Reproduce “MuJoCable: Reduced-Order Surface-Routed Cable Transmission for Tendon-Driven Robots” on OpenResearch
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About this paper
Yi Zhang, Qi Shao, Yicong Lin, Muyuan Ma, Tao Sun, Yue Xie
MuJoCable adds a reduced-order, route-aware cable model to MuJoCo for tendon-driven robots. By solving moving contact paths over analytic and mesh surfaces, enforcing unilateral tension, and propagating friction-induced segment tensions, it captures transmission effects that fixed tendon models omit while increasing simulation step time by 22.5%; experiments reproduce analytical pulley behavior and reveal substantial friction-driven changes in robot motion and actuator load.
Key insights
- Cable routing is part of the robot’s mechanics: even with similar overall poses, route-aware modeling can predict substantially different internal tensions and cable take-up than native tendon models.
- Friction redistributes underactuated motion toward proximal joints, reduces distal motion, and simultaneously increases actuator-side tension, so it affects both robot posture and hardware sizing.
- A reduced-order model can retain the dominant transmission effects without modeling cable bending, mass, or wave propagation, making it suitable for many taut cable-driven mechanisms but not for slack, buckling, or high-frequency cable dynamics.
Summary by alphaXiv.
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