维上表现出动态，因此需要非常规工具来实现必要的过程控制。在此，基于先前开发的2D建模框架，介绍了激光金属沉积（LMD）工艺的稳定性分析和控制设计。为了分析此类系统的稳定性，扩展了线性重复过程的结果。使用过程和层域闭环极点的空间动态模型来开发层到层过程控制器。稳定性分析和控制方法应用于LMD工艺，该工艺在开环和工艺控制沉积中均表现出层到层的不稳定性。使用恒定的工艺参数和建议的控制方法通过实验方法制造墙体。结果表明，所提出的控制方法能够跟踪参考高度并消除在开环沉积中自然发生的不稳定波动动态。

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