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Physics

Cubli: a cube balancing on its edge

A planar cube balances on an edge using a reaction wheel. Disturb the controller or launch it with a momentum-conserving wheel-brake impulse.

Cubli: a cube balancing on its edge — Actual application image
Actual application image

Try this

Balance on one edge, apply a kick or brake a precharged wheel to jump. This is the planar one-wheel model; wheel speed and motor torque are limited.

Equations used in the module
Equations
Ib θ″ = m g l sin θ − τ − b θ′
Iw ω′ = τ
Brake: Ω = (Ib θ′ + Iw ω)/(Ib + Iw)
τ = clamp(Kp θ + Kd θ′ + Kw ω)

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