Design of a model based feedforward controller for additive manufacturing by laser metal deposition
Design of a model based feedforward controller for additive manufacturing by laser metal deposition
复制标题
基于模型的激光金属沉积增材制造前馈控制器设计
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
M. Mönnigmann
中科院分区：
文献类型：
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作者：
David Dillkötter;M. Mönnigmann
激光金属沉积，也称为激光熔覆或直接金属沉积，是一种新兴的增材制造技术，用于制造固体3d零件。我们提出了一种基于热传导方程的第一性原理模型的熔池宽度前馈控制器。从本质上讲，它将激光功率调整到机器所采用的路径，从而使用另一种在生产过程中通常保持不变的输入。该控制器是为了兼容现有的激光金属沉积计算机数控（CNC）而构建的。这是通过设计前馈控制器来兼容数控机床的标准编程语言G-code来实现的。由于g代码不是基于时间步长或采样频率，而是基于速度和位置信号，因此必须特别注意确保所提出的基于模型的离散时间前馈控制器与现有数控机床控制的兼容性。所提出的控制器在基准场景中进行了评估，在不需要任何额外传感器的情况下显示出良好的性能。
Laser metal deposition, also known as laser cladding or direct metal deposition, is an emerging additive manufacturing technology for the creation of solid 3D-parts. We propose a feedforward controller for the melt pool width that is derived from a first principle model based on the heat conduction equation. Essentially, it adjusts the laser power to the path taken by the machine, thus using another input that is usually kept constant during a production process. The controller is constructed for compatibility with existing computerized numerical control (CNC) for laser metal deposition. This is accomplished by designing the feedforward controller for compatibility with G-code, the standard programming language for CNC machines. Since G-code is not based on time steps or a sampling frequency but, roughly speaking, on velocity and position signals, special care must be taken to ensure compatibility of the proposed model-based discrete-time feedforward controller and the existing CNC machine control. The presented controller is evaluated with a benchmark scenario, where it shows good performance without the need for any additional sensors.