Hello everyone,
I need a small information from your side. As i am performing modal analysis for my structure. My geometry is very simple made up of granite material. I would like to describe my problem in points, that would be easy to unterstand,
1. Firstly, i did the static analysis of my structure, where the outcome was acceptable. I mean to say the deformation (0.00155mm) and the stress (1.004Mpa) were under the limit.
2. Then i performed the modal analysis of my structure with same constraint and load collector, where i have selected 6 eigen mode. After the analysis I got the E1 (507.741Hz) to E6 (1358.87Hz) value.
3. Can someone explain me how to read the modal analysis results, because at each eigen value the results getting changed. Also, should I consider the deformation and the stress value from the modal analysis? Because compare to the static analysis their values are very high.
I would appreciate if anyone have a look on this concern. Thanks
SFM
Solved! Go to Solution.
It sounds like you may want to brush up on FEA basics. There are lots of training packages out there, some offered directly by PTC.
That being said, static analysis is meant for something that does not have dynamic loads. IE you put an object on a table and you want to see how much stress the table sees.
Modal analyses are for dynamics. IE you want a tuning fork to resonate at a particular frequency or you are designing a building and you want it to not have the first same frequency as an earth quake. Modal analyses tell you how flexible/stiff something is.
Dynamic analyses use modal analyses to determine stresses for an input range of frequencies. IE you have a rocket going up to space and you want to know what the vibration loads are going to do to your product.
It sounds like you may want to brush up on FEA basics. There are lots of training packages out there, some offered directly by PTC.
That being said, static analysis is meant for something that does not have dynamic loads. IE you put an object on a table and you want to see how much stress the table sees.
Modal analyses are for dynamics. IE you want a tuning fork to resonate at a particular frequency or you are designing a building and you want it to not have the first same frequency as an earth quake. Modal analyses tell you how flexible/stiff something is.
Dynamic analyses use modal analyses to determine stresses for an input range of frequencies. IE you have a rocket going up to space and you want to know what the vibration loads are going to do to your product.