An Uncontrolled Toy That Can Walk But Cannot Stand Still

Details An Uncontrolled Toy That Can Walk But Cannot Stand Still An Uncontrolled Toy That Can Walk But Cannot Stand Still

1997-11-10

arxiv.org/abs/physics/9711006v3

Physics

Classical Physics

4 pages, 2 Encapsulated Postscript figures, uses epsf.tex, revtex.sty, amsfonts.sty, aps.sty, aps10.sty, prabib.sty; Submitted

Scientific paper

We built a simple two-leg toy that can walk stably with no control system. It walks downhill powered only by gravity. It seems to be the first McGeer-like passive-dynamic walker that is statically unstable in all standing positions, yet is stable in motion. It is one of few known mechanical devices that are stable near a statically unstable configuration but do not depend on spinning parts. Its design is loosely based on simulations which do not predict its observed stability. Its motion highlights the possible role of uncontrolled nonholonomic mechanics in balance.

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