Torque Measurement
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Transcript of Torque Measurement
Torque measurement
Torque• Torque, moment, or moment of force is the
tendency of a force to rotate an object about an axis, fulcrum, or pivot.
• A torque can be thought of as a twist to an object.
• Mathematically, torque is defined as the cross product of the lever-arm distance vector and the force vector, which tends to produce rotation.
What is Dynamometer?
• A dynamometer or "dyno" for short, is a device for measuring force, torque, or power. For example, the power produced by an engine, motor or other rotating prime mover can be calculated by simultaneously measuring torque and rotational speed (RPM).
• A dynamometer is an apparatus that measures mechanical force i.e. frictional resistance.
• Knowing the frictional resistance, we may obtain The torque transmitted The power of engine
Types of Dynamometer
Basic types:• Absorption Dynamometer• Transmission Dynamometer• Driving Dynamometer
Some Other Types are:• Water Brake Dynamometer• Eddy Current Dynamometer• D.C. Dynamometer• A.C. Dynamometer
Prony brake Dynamometer
Transmission Dynamometer
• In transmission dynamometer, principle involved is that the power measured being transmitted either to or from the dynamometer is not absorbed or dissipated.
• The power after measurement is available in useful mechanical or electrical form
Types of Transmission Dynamometer
• Epicyclic – train Dynamometer • Belt transmission Dynamometer• Torsion Dynamometer
Torque measurements on (Transmission Dynamometer)
Driving Dynamometer
• D.C. Electric type dynamometers so called Cradled dynamometer are widely used for power & torque measurement of IC engines & other mechanical equipments
• The basic arrangement is shown in figure:
Some facts :
• The D.C. machine can act as both generator and motor. Thus , the D.C. machine can act both as absorption dynamometer and a transmission dynamometer
• When D.C. machine is made to work as a dc motor, it acts as driving dynamometer
Electrical Dynamometer Setup
(showing engine, torque measurement arrangement and tachometer)