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Add few curves

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Thomas Dehaeze
2019-05-03 17:33:15 +02:00
parent 7aa568e55d
commit ec07f0b91e
5 changed files with 171 additions and 38 deletions
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slip-ring-test/figs/.gitignore vendored Normal file
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*.tex
*.pdf
*.svg

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slip-ring-test/index.html
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@@ -3,7 +3,7 @@
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<!-- 2019-05-02 jeu. 14:12 -->
<!-- 2019-05-03 ven. 14:39 -->
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Effect of the rotation of the Slip-Ring</title>
@@ -254,16 +254,16 @@ for the JavaScript code in this tag.
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#org4210b03">1. Measurement Description</a></li>
<li><a href="#org28261aa">2. Load data</a></li>
<li><a href="#org79cb6de">3. Analysis</a></li>
<li><a href="#org30f1cc1">4. Conclusion</a></li>
<li><a href="#orgfad781f">1. Measurement Description</a></li>
<li><a href="#org15aab25">2. Load data</a></li>
<li><a href="#orgf84fddf">3. Analysis</a></li>
<li><a href="#org072e1d4">4. Conclusion</a></li>
</ul>
</div>
</div>
<div id="outline-container-org4210b03" class="outline-2">
<h2 id="org4210b03"><span class="section-number-2">1</span> Measurement Description</h2>
<div id="outline-container-orgfad781f" class="outline-2">
<h2 id="orgfad781f"><span class="section-number-2">1</span> Measurement Description</h2>
<div class="outline-text-2" id="text-1">
<p>
Random Signal is generated by one DAC of the SpeedGoat.
@@ -352,8 +352,8 @@ Here, the rotation speed of the Slip-Ring is set to 1rpm.
</div>
</div>
<div id="outline-container-org28261aa" class="outline-2">
<h2 id="org28261aa"><span class="section-number-2">2</span> Load data</h2>
<div id="outline-container-org15aab25" class="outline-2">
<h2 id="org15aab25"><span class="section-number-2">2</span> Load data</h2>
<div class="outline-text-2" id="text-2">
<p>
We load the data of the z axis of two geophones.
@@ -366,11 +366,11 @@ sr_on = load<span class="org-rainbow-delimiters-depth-1">(</span><span class="o
</div>
</div>
<div id="outline-container-org79cb6de" class="outline-2">
<h2 id="org79cb6de"><span class="section-number-2">3</span> Analysis</h2>
<div id="outline-container-orgf84fddf" class="outline-2">
<h2 id="orgf84fddf"><span class="section-number-2">3</span> Analysis</h2>
<div class="outline-text-2" id="text-3">
<p>
Let's first look at the signal produced by the DAC (figure <a href="#orgf3a4e2b">1</a>).
Let's first look at the signal produced by the DAC (figure <a href="#org36eec0a">1</a>).
</p>
<div class="org-src-container">
@@ -384,20 +384,20 @@ xlim<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-rainbo
</div>
<div id="orgf3a4e2b" class="figure">
<div id="org36eec0a" class="figure">
<p><img src="figs/random_signal.png" alt="random_signal.png" />
</p>
<p><span class="figure-number">Figure 1: </span>Random signal produced by the DAC</p>
</div>
<p>
We now look at the difference between the signal directly measured by the ADC and the signal that goes through the slip-ring (figure <a href="#org07de8c8">2</a>).
We now look at the difference between the signal directly measured by the ADC and the signal that goes through the slip-ring (figure <a href="#orga6ca37c">2</a>).
</p>
<div class="org-src-container">
<pre class="src src-matlab"><span class="org-type">figure</span>;
hold on;
plot<span class="org-rainbow-delimiters-depth-1">(</span>sr_on.t, sr_on.x1 <span class="org-type">-</span> sr_on.x2, <span class="org-string">'DisplayName', '</span>Slip<span class="org-type">-</span>Ring <span class="org-type">-</span> $<span class="org-type">\</span>omega = <span class="org-highlight-numbers-number">1rpm$</span>'<span class="org-rainbow-delimiters-depth-1">)</span>;
plot<span class="org-rainbow-delimiters-depth-1">(</span>sr_on.t, sr_on.x1 <span class="org-type">-</span> sr_on.x2, <span class="org-string">'DisplayName', '</span>Slip<span class="org-type">-</span>Ring <span class="org-type">-</span> $<span class="org-type">\</span>omega = <span class="org-highlight-numbers-number">1rpm$</span>'<span class="org-rainbow-delimiters-depth-1">)</span>;
plot<span class="org-rainbow-delimiters-depth-1">(</span>sr_off.t, sr_off.x1 <span class="org-type">-</span> sr_off.x2,<span class="org-string">'DisplayName', 'Slip-Ring off'</span><span class="org-rainbow-delimiters-depth-1">)</span>;
hold off;
xlabel<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-string">'Time </span><span class="org-string"><span class="org-rainbow-delimiters-depth-2">[</span></span><span class="org-string">s</span><span class="org-string"><span class="org-rainbow-delimiters-depth-2">]</span></span><span class="org-string">'</span><span class="org-string"><span class="org-rainbow-delimiters-depth-1">)</span></span><span class="org-string">; ylabel</span><span class="org-string"><span class="org-rainbow-delimiters-depth-1">(</span></span><span class="org-string">'Voltage </span><span class="org-string"><span class="org-rainbow-delimiters-depth-2">[</span></span><span class="org-string">V</span><span class="org-string"><span class="org-rainbow-delimiters-depth-2">]</span></span><span class="org-string">'</span><span class="org-rainbow-delimiters-depth-1">)</span>;
@@ -407,16 +407,37 @@ legend<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-stri
</div>
<div id="org07de8c8" class="figure">
<div id="orga6ca37c" class="figure">
<p><img src="figs/slipring_comp_signals.png" alt="slipring_comp_signals.png" />
</p>
<p><span class="figure-number">Figure 2: </span>Alteration of the signal when the slip-ring is turning</p>
</div>
<div class="org-src-container">
<pre class="src src-matlab">dt = sr_on.t<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-highlight-numbers-number">2</span><span class="org-rainbow-delimiters-depth-1">)</span> <span class="org-type">-</span> sr_on.t<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-highlight-numbers-number">1</span><span class="org-rainbow-delimiters-depth-1">)</span>;
Fs = <span class="org-highlight-numbers-number">1</span><span class="org-type">/</span>dt; <span class="org-comment">% [Hz]</span>
win = hanning<span class="org-rainbow-delimiters-depth-1">(</span>ceil<span class="org-rainbow-delimiters-depth-2">(</span><span class="org-highlight-numbers-number">1</span><span class="org-type">*</span>Fs<span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>;
</pre>
</div>
<div class="org-src-container">
<pre class="src src-matlab"><span class="org-rainbow-delimiters-depth-1">[</span>pxx_on, f<span class="org-rainbow-delimiters-depth-1">]</span> = pwelch<span class="org-rainbow-delimiters-depth-1">(</span>sr_on.x1 <span class="org-type">-</span> sr_on.x2, win, <span class="org-rainbow-delimiters-depth-2">[]</span>, <span class="org-rainbow-delimiters-depth-2">[]</span>, Fs<span class="org-rainbow-delimiters-depth-1">)</span>;
<span class="org-rainbow-delimiters-depth-1">[</span>pxx_off, <span class="org-type">~</span><span class="org-rainbow-delimiters-depth-1">]</span> = pwelch<span class="org-rainbow-delimiters-depth-1">(</span>sr_off.x1 <span class="org-type">-</span> sr_off.x2, win, <span class="org-rainbow-delimiters-depth-2">[]</span>, <span class="org-rainbow-delimiters-depth-2">[]</span>, Fs<span class="org-rainbow-delimiters-depth-1">)</span>;
</pre>
</div>
<div id="orgc50d568" class="figure">
<p><img src="figs/psd_noise.png" alt="psd_noise.png" />
</p>
<p><span class="figure-number">Figure 3: </span>ASD of the measured noise</p>
</div>
</div>
</div>
<div id="outline-container-org30f1cc1" class="outline-2">
<h2 id="org30f1cc1"><span class="section-number-2">4</span> Conclusion</h2>
<div id="outline-container-org072e1d4" class="outline-2">
<h2 id="org072e1d4"><span class="section-number-2">4</span> Conclusion</h2>
<div class="outline-text-2" id="text-4">
<div class="note">
<p>
@@ -433,7 +454,7 @@ legend<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-stri
</div>
<div id="postamble" class="status">
<p class="author">Author: Thomas Dehaeze</p>
<p class="date">Created: 2019-05-02 jeu. 14:12</p>
<p class="date">Created: 2019-05-03 ven. 14:39</p>
<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
</div>
</body>

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slip-ring-test/index.org
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@@ -82,7 +82,7 @@ We now look at the difference between the signal directly measured by the ADC an
#+begin_src matlab :results none
figure;
hold on;
plot(sr_on.t, sr_on.x1 - sr_on.x2, 'DisplayName', 'Slip-Ring - $\omega = 1rpm$');
plot(sr_on.t, sr_on.x1 - sr_on.x2, 'DisplayName', 'Slip-Ring - $\omega = 1rpm$');
plot(sr_off.t, sr_off.x1 - sr_off.x2,'DisplayName', 'Slip-Ring off');
hold off;
xlabel('Time [s]'); ylabel('Voltage [V]');
@@ -101,6 +101,41 @@ We now look at the difference between the signal directly measured by the ADC an
#+RESULTS: fig:slipring_comp_signals
[[file:figs/slipring_comp_signals.png]]
#+begin_src matlab :results none
dt = sr_on.t(2) - sr_on.t(1);
Fs = 1/dt; % [Hz]
win = hanning(ceil(1*Fs));
#+end_src
#+begin_src matlab :results none
[pxx_on, f] = pwelch(sr_on.x1 - sr_on.x2, win, [], [], Fs);
[pxx_off, ~] = pwelch(sr_off.x1 - sr_off.x2, win, [], [], Fs);
#+end_src
#+begin_src matlab :results none :exports none
figure;
hold on;
plot(f, sqrt(pxx_on), 'DisplayName', 'Slip-Ring - $\omega = 1rpm$');
plot(f, sqrt(pxx_off),'DisplayName', 'Slip-Ring off');
hold off;
set(gca, 'xscale', 'log'); set(gca, 'yscale', 'log');
xlabel('Frequency [Hz]'); ylabel('PSD $\left[\frac{V}{\sqrt{Hz}}\right]$');
legend('Location', 'northeast');
xlim([1, 500]);
#+end_src
#+NAME: fig:psd_noise
#+HEADER: :tangle no :exports results :results value raw replace :noweb yes
#+begin_src matlab :var filepath="figs/psd_noise.pdf" :var figsize="wide-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+NAME: fig:psd_noise
#+CAPTION: ASD of the measured noise
#+RESULTS: fig:psd_noise
[[file:figs/psd_noise.png]]
* Conclusion
#+begin_note
*Remaining questions*: