arXiv:2512.00907cs.RO2025-12

软机器人集成磁性触觉传感,实现自适应抓取与物体硬度无损评估。

Magnetic Tactile-Driven Soft Actuator for Intelligent Grasping and Firmness Evaluation

  • 通过共用结构融合驱动与触觉传感,解决形变干扰信号问题。
  • 对杏子测试显示硬度预测与参考值相关性达0.8以上。
  • 适合需要感知材料特性的智能柔性抓取场景。

软体机器人在操作易碎物品方面具有优势,但其应用受限于两个关键问题:缺乏集成式触觉传感,以及执行器形变导致的传感器信号失真。本文提出SoftMag:一种磁性触觉传感的软体驱动器。与依赖外置传感器或分离设计的系统不同,SoftMag通过共享架构统一驱动与传感,并克服了由机械寄生效应引起的信号污染问题。研究构建了多物理场仿真框架以建模该耦合关系,并采用神经网络方法实现信号解耦,恢复传感精度。实验涵盖压痕、准静态与阶跃驱动、疲劳测试,验证了驱动器性能及解耦有效性。在此基础上,构建双指软体夹持器,利用多任务神经网络实时预测三轴接触力与位置;同时提出探测策略,在抓取过程中估算物体硬度。在杏子上的验证显示,夹持器估计的硬度与标准测量值具有显著相关性(皮尔逊相关系数r > 0.8),证实系统具备非破坏性质量评估能力。结果表明,集成磁性传感、学习驱动修正与实时推理的结合,使软体机器人能自适应抓握并量化材料属性。该框架为发展感知型智能软体机器人提供了新路径。

原文摘要 · Abstract (English)

Soft robots are powerful tools for manipulating delicate objects, yet their adoption is hindered by two gaps: the lack of integrated tactile sensing and sensor signal distortion caused by actuator deformations. This paper addresses these challenges by introducing the SoftMag actuator: a magnetic tactile-sensorized soft actuator. Unlike systems relying on attached sensors or treating sensing and actuation separately, SoftMag unifies them through a shared architecture while confronting the mechanical parasitic effect, where deformations corrupt tactile signals. A multiphysics simulation framework models this coupling, and a neural-network-based decoupling strategy removes the parasitic component, restoring sensing fidelity. Experiments including indentation, quasi-static and step actuation, and fatigue tests validate the actuator's performance and decoupling effectiveness. Building upon this foundation, the system is extended into a two-finger SoftMag gripper, where a multi-task neural network enables real-time prediction of tri-axial contact forces and position. Furthermore, a probing-based strategy estimates object firmness during grasping. Validation on apricots shows a strong correlation (Pearson r over 0.8) between gripper-estimated firmness and reference measurements, confirming the system's capability for non-destructive quality assessment. Results demonstrate that combining integrated magnetic sensing, learning-based correction, and real-time inference enables a soft robotic platform that adapts its grasp and quantifies material properties. The framework offers an approach for advancing sensorized soft actuators toward intelligent, material-aware robotics.

软体机器人触觉传感硬度评估磁性驱动

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