110 lines
3.2 KiB
Matlab
110 lines
3.2 KiB
Matlab
%% Clear Workspace and Close figures
|
|
clear; close all; clc;
|
|
|
|
%% Intialize Laplace variable
|
|
s = zpk('s');
|
|
|
|
% Load data
|
|
% We load the data of the z axis of two geophones.
|
|
|
|
sr_of = load('mat/data_030.mat', 'data'); sr_of = sr_of.data;
|
|
sr_on = load('mat/data_031.mat', 'data'); sr_on = sr_on.data;
|
|
sr_6r = load('mat/data_032.mat', 'data'); sr_6r = sr_6r.data;
|
|
sr_60 = load('mat/data_033.mat', 'data'); sr_60 = sr_60.data;
|
|
|
|
% Time Domain
|
|
% We plot the time domain data for the direct measurement (figure [[fig:sr_direct_1khz_time]]) and for the signal going through the slip-ring (figure [[fig:sr_slipring_1khz_time]]);
|
|
|
|
|
|
figure;
|
|
hold on;
|
|
plot(sr_60(:, 3), sr_60(:, 1), 'DisplayName', '60rpm');
|
|
plot(sr_6r(:, 3), sr_6r(:, 1), 'DisplayName', '6rpm');
|
|
plot(sr_on(:, 3), sr_on(:, 1), 'DisplayName', 'ON');
|
|
plot(sr_of(:, 3), sr_of(:, 1), 'DisplayName', 'OFF');
|
|
hold off;
|
|
xlabel('Time [s]'); ylabel('Voltage [V]');
|
|
xlim([0, 100]);
|
|
legend('Location', 'northeast');
|
|
|
|
|
|
|
|
% #+NAME: fig:sr_direct_1khz_time
|
|
% #+CAPTION: Direct measurement
|
|
% #+RESULTS: fig:sr_direct_1khz_time
|
|
% [[file:figs/sr_direct_1khz_time.png]]
|
|
|
|
|
|
xlim([0, 0.2]); ylim([-2e-3, 2e-3]);
|
|
|
|
|
|
|
|
% #+NAME: fig:sr_direct_1khz_time_zoom
|
|
% #+CAPTION: Direct measurement - Zoom
|
|
% #+RESULTS: fig:sr_direct_1khz_time_zoom
|
|
% [[file:figs/sr_direct_1khz_time_zoom.png]]
|
|
|
|
|
|
figure;
|
|
hold on;
|
|
plot(sr_60(:, 3), sr_60(:, 2), 'DisplayName', '60rpm');
|
|
plot(sr_6r(:, 3), sr_6r(:, 2), 'DisplayName', '6rpm');
|
|
plot(sr_on(:, 3), sr_on(:, 2), 'DisplayName', 'ON');
|
|
plot(sr_of(:, 3), sr_of(:, 2), 'DisplayName', 'OFF');
|
|
hold off;
|
|
xlabel('Time [s]'); ylabel('Voltage [V]');
|
|
xlim([0, 100]);
|
|
legend('Location', 'northeast');
|
|
|
|
% Frequency Domain - Direct Signal
|
|
% We first compute some parameters that will be used for the PSD computation.
|
|
|
|
dt = sr_of(2, 3)-sr_of(1, 3);
|
|
|
|
Fs = 1/dt; % [Hz]
|
|
|
|
win = hanning(ceil(10*Fs));
|
|
|
|
|
|
|
|
% Then we compute the Power Spectral Density using =pwelch= function.
|
|
|
|
[px_d_of, f] = pwelch(sr_of(:, 1), win, [], [], Fs);
|
|
[px_d_on, ~] = pwelch(sr_on(:, 1), win, [], [], Fs);
|
|
[px_d_6r, ~] = pwelch(sr_6r(:, 1), win, [], [], Fs);
|
|
[px_d_60, ~] = pwelch(sr_60(:, 1), win, [], [], Fs);
|
|
|
|
figure;
|
|
hold on;
|
|
plot(f, sqrt(px_d_of), 'DisplayName', 'OFF');
|
|
plot(f, sqrt(px_d_on), 'DisplayName', 'ON');
|
|
plot(f, sqrt(px_d_6r), 'DisplayName', '6rpm');
|
|
plot(f, sqrt(px_d_60), 'DisplayName', '60rpm');
|
|
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', 'northeast');
|
|
xlim([0.1, 5000]);
|
|
|
|
% Frequency Domain - Slip-Ring Signal
|
|
|
|
[px_sr_of, f] = pwelch(sr_of(:, 2), win, [], [], Fs);
|
|
[px_sr_on, ~] = pwelch(sr_on(:, 2), win, [], [], Fs);
|
|
[px_sr_6r, ~] = pwelch(sr_6r(:, 2), win, [], [], Fs);
|
|
[px_sr_60, ~] = pwelch(sr_60(:, 2), win, [], [], Fs);
|
|
|
|
figure;
|
|
hold on;
|
|
plot(f, sqrt(px_sr_of), 'DisplayName', 'OFF');
|
|
plot(f, sqrt(px_sr_on), 'DisplayName', 'ON');
|
|
plot(f, sqrt(px_sr_6r), 'DisplayName', '6rpm');
|
|
plot(f, sqrt(px_sr_60), 'DisplayName', '60rpm');
|
|
plot(f, sqrt(px_d_of), '-k', 'DisplayName', 'Direct');
|
|
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', 'northeast');
|
|
xlim([0.1, 5000]);
|