Structural Health Monitoring

[jericho69]

Hi Guys,
Basically i'm got some engine sound data in MATLAB form that needs analysis and diagnostics.I was able to source out a couple of methods of plotting the data.This was done via FFT,power spectrogram and a probability density plot.
But here's the problem,i dont know any techniques for extracting features from these analysis results.Because i need to use these features rather than the analysis results (shown in my diagrams) for fault detection and diagnosis.

I'd deeply appreciate it if anyone can push me in the right direction.

 

[AX3L]

I'm not quite sure what you mean by features, but in case you write "fft(x)" to get the plot writing "Y = fft(x)" will save the fft of x in Y in the same format as x, usually a vector. Then you can easily compare the results with some of all features for vectors in matlab (element by element, compare highest values and so on).

 

[GregLocock]

You probably want to run some sort of peak detection algorithm, in which case find and max are two helpful commands,

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?