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Attempting a MPRS analysis... I would like to apply force loads for spectrum analysis. They are derived from dfft of time-based data. The dfft data is a complex number, so I have magnitude and phase. Now I would like to apply this frequency-based load data to a structural model. Is it...

Yes I read your post, but I don't think you read mine :) I have bearing forces to apply to the mounting structure vs. time. I have been thinking to model the change in direction of the load with time as it rotates by having it act radially on successive nodes on the bearing bore diameter each...

I found Section 3.14 - How to solve multiple load steps, yeh! Sorry to bug ya all people :) But I am interested to know if anyone can suggest a more efficient way, especially when you have a LARGE number of load steps? Maybe by re-write the same load step file? Or if anyone has worked on a...

Would it be something like this, after first defining the time and force arrays? N = <# of load step data points> *do,n,1,N F,13,FY,%force(n)% TIME = %time(n)% LSWRITE,n *enddo Sorry for the additional posts! thanks, -steve

I guess my question is, do you have to write a macro or a command script to write a separate load step file for every time step? (that references the tabular data) Or are there commands to have Ansys read in a table that includes t & F and run a load step for each one?? I looked all around in...

Ok, I looked through all the past posts, only thing I found was one about using 'frictionless condition' and axial constraint for modeling the shaft. I have radial loads from bearing prediction code. If I have say 20 points distributed on a circle, I thought I could specify the radial force...

Did you get a response about this situation? I have a similar problem with an applied load-time history data that will generate initial transients, but I'd like to see the stabiized response! Anyone else know about this??? thanks, -steve

Problem Background: ------------------- 1.Simulation of stress in a structure due to applied loads from unbalanced rotor-bearing system. 2.Have force data (vs. time) to apply to the structure at 2 bearing locations. 3.Structure is 100,000 elem 3D solid tet mesh 92. 4.Ignoring interaction...