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What are Dynamometers?

11/8/2013 7:54:21 AM | by Anonymous


Dynamometers are devices for measuring moment of force such as power or torque. For example, the power produced by a motor, engine or other rotating prime mover can be calculated by measuring simultaneously rotational speed or torque.


Dynamometers can also be used to determine the torque and power required to operate the driven machine such as a pump. In this case, the driving or motoring dynamometer is used and designed to be driven is called a passive or absorption dynamometer furthermore they can either be absorbed or drive. They are also called an active or universal dynamometer.


Additionally, dynamometers are used to determine the power or torque characteristics of a machine under test and in short are called the ‘MUT’ furthermore these dynamometers are employed in a number of other roles. They are used to provide simulated road loading of either the full power train using a chassis dynamometer or engine. They can also be used as part of a test bed for a variety of engine development activities such as the calibration of the engine management controllers or a detailed investigation into the combustion iridology and behavior.


In the medical terminology, the hand held dynamometers are used for routine screening of hand strength and grip as well as the ongoing and initial evaluation of patients with dysfunction or hand trauma. Furthermore, they can also measure the grip strength in patients where compromise of the cervical peripheral nerves or nerve roots that is suspected.


In the kinesiology, ergonomics and rehabilitation realms, the force of dynamometers are used for measuring the grip, back, arm or leg strength of the patients, athletes and workers to evaluate their physical performance, status and task demands. The force is applied to a lever or through a cable that is measured and converted to a moment of force by multiplying by the perpendicular distance from the force to the axis of the level.


Dynamometers consist of an absorption unit and are usually a means for measuring rotational and torque speed. An absorption unit consists of some type of rotor in housing and the rotor is coupled to the engine or other equipment under the test to rotate at whatever speed is required for the test. The means for developing torque can be frictional, electromagnetic, frictional, hydraulic or otherwise as according to the type of driver or absorption unit.


One means is to measure torque is to connect the engine to the dynamometer through a torque transducer or torque sensing coupling. A torque transducer can provide an electrical signal that is proportional to the torque. With the electrical absorption units, it is possible to determine the torque by measuring the current drawn by the driver or absorber.


Generally, this is a less accurate method and not much practiced in the modern times but can be adequate for some purposes. When speed signals and torque are available, the test data can be transmitted to a data acquisition system rather than being recorded manually. Torque and speed signals can also be recorded by a plotter or chart recorder.

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