I take FRF data on a car body at suspension and engine attachment locations. We measure a transfer function from the attachment to driver's ear, etc.
Currently, we do each measurement twice - once with a larger modal hammer to get low frequency transfer function, and once with a smaller hammer to get the high frequency transfer function. It is really not possible to use a single hammer to get the entire frequency range of interest.
Is it possible to combine the two FRFs taken at each attachment into a single FRF that spans the entire range?
Solved! Go to Solution.
The program "FRF Merge" is in the Tools menu. LMS Test.Lab should already be running, and have a project open with both sets of FRFs.
Once the interface is open, use the "Folder with LF data" to select the section or run with the low frequency FRF data. Use "Folder with HF data" to select the high frequency FRF data. The FRF data should have the same names.
The transition band settings allow you to decide what frequency content of the FRFs to keep. The data can be blended together over the transition zone.