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@@ -35,9 +35,7 @@ Tags
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| ID16a | ESRF | Piezo (PI) |
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## Built Stewart PLatforms {#built-stewart-platforms}
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<span class="org-target" id="org-target--sec-built"></span>
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## Built Stewart PLatforms {#sec:built}
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**Actuators**:
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@@ -58,9 +56,7 @@ Tags
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- External Metrology
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### Short Stroke {#short-stroke}
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<span class="org-target" id="org-target--sec-built-short-stroke"></span>
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### Short Stroke {#sec:built_short_stroke}
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| University | Figure | Configuration | Joints | Actuators | Sensors | Application | Link to bibliography |
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|----------------|---------------------------------------------|-------------------|-------------|--------------------------|------------------------------------------------------------|------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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@@ -171,9 +167,7 @@ Tags
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{{< figure src="/ox-hugo/stewart_ulb_vc.jpg" caption="<span class='figure-number'>Figure 21: </span>ULB - Voice Coil <&hanieh03_activ_stewar>" >}}
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### Long Stroke {#long-stroke}
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<span class="org-target" id="org-target--sec-built-long-stroke"></span>
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### Long Stroke {#sec:built_long_stroke}
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| University | Figure | Configuration | Joints | Actuators | Sensors | Link to bibliography |
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|----------------|------------------------------------------|---------------|--------------|-------------------------|--------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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@@ -199,20 +193,16 @@ Tags
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{{< figure src="/ox-hugo/stewart_czech.jpg" caption="<span class='figure-number'>Figure 25: </span>Stewart platform from Brno University (Czech) <&brezina08_ni_labview_matlab_simmec_stewar_platf_desig>" >}}
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## Articles - Design Related {#articles-design-related}
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## Articles - Design Related {#sec:design}
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<span class="org-target" id="org-target--sec-design"></span>
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- Flexible joints (Section )
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- Specific geometry to have good decoupling properties (Section )
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- Alternative architectures for 6DoF parallel mechanisms (Section )
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- Workspace (Section )
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- Modelling (Section )
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- Flexible joints (Section [Flexures](#sec:design_flexure))
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- Specific geometry to have good decoupling properties (Section [Decoupling](#sec:design_decoupling))
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- Alternative architectures for 6DoF parallel mechanisms (Section [Alternative Architectures](#sec:design_architecture))
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- Workspace (Section [Workspace](#sec:design_workspace))
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- Modelling (Section [Modelling](#sec:design_modelling))
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### Flexures {#flexures}
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<span class="org-target" id="org-target--sec-design-flexure"></span>
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### Flexures {#sec:design_flexure}
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From (<a href="#citeproc_bib_item_31">Hauge and Campbell 2004</a>):
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@@ -223,9 +213,7 @@ From (<a href="#citeproc_bib_item_31">Hauge and Campbell 2004</a>):
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| Effect of flexures | (<a href="#citeproc_bib_item_46">McInroy 2002</a>) |
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### Decoupling {#decoupling}
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<span class="org-target" id="org-target--sec-design-decoupling"></span>
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### Decoupling {#sec:design_decoupling}
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| Main Object | Link to bibliography |
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|------------------------------------|---------------------------------------------------------------|
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@@ -233,9 +221,7 @@ From (<a href="#citeproc_bib_item_31">Hauge and Campbell 2004</a>):
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| | (<a href="#citeproc_bib_item_4">Afzali-Far 2016</a>) |
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### Alternative Architectures {#alternative-architectures}
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<span class="org-target" id="org-target--sec-design-architecture"></span>
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### Alternative Architectures {#sec:design_architecture}
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| Figure | Link to bibliography |
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|------------------------------------------|----------------------------------------------------------------------------------------------------------------------------|
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@@ -250,9 +236,7 @@ From (<a href="#citeproc_bib_item_31">Hauge and Campbell 2004</a>):
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{{< figure src="/ox-hugo/stewart_dong07.jpg" caption="<span class='figure-number'>Figure 26: </span><&dong07_desig_precis_compl_paral_posit>" >}}
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### Workspace {#workspace}
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<span class="org-target" id="org-target--sec-design-workspace"></span>
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### Workspace {#sec:design_workspace}
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| Main Object | Link to bibliography |
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|------------------------------------------------------|----------------------------------------------------------------|
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@@ -262,9 +246,7 @@ From (<a href="#citeproc_bib_item_31">Hauge and Campbell 2004</a>):
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| Orientation Workspace | (<a href="#citeproc_bib_item_37">Jiang and Gosselin 2009b</a>) |
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### Modelling {#modelling}
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<span class="org-target" id="org-target--sec-design-modelling"></span>
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### Modelling {#sec:design_modelling}
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#### Multi Body {#multi-body}
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@@ -276,25 +258,21 @@ From (<a href="#citeproc_bib_item_31">Hauge and Campbell 2004</a>):
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#### Lumped {#lumped}
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## Control {#control}
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<span class="org-target" id="org-target--sec-control"></span>
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## Control {#sec:control}
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Different control objectives:
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- Vibration Control (Section )
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- Position Control (Section )
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- Vibration Control (Section [Vibration Control and Active Damping](#sec:control_isolation))
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- Position Control (Section [Position Control](#sec:control_position))
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Sometimes, the two objectives are simultaneous, in that case multiple sensors needs to be combined in the control architecture (Section ).
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Sometimes, the two objectives are simultaneous, in that case multiple sensors needs to be combined in the control architecture (Section [Multi Sensor Control](#sec:control_multi_sensor)).
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Stewart platform, being 6DoF parallel mechanisms, have a coupled dynamics.
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In order to ease the control design, decoupling is generally required.
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Several approaches can be used (Section ).
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### Vibration Control and Active Damping {#vibration-control-and-active-damping}
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<span class="org-target" id="org-target--sec-control-isolation"></span>
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### Vibration Control and Active Damping {#sec:control_isolation}
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From (<a href="#citeproc_bib_item_31">Hauge and Campbell 2004</a>):
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@@ -348,9 +326,7 @@ From (<a href="#citeproc_bib_item_31">Hauge and Campbell 2004</a>):
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| Shangai | Piezoelectric | Force Sensor + Accelerometer | Vibration isolation, HAC-LAC (IFF + FxLMS) | Dynamic Model + Vibration Control | (<a href="#citeproc_bib_item_76">Wang et al. 2016</a>) |
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### Position Control {#position-control}
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<span class="org-target" id="org-target--sec-control-position"></span>
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### Position Control {#sec:control_position}
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Here, the objective is to _position_ the mobile platform with respect to an external metrology or internal metrology.
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@@ -380,9 +356,7 @@ From: (<a href="#citeproc_bib_item_80">Yang et al. 2019</a>):
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> The idea is to synthesize the control force that can compensate the parasitic bending and torsional torques of the flexible joints and simultaneously achieve diagonalization of the matrices M, C and K.
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### Multi Sensor Control {#multi-sensor-control}
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<span class="org-target" id="org-target--sec-control-multi-sensor"></span>
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### Multi Sensor Control {#sec:control_multi_sensor}
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Improvement by the use of several sensors:
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@@ -478,9 +452,7 @@ From (<a href="#citeproc_bib_item_68">Thayer et al. 2002</a>):
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| Harbin (China) | Voice Coil | Accelerometers | MIMO H-Infinity, active damping | (<a href="#citeproc_bib_item_38">Jiao et al. 2018</a>) |
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### Long Stroke Stewart Platforms {#long-stroke-stewart-platforms}
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<span class="org-target" id="org-target--sec-control-long-stroke"></span>
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### Long Stroke Stewart Platforms {#sec:control_long_stroke}
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| Link to bibliography | University | Actuators | Sensors | Control | Main Object |
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|-------------------------------------------------------------------------------------------------------------------------------------------------|----------------|------------------------|------------------|--------------------------------------------------|--------------------------------------------|
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