提出考虑迟滞特性的神经网络模型,提升软体机器人控制精度
Hysteresis-Aware Neural Network Modeling and Whole-Body Reinforcement Learning Control of Soft Robots
- 构建考虑迟滞的全身体神经网络模型,精准捕捉运动特性
- 相比传统方法,误差降低84.95%,实机轨迹跟踪误差仅0.126–0.250 mm
- 适用于外科手术等需高精度交互的复杂场景
软体机器人具有固有的柔性和安全性,特别适合需要与人类直接物理交互的应用,如手术操作。然而,其由柔性材料特性引起的非线性与迟滞行为,给精确建模与控制带来巨大挑战。本研究针对手术应用设计了一种软体机器人系统,提出一种考虑迟滞特性的全身神经网络模型,可准确捕捉并预测软体机器人的整体运动,包括迟滞效应。基于该高精度动力学模型,构建了高度并行的仿真环境,并采用基于策略的强化学习算法高效训练全身运动控制策略。基于训练好的控制策略,开发了用于手术应用的软体机器人系统,并在物理环境中通过基于假体的激光消融实验进行了验证。结果表明,相比传统建模方法,该迟滞感知模型使均方误差(MSE)降低84.95%。部署的控制算法在真实软体机器人上实现了0.126至0.250毫米的轨迹跟踪误差,展现了实际环境中的高精度。所提方法在假体手术实验中表现优异,展现出未来临床应用的潜力。
原文摘要 · Abstract (English)
Soft robots exhibit inherent compliance and safety, which makes them particularly suitable for applications requiring direct physical interaction with humans, such as surgical procedures. However, their nonlinear and hysteretic behavior, resulting from the properties of soft materials, presents substantial challenges for accurate modeling and control. In this study, we present a soft robotic system designed for surgical applications and propose a hysteresis-aware whole-body neural network model that accurately captures and predicts the soft robot's whole-body motion, including its hysteretic behavior. Building upon the high-precision dynamic model, we construct a highly parallel simulation environment for soft robot control and apply an on-policy reinforcement learning algorithm to efficiently train whole-body motion control strategies. Based on the trained control policy, we developed a soft robotic system for surgical applications and validated it through phantom-based laser ablation experiments in a physical environment. The results demonstrate that the hysteresis-aware modeling reduces the Mean Squared Error (MSE) by 84.95 percent compared to traditional modeling methods. The deployed control algorithm achieved a trajectory tracking error ranging from 0.126 to 0.250 mm on the real soft robot, highlighting its precision in real-world conditions. The proposed method showed strong performance in phantom-based surgical experiments and demonstrates its potential for complex scenarios, including future real-world clinical applications.
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