A short correction. An FRF is actually a slice through a transfer function, which is a complex plane, where the slice is along the jw=0 axis. FRF's are "commonly" referred to output/input relationships and therefore anything can go in the numerator and denominator. Experimentally there are a a...
LMS's Virtual.Lab software has a module called Noise and Vibration. It is designed to do system level vibration simulation using assemblies of FE models, Modal models or FRF based models. When components or sub-assemblies are based on FE you can use a number of different solvers (NASTRAN, ANSYS...
LMS has a module for Sysnoise called Random Vibro Acoustics. If you have an acoustic pressure power spectrum you can determine surface vibrations through a boundary element technique. It requires you to have a model of the system you are testing. You can think of this in simple terms of knowing...
