How to determinate instantaneus torque

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Discussion Overview

The discussion focuses on determining the instantaneous torque of a V12 diesel engine, exploring mathematical modeling and the necessary parameters for accurate calculations. It includes considerations of engine specifications and potential influences on torque measurement.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant suggests modeling instantaneous torque using cylinder pressure curves to calculate the force on the connecting rod, converting this into torque for each cylinder.
  • Another participant requests additional data, including compression ratio, nominal power, and speed power, to assist in the calculations.
  • A participant provides a specific V angle of 60° from a public data sheet as part of the engine's specifications.
  • There is mention of considering torsional vibration and crankshaft characteristics in the modeling process.

Areas of Agreement / Disagreement

Participants have not reached a consensus, as there are multiple approaches suggested for modeling the instantaneous torque, and further data is needed to refine the discussion.

Contextual Notes

Limitations include the need for specific engine parameters and assumptions about torsional vibrations and crankshaft properties that have not been fully defined.

dot_francesco
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Hi guy, sorry for my english

I've to determinate a math equation to describe the real instantaneus torque aboute a v12 diesel engine

I've this input, the nominal torque 400 Nm at 1400 rpm, ?irregular degree?=0.05

like this figure

[PLAIN]http://www.epi-eng.com/images/Engine/ET-X-V12.gif

thanks to all

Francesco
 
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Tricky one.

I would model this by using cylinder pressure curves to calculate instantenous force on the connecting rod, and geometrically convert this into a torque. Overlay this for each cylinder. That gives you the firing input. You might then want to make some assumptions about torsional vibration if you have information about crankshaft stiffnesses and rotating inertias.
 
Hi dot_francesco,

I think I could help if you give me more data. We need to give me the following parameters: compression ratio [-], nominal power[kW] and the speed power[rot/min].
 
this is a pubblic data sheet take from marine.cummins.com

the V angle is 60°

thanks to all!
 

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