Dynamometer

Dyno

Hand dynamometer

Hydraulic dynamometer (Rankin Kennedy, Modern Engines, Vol VI)

Dynamometer01CJC

Tech-Talk Animation on How Water-Brakes Work

Dynamometer is a device used for measuring force, torque, or power. For example, the power output of an engine, motor or other rotating prime mover can be calculated by simultaneously measuring torque and rotational speed (RPM). Dynamometers are employed in a wide range of applications, including engine testing, component testing, and human performance testing in sports science.

Types of Dynamometers

Dynamometers can be broadly classified into two categories based on their operation: absorption and transmission dynamometers.

Absorption Dynamometers

Absorption dynamometers measure power by dissipating the output as heat. The most common types include:

• Hydraulic Dynamometers: Utilize water or other fluids to absorb power. The power is dissipated through fluid friction.
• Eddy Current Dynamometers: Use electromagnetic fields to produce resistance against the rotating shaft.
• Prony Brake: The simplest form of an absorption dynamometer, where friction is applied to a rotating drum to measure torque.

Transmission Dynamometers

Transmission dynamometers, on the other hand, measure power by transferring it from the input to the output without significant loss. These include:

• Torque Meters: Directly measure the torque applied on a shaft.
• Torsion Dynamometers: Measure the twisting moment or torque on a rotating system, such as a shaft.

Applications

Dynamometers are used in a variety of applications:

• Engine and Powertrain Testing: To measure engine output and efficiency.
• Component Testing: To test the durability and performance of components under various conditions.
• Rehabilitation and Sports Science: To measure the strength and endurance of muscles or athletes.

Advantages and Limitations

The primary advantage of using a dynamometer is the ability to accurately measure the performance characteristics of a machine or component under controlled conditions. However, the accuracy of these measurements can be affected by factors such as calibration, environmental conditions, and the dynamometer's design.

See Also

• Torque
• Power (physics)
• Engine
• Motor

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