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< / head >
< body >
< div id = "content" >
< h1 class = "title" > Effect of the rotation of the Slip-Ring< / h1 >
< div id = "table-of-contents" >
< h2 > Table of Contents< / h2 >
< div id = "text-table-of-contents" >
< ul >
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< 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 >
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< / ul >
< / div >
< / div >
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< div id = "outline-container-orgfad781f" class = "outline-2" >
< h2 id = "orgfad781f" > < span class = "section-number-2" > 1< / span > Measurement Description< / h2 >
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< div class = "outline-text-2" id = "text-1" >
< p >
Random Signal is generated by one DAC of the SpeedGoat.
< / p >
< p >
The signal going out of the DAC is split into two:
< / p >
< ul class = "org-ul" >
< li > one BNC cable is directly connected to one ADC of the SpeedGoat< / li >
< li > one BNC cable goes two times in the Slip-Ring (from bottom to top and then from top to bottom) and then is connected to one ADC of the SpeedGoat< / li >
< / ul >
< p >
Two measurements are done.
< / p >
< table border = "2" cellspacing = "0" cellpadding = "6" rules = "groups" frame = "hsides" >
< colgroup >
< col class = "org-left" / >
< col class = "org-left" / >
< / colgroup >
< thead >
< tr >
< th scope = "col" class = "org-left" > Data File< / th >
< th scope = "col" class = "org-left" > Description< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td class = "org-left" > < code > mat/data_001.mat< / code > < / td >
< td class = "org-left" > Slip-ring not turning< / td >
< / tr >
< tr >
< td class = "org-left" > < code > mat/data_002.mat< / code > < / td >
< td class = "org-left" > Slip-ring turning< / td >
< / tr >
< / tbody >
< / table >
< p >
For each measurement, the measured signals are:
< / p >
< table border = "2" cellspacing = "0" cellpadding = "6" rules = "groups" frame = "hsides" >
< colgroup >
< col class = "org-left" / >
< col class = "org-left" / >
< / colgroup >
< thead >
< tr >
< th scope = "col" class = "org-left" > Data File< / th >
< th scope = "col" class = "org-left" > Description< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td class = "org-left" > < code > t< / code > < / td >
< td class = "org-left" > Time vector< / td >
< / tr >
< tr >
< td class = "org-left" > < code > x1< / code > < / td >
< td class = "org-left" > Direct signal< / td >
< / tr >
< tr >
< td class = "org-left" > < code > x2< / code > < / td >
< td class = "org-left" > Signal going through the Slip-Ring< / td >
< / tr >
< / tbody >
< / table >
< p >
The goal is to determine is the signal is altered when the spindle is rotating.
< / p >
< p >
Here, the rotation speed of the Slip-Ring is set to 1rpm.
< / p >
< / div >
< / div >
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< div id = "outline-container-org15aab25" class = "outline-2" >
< h2 id = "org15aab25" > < span class = "section-number-2" > 2< / span > Load data< / h2 >
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< div class = "outline-text-2" id = "text-2" >
< p >
We load the data of the z axis of two geophones.
< / p >
< div class = "org-src-container" >
< pre class = "src src-matlab" > sr_off = load< span class = "org-rainbow-delimiters-depth-1" > (< / span > < span class = "org-string" > 'mat/data_001.mat', 't', 'x1', 'x2'< / span > < span class = "org-rainbow-delimiters-depth-1" > )< / span > ;
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< / pre >
< / div >
< / div >
< / div >
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< div id = "outline-container-orgf84fddf" class = "outline-2" >
< h2 id = "orgf84fddf" > < span class = "section-number-2" > 3< / span > Analysis< / h2 >
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< div class = "outline-text-2" id = "text-3" >
< p >
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Let's first look at the signal produced by the DAC (figure < a href = "#org36eec0a" > 1< / a > ).
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< / pre >
< / div >
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< div id = "org36eec0a" class = "figure" >
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< 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 >
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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 > ).
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< / p >
< div class = "org-src-container" >
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xlim< span class = "org-rainbow-delimiters-depth-1" > (< / span > < span class = "org-rainbow-delimiters-depth-2" > [< / span > < span class = "org-highlight-numbers-number" > 0< / span > < span class = "org-highlight-numbers-number" > 10< / span > < span class = "org-rainbow-delimiters-depth-2" > ]< / span > < span class = "org-rainbow-delimiters-depth-1" > )< / span > ;
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< / pre >
< / div >
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< div id = "orga6ca37c" class = "figure" >
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< 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 >
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< 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 > ;
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< div id = "orgc50d568" class = "figure" >
< p > < img src = "figs/psd_noise.png" alt = "psd_noise.png" / >
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< p > < span class = "figure-number" > Figure 3: < / span > ASD of the measured noise< / p >
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< h2 id = "org072e1d4" > < span class = "section-number-2" > 4< / span > Conclusion< / h2 >
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< b > Remaining questions< / b > :
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< li > Should the measurement be redone using voltage amplifiers?< / li >
< li > Use higher rotation speed and measure for longer periods (to have multiple revolutions) ?< / li >
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< div id = "postamble" class = "status" >
< p class = "author" > Author: Thomas Dehaeze< / p >
2019-05-03 17:33:15 +02:00
< p class = "date" > Created: 2019-05-03 ven. 14:39< / p >
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< p class = "validation" > < a href = "http://validator.w3.org/check?uri=referer" > Validate< / a > < / p >
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