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It is very helpful to me. Thanks!

I have been doing some research on non-stationary vibration analysis.STFT is one of useful time-frequency analysis tools to get the information of rotordynamic during run-up and coast down.

Thanks again for your replies! Dear GregLocock Do you means I can sent the run-up sampling data to you for a help? The data file not very big about 1.2Mb.If you like, I can do it and send you some plots of my analysis result at the same time.But tell me how I send the data to you. Thanks! Your...

First, I thank DePauw and Greg Locock for your good suggestion.My sampling rate was set to 50KHz in test. It is a very heavily oversampleing to the original data,but is useful for synchronously sample in later.And I do a downsampling before the STFT analysis for a good frequency resolution. The...

Thanks for your reply.Yes, your suggest is good. But, in my research I can get the instantaneous speed of shaft by some time-frequency analysis algorithm,such as STFT etc. if the non-stationary vibration data is good (I did some analysis to run up/run down vibration data provided by others, but...

Hello everyone! I am a student, and do some research on time-frequency analysis of vibration.So, the speed-depend vibration data during run up of machines is important to me.Recently, I did a vibration test about run up of machinetools.What I wanted to attain was the sampling data of...

hello I am a student,and now study on faults diagnosis of rotating machinery which employed time-frequency analysis. Some works were done,and the result showed it's more effective for time-frequency analysis to non-stationary vibration signal. But at other hand, I am lack of experience on...