Update paper
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:DRAWER:
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#+LATEX_CLASS: jacow
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#+LATEX_CLASS_OPTIONS: [a4paper, keeplastbox, biblatex, boxit]
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#+OPTIONS: toc:nil
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#+STARTUP: overview
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@ -29,6 +30,7 @@
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* BUILD :noexport:
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#+NAME: startblock
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#+BEGIN_SRC emacs-lisp :results none
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;; LaTeX class
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(add-to-list 'org-latex-classes
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'("jacow"
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"\\documentclass{jacow}"
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@ -38,7 +40,21 @@
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("\\paragraph{%s}" . "\\paragraph*{%s}")
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("\\subparagraph{%s}" . "\\subparagraph*{%s}"))
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)
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#+END_SRC
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;; Remove automatic org headings
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(defun my-latex-filter-removeOrgAutoLabels (text backend info)
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"Org-mode automatically generates labels for headings despite explicit use of `#+LABEL`. This filter forcibly removes all automatically generated org-labels in headings."
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(when (org-export-derived-backend-p backend 'latex)
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(replace-regexp-in-string "\\\\label{sec:org[a-f0-9]+}\n" "" text)))
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(add-to-list 'org-export-filter-headline-functions
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'my-latex-filter-removeOrgAutoLabels)
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#+end_src
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In order to compile this document, just use the =latexmk= command.
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#+begin_src emacs-lisp
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(async-shell-argument "latexmk")
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#+end_src
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* ABSTRACT :ignore:
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#+BEGIN_abstract
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@ -56,22 +72,85 @@ The presented development approach is foreseen to be applied more frequently to
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#+END_abstract
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* INTRODUCTION
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** Establish Significance :ignore:
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See cite:dehaeze18_sampl_stabil_for_tomog_exper.
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* NANO ACTIVE STABILIZATION SYSTEM
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** Previous and/or current research and contributions :ignore:
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** Locate a gap in the research / problem / question / prediction :ignore:
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** The present work :ignore:
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cite:rankers98_machin
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cite:dehaeze21_activ_dampin_rotat_platf_using
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cite:souleille18_concep_activ_mount_space_applic
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cite:brumund21_multib_simul_reduc_order_flexib_bodies_fea
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cite:dehaeze18_sampl_stabil_for_tomog_exper
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* NASS - MECHATRONIC APPROACH
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** The ID31 Micro Station
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The ID31 Micro Station is used to position samples along complex trajectories cite:dehaeze18_sampl_stabil_for_tomog_exper.
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It is composed of several stacked stages (represented in yellow in Fig. ref:fig:nass_concept_schematic).
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This allows this station to have high mobility, however, this limits the position accuracy to tens of $\mu m$.
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** The Nano Active Stabilization System
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The Nano Active Stabilization System (NASS) is a system whose goal is to improve the positioning accuracy of the ID31 Micro Station.
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It is represented in Fig. ref:fig:nass_concept_schematic and consists of three main elements:
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- a nano-hexapod located between the sample to be positioned and the micro-station.
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- a interferometric metrology system measuring the sample's position with respect to the focusing optics
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- a control system (not represented), which base on the measured position, properly actuates the nano-hexapod in order to stabilize the sample's position
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#+name: fig:nass_concept_schematic
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#+attr_latex: :scale 1
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#+caption: Nano Active Stabilization System - Schematic representation. 1) micro-station, 2) nano-hexapod, 3) sample, 4) metrology system
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[[file:figs/nass_concept_schematic.pdf]]
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* MECHATRONIC APPROACH
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** Mechatronic Approach - Overview
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In order to design the NASS in a predictive way, a mechatronic approach is used (schematically represented in Fig. ref:fig:nass_mechatronics_approach).
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It consists of three main phases.
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First the conceptual phase, where simple models and used, and the
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Once the concept is validated, the detail design phase
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Finally, there is the experimental phase in which the nano-hexapod is mounted, and several test benches are used to confirm the behavior of each individual elements.
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#+name: fig:nass_mechatronics_approach
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#+attr_latex: :float multicolumn :width \linewidth
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#+caption: Overview of the mechatronic approach
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[[file:figs/nass_mechatronics_approach.pdf]]
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** Models
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Several models are used throughout all the project.
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At the beginning of the conceptual phase, simple "mass-spring-dampers" models (Figure ref:fig:mass_spring_damper_hac_lac) were used to gain some understanding of the trade-offs.
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It has been concluded that a rather soft nano-hexapod
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These models are very easy to use, and
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Rapidly, a multi-body model (Figure ref:fig:nass_simscape_3d)
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- represents the rotation ref to the paper
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-
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During the detail design phase, the nano-hexapod model can be easily updated by importing the 3D parts exported from the CAD software.
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The key elements of the nano-hexapod such as the flexible joints and the APA are optimized using a Finite Element Software.
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As the flexible modes of the system are what generally limit the controller bandwidth, they are important to model in order to understand which are problematic and which are to be maximized.
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In order to do so, a "super-element" can be exported and imported in Simscape (Figure ref:fig:super_element_simscape)
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- [ ] Table that compares the three models in terms of:
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- time simulation
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- FRF
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- accuracy
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- easy to use
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During the experimental phase, the models are refined using the measurements.
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The models are stiff very useful to understand the measurements and the associated limitations.
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They are used to have a better insight on which measures to take in order to overcome the current limitations.
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For instance, it has been found that when fixing encoders to the struts (Figure ref:fig:nano_hexapod_elements), several flexible modes of the APA were appearing the dynamics which render the control using the encoders very complex.
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Therefore, an alternative configuration with the encoders fixed to the plates instead was used.
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#+begin_export latex
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\begin{figure*}[htbp]
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\begin{subfigure}[t]{0.25\linewidth}
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@ -99,23 +178,67 @@ See cite:dehaeze18_sampl_stabil_for_tomog_exper.
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* NANO-HEXAPOD DESIGN
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** Nano-Hexapod Specifications
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A CAD view of the nano-hexapod is shown in Figure ref:fig:nano_hexapod_elements.
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It is composed of 6 struts fixed in between two plates.
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Each strut is composed of one flexible joints at each end, and one actuator (Figure ref:fig:picture_nano_hexapod_strut).
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).
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And encoder can be fixed to the struts as shown, but can also be directly fixed to the plates (not represented here).
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Basic specifications:
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- Limited height (95mm)
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- Stroke $\approx 100\,\mu m$
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- Load up to $50\,kg$
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Based on the models used throughout the mechatronic approach, several specifications was obtained in order to maximize the performances of the system:
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- Axial stiffness of the struts $\approx 2\,\mu m/N$ such that the nano-hexapod dynamics is insensible to the rotation as well as decoupled from the micro-station dynamics
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- Small bending stiffness and high axial stiffness of the flexible joints
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- Precise positioning of the $b_i$ and $\hat{s}_i$
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- Flexible modes of the top-plate as high as possible
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- Integration of a force sensor for active damping purposes (more in the next section)
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** Parts' Optimization
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- APA / Flexible Joints / Plates
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The flexible joints and the top plates have been optimize using a Finite Element Model combine with the multi-body model of the nano-hexapod.
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The actuators are APA300ML from Cedrat Technologies.
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Three stacks: two as actuator one as sensor
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#+name: fig:nano_hexapod_elements
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#+attr_latex: :float multicolumn :width \linewidth
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#+caption: CAD view of the nano-hexapod with key elements
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[[file:figs/nano_hexapod_elements.pdf]]
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** Mounted Nano-Hexapod
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- Mounting benches
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#+name: fig:picture_nano_hexapod_strut
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#+attr_latex: :width \linewidth
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#+attr_latex: :width 0.9\linewidth
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#+caption: Picture of a nano-hexapod's strut
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[[file:figs/picture_nano_hexapod_strut.pdf]]
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#+name: fig:nano_hexapod_picture
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#+attr_latex: :width \linewidth
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#+attr_latex: :width 0.9\linewidth
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#+caption: Picture of the Nano-Hexapod on top of the ID31 micro-station
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[[file:figs/nano_hexapod_picture.jpg]]
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* TEST-BENCHES
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** Flexible Joints and Instrumentation
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** APA/Struts Dynamics
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Several test benches were used for all the critical elements of the nano-hexapod.
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For instant, the bending stiffness of the flexible joints are measured, and the model is refined.
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The measurement noise of the encoders are also measured, and the input/output relationship and the output voltage noise of the voltage amplifiers are measured.
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Perhaps the most important test bench was the one used to identify the dynamics of the amplified piezoelectric actuator (shown in Figure ref:fig:test_bench_apa_schematic).
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It consist of a $5\,\text{kg}$ granite vertical guided with an air bearing and fixed on top of the APA.
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An excitation signal (low pass filtered white noise) is generated and applied to two of the piezoelectric stacks.
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Both the voltage generated by the third piezoelectric stack and the displacement measured by the encoder are recorded.
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The two obtained FRF can then be compared with the model and the piezoelectric constant are identified.
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These constants are used to do the conversion from the mechanical domain (force, strain) easily accessible on the model to the electrical domain (voltages, charges) easily measured.
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After identification of these constant, the match between the measured FRF and the model dynamics is quite good (Figure ref:fig:apa_test_bench_results)
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The same bench was also used with the struts in order to study the effects of the flexible joints.
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#+name: fig:test_bench_apa_schematic
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#+attr_latex: :scale 1
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@ -140,11 +263,11 @@ See cite:dehaeze18_sampl_stabil_for_tomog_exper.
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\end{figure}
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#+end_export
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* CONTROL RESULTS
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** Nano-Hexapod
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#+name: fig:nass_hac_lac_schematic_test
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#+attr_latex: :width \linewidth
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#+caption: HAC-LAC Strategy - Block Diagram. The signals are: $\bm{r}$ the wanted sample's position, $\bm{X}$ the measured sample's position, $\bm{\epsilon}_{\mathcal{X}}$ the sample's position error, $\bm{\epsilon}_{\mathcal{L}}$ the sample position error expressed in the "frame" of the nano-hexapod struts, $\bm{u}$ the generated DAC voltages applied to the voltage amplifiers and then to the piezoelectric actuator stacks, $\bm{u}^\prime$ the new inputs corresponding to the damped plant, $\bm{\tau}$ the measured sensor stack voltages. $\bm{T}$ is . $\bm{K}_{\tiny IFF}$ is the Low Authority Controller used for active damping. $\bm{K}_{\mathcal{L}}$ is the High Authority Controller.
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#+caption: HAC-LAC Strategy - Block Diagram. The signals are: $\bm{r}$ the wanted sample's position, $\bm{X}$ the measured sample's position, $\bm{\epsilon}_{\mathcal{X}}$ the sample's position error, $\bm{\epsilon}_{\mathcal{L}}$ the sample position error expressed in the "frame" of the nano-hexapod struts, $\bm{u}$ the generated DAC voltages applied to the voltage amplifiers and then to the piezoelectric actuator stacks, $\bm{u}^\prime$ the new inputs corresponding to the damped plant, $\bm{\tau}$ the measured sensor stack voltages. $\bm{T}$ is . $\bm{K}_{\tiny IFF}$ is the Low Authority Controller used for active damping. $\bm{K}_{L}$ is the High Authority Controller.
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[[file:figs/nass_hac_lac_block_diagram_without_elec.pdf]]
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@ -166,4 +289,4 @@ This research was made possible by a grant from the FRIA.
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We thank the following people for their support, without whose help this work would never have been possible: V. Honkimaki, L. Ducotte and M. Lessourd and the whole team of the Precision Mechatronic Laboratory.
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* REFERENCES :ignore:
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\printbibliography
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\printbibliography{}
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Binary file not shown.
@ -1,4 +1,4 @@
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% Created 2021-07-13 mar. 00:51
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% Created 2021-07-13 mar. 13:05
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% Intended LaTeX compiler: pdflatex
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\documentclass[a4paper, keeplastbox, biblatex, boxit]{jacow}
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@ -32,12 +32,24 @@ The presented development approach is foreseen to be applied more frequently to
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\end{abstract}
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\section{INTRODUCTION}
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\label{sec:org0bd2d65}
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See \cite{dehaeze18_sampl_stabil_for_tomog_exper}.
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\cite{rankers98_machin}
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\cite{dehaeze21_activ_dampin_rotat_platf_using}
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\cite{souleille18_concep_activ_mount_space_applic}
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\cite{brumund21_multib_simul_reduc_order_flexib_bodies_fea}
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\cite{dehaeze18_sampl_stabil_for_tomog_exper}
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\section{NANO ACTIVE STABILIZATION SYSTEM}
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\label{sec:orgcb63b2b}
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The Nano Active Stabilization System (NASS) is a system whose goal is to improve the positioning accuracy of an existing positioning station (the ``micro-station'') used on ID31.
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It is represented in Figure \ref{fig:nass_concept_schematic} and consists of three main elements:
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\begin{itemize}
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\item the nano-hexapod located between the sample to be positioned and the micro-station.
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\item a interferometric metrology system measuring the sample's position with respect to the focusing optics
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\item a control system, which base on the measured position, properly actuates the nano-hexapod in order to stabilize the sample's position
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\end{itemize}
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\begin{figure}[htbp]
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\centering
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@ -46,13 +58,56 @@ See \cite{dehaeze18_sampl_stabil_for_tomog_exper}.
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\end{figure}
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\section{MECHATRONIC APPROACH}
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\label{sec:orgd2030b5}
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An overview of the mechatronic approach is schematically shown in Figure \ref{fig:nass_mechatronics_approach}.
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It consists of three main phases.
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First the conceptual phase, where simple models and used, and the
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Once the concept is validated, the detail design phase
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Finally, there is the experimental phase in which the nano-hexapod is mounted, and several test benches are used to confirm the behavior of each individual elements.
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\begin{figure*}
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\centering
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\includegraphics[scale=1,width=\linewidth]{figs/nass_mechatronics_approach.pdf}
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\caption{\label{fig:nass_mechatronics_approach}Overview of the mechatronic approach}
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\end{figure*}
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Several models are used throughout all the project.
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At the beginning of the conceptual phase, simple ``mass-spring-dampers'' models (Figure \ref{fig:mass_spring_damper_hac_lac}) were used to gain some understanding of the trade-offs.
|
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It has been concluded that a rather soft nano-hexapod
|
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|
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These models are very easy to use, and
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|
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Rapidly, a multi-body model (Figure \ref{fig:nass_simscape_3d})
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\begin{itemize}
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\item represents the rotation ref to the paper
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\item
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\end{itemize}
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During the detail design phase, the nano-hexapod model can be easily updated by importing the 3D parts exported from the CAD software.
|
||||
The key elements of the nano-hexapod such as the flexible joints and the APA are optimized using a Finite Element Software.
|
||||
As the flexible modes of the system are what generally limit the controller bandwidth, they are important to model in order to understand which are problematic and which are to be maximized.
|
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In order to do so, a ``super-element'' can be exported and imported in Simscape (Figure \ref{fig:super_element_simscape})
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\begin{itemize}
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\item[{$\square$}] Table that compares the three models in terms of:
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\begin{itemize}
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\item time simulation
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\item FRF
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\item accuracy
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\item easy to use
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\end{itemize}
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\end{itemize}
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|
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During the experimental phase, the models are refined using the measurements.
|
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The models are stiff very useful to understand the measurements and the associated limitations.
|
||||
They are used to have a better insight on which measures to take in order to overcome the current limitations.
|
||||
|
||||
For instance, it has been found that when fixing encoders to the struts (Figure \ref{fig:nano_hexapod_elements}), several flexible modes of the APA were appearing the dynamics which render the control using the encoders very complex.
|
||||
Therefore, an alternative configuration with the encoders fixed to the plates instead was used.
|
||||
|
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|
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\begin{figure*}[htbp]
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\begin{subfigure}[t]{0.25\linewidth}
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\centering
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@ -78,7 +133,6 @@ See \cite{dehaeze18_sampl_stabil_for_tomog_exper}.
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\section{NANO-HEXAPOD DESIGN}
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\label{sec:org923eba1}
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\begin{figure*}
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\centering
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@ -88,18 +142,31 @@ See \cite{dehaeze18_sampl_stabil_for_tomog_exper}.
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\begin{figure}[htbp]
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\centering
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\includegraphics[scale=1,width=\linewidth]{figs/picture_nano_hexapod_strut.pdf}
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\includegraphics[scale=1,width=0.9\linewidth]{figs/picture_nano_hexapod_strut.pdf}
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\caption{\label{fig:picture_nano_hexapod_strut}Picture of a nano-hexapod's strut}
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\end{figure}
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\begin{figure}[htbp]
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\centering
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\includegraphics[scale=1,width=\linewidth]{figs/nano_hexapod_picture.jpg}
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\includegraphics[scale=1,width=0.9\linewidth]{figs/nano_hexapod_picture.jpg}
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\caption{\label{fig:nano_hexapod_picture}Picture of the Nano-Hexapod on top of the ID31 micro-station}
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\end{figure}
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\section{TEST-BENCHES}
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\label{sec:orgeb70416}
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Several test benches were used for all the critical elements of the nano-hexapod.
|
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For instant, the bending stiffness of the flexible joints are measured, and the model is refined.
|
||||
The measurement noise of the encoders are also measured, and the input/output relationship and the output voltage noise of the voltage amplifiers are measured.
|
||||
|
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Perhaps the most important test bench was the one used to identify the dynamics of the amplified piezoelectric actuator (shown in Figure \ref{fig:test_bench_apa_schematic}).
|
||||
It consist of a \(5\,\text{kg}\) granite vertical guided with an air bearing and fixed on top of the APA.
|
||||
An excitation signal (low pass filtered white noise) is generated and applied to two of the piezoelectric stacks.
|
||||
Both the voltage generated by the third piezoelectric stack and the displacement measured by the encoder are recorded.
|
||||
The two obtained FRF can then be compared with the model and the piezoelectric constant are identified.
|
||||
These constants are used to do the conversion from the mechanical domain (force, strain) easily accessible on the model to the electrical domain (voltages, charges) easily measured.
|
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After identification of these constant, the match between the measured FRF and the model dynamics is quite good (Figure \ref{fig:apa_test_bench_results})
|
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|
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The same bench was also used with the struts in order to study the effects of the flexible joints.
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\begin{figure}[htbp]
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\centering
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@ -124,12 +191,11 @@ See \cite{dehaeze18_sampl_stabil_for_tomog_exper}.
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\end{figure}
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\section{CONTROL RESULTS}
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\label{sec:org2dca095}
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\begin{figure}[htbp]
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\centering
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\includegraphics[scale=1,width=\linewidth]{figs/nass_hac_lac_block_diagram_without_elec.pdf}
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\caption{\label{fig:nass_hac_lac_schematic_test}HAC-LAC Strategy - Block Diagram. The signals are: \(\bm{r}\) the wanted sample's position, \(\bm{X}\) the measured sample's position, \(\bm{\epsilon}_{\mathcal{X}}\) the sample's position error, \(\bm{\epsilon}_{\mathcal{L}}\) the sample position error expressed in the ``frame'' of the nano-hexapod struts, \(\bm{u}\) the generated DAC voltages applied to the voltage amplifiers and then to the piezoelectric actuator stacks, \(\bm{u}^\prime\) the new inputs corresponding to the damped plant, \(\bm{\tau}\) the measured sensor stack voltages. \(\bm{T}\) is . \(\bm{K}_{\tiny IFF}\) is the Low Authority Controller used for active damping. \(\bm{K}_{\mathcal{L}}\) is the High Authority Controller.}
|
||||
\caption{\label{fig:nass_hac_lac_schematic_test}HAC-LAC Strategy - Block Diagram. The signals are: \(\bm{r}\) the wanted sample's position, \(\bm{X}\) the measured sample's position, \(\bm{\epsilon}_{\mathcal{X}}\) the sample's position error, \(\bm{\epsilon}_{\mathcal{L}}\) the sample position error expressed in the ``frame'' of the nano-hexapod struts, \(\bm{u}\) the generated DAC voltages applied to the voltage amplifiers and then to the piezoelectric actuator stacks, \(\bm{u}^\prime\) the new inputs corresponding to the damped plant, \(\bm{\tau}\) the measured sensor stack voltages. \(\bm{T}\) is . \(\bm{K}_{\tiny IFF}\) is the Low Authority Controller used for active damping. \(\bm{K}_{L}\) is the High Authority Controller.}
|
||||
\end{figure}
|
||||
|
||||
|
||||
@ -147,12 +213,10 @@ See \cite{dehaeze18_sampl_stabil_for_tomog_exper}.
|
||||
\end{figure}
|
||||
|
||||
\section{CONCLUSION}
|
||||
\label{sec:orgce60d85}
|
||||
|
||||
\section{ACKNOWLEDGMENTS}
|
||||
\label{sec:orgfea2444}
|
||||
This research was made possible by a grant from the FRIA.
|
||||
We thank the following people for their support, without whose help this work would never have been possible: V. Honkimaki, L. Ducotte and M. Lessourd and the whole team of the Precision Mechatronic Laboratory.
|
||||
|
||||
\printbibliography
|
||||
\printbibliography{}
|
||||
\end{document}
|
||||
|
||||
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@ -12,7 +12,7 @@
|
||||
address = {Geneva, Switzerland},
|
||||
isbn = {978-3-95450-207-3},
|
||||
language = {english},
|
||||
month = {Dec},
|
||||
month = 12,
|
||||
publisher = {JACoW Publishing},
|
||||
series = {Mechanical Engineering Design of Synchrotron Radiation
|
||||
Equipment and Instrumentation},
|
||||
@ -33,16 +33,15 @@
|
||||
}
|
||||
|
||||
@article{souleille18_concep_activ_mount_space_applic,
|
||||
author = {Souleille, Adrien and Lampert, Thibault and Lafarga, V and
|
||||
author = {Souleille, Adrien and Lampert, Thibault and Lafarga, V and
|
||||
Hellegouarch, Sylvain and Rondineau, Alan and Rodrigues,
|
||||
Gon{\c{c}}alo and Collette, Christophe},
|
||||
title = {A Concept of Active Mount for Space Applications},
|
||||
journal = {CEAS Space Journal},
|
||||
volume = 10,
|
||||
number = 2,
|
||||
pages = {157--165},
|
||||
year = 2018,
|
||||
publisher = {Springer}
|
||||
title = {A Concept of Active Mount for Space Applications},
|
||||
journal = {CEAS Space Journal},
|
||||
volume = 10,
|
||||
number = 2,
|
||||
pages = {157--165},
|
||||
year = 2018,
|
||||
}
|
||||
|
||||
@article{dehaeze21_activ_dampin_rotat_platf_using,
|
||||
@ -53,7 +52,7 @@
|
||||
year = 2021,
|
||||
doi = {10.1088/2631-8695/abe803},
|
||||
url = {https://doi.org/10.1088/2631-8695/abe803},
|
||||
month = {Feb},
|
||||
month = {2},
|
||||
}
|
||||
|
||||
@phdthesis{rankers98_machin,
|
||||
|
||||
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