YANG Liang, HOU Liang, CHEN Yun, et al. Deep Learning-Based Algorithms for Measurement and Prediction of Cladding Layers Dimension in Directed Energy Deposition[J]. Aeronautical Manufacturing Technology, 2025, (23/24).
DOI:
YANG Liang, HOU Liang, CHEN Yun, et al. Deep Learning-Based Algorithms for Measurement and Prediction of Cladding Layers Dimension in Directed Energy Deposition[J]. Aeronautical Manufacturing Technology, 2025, (23/24). DOI: 10.16080/j.issn1671-833x.2025.23/24.135.
Deep Learning-Based Algorithms for Measurement and Prediction of Cladding Layers Dimension in Directed Energy Deposition
针对激光定向能量沉积(Laser directed energy deposition,LDED)加工过程中熔覆层尺寸难以实时监测和控制的问题,提出了一种结合CondenseNet 和门控循环单元(Gated recurrent unit,GRU)的熔覆层尺寸在线测量和预测方法。该方法主要包括两个部分:改进了CondenseNet 算法,以关键工艺参数和熔池图像为输入,在线测量熔覆层尺寸;对熔覆层尺寸进行时间序列建模,以熔覆层尺寸历史数据序列为输入,预测熔覆层未来高度。通过试验评估,该方法的熔覆层宽度测量平均百分比误差为5.68%,高度测量平均百分比误差为3.72%,且在资源受限条件下单张图像的推理时间为17.6 ms。在测量数据的基础上预测熔覆层未来高度时,高度预测的平均百分比误差为3.60%。试验结果表明,所构建模型在有限的计算资源下实现了熔覆层尺寸的高精度实时测量和预测,为激光定向能量沉积过程的监测和闭环控制提供了有效手段和数据支撑。
Abstract
To address the challenge of real-time monitoring and control of cladding layer dimensions during laser directed energy deposition (LDED)
we propose an integrated framework combining an enhanced CondenseNet architecture with gated recurrent units (GRUs) for online measurement and prediction. The framework comprises two key components: A modified CondenseNet algorithm that fuses key process parameters and melt-pool images to achieve realtime measurement of cladding layer dimensions; A temporal modeling module based on GRUs
which utilizes historical dimension sequences to predict future cladding layer height. Experimental results demonstrate an average percentage error of 5.68% for width measurements and 3.72% for height measurements
with an inference time of 17.6 ms per image under computational resource constraints. Leveraging these real-time measurements
the GRU-based predictor further achieves a height prediction error of 3.60%. The proposed framework enables high-precision
real-time monitoring of cladding layer dimensions with limited computational resources
offering a robust solution for closed-loop control in LDED processes.