Mechanical efficiency

Mechanical efficiency

Mechanical efficiency measures the effectiveness of a machine in transforming the energy and power that is input to the device into an output force and movement. Efficiency is measured as a ratio of the measured performance to the performance of an ideal machine,

\text{Efficiency} = \frac{\text{Measured Performance}}{\text{Ideal Performance}}.

The efficiency of energy conversion of the power plant of a machine is often considered separately from the efficiency of the mechanism that transmits this power to achieve a particular force and movement.

Because the power transmission system or mechanism does not generate power, its ideal performance occurs when the output power equals the input power, that is when there are no losses. Real devices dissipate power through friction, part deformation and wear.

The ideal transmission or mechanism has an efficiency of 100%, because there is no power loss. Real devices will have efficiencies less than 100% because rigid and frictionless systems do not exist. The power losses in a transmission or mechanism are eventually dissipated as heat.


See also


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