Hello, I am trying to model the behaviour of a reactor vessel when some particles inside the container strike the inner wall using FINITE ELEMENT MODELLING software. I reproduced several random particles hitting the wall at different times and position across the surface of the inside wall. Now I would like to get rid of the TRANSFER FUNCTION of the container from the random particles data using the deconvolution to extract only the particle informations. I apply an inpulse inside the vessel (the middle) and I acquire the output on the outer surface. THe PROBLEM: How can I deconvolve the spectra in a right way? In fact the TRANSFER FUNCTION of the vessel changes according with the position of the impact. The tranfer function of the vessel will be completely different when considering the position A or position B. | | posB> | | | | posA> | |> output | | | | Can somebody help me please? What kind of DSP tool should I use? it is really important for me to solve this problem. Thanks a lot M

# A difficult deconvolution...

Started by ●June 30, 2005

Reply by ●July 1, 20052005-07-01

Reply by ●July 1, 20052005-07-01

Deconvolution and Transfer Function are terms from signal processing. A signal is (usually) a time series with equal time spacing between each sample, which we write as x[n], for n=0,1,2, .... What exactly are your x[n]? Regards, Andor

Reply by ●July 1, 20052005-07-01

Andor, thanks for getting back to me. x[n]= acoustic signal originated by the particle impact. y[n]=acoustic signal output (after the vessel wall h[n]=Transfer function of my vessel. So, y[n]=h[n]*x[n] I want to find x knowing y. The problem is that h is not the same everytime! It varies with the position of the particle impact (the output position is always the same in the middle of the external wall). How can I estimate h? Thanks Manuel

Reply by ●July 1, 20052005-07-01

tramoman wrote:> Andor, > thanks for getting back to me. > > > > x[n]= acoustic signal originated by the particle impact. > y[n]=acoustic signal output (after the vessel wall > h[n]=Transfer function of my vessel. > > So, y[n]=h[n]*x[n] > I want to find x knowing y. The problem is that h is not the same > everytime! > It varies with the position of the particle impact (the output position > is always the same in the middle of the external wall). > How can I estimate h? Thanks > ManuelYou obviously can't do it with a single measurement of y[n]. With two or more sensors, you might be able to locate the point of y[n]'s origin and so know something about h[n] there. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������