63 lines
1.4 KiB
Matlab
63 lines
1.4 KiB
Matlab
%% 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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addpath('./mat/');
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% Results :ignore:
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% Let's load the measurement results.
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load('meas_stiff_probe.mat', 't', 'd', 'dp', 'F')
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%% Sampling time [s]
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Ts = (t(end) - t(1))/(length(t)-1);
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%% Remove first second
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t = t(ceil(1/Ts):end);
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d = d(ceil(1/Ts):end);
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dp = dp(ceil(1/Ts):end);
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F = F(ceil(1/Ts):end);
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%% Remove Offset
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t = t - t(1);
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F = F - mean(F(1:ceil(1/Ts)));
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% The time domain measured force and displacement are shown in Figure [[fig:mahr_time_domain]].
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%% Time Domain plots
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figure;
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tiledlayout(2, 1, 'TileSpacing', 'None', 'Padding', 'None');
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ax1 = nexttile;
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plot(t, F);
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ylabel('Force [N]'); set(gca, 'XTickLabel',[]);
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ax2 = nexttile;
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plot(t, d);
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xlabel('Time [s]'); ylabel('Displacement [m]');
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% #+RESULTS:
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% : Stiffness is 0.039 [N/mm]
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% This is very close to the 0.04 [N/mm] written in the [[file:doc/tmp3m0cvmue_7888038c-cdc8-48d8-a837-35de02760685.pdf][Millimar 1318 probe datasheet]].
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% And compare the linear fit with the raw measurement data (Figure [[fig:mahr_stiffness_f_d_plot]]).
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figure;
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hold on;
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plot(F, d, 'DisplayName', 'Raw data');
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plot(F, F/(d\F), 'DisplayName', 'Linear fit');
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hold off;
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xlabel('Measured Force [N]');
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ylabel('Measured Displacement [m]');
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legend('location', 'southeast');
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