tdehaeze/nass-micro-station-measurements
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Update tangled file

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Thomas Dehaeze 2020-01-28 15:07:45 +01:00
parent b1bbae2f8f
commit 1a6d30f676
2 changed files with 31 additions and 2 deletions
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ground-motion/data/ground_meas_id31.zip
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ground-motion/matlab/ground_meas_id31.m
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@ -8,7 +8,7 @@ s = zpk('s');
data = load('mat/data_028.mat', 'data'); data = data.data;
% Time domain plots
% Time domain plots of the measured voltage
figure;
hold on;
@ -82,6 +82,35 @@ psd_gv = px_dc./abs(squeeze(freqresp(G0*S, f, 'Hz'))).^2;
psd_gm = psd_gv./(2*pi*f).^2;
% Time domain plots of the ground motion
% We can inverse the dynamics of the geophone to convert the measured voltage into the estimated ground motion.
est_vel = lsim(inv(G0*S)*(s/2/pi)/(1+s/2/pi), data(:, 1), data(:, 3)); % Estimated velocity above 1Hz
est_vel = est_vel - mean(est_vel(data(:,3)>10)); % The mean value of the velocity if removed
est_dis = lsim(1/(1+s/2/pi), est_vel, data(:, 3)); % The velocity is integrated above 1Hz
figure;
hold on;
plot(data(:, 3), est_vel);
hold off;
xlabel('Time [s]'); ylabel('Velocity [m/s]');
xlim([10, 100]);
% #+NAME: fig:time_domain_velocity
% #+CAPTION: Time domain velocity ([[./figs/time_domain_velocity.png][png]], [[./figs/time_domain_velocity.pdf][pdf]])
% [[file:figs/time_domain_velocity.png]]
figure;
hold on;
plot(data(:, 3), est_dis);
hold off;
xlabel('Time [s]'); ylabel('Displacement [m]');
xlim([10, 100]);
% Computation of the ASD of the velocity and displacement
% The ASD of the measured velocity is shown on figure [[fig:ground_motion_id31_asd_velocity]].
@ -135,7 +164,7 @@ xlim([0.1, 500]); ylim([1e-13, 1e3]);
% Save
% We save the PSD of the ground motion for further analysis.
save('./mat/psd_gm', 'f', 'psd_gm');
save('./mat/psd_gm.mat', 'f', 'psd_gm', 'psd_gv');
% Load the measurement data
% First we load the measurement data.