FRF CPS plot in Matlab
FRF CPS plot in Matlab
(OP)
Hallo!
I plot the FRF in Matlab with the command:
plot(f_vec,20*log10(sum(abs(frf_mat)./(size(frf_mat,1)))),'b','LineWidth',1.5);
-f_vec is the Frequency in Hz
-frf_mat ist the frf matrix
The data is imported from a universal file and measured with the LMS Cada-X Software. My Question: I have also measured the Cross Power Spectrum and want to plot it in MatLAb like the FRF. The x axis with the frequency (f_vec) is correct, but the y axis is not correct displayed, the dB value is moren than the double as it should. I only want to plot the CPS and not compute, the data is already measured.
Thanks from Germany
I plot the FRF in Matlab with the command:
plot(f_vec,20*log10(sum(abs(frf_mat)./(size(frf_mat,1)))),'b','LineWidth',1.5);
-f_vec is the Frequency in Hz
-frf_mat ist the frf matrix
The data is imported from a universal file and measured with the LMS Cada-X Software. My Question: I have also measured the Cross Power Spectrum and want to plot it in MatLAb like the FRF. The x axis with the frequency (f_vec) is correct, but the y axis is not correct displayed, the dB value is moren than the double as it should. I only want to plot the CPS and not compute, the data is already measured.
Thanks from Germany





RE: FRF CPS plot in Matlab
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: FRF CPS plot in Matlab
RE: FRF CPS plot in Matlab
Greetz
RE: FRF CPS plot in Matlab
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: FRF CPS plot in Matlab
- Steve
RE: FRF CPS plot in Matlab
RE: FRF CPS plot in Matlab
- Steve
RE: FRF CPS plot in Matlab
Greetings
RE: FRF CPS plot in Matlab
You really have to create a sine wave that has exact known attributes and put it through the system. Otherwise you'll always be wondering. I have wasted hours and hours before realising and doing this.
</soapbox>
- Steve