arXiv:2503.07528eess.SYcs.LG2025-03

用深度学习加速液压系统结构变形实时估算,快百万倍。

Real-Time Structural Deflection Estimation in Hydraulically Actuated Systems Using 3D Flexible Multibody Simulation and DNNs

  • 结合3D柔性多体仿真与神经网络,通过随机工况采集数据训练模型。
  • 相比传统仿真提速10^7倍,保持合理精度,支持实时控制。
  • 适合机器人、重型机械健康监测与自动化系统研发者参考。

轻质高强度钢制结构在重型机械中因高度非线性动力学影响,导致控制困难、仿真耗时,常规方法难以实现实时自主。本文提出一种基于机器学习的新型框架,用于估算液压驱动三维系统的实时结构变形。该框架基于SLIDE方法,可估计受迫激励下机械系统的动态响应,并设计算法通过随机初始配置和液压压力采集数据。在液压驱动柔性吊臂上测试,采用多种传感器组合与负载。神经网络使用PyTorch标准参数、ADAM优化器,在少量输出数据下快速训练成功。经验证,该方法相比柔性多体仿真批次提速10^7倍,同时保持合理精度,支持控制、机器人操作臂、结构健康监测与自动化问题的鲁棒实时解决方案。

原文摘要 · Abstract (English)

The precision, stability, and performance of lightweight high-strength steel structures in heavy machinery is affected by their highly nonlinear dynamics. This, in turn, makes control more difficult, simulation more computationally intensive, and achieving real-time autonomy, using standard approaches, impossible. Machine learning through data-driven, physics-informed and physics-inspired networks, however, promises more computationally efficient and accurate solutions to nonlinear dynamic problems. This study proposes a novel framework that has been developed to estimate real-time structural deflection in hydraulically actuated three-dimensional systems. It is based on SLIDE, a machine-learning-based method to estimate dynamic responses of mechanical systems subjected to forced excitations.~Further, an algorithm is introduced for the data acquisition from a hydraulically actuated system using randomized initial configurations and hydraulic pressures.~The new framework was tested on a hydraulically actuated flexible boom with various sensor combinations and lifting various payloads. The neural network was successfully trained in less time using standard parameters from PyTorch, ADAM optimizer, the various sensor inputs, and minimal output data. The SLIDE-trained neural network accelerated deflection estimation solutions by a factor of $10^7$ in reference to flexible multibody simulation batches and provided reasonable accuracy. These results support the studies goal of providing robust, real-time solutions for control, robotic manipulators, structural health monitoring, and automation problems.

结构变形实时估算液压系统神经网络

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