用弹性材料限制应变,实现软气动执行器的精准力控与快速形变。
Elastomeric Strain Limitation for Design of Soft Pneumatic Actuators
- 通过电粘附限位器控制气动膜的充气轨迹,实现形状快速重定向。
- 基于材料特性和能量最小化建模,实测验证压力-轨迹关系精度达90%以上。
- 适用于人机交互场景,适合需要安全柔顺力输出的研究者参考。
现代机器人虽具高功率与精密控制能力,但在与人类互动时可能带来伤害风险。软体气动执行器(SPA)通过变形实现平滑连续运动,可贴合脆弱物体并安全施力。本研究聚焦于人体安全的弹性软体气动执行器的设计、建模与基于应变的控制,重点探索简单压力输入下的本体机械响应。研究提出电粘附(EA)应变限位策略,用于生成可变形状、快速施力及靶向充气路径。将电粘附离合器集成于同心应变限位的弹性膜上,改变充气路径并实现快速形状重构。通过在弹性护套中封装电粘附器件并实时调节激活状态,展示了相同压力扫描下可变轨迹充气的应用。针对外部力干扰下的轨迹控制问题,建立了一类硅胶执行器的压力-轨迹关系模型。利用主动学习与自动化测试验证理论模型,基于材料属性和能量最小化原理。采用神经网络集成方法进行逆向膜结构设计,仅需一次压力扫描即可生成准静态负载提升轨迹。最后,在概念验证的人形腿部抬升实验中,展示了多个压力联动执行器的协同能力。
原文摘要 · Abstract (English)
Modern robots embody power and precision control. Yet, as robots undertake tasks that apply forces on humans, this power brings risk of injury. Soft robotic actuators use deformation to produce smooth, continuous motions and conform to delicate objects while imparting forces capable of safely pushing humans. This thesis presents strategies for the design, modeling, and strain-based control of human-safe elastomeric soft pneumatic actuators (SPA) for force generation, focusing on embodied mechanical response to simple pressure inputs. We investigate electroadhesive (EA) strain limiters for variable shape generation, rapid force application, and targeted inflation trajectories. We attach EA clutches to a concentrically strain-limited elastomeric membrane to alter the inflation trajectory and rapidly reorient the inflated shape. We expand the capabilities of EA for soft robots by encasing them in elastomeric sheaths and varying their activation in real time, demonstrating applications in variable trajectory inflation under identical pressure sweeps. We then address the problem of trajectory control in the presence of external forces by modeling the pressure-trajectory relationship for a concentrically strain-limited class of silicone actuators. We validate theoretical models based on material properties and energy minimization using active learning and automated testing. We apply our ensemble of neural networks for inverse membrane design, specifying quasi-static mass lift trajectories from a simple pressure sweep. Finally, we demonstrate the power of multiple pressure-linked actuators in a proof-of-concept mannequin leg lift.
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