Multi point response spectrum

[mohamed hassan 2014]

How are you?
in ansys apdl What is the difference between single point response spectrum and Multi point response spectrum ?, and how can i apply multi point response spectrum on the model?.

 

[Rahul Leslie]

The same thing I’m also interested in knowing about. All I know is that for a set of PSD curves to be applied on a structure, you have to process and determine another set of Cross-PSD, derived for all combinations of PSD’s, like C-PSD(i,j) derived from PSD(i) and PSD(j) (and obviously not for cases of i=j). And for multi-point PSD analysis, all these PSD’s and C-PSD’s are to be input. These I happened to read bits and pieces from here and there, but the actual procedure, or the tools that can be used to get these, are unknown to me. Somebody please elaborate (and correct me if I'm wrong)