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Description: 我要進行模態分析，但我該如何確認我的接觸條件是合理的，亦或是我該將模型視為理想的，將所有接觸條件設定為Tie。
Product/Topic Name : optistruct 2022.2
Modal analysis is linear so you cannot have nonlinear contact. Some assumption has to be made. You can assume the contact gap is close (similar as tie contact) or open (no contact in effect). In many cases, there is no perfect way to mimic the real contact situation. You probably can see the best scenario and the worst scenario results.
If you have any preload or pretension, you can run nonlinear static solution and then modal analysis on top of it. The modal analysis can use the contact status determined by the nonlinear static solution.
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