matlab Pwelch-Need Urgent help-units

Discussion in 'Programmer's Corner' started by 19dan87, May 3, 2011.

  1. 19dan87

    Thread Starter New Member

    Apr 12, 2011
    5
    0
    Hi,
    I am simulating vibrations in simulink and processing my results in matlab. I am trying plot the PSD for my acceleration results using pwlech method.
    When I plot the PSD plots from the methods below
    (NOTE:I have a sampling rate of 0.006 so that means I am using a sample frequency of Fs=1/0.006=166)
    Pwelch(x,[],[],2024,fs)
    Or [Pxx,f]=pwelch(x,[],[],2024,fs) plot(f,Pxx)
    The results on the Y axis are in the form of dB/Hz. How do I changed the plot/results so that I can plot PSD acceleration, ie. ms^-2 back . I want to show the plots in the form of the units used in the simulations.

    Thanks
    Dan
     
  2. 19dan87

    Thread Starter New Member

    Apr 12, 2011
    5
    0
    also I it would be best if I could show the results of the PSD plots as a smooth line by putting some kind of line of best git through the pwelch values obtained.

    Any advice on the above 2 questions will be much appreciated since I have to find a way of doing this in to show my results by the end of today.

    Thanks

    Dan
     
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