MATLAB: Calculate the frequency response of acceleration data

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marcusbarnet
marcusbarnet 2018-1-10
hi to all,
I have a vector in Matlab which contains samples acquired at 10Hz from an accelerometer mounted on a frame's vehicle. This vector contains the acceleration values along the Z-axis. The acquisition time is 103 seconds.
I would like to plot the frequency values in Hz since I'm trying to study the terrain frequency response.
I tried to use the fft function available in Matlab, but I do not know how to proceed. Can you help me, please?
These are the values contained in my vector:
size(vibration)
ans =
1024 1
vibration =
-0.0005
-0.0006
-0.0007
-0.0008
-0.0010
-0.0011
-0.0012
-0.0013
-0.0014
-0.0015
-0.0016
-0.0017
-0.0018
-0.0019
-0.0020
-0.0021
-0.0022
-0.0023
-0.0024
-0.0026
-0.0027
-0.0025
-0.0003
-0.0038
-0.0089
-0.0035
-0.0018
-0.0022
0.0004
0.0034
0.0063
-0.0023
-0.0046
-0.0022
-0.0043
0.0041
0.0025
0.0024
0.0037
0.0050
0.0060
0.0012
0.0058
0.0019
0.0008
0.0009
-0.0060
0.0004
0.0032
-0.0005
-0.0008
-0.0024
0.0021
0.0009
-0.0019
0.0003
0.0012
0.0069
0.0125
0.0209
0.0262
0.0184
0.0100
0.0058
0.0136
0.0181
0.0089
0.0058
0.0077
0.0045
0.0024
0.0015
0.0044
0.0095
0.0096
0.0087
0.0019
0.0053
0.0066
0.0033
-0.0010
0.0010
0.0116
0.0059
0.0109
0.0151
0.0130
0.0152
0.0095
0.0127
0.0178
0.0180
0.0220
0.0234
0.0253
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0.0263
0.0214
0.0119
0.0093
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0.0151
0.0192
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0.0212
0.0223
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0.0144
0.0203
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0.0147
0.0100
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0.0197
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0.0144
0.0111
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0.0081
0.0040
0.0021
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0.0095
0.0098
0.0111
0.0102
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0.0142
0.0146
0.0121
0.0107
0.0090
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0.0126
0.0155
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0.0114
0.0100
0.0045
0.0046
0.0052
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-0.0033
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0.0116
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0.0089
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