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(root)
/
VibrationTest
/
branches
/
v1.0
/
Misc
/
Matlab
/
VibTestSpec.m
@ 1408
- Rev 682
Rev
Rev 588
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function
VibTestSpec
(
file
)
% Read logfile
log
=csvread
(
file
)
;
fs=
11111
;
% Sample freq
for
col=
1
:
10
% Take one of the measurements
inSignal=
log
(
:,col
)
';
inSignal = inSignal -
mean
(
inSignal
)
;
n=
length
(
inSignal
)
;
% Take FFT
FFT
=
fft
(
inSignal
)
;
%spec = FFT.*conj(FFT)/n
spec =
abs
(
FFT
)
/n;
spec = spec
(
1
:n/
2
)
;
specs
(
:,col
)
= spec;
end
f =
int32
(
fs/n*
(
0
:n/
2
-
1
)
)
;
% Freq
plot
(
f,specs
)
;
title
(
'Spectrum'
)
;
xlabel
(
'Hz'
)
;
axis
(
[
1
400
0
15
]
)