✖Indicated Mean Effective Pressure is the average pressure acting on a piston during the different portions of its cycle.ⓘ Indicated Mean Effective Pressure [P_ime]			+10% -10%
✖Brake Mean Effective Pressure is a calculation of the engine cylinder pressure that would give the measured brake horsepower.ⓘ Brake Mean Effective Pressure [P_mb]			+10% -10%

✖Frictional Mean Effective Pressure is the mean effective pressure lost due to friction.ⓘ Frictional mean effective pressure [P_fme]

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Formula

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Frictional mean effective pressure

Formula

`"P"_{"fme"} = "P"_{"ime"}-"P"_{"mb"}`

Example

`"50Pa"="400Pa"-"350Pa"`

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Frictional mean effective pressure Solution

STEP 0: Pre-Calculation Summary

Formula Used

Frictional Mean Effective Pressure = Indicated Mean Effective Pressure-Brake Mean Effective Pressure
P_fme = P_ime-P_mb
This formula uses 3 Variables

Variables Used

Frictional Mean Effective Pressure - (Measured in Pascal) - Frictional Mean Effective Pressure is the mean effective pressure lost due to friction.
Indicated Mean Effective Pressure - (Measured in Pascal) - Indicated Mean Effective Pressure is the average pressure acting on a piston during the different portions of its cycle.
Brake Mean Effective Pressure - (Measured in Pascal) - Brake Mean Effective Pressure is a calculation of the engine cylinder pressure that would give the measured brake horsepower.

STEP 1: Convert Input(s) to Base Unit

Indicated Mean Effective Pressure: 400 Pascal --> 400 Pascal No Conversion Required
Brake Mean Effective Pressure: 350 Pascal --> 350 Pascal No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

P_fme = P_ime-P_mb --> 400-350

Evaluating ... ...

P_fme = 50

STEP 3: Convert Result to Output's Unit

50 Pascal --> No Conversion Required

FINAL ANSWER

50 Pascal <-- Frictional Mean Effective Pressure

(Calculation completed in 00.022 seconds)

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Created by Syed Adnan

Ramaiah University of Applied Sciences (RUAS), bangalore

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Verified by Anshika Arya

National Institute Of Technology (NIT), Hamirpur

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< 24 For 4 Stroke Engine Calculators

Volumetric efficiency of IC engine

Go Volumetric Efficiency of IC Engine = (Air Mass Flow Rate*Crankshaft Revolutions per Power Stroke)/(Air Density at Intake*Theoretical Volume of Engine*Engine Speed)

Rate of heat conduction of engine wall

Go Rate of Heat Conduction of Engine Wall = ((Thermal Conductivity of Material)*Surface Area of Engine Wall*Temperature Difference across Engine Wall)/Thickness of Engine Wall

Indicated Power of Four-stroke Engine

Go Indicated Power = (Number of Cylinders*Mean Effective Pressure*Stroke Length*Area of Cross Section*(Engine Speed))/(2)

Brake power measured with dynamo meter

Go Brake Power = (pi*Pulley Diameter*(Engine Speed*60)*(Dead Weight-Spring Scale Reading))/60

Volumetric Efficiency for 4S engines

Go Volumetric Efficiency = ((2*Air Mass Flow Rate)/(Air Density at Intake*Piston Swept Volume*(Engine Speed)))*100

Brake Mean Effective Pressure of 4S Engines given Brake power

Go Brake Mean Effective Pressure = (2*Brake Power)/(Stroke Length*Area of Cross Section*(Engine Speed))

Fuel conversion efficiency

Go Fuel Conversion Efficiency = Work Done per Cycle in IC Engine/(Mass of Fuel Added per Cycle*Heating Value of the Fuel)

Bmep given engine torque

Go Brake Mean Effective Pressure = (2*pi*Engine Torque*Engine Speed)/Mean Piston Speed

Combustion efficiency

Go Combustion Efficiency = Heat Added by Combustion per Cycle/(Mass of Fuel Added per Cycle*Heating Value of the Fuel)

Work done per cycle in ic engine

Go Work Done per Cycle in IC Engine = (Indicated Engine Power*Crankshaft Revolutions per Power Stroke)/Engine RPM

Intake air mass of engine cylinder

Go Mass of Air at Intake = (Air Mass Flow Rate*Crankshaft Revolutions per Power Stroke)/Engine RPM

Displaced volume in engine cylinder

Go Displaced Volume = (Piston Stroke*pi*(Engine Cylinder Bore in Meter^2))/4

Intake air density

Go Air Density at Intake = Intake Air Pressure/([R]*Intake Air Temperature)

Thermal efficiency of IC engine

Go Thermal Efficiency of IC Engine = Work Done per Cycle in IC Engine/Heat Added by Combustion per Cycle

Indicated mean effective pressure given mechanical efficiency

Go Indicated Mean Effective Pressure = Brake Mean Effective Pressure/Mechanical Efficiency of IC Engine

Frictional mean effective pressure

Go Frictional Mean Effective Pressure = Indicated Mean Effective Pressure-Brake Mean Effective Pressure

Volumetric efficiency of IC engine given actual volume of engine cylinder

Go Volumetric Efficiency of IC Engine = Actual Volume of Intake Air/Theoretical Volume of Engine

Connecting Rod Length to Crank Radius Ratio

Go Connecting Rod Length to Crank Radius Ratio = Connecting Rod Length/Crank Radius of Engine

Ratio of cylinder bore to piston stroke

Go Connecting Rod Length to Crank Radius Ratio = Connecting Rod Length/Crank Radius of Engine

Total cylinder volume of IC engine

Go Total Volume of an Engine = Total Number of Cylinders*Total Volume of Engine Cylinder

Fuel conversion efficiency given thermal conversion efficiency

Go Fuel Conversion Efficiency = Combustion Efficiency*Thermal Conversion Efficiency

Actual intake air volume per cylinder

Go Actual Volume of Intake Air = Mass of Air at Intake/Air Density at Intake

Frictional power of engine

Go Frictional Power of Engine = Indicated Power-Brake Power

Horsepower of engine

Go Horsepower of Engine = (Engine Torque*Engine RPM)/5252

Frictional mean effective pressure Formula

Frictional Mean Effective Pressure = Indicated Mean Effective Pressure-Brake Mean Effective Pressure
P_fme = P_ime-P_mb

Explain frictional mean effective pressure.

Theoretical mean effective pressure required to overcome engine friction, can be thought of as mean effective pressure lost due to friction. Friction mean effective pressure calculation requires accurate measurement of cylinder pressure and dynamometer brake torque.

How to Calculate Frictional mean effective pressure?

Frictional mean effective pressure calculator uses Frictional Mean Effective Pressure = Indicated Mean Effective Pressure-Brake Mean Effective Pressure to calculate the Frictional Mean Effective Pressure, The Frictional mean effective pressure formula is defined as the effective pressure in the engine cylinder that is lost due to friction between reciprocating parts of the engine. Frictional Mean Effective Pressure is denoted by P_fme symbol.

How to calculate Frictional mean effective pressure using this online calculator? To use this online calculator for Frictional mean effective pressure, enter Indicated Mean Effective Pressure (P_ime) & Brake Mean Effective Pressure (P_mb) and hit the calculate button. Here is how the Frictional mean effective pressure calculation can be explained with given input values -> 50 = 400-350.

FAQ

What is Frictional mean effective pressure?

The Frictional mean effective pressure formula is defined as the effective pressure in the engine cylinder that is lost due to friction between reciprocating parts of the engine and is represented as P_fme = P_ime-P_mb or Frictional Mean Effective Pressure = Indicated Mean Effective Pressure-Brake Mean Effective Pressure. Indicated Mean Effective Pressure is the average pressure acting on a piston during the different portions of its cycle & Brake Mean Effective Pressure is a calculation of the engine cylinder pressure that would give the measured brake horsepower.

How to calculate Frictional mean effective pressure?

The Frictional mean effective pressure formula is defined as the effective pressure in the engine cylinder that is lost due to friction between reciprocating parts of the engine is calculated using Frictional Mean Effective Pressure = Indicated Mean Effective Pressure-Brake Mean Effective Pressure. To calculate Frictional mean effective pressure, you need Indicated Mean Effective Pressure (P_ime) & Brake Mean Effective Pressure (P_mb). With our tool, you need to enter the respective value for Indicated Mean Effective Pressure & Brake Mean Effective Pressure and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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