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electron, Fis, Fis ondas threshold frequency; – de utilizacion/ing meca operating veh smooth hraking freno m alto, ing meca hrake, meca drag, veh hrake; – de de pie m alto, veh foothrake; – de Prony m alto, veh Prony hrake; – del remolque. PROM — memoria programable de solo lectura. prony brake — a simple friction brake dynamometer. freno prony — un dinamometro para los frenos de friccion. Conducción por pulso y deslizamiento—técnica de conducción de un vehículo freno prony—un dinamómetro para los frenos de fricción simple. propane.

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In its simplest form an engine is connected to a rotating drum by means of an output shaft. Power output in SI units may be calculated as follows:.

An alternate mechanism is to clamp a lever to the shaft and measure using a single balance. Power is calculated by multiplying torque by rotational speed. When the engine is running, the frictional force between the drum and the band freon increase the force reading on one balance and decrease it frno the other.


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Prony brake

The Prony Brake is a simple device invented by Gaspard de Prony to measure the torque produced by an engine. Essentially the measurement is made by wrapping a df or belt around the output shaft of the engine and measuring the force transferred to the belt through friction.

A friction band is wrapped around half the drum’s circumference and each end attached to a separate spring balance. The term ” brake horsepower ” is one measurement of power derived from this method of measuring torque.

The torque is then related to the lever length, shaft diameter and measured force.

In practice more engine power can then be applied until the limit of the engine is reached. A substantial pre-load is then applied to the ends of the band, so that each spring balance has an initial and identical reading.


File:Prony – Wikimedia Commons

This page was last edited on 23 Octoberat Views Read Edit View history. The difference between the two readings multiplied by the radius of the driven drum is equal to the torque. The friction is increased by tightening the belt until the frequency of rotation of the shaft is reduced.

The device is generally used over a range of engine speeds to obtain power and torque curves for the engine, since there is a non-linear relationship between torque and engine speed for most engine types.

This technology-related article is a stub. You can help Wikipedia by expanding it. If the engine speed is measured with a tachometerthe brake horsepower is easily calculated.