Hi,
I'm trying to determine the source of a vibration signal by the use of 2 accelerometers, a dual channel spectrum analyzer and the cross-correlation function. The length of the time signal is 10s and my frequency range is 5000 Hz.
As the Cross correlation function is a measure of the similarity in two time domain signals, I am expecting a result close to 1 if the signals are identical and if they are completely dissimilar, the cross correlation will be zero.
My first step was to verify this method. I put the 2 accelerometers close to one source (motor) and the results with the cross-correlation function was, roughly, a line starting starting from 0.02 to 0.
Did I miss something or is my asumption wrong?
On the other hand, the coherence (frequency domain) has the results that I expected: value of 1 except at the resonant frequencies on the tested piece of equipment (motor).
I tried different configuration and set-up but I still have the same results with the cross-correlation...
Thanks for your help,
Laurent.
I'm trying to determine the source of a vibration signal by the use of 2 accelerometers, a dual channel spectrum analyzer and the cross-correlation function. The length of the time signal is 10s and my frequency range is 5000 Hz.
As the Cross correlation function is a measure of the similarity in two time domain signals, I am expecting a result close to 1 if the signals are identical and if they are completely dissimilar, the cross correlation will be zero.
My first step was to verify this method. I put the 2 accelerometers close to one source (motor) and the results with the cross-correlation function was, roughly, a line starting starting from 0.02 to 0.
Did I miss something or is my asumption wrong?
On the other hand, the coherence (frequency domain) has the results that I expected: value of 1 except at the resonant frequencies on the tested piece of equipment (motor).
I tried different configuration and set-up but I still have the same results with the cross-correlation...
Thanks for your help,
Laurent.