58 lines
1.4 KiB
Mathematica
58 lines
1.4 KiB
Mathematica
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% Matlab Init :noexport:ignore:
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current_dir='/home/thomas/MEGA/These/meas/slip-ring-test/';
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%% Go to current Directory
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cd(current_dir);
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%% Initialize ans with org-babel
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ans = 0;
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%% Clear Workspace and Close figures
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clear; close all; clc;
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%% Intialize Laplace variable
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s = zpk('s');
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% Load data
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% We load the data of the z axis of two geophones.
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d8 = load('mat/data_018.mat', 'data'); d8 = d8.data;
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d9 = load('mat/data_019.mat', 'data'); d9 = d9.data;
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% Analysis - Time Domain
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% First, we compare the time domain signals for the two experiments (figure [[fig:slipring_time]]).
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figure;
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hold on;
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plot(d9(:, 3), d9(:, 2), 'DisplayName', 'Slip-Ring');
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plot(d8(:, 3), d8(:, 2), 'DisplayName', 'Wire');
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hold off;
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xlabel('Time [s]'); ylabel('Voltage [V]');
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xlim([0, 50]);
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legend('location', 'northeast');
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% Analysis - Frequency Domain
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% We then compute the Power Spectral Density of the two signals and we compare them (figure [[fig:slipring_asd]]).
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dt = d8(2, 3) - d8(1, 3);
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Fs = 1/dt;
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win = hanning(ceil(1*Fs));
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[pxx8, f] = pwelch(d8(:, 2), win, [], [], Fs);
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[pxx9, ~] = pwelch(d9(:, 2), win, [], [], Fs);
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figure;
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hold on;
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plot(f, sqrt(pxx9), 'DisplayName', 'Slip-Ring');
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plot(f, sqrt(pxx8), 'DisplayName', 'Wire');
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hold off;
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set(gca, 'xscale', 'log');
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set(gca, 'yscale', 'log');
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xlabel('Frequency [Hz]'); ylabel('Amplitude Spectral Density $\left[\frac{V}{\sqrt{Hz}}\right]$')
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xlim([1, 500]);
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legend('Location', 'southwest');
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