![]() The period of one vibration would be 1/700 or. Let’s say you discover the lowest mode for an assembly is 700Hz. What you are looking for is the lowest natural response frequency of the structure. Use as many of the boundary conditions as you can from the final, non-linear impact study. Determine Your Solution Timeīefore running the non-linear, time-dependent study, you can run a simple, Linear case to help frame the problem. In this tech tip, you’ll learn how to set the manual time step, and how long the analysis should run in ‘real’ time. For this type of problem, you should NOT use the Auto Time-Stepper. But what if you also need to account for non-linear material? What if your load case is not a simple drop, but a specified impact time-curve? Then you will need to run this as a Non-Linear, Time-Dependent case. There is, of course, a Study Type that is available with a Simulation Professional license, called “Drop Test”, and this automates all the internal options for setting up the problem. But when you do impact studies, then you must also take care about how you discretize Time, as well as Space. For Linear, Static stress analysis, we frequently say that the art of FEA is the art of the mesh.
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