Time synchronous averaging basics in Signal Express

[dorito2025]

Hello, 

I have used the signal express interface along with the sound and vibration toolkit to post process vibe data before. I want to be able to post process my shaft vibe data using Time Synchronous Averaging techniques. I have a 1/rev signal tachometer that I can use for segmentation. How do I go about TSA my vibe data within signal express? 

Is this even the right approach? Should the TSA be done as a post processing step or should it be performed prior to recording data?

Thanks for the help

[dsb@NI]

Sorry I didn't see your post sooner.

In SignalExpress/Sound and Vibration Assistant, the closest analog to TSA is to use vector-averaged order power spectrum. Just like TSA, any signal components that are uncorrelated with the running speed will be 'averaged away'. 

I recommend that you continue using post-processing techniques to perform vibration analysis. Post processing allows you to try different analysis techniques (maybe analyzing 10 cycles instead of 1 if you have subharmonics). If you perform filtering, decimation, averaging, etc. before recording the signal, you lose the original acquired data.

P.S. Signal Express and Sound and Vibration Assistant are no longer supported. Consider migrating your project to LabVIEW where you can take advantage of more robust and flexible measurement analyses.