September 17, 2018 at 12:08 pmVanderbeziSubscriber
my aim is to model a 3-cylinder engine crankshaft with variable piston loads and with an initial rotational velocity of 5000 rpm.
As i am new to Ansys, i am not sure which type of analysis to use. I thought the transient structural analysis to be right, but for some reason within the "initial conditions" the rotational velocity is grayed out and i cannot use it.
should i change the analysis type? or am i doing something wrong with the rotational velocity?
September 17, 2018 at 1:54 pmSandeep MedikondaAnsys Employee
According to the manual, you should be able to define Initial conditions in a Transient Structural Analysis. Please see this:
I checked this in 19.1, what version are you using?
September 17, 2018 at 2:05 pm
September 17, 2018 at 2:12 pmSandeep MedikondaAnsys Employee
Ahh, I see. I don't think this is possible from the GUI, but let me check if we can do this through a command object.
September 17, 2018 at 2:44 pmSandeep MedikondaAnsys Employee
This can be done using the command snippet using the "icrotate" command snippet.
! Commands inserted into this file will be executed just prior to the ANSYS SOLVE command.
! These commands may supersede command settings set by Workbench.
! Active UNIT system in Workbench when this object was created: Metric (mm, t, N, s, mV, mA)
! NOTE: Any data that requires units (such as mass) is assumed to be in the consistent solver unit system.
! See Solving Units in the help system for more information.
!arg1 - omega
!ar2-4 - (x,y,z) of the initial point of the vector in csys,0
!arg5-7 - (x,y,z) of the final point of the vector in csys,0
I tested this on a simple model and was able to successfully run this. I think this should be available from the GUI itself and will file an enhancement request on this. Thanks for bringing it to our attention.
P.S: If a post answers your original question, please mark it as a solution (‘As Solution&rsquo so that it might help someone in the future. This will help reduce repetitive questions and help provide better support on this Forum.
September 17, 2018 at 3:34 pmVanderbeziSubscriber
thank you for your quick answer.
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