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How do Prony Brake dynamometer works?


How do Prony Brake dynamometer works?

The Prony Brake is an early dynamometer developed by Prony in the early 1800’s. It is composed of brake blocks that press against the rotating wheel attached to the motor. These blocks create a friction force, or Traction force T, that slows the velocity (V) of the wheel.

What does a Prony Brake dynamometer measures?

The Prony brake is a simple type of dynamometer used to measure the amount of torque produced by a motor or engine in order to determine its brake horsepower rating. A tension band is also attached to the pulley in order to apply braking force to the output shaft of the engine being tested.

What is the principle of working of an absorption dynamometer?

In an engine dynamometer, water flow, proportional to the desired applied load, creates resistance to the engine. A controlled water flow through the inlet manifold is directed at the center of the rotor in each absorption section. This water is then expelled to the outer dynamometer body by centrifugal force.

How does a hydraulic dynamometer work?

Hydraulic dynamometer: It works on the principle of dissipating heat in the fluid friction rather than dry friction. Its construction is similar to that of the fluid wheel and it consists of an impeller coupled to the output shaft of the engine. The impeller rotates inside a casing filled with fluid.

How is brake power measured?

(Power is calculated by multiplying torque by rotational speed.) Essentially the measurement is made by wrapping a cord or belt around the output shaft of the engine and measuring the force transferred to the belt through friction.

What is the use of hydraulic dynamometer?

Hydraulic dynamometers are used to measure the force, torque, and power that is produced by different types of engines, motors and other varieties of rotating movers. Power is capable of being calculated by measuring rotational speed.

What kind of dynamometer is a Prony brake?

Prony brake dynamometer Construction & Working : • A simplest form of an Absorption type Dynamometer is a Prony Brake Dynamometer . It consists of Two wooden blocks around a Pulley fixed to the shaft of an engine , whose power is required to be measured . The blocks are clamped by means of Two Bolts and Nuts .

How are dynamometers used to determine engine power?

By know ing frictional resistance we can determine the torque transmitted and hence the power of the engine. 3. Types of dynamometers: 1)Absorption dynamometer:  Prony brake dynamometer  Rope brake dynamometer  Hydraulic dynamometer 2) Transmission dynamometer:  Belt transmission dynamometer  Epicyclic dynamometer  Torsion dynamometer

How much power can a Hysteresis dynamometer measure?

The hysteresis dynamometer s are suitable for measurements to up to 150 kWatt, while the water brake absorber can measure machines the power of which can go up to 2500 kWatt or even more. Fig.6 Summary of the elements of a full range test..

How does a belt transmission dynamometer work?

1) Belt Transmission Dynamometer : • It consists of endless or continuous belt run over the driving pulley. • The driving pulley is rigidly fixed to the shaft of an engine whose power is to be transmitted. • The intermediate pulleys rotates on a pin fixed to a lever having a fulcrum at the midpoint of the two pulley centers.