How to determinate instantaneus torque

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In summary, the conversation is about determining a math equation for calculating the instantaneous torque of a V12 diesel engine. The input is the nominal torque of 400 Nm at 1400 rpm and an irregular degree of 0.05. The suggested approach is to use cylinder pressure curves to calculate force on the connecting rod and convert it into torque for each cylinder. More data is needed, such as compression ratio, nominal power, and speed power, to accurately model this. The V angle is mentioned to be 60°.
  • #1
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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  • #2
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.
 
  • #3
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].
 
  • #4
this is a pubblic data sheet take from marine.cummins.com

the V angle is 60°

thanks to all!
 

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FAQ: How to determinate instantaneus torque

What is instantaneous torque and how is it different from average torque?

Instantaneous torque refers to the amount of rotational force or moment a body experiences at a specific moment in time. It is constantly changing as the body rotates. Average torque, on the other hand, is the average value of torque over a period of time. It is calculated by dividing the total torque by the time taken. Instantaneous torque gives a more precise understanding of how a body is rotating compared to average torque.

How is instantaneous torque measured?

Instantaneous torque is measured using a torque sensor or a torque meter. These devices are typically placed between the rotating body and the point where the force is applied. They measure the amount of force and the distance from the point of rotation, and use this information to calculate instantaneous torque.

What factors affect the magnitude of instantaneous torque?

The magnitude of instantaneous torque is affected by several factors, including the distance from the point of rotation, the force applied, and the angle at which the force is applied. The moment of inertia, which is a measure of the body's resistance to rotation, also plays a role in determining the magnitude of instantaneous torque.

How do you determine the direction of instantaneous torque?

The direction of instantaneous torque is determined by the right-hand rule. If you point your right thumb in the direction of the force applied and your fingers in the direction of rotation, the direction in which your palm is facing indicates the direction of the instantaneous torque.

What is the importance of understanding instantaneous torque in scientific research?

Instantaneous torque is a crucial concept in the study of rotational motion and is used in various fields such as engineering, physics, and biomechanics. It helps in the design and analysis of machines, understanding the movement of celestial bodies, and even in studying the movement of living organisms. Understanding instantaneous torque is essential for gaining a deeper understanding of the physical world and making accurate predictions and calculations.

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