H1 FRF Estimator Derivation 2

[271828]

I'm looking for a good derivation of the H1 FRF estimator. I have several modal books, but I haven't been able to really understand it from looking at them. They kinda glossed over it and just showed the equation. Haven't found a good one online either, but I have no doubt it's there somewhere. Does anybody know of a good (preferably online) source of a derivation?

 

[GregLocock]

Have you got the B&K book? I'm pretty sure that goes into it.

The idea is simple enough - which of your two spectra is likely to be noisiest in the area of interest?


Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[271828]

Thanks Greg. What book, exactly, would that be? I don't have it.

 

[GregLocock]

Either "Frequncy Analysis" or the advanced modal one. Or look for a paper by Harvard Volt from SDRC on the HV estimator, which gives a potted history of estimators.

I think the LMS modal reference books also discuss choice of estimator.

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[cincibcats]

You should also be able to find it at the University of Cincinnati Sructural Dynamics Research Lab's (SDRL) website. If you go to

http://www.sdrl.uc.edu

and go to the academic course info section there should be course notes for all courses. It derives H1, H2, and Hv.

 

[GregLocock]

Oh, and if your data is 'lab quality' then don't expect miracles.

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.