124 lines
4.0 KiB
Org Mode
124 lines
4.0 KiB
Org Mode
#+TITLE: Ground Motion Measurements
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:drawer:
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#+STARTUP: overview
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#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../css/htmlize.css"/>
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#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../css/readtheorg.css"/>
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#+HTML_HEAD: <script src="../js/jquery.min.js"></script>
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#+HTML_HEAD: <script src="../js/bootstrap.min.js"></script>
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#+HTML_HEAD: <script src="../js/jquery.stickytableheaders.min.js"></script>
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#+HTML_HEAD: <script src="../js/readtheorg.js"></script>
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#+LATEX_CLASS: cleanreport
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#+LaTeX_CLASS_OPTIONS: [tocnp, secbreak, minted]
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#+PROPERTY: header-args:matlab :session *MATLAB*
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#+PROPERTY: header-args:matlab+ :comments org
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#+PROPERTY: header-args:matlab+ :exports both
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#+PROPERTY: header-args:matlab+ :eval no-export
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#+PROPERTY: header-args:matlab+ :noweb yes
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#+PROPERTY: header-args:matlab+ :mkdirp yes
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#+PROPERTY: header-args:matlab+ :output-dir figs
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:end:
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[[../index.org][Back to main page]].
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#+begin_src matlab :exports none :results silent
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<<matlab-init>>
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#+end_src
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* Preprocessing of id31 ground motion measurement
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#+begin_src matlab :exports code :results silent
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data = table2array(readtable('./data/id31_camac_floor_PSD_october2014.txt'));
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#+end_src
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The first column is the frequency vector in Hz.
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#+begin_src matlab :exports code :results silent
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gm.freqs = data(:, 1);
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#+end_src
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The other colmns are the PSD of the ground velocity in $\frac{(\mu m/s)^2}{Hz}$ for the x,y,z axis.
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It is converted to $\frac{(m/s)^2}{Hz}$.
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#+begin_src matlab :exports code :results silent
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gm.psd_vx = 1e-12*data(:, 2);
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gm.psd_vy = 1e-12*data(:, 3);
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gm.psd_vz = 1e-12*data(:, 4);
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#+end_src
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Finally, we integrate the signal to obtain the power spectral density of the ground displacement.
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#+begin_src matlab :results silent
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gm.psd_dx = gm.psd_vx./(2*pi*gm.freqs);
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gm.psd_dy = gm.psd_vy./(2*pi*gm.freqs);
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gm.psd_dz = gm.psd_vz./(2*pi*gm.freqs);
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#+end_src
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The pre-processed data are saved.
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#+begin_src matlab :results silent
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save('./data/gm_esrf.mat', 'gm');
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#+end_src
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* Plots
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We load measurements made:
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- at ID31
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- at ID09
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- at CERN
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#+begin_src matlab :results silent
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id31 = load('./data/ground_motion_psd.mat');
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id09 = load('./data/id09_floor_september2018.mat');
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cern = load('./data/ground_motion_dist.mat');
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#+end_src
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** ID09 Measurements - Time Domain
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#+begin_src matlab :results silent
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figure;
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hold on;
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plot(id09.time3, 1e-6*id09.x_y_z(:, 1), 'DisplayName', 'dx');
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plot(id09.time3, 1e-6*id09.x_y_z(:, 2), 'DisplayName', 'dy');
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plot(id09.time3, 1e-6*id09.x_y_z(:, 3), 'DisplayName', 'dz');
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hold off;
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xlabel('Time [s]'); ylabel('Velocity [$m/s$]');
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legend();
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#+end_src
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#+NAME: fig:id09_time_domain
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#+HEADER: :tangle no :exports results :results raw :noweb yes
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#+begin_src matlab :var filepath="figs/id09_time_domain.pdf" :var figsize="wide-tall" :post pdf2svg(file=*this*, ext="png")
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<<plt-matlab>>
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#+end_src
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#+NAME: fig:id09_time_domain
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#+CAPTION: Time domain data - ID09
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#+RESULTS: fig:id09_time_domain
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[[file:figs/id09_time_domain.png]]
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** Compute PSD of ID09 ground motion
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#+begin_src matlab :results silent
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[id09_pxx, id09_f] = pwelch(1e-6*id09.x_y_z(:, 1), hanning(ceil(length(1e-6*id09.x_y_z(:, 1))/10)), 0, [], 1/(id09.time3(end)/(length(id09.time3) - 1)));
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#+end_src
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** Compare PSD of Cern, ID09 and ID31
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#+begin_src matlab :results silent
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figure;
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hold on;
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plot(cern.gm.freq, cern.gm.psd, 'DisplayName', 'CERN');
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plot(id31.freqs, id31.psd_dx, 'DisplayName', 'ID31');
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plot(id09_f, id09_pxx, 'DisplayName', 'ID09');
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hold off;
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set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
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xlabel('Frequency [Hz]'); ylabel('PSD [$m^2/Hz$]');
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legend('Location', 'northeast');
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#+end_src
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#+NAME: fig:psd_comparison
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#+HEADER: :tangle no :exports results :results raw :noweb yes
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#+begin_src matlab :var filepath="figs/psd_comparison.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
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<<plt-matlab>>
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#+end_src
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#+NAME: fig:psd_comparison
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#+CAPTION: Comparison of the PSD of ground motion
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#+RESULTS: fig:psd_comparison
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[[file:figs/psd_comparison.png]]
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