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  1. I am attempting to run a simulation that consists of the following: a heat exchanger mounted to a vibration test fixture, which is mounted by bolts to a flat vibration test stand. I applied fixed geometry to the bolt holes, and a mass load to where the heat exchanger is to be mounted. When I run the simulation, I get low resonant frequencies. I believe this is because the areas with the tower pieces are displacing a large amount. I would think that adding a roller would model the effects of the flat test stand which the fixture is mounted to, as it would be preventing the fixture
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