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Random vibration for a structural shell -contact problem
Posted 7 Mar 2020, 03:16 GMT-5 Acoustics & Vibrations Version 5.5 2 Replies
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I would like some advice on how to approach a random vibration issue related to the ROM (reduced order model) calculation process. I am following the example with the bracket model for random vibrations as a guiding step and I apply it to my model which has shell type physics. Concisely the steps followed, six new nodes, new values for forces, points set for measurement in Def\Variables, calculate the ROM for pre-stress Eigen (contact type prorblem), Global\ Set interpolation-piecewise, assign parameters to rand vibration node. and finally I update the solution for ROM. When I go to results to get from a global evaluation sweep the PSD of the response at a point (specified at variables) it gives a message that there is no such expression (rvib1.psd). I took it a step further by loading the model in Matlab and running the study there. Where with eval I ask it to provide data related to response for all axes. The matrices return empty. The information I find for what to consider related to the ROM solving process are limited so a direction where to look for or some advice will be appreciated.
Thank you, Theodore