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Hi mburlone, I have received a solution to modelize preload springs ! You can define a CSPR element (Spring with Offsets). It use a PSPRMAT property and Material MATS01, and supports preload. Small limitation is that the OFFSET option is not supported by PATRAN so you have to change it in the...

Hi vomi1 To give you an exact answer, we need to know the solver you will use. And also if it is initial rotational acceleration, or if the acceleration acts during all the calculation. For the units it should be: rotational acceleration : [Patran Angular Unit]/([TIME Unit]*[TIME Unit])...

Hi mburlone, Thank you for this tip. I think that there is no way to define CBUSH1D with Patran, you have to do the modifications directly in your *.bdf file. The only problem in my case is that I am not sure that the CBUSH1D element is available for NASTRAN sol700, due to translation to...

I need to modelize a system that inclued several springs in a preload position. Objective is to run a dynamic analysis with NASTRAN sol700. I planned to use a bar element with a spring material property, but I don't know how to define the preload status. Thank you in advance for any tips.