Deleted old measurement on the spindle

disturbance-sr-rz/index.org

@@ -116,13 +116,15 @@ A movie showing the experiment is shown on figure [[fig:exp_sl_sp_gif]].
 We convert the measured voltage to velocity using the function =voltageToVelocityL22= (accessible [[file:~/MEGA/These/meas/src/index.org][here]]).
 
 #+begin_src matlab
-  of(:, 1) = voltageToVelocityL22(of(:, 1), of(:, 3), 60);
-  sr(:, 1) = voltageToVelocityL22(sr(:, 1), sr(:, 3), 60);
-  sp(:, 1) = voltageToVelocityL22(sp(:, 1), sp(:, 3), 60);
+  gain = 60; % [dB]
 
-  of(:, 2) = voltageToVelocityL22(of(:, 2), of(:, 3), 60);
-  sr(:, 2) = voltageToVelocityL22(sr(:, 2), sr(:, 3), 60);
-  sp(:, 2) = voltageToVelocityL22(sp(:, 2), sp(:, 3), 60);
+  of(:, 1) = voltageToVelocityL22(of(:, 1), of(:, 3), gain);
+  sr(:, 1) = voltageToVelocityL22(sr(:, 1), sr(:, 3), gain);
+  sp(:, 1) = voltageToVelocityL22(sp(:, 1), sp(:, 3), gain);
+
+  of(:, 2) = voltageToVelocityL22(of(:, 2), of(:, 3), gain);
+  sr(:, 2) = voltageToVelocityL22(sr(:, 2), sr(:, 3), gain);
+  sp(:, 2) = voltageToVelocityL22(sp(:, 2), sp(:, 3), gain);
 #+end_src
 
 ** Time domain plots
@@ -172,6 +174,21 @@ We convert the measured voltage to velocity using the function =voltageToVelocit
 #+RESULTS: fig:slip_ring_spindle_sample_time
 [[file:figs/slip_ring_spindle_sample_time.png]]
 
+#+begin_src matlab :exports none :tangle no
+  xlim([0, 1]);
+#+end_src
+
+#+NAME: fig:slip_ring_spindle_sample_zoom
+#+HEADER: :tangle no :exports results :results value raw replace :noweb yes
+#+begin_src matlab :var filepath="figs/slip_ring_spindle_sample_zoom.pdf" :var figsize="wide-normal" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:slip_ring_spindle_sample_zoom
+#+CAPTION: Velocity as measured by the geophone at the sample location - Time domain
+#+RESULTS: fig:slip_ring_spindle_sample_zoom
+[[file:figs/slip_ring_spindle_sample_zoom.png]]
+
 ** Frequency Domain
 We first compute some parameters that will be used for the PSD computation.
 #+begin_src matlab :results none
@@ -193,11 +210,18 @@ First for the geophone located on the marble
 
 And for the geophone located at the sample position.
 #+begin_src matlab
-  [pxof_s, f] = pwelch(of(:, 2), win, [], [], Fs);
+  [pxof_s, ~] = pwelch(of(:, 2), win, [], [], Fs);
   [pxsr_s, ~] = pwelch(sr(:, 2), win, [], [], Fs);
   [pxsp_s, ~] = pwelch(sp(:, 2), win, [], [], Fs);
 #+end_src
 
+And finally for the relative velocity between the sample and the marble.
+#+begin_src matlab
+  [pxof_r, ~] = pwelch(of(:, 2)-of(:, 1), win, [], [], Fs);
+  [pxsr_r, ~] = pwelch(sr(:, 2)-sr(:, 1), win, [], [], Fs);
+  [pxsp_r, ~] = pwelch(sp(:, 2)-sp(:, 1), win, [], [], Fs);
+#+end_src
+
 And we plot the ASD of the measured velocities:
 - figure [[fig:sr_sp_psd_marble_compare]] for the geophone located on the marble
 - figure [[fig:sr_sp_psd_sample_compare]] for the geophone at the sample position
@@ -252,11 +276,37 @@ And we plot the ASD of the measured velocities:
 #+RESULTS: fig:sr_sp_psd_sample_compare
 [[file:figs/sr_sp_psd_sample_compare.png]]
 
+#+begin_src matlab :results none
+  figure;
+  hold on;
+  plot(f, sqrt(pxsp_r), 'DisplayName', 'Spindle - 6rpm');
+  plot(f, sqrt(pxsr_r), 'DisplayName', 'Slip-Ring - 6rpm');
+  plot(f, sqrt(pxof_r), 'DisplayName', 'OFF');
+  hold off;
+  set(gca, 'xscale', 'log');
+  set(gca, 'yscale', 'log');
+  xlabel('Frequency [Hz]'); ylabel('ASD of the relative velocity $\left[\frac{m/s}{\sqrt{Hz}}\right]$')
+  legend('Location', 'southwest');
+  xlim([2, 500]);
+#+end_src
+
+#+NAME: fig:sr_sp_psd_relative_compare
+#+HEADER: :tangle no :exports results :results value raw replace :noweb yes
+#+begin_src matlab :var filepath="figs/sr_sp_psd_relative_compare.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:sr_sp_psd_relative_compare
+#+CAPTION: Comparison of the ASD of the relative velocity
+#+RESULTS: fig:sr_sp_psd_relative_compare
+[[file:figs/sr_sp_psd_relative_compare.png]]
+
 ** Conclusion
 #+begin_important
   - The slip-ring rotation induces almost no vibrations on the marble, and only a little vibrations on the sample above 100Hz.
 
   - The spindle rotation induces a lot of vibrations of the sample as well as on the granite.
-  - There is a huge peak at 24Hz on the sample vibration but not on the granite vibration. The peak is really sharp, could this be due to magnetic effect?
-    - Should redo the measurement with piezo accelerometers
+  - There is a huge peak at 24Hz on the sample vibration but not on the granite vibration
+    - The peak is really sharp, could this be due to magnetic effect?
+    - Should redo the measurement with piezo accelerometers.
 #+end_important