Steady state forced response using modal superposition technique

Altair Forum User

Hi,

 

I have done the modal analysis of a simply supported plate. Now I need to find the forced response of the SS plate for a point forcing. The transverse (perpendicular to the plate) point load is harmonic (say F cos(wt) ,where F is magnitude and w is frequency in rad/s). I need a steady state response. i.e displacement field at a given time instant. 

 

Is it possible to use the mode set from the modal analysis and get the solution as a modal superposition of those modeshapes ? If yes please help me out with the steps roughly.

 

regards,

Vachan 

 

 

Rahul Rajan_21763

I think this is possible with  transient response analysis.You would find OptiStruct online tutorials for frequency and transient response analysis which covers step by step process.

Also you can download free eBook on OptiStruct Dynamic Analysis using below link.(Chapter 14 Example 5 covers usage of TLOAD2 card which helps to define frequency,phase shift and time)

https://altairuniversity.com/free-ebook-learn-dynamic-analysis-with-altair-optistruct/