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Add some discussion about the measurements

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Thomas Dehaeze 2021-05-06 16:27:04 +02:00
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@ -2469,15 +2469,21 @@ exportFig('figs/apa300ml_meas_freq_compare.pdf', 'width', 'full', 'height', 'tal
** Conclusion
When two flexible joints are fixed at each ends of the APA, the APA is mostly in a free/free condition in terms of bending/torsion (the bending/torsional stiffness of the joints being very small).
In the current tests, the APA are in a fixed/free condition.
Therefore, it is quite obvious that we measured higher resonance frequencies than what is foreseen for the struts.
It is however quite interesting that there is a factor $\approx \sqrt{2}$ between the two (increased of the stiffness by a factor 2?).
#+name: tab:apa300ml_measured_modes_freq
#+caption: Measured frequency of the modes
#+attr_latex: :environment tabularx :width 0.3\linewidth :align lX
#+attr_latex: :environment tabularx :width \linewidth :align lX
#+attr_latex: :center t :booktabs t :float t
| Mode | Measured Frequency |
|-----------+--------------------|
| X-Bending | 280Hz |
| Y-Bending | 410Hz |
| Z-Torsion | ? |
| Mode | Strut Mode | Measured Frequency |
|-----------+------------+--------------------|
| X-Bending | 189Hz | 280Hz |
| Y-Bending | 285Hz | 410Hz |
| Z-Torsion | 400Hz | ? |
* Bibliography :ignore:
#+latex: \printbibliography