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Energy
Loss in Wheel Bearings
Abstract
The relatively low power available from the
human power-plant makes it essential to minimize energy losses in bicycle components.
Similar considerations apply to the power train of other HPVs. This
laboratory will explore the energy loss in wheel bearings of different types
by measuring the time dependence of the rotational kinetic energy of a free
spinning wheel. The wheel has weights on the spokes that permit its moment of
inertia to be changed, and the effect of this on the angular velocity change
of the wheel will be examined. In addition to bearing friction, aerodynamic
drag on the tire and spokes will be an additional source of energy loss. The
bearing types to be explored also occur in the pedals, bottom bracket, and gear
wheels in the transmission. |
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