HalfPower Bandwidth method

[vibract]

Hello members,
I am working on shell emitted noise and I am required to optimise the noise considering damping (modal).
As a part of that, I need to determine damping ratios experimentally. The simulated first natural frequency of the structure is of 300Hz. Now, I need to know which experimental method is best suitable for finding damping ratio. I read Experimental decay method and HalfPowerBand Width method suits well for this purpose. I gathered some info on the test rigs used for finding Frequency response function (FRF). For this, speaker is used as the exciting device. FRF is determined as the ratio of Velocity over the point on the surface to the Sound Pressure Level at the same point but just below the inner surface of the structure. i.e FRF=Vel/SPL. Using this FRF, damping ratio is found using Half Power Band width method.
Friends, I am in need of much information about this test rig/method. If there is any other method of determing damping ratio, kindly let me know. Your help in this regard is highly appreciatable.
Regards

 

[IADSJohn]

If you are lucky enough to have access to IADS software, tools for pretty much all of the methods described here are built in and user friendly. I know we're not supposed to self-promote here, but I think I'm mostly offering solid technical advice. The LogDec (and other similar), HPD for PSD/Autospectrum and FRF, CE and RFP Curve fits (for MDOF) are all in there, and learning-curve time is short.