108 lines
2.9 KiB
Matlab
108 lines
2.9 KiB
Matlab
%% Clear Workspace and Close figures
|
|
clear; close all; clc;
|
|
|
|
%% Intialize Laplace variable
|
|
s = zpk('s');
|
|
|
|
% Load data
|
|
|
|
of = load('mat/data_024.mat', 'data'); of = of.data;
|
|
sr = load('mat/data_025.mat', 'data'); sr = sr.data;
|
|
sp = load('mat/data_026.mat', 'data'); sp = sp.data;
|
|
|
|
% Time domain plots
|
|
|
|
figure;
|
|
hold on;
|
|
plot(sp(:, 3), sp(:, 1), 'DisplayName', 'Spindle - 6rpm');
|
|
plot(sr(:, 3), sr(:, 1), 'DisplayName', 'Slip-Ring - 6rpm');
|
|
plot(of(:, 3), of(:, 1), 'DisplayName', 'OFF');
|
|
hold off;
|
|
xlabel('Time [s]'); ylabel('Voltage [V]');
|
|
xlim([0, 100]); ylim([-10 10]);
|
|
legend('Location', 'northeast');
|
|
|
|
|
|
|
|
% #+NAME: fig:slip_ring_spindle_marble_time
|
|
% #+CAPTION: Measurement of the geophone located on the marble - Time domain
|
|
% #+RESULTS: fig:slip_ring_spindle_marble_time
|
|
% [[file:figs/slip_ring_spindle_marble_time.png]]
|
|
|
|
|
|
figure;
|
|
hold on;
|
|
plot(sp(:, 3), sp(:, 2), 'DisplayName', 'Spindle and Slip-Ring');
|
|
plot(sr(:, 3), sr(:, 2), 'DisplayName', 'Only Slip-Ring');
|
|
plot(of(:, 3), of(:, 2), 'DisplayName', 'OFF');
|
|
hold off;
|
|
xlabel('Time [s]'); ylabel('Voltage [V]');
|
|
xlim([0, 100]); ylim([-10 10]);
|
|
legend('Location', 'northeast');
|
|
|
|
% Frequency Domain
|
|
% We first compute some parameters that will be used for the PSD computation.
|
|
|
|
dt = of(2, 3)-of(1, 3);
|
|
|
|
Fs = 1/dt; % [Hz]
|
|
|
|
win = hanning(ceil(10*Fs));
|
|
|
|
|
|
|
|
% Then we compute the Power Spectral Density using =pwelch= function.
|
|
|
|
% First for the geophone located on the marble
|
|
|
|
[pxof_m, f] = pwelch(of(:, 1), win, [], [], Fs);
|
|
[pxsr_m, ~] = pwelch(sr(:, 1), win, [], [], Fs);
|
|
[pxsp_m, ~] = pwelch(sp(:, 1), win, [], [], Fs);
|
|
|
|
|
|
|
|
% And for the geophone located at the sample position.
|
|
|
|
[pxof_s, f] = pwelch(of(:, 2), win, [], [], Fs);
|
|
[pxsr_s, ~] = pwelch(sr(:, 2), win, [], [], Fs);
|
|
[pxsp_s, ~] = pwelch(sp(:, 2), win, [], [], Fs);
|
|
|
|
|
|
|
|
% And we plot the ASD of the measured signals:
|
|
% - figure [[fig:sr_sp_psd_marble_compare]] for the geophone located on the marble
|
|
% - figure [[fig:sr_sp_psd_sample_compare]] for the geophone at the sample position
|
|
|
|
|
|
figure;
|
|
hold on;
|
|
plot(f, sqrt(pxsp_m), 'DisplayName', 'Spindle - 6rpm');
|
|
plot(f, sqrt(pxsr_m), 'DisplayName', 'Slip-Ring - 6rpm');
|
|
plot(f, sqrt(pxof_m), 'DisplayName', 'OFF');
|
|
hold off;
|
|
set(gca, 'xscale', 'log');
|
|
set(gca, 'yscale', 'log');
|
|
xlabel('Frequency [Hz]'); ylabel('ASD of the measured Voltage $\left[\frac{V}{\sqrt{Hz}}\right]$')
|
|
legend('Location', 'southwest');
|
|
xlim([0.1, 500]);
|
|
|
|
|
|
|
|
% #+NAME: fig:sr_sp_psd_marble_compare
|
|
% #+CAPTION: Comparison of the ASD of the measured voltage from the Geophone on the marble
|
|
% #+RESULTS: fig:sr_sp_psd_marble_compare
|
|
% [[file:figs/sr_sp_psd_marble_compare.png]]
|
|
|
|
|
|
figure;
|
|
hold on;
|
|
plot(f, sqrt(pxsp_s), 'DisplayName', 'Spindle - 6rpm');
|
|
plot(f, sqrt(pxsr_s), 'DisplayName', 'Slip-Ring - 6rpm');
|
|
plot(f, sqrt(pxof_s), 'DisplayName', 'OFF');
|
|
hold off;
|
|
set(gca, 'xscale', 'log');
|
|
set(gca, 'yscale', 'log');
|
|
xlabel('Frequency [Hz]'); ylabel('ASD of the measured Voltage $\left[\frac{V}{\sqrt{Hz}}\right]$')
|
|
legend('Location', 'southwest');
|
|
xlim([0.1, 500]);
|