torque calculation

mach000 · April 12, 2010, 08:07

Hi to everybody,
I need to calculate the torque on the object I'm studying.

I usually use this expression:

torque_z()@object (1)

in order to calculate the z component of the torque.
In this case the software will automatically calculate this torque considering the origin global axis point as reference point.

In my case I need to calculate this torque considering not the origin of the global axis but the "moving" origin of a new local axis system.

Do someone know how I can modify the expression (1) in order to solve my problem?

Thanks in advance

Ciro

ghorrocks · April 12, 2010, 19:35

A bit of basic mechanics can do it. Draw some vector diagrams and work it out.

mach000 · April 14, 2010, 05:00

Hi ghorrocks,
thank you for your reply but I think I was not able to explain my problem well.
I needed to write an expression in CFX pre in order to calculate the torque respect a a moving centroid of the planing hull I'm studying.
In the meanwhile I think I've solved my problem...now I have only to test it!
Thank you again!

April 12, 2010, 08:07	torque calculation	#1
mach000 Member Ciro Cannavacciuolo Join Date: Mar 2009 Posts: 35 Rep Power: 17	Hi to everybody, I need to calculate the torque on the object I'm studying. I usually use this expression: torque_z()@object (1) in order to calculate the z component of the torque. In this case the software will automatically calculate this torque considering the origin global axis point as reference point. In my case I need to calculate this torque considering not the origin of the global axis but the "moving" origin of a new local axis system. Do someone know how I can modify the expression (1) in order to solve my problem? Thanks in advance Ciro

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April 12, 2010, 19:35		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	A bit of basic mechanics can do it. Draw some vector diagrams and work it out.

April 14, 2010, 05:00		#3
mach000 Member Ciro Cannavacciuolo Join Date: Mar 2009 Posts: 35 Rep Power: 17	Hi ghorrocks, thank you for your reply but I think I was not able to explain my problem well. I needed to write an expression in CFX pre in order to calculate the torque respect a a moving centroid of the planing hull I'm studying. In the meanwhile I think I've solved my problem...now I have only to test it! Thank you again!