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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head> <head>
<!-- 2020-03-11 mer. 19:00 --> <!-- 2020-03-11 mer. 19:01 -->
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" /> <meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Stewart Platform - Tracking Control</title> <title>Stewart Platform - Tracking Control</title>
@ -248,42 +248,42 @@
<ul> <ul>
<li><a href="#orgd7b25e5">1. Decentralized Control Architecture using Strut Length</a> <li><a href="#orgd7b25e5">1. Decentralized Control Architecture using Strut Length</a>
<ul> <ul>
<li><a href="#org49467e8">1.1. Control Schematic</a></li> <li><a href="#orgf22ae1f">1.1. Control Schematic</a></li>
<li><a href="#org67db718">1.2. Initialize the Stewart platform</a></li> <li><a href="#orgfbc962f">1.2. Initialize the Stewart platform</a></li>
<li><a href="#org641cba6">1.3. Identification of the plant</a></li> <li><a href="#org5b50e6c">1.3. Identification of the plant</a></li>
<li><a href="#orgd9d7b44">1.4. Plant Analysis</a></li> <li><a href="#org127af6e">1.4. Plant Analysis</a></li>
<li><a href="#orgfaf80fa">1.5. Controller Design</a></li> <li><a href="#org64fe247">1.5. Controller Design</a></li>
<li><a href="#org8c10905">1.6. Simulation</a></li> <li><a href="#org30afd72">1.6. Simulation</a></li>
<li><a href="#org974b430">1.7. Results</a></li> <li><a href="#org974b430">1.7. Results</a></li>
<li><a href="#org2c54a80">1.8. Conclusion</a></li> <li><a href="#orge3e2e02">1.8. Conclusion</a></li>
</ul> </ul>
</li> </li>
<li><a href="#orga519721">2. Centralized Control Architecture using Pose Measurement</a> <li><a href="#orga519721">2. Centralized Control Architecture using Pose Measurement</a>
<ul> <ul>
<li><a href="#org54419d3">2.1. Control Schematic</a></li> <li><a href="#org3846e3e">2.1. Control Schematic</a></li>
<li><a href="#orgfbc962f">2.2. Initialize the Stewart platform</a></li> <li><a href="#orga001fab">2.2. Initialize the Stewart platform</a></li>
<li><a href="#org5b50e6c">2.3. Identification of the plant</a></li> <li><a href="#orgdff5afa">2.3. Identification of the plant</a></li>
<li><a href="#org2223469">2.4. Diagonal Control - Leg&rsquo;s Frame</a> <li><a href="#org2223469">2.4. Diagonal Control - Leg&rsquo;s Frame</a>
<ul> <ul>
<li><a href="#org8ff61f7">2.4.1. Control Architecture</a></li> <li><a href="#org224a0bb">2.4.1. Control Architecture</a></li>
<li><a href="#org7d457dc">2.4.2. Plant Analysis</a></li> <li><a href="#org7cd17a1">2.4.2. Plant Analysis</a></li>
<li><a href="#orge101512">2.4.3. Controller Design</a></li> <li><a href="#orgfe68d27">2.4.3. Controller Design</a></li>
<li><a href="#orgb422b25">2.4.4. Simulation</a></li> <li><a href="#org2481134">2.4.4. Simulation</a></li>
</ul> </ul>
</li> </li>
<li><a href="#org26a8857">2.5. Diagonal Control - Cartesian Frame</a> <li><a href="#org26a8857">2.5. Diagonal Control - Cartesian Frame</a>
<ul> <ul>
<li><a href="#orgcad4c0f">2.5.1. Control Architecture</a></li> <li><a href="#org0831ba6">2.5.1. Control Architecture</a></li>
<li><a href="#orga0f64cf">2.5.2. Plant Analysis</a></li> <li><a href="#orga750816">2.5.2. Plant Analysis</a></li>
<li><a href="#orgc665ea1">2.5.3. Controller Design</a></li> <li><a href="#org925664d">2.5.3. Controller Design</a></li>
<li><a href="#org30afd72">2.5.4. Simulation</a></li> <li><a href="#org42d3b74">2.5.4. Simulation</a></li>
</ul> </ul>
</li> </li>
<li><a href="#orgad7bc54">2.6. Diagonal Control - Steady State Decoupling</a> <li><a href="#orgad7bc54">2.6. Diagonal Control - Steady State Decoupling</a>
<ul> <ul>
<li><a href="#org224a0bb">2.6.1. Control Architecture</a></li> <li><a href="#org51231d3">2.6.1. Control Architecture</a></li>
<li><a href="#org127af6e">2.6.2. Plant Analysis</a></li> <li><a href="#org0328e3c">2.6.2. Plant Analysis</a></li>
<li><a href="#org64fe247">2.6.3. Controller Design</a></li> <li><a href="#orge8a14d5">2.6.3. Controller Design</a></li>
</ul> </ul>
</li> </li>
<li><a href="#orga2eadeb">2.7. Comparison</a> <li><a href="#orga2eadeb">2.7. Comparison</a>
@ -292,12 +292,12 @@
<li><a href="#org23ae479">2.7.2. Simulation Results</a></li> <li><a href="#org23ae479">2.7.2. Simulation Results</a></li>
</ul> </ul>
</li> </li>
<li><a href="#orge3e2e02">2.8. Conclusion</a></li> <li><a href="#org94c3e48">2.8. Conclusion</a></li>
</ul> </ul>
</li> </li>
<li><a href="#org4b8c360">3. Hybrid Control Architecture - HAC-LAC with relative DVF</a> <li><a href="#org4b8c360">3. Hybrid Control Architecture - HAC-LAC with relative DVF</a>
<ul> <ul>
<li><a href="#orgf22ae1f">3.1. Control Schematic</a></li> <li><a href="#org2183826">3.1. Control Schematic</a></li>
</ul> </ul>
</li> </li>
<li><a href="#org445f7a9">4. Position Error computation</a></li> <li><a href="#org445f7a9">4. Position Error computation</a></li>
@ -325,8 +325,8 @@ Depending of the measured quantity, different control architectures can be used:
<a id="orgea7df6c"></a> <a id="orgea7df6c"></a>
</p> </p>
</div> </div>
<div id="outline-container-org49467e8" class="outline-3"> <div id="outline-container-orgf22ae1f" class="outline-3">
<h3 id="org49467e8"><span class="section-number-3">1.1</span> Control Schematic</h3> <h3 id="orgf22ae1f"><span class="section-number-3">1.1</span> Control Schematic</h3>
<div class="outline-text-3" id="text-1-1"> <div class="outline-text-3" id="text-1-1">
<p> <p>
The control architecture is shown in Figure <a href="#org4f704a1">1</a>. The control architecture is shown in Figure <a href="#org4f704a1">1</a>.
@ -349,8 +349,8 @@ Then, a diagonal (decentralized) controller \(\bm{K}_\mathcal{L}\) is used such
</div> </div>
</div> </div>
<div id="outline-container-org67db718" class="outline-3"> <div id="outline-container-orgfbc962f" class="outline-3">
<h3 id="org67db718"><span class="section-number-3">1.2</span> Initialize the Stewart platform</h3> <h3 id="orgfbc962f"><span class="section-number-3">1.2</span> Initialize the Stewart platform</h3>
<div class="outline-text-3" id="text-1-2"> <div class="outline-text-3" id="text-1-2">
<div class="org-src-container"> <div class="org-src-container">
<pre class="src src-matlab">stewart = initializeStewartPlatform(); <pre class="src src-matlab">stewart = initializeStewartPlatform();
@ -382,8 +382,8 @@ references = initializeReferences(stewart);
</div> </div>
</div> </div>
<div id="outline-container-org641cba6" class="outline-3"> <div id="outline-container-org5b50e6c" class="outline-3">
<h3 id="org641cba6"><span class="section-number-3">1.3</span> Identification of the plant</h3> <h3 id="org5b50e6c"><span class="section-number-3">1.3</span> Identification of the plant</h3>
<div class="outline-text-3" id="text-1-3"> <div class="outline-text-3" id="text-1-3">
<p> <p>
Let&rsquo;s identify the transfer function from \(\bm{\tau}\) to \(\bm{L}\). Let&rsquo;s identify the transfer function from \(\bm{\tau}\) to \(\bm{L}\).
@ -406,8 +406,8 @@ G.OutputName = {<span class="org-string">'L1'</span>, <span class="org-string">'
</div> </div>
</div> </div>
<div id="outline-container-orgd9d7b44" class="outline-3"> <div id="outline-container-org127af6e" class="outline-3">
<h3 id="orgd9d7b44"><span class="section-number-3">1.4</span> Plant Analysis</h3> <h3 id="org127af6e"><span class="section-number-3">1.4</span> Plant Analysis</h3>
<div class="outline-text-3" id="text-1-4"> <div class="outline-text-3" id="text-1-4">
<p> <p>
The diagonal terms of the plant is shown in Figure <a href="#org8c82316">2</a>. The diagonal terms of the plant is shown in Figure <a href="#org8c82316">2</a>.
@ -441,8 +441,8 @@ We see that the plant is decoupled at low frequency which indicate that decentra
</div> </div>
</div> </div>
<div id="outline-container-orgfaf80fa" class="outline-3"> <div id="outline-container-org64fe247" class="outline-3">
<h3 id="orgfaf80fa"><span class="section-number-3">1.5</span> Controller Design</h3> <h3 id="org64fe247"><span class="section-number-3">1.5</span> Controller Design</h3>
<div class="outline-text-3" id="text-1-5"> <div class="outline-text-3" id="text-1-5">
<p> <p>
The controller consists of: The controller consists of:
@ -472,8 +472,8 @@ Kl = diag(1<span class="org-type">./</span>diag(abs(freqresp(G, wc)))) <span cla
</div> </div>
</div> </div>
<div id="outline-container-org8c10905" class="outline-3"> <div id="outline-container-org30afd72" class="outline-3">
<h3 id="org8c10905"><span class="section-number-3">1.6</span> Simulation</h3> <h3 id="org30afd72"><span class="section-number-3">1.6</span> Simulation</h3>
<div class="outline-text-3" id="text-1-6"> <div class="outline-text-3" id="text-1-6">
<div class="org-src-container"> <div class="org-src-container">
<pre class="src src-matlab">t = linspace(0, 10, 1000); <pre class="src src-matlab">t = linspace(0, 10, 1000);
@ -518,8 +518,8 @@ simout_D = simout;
</div> </div>
</div> </div>
<div id="outline-container-org2c54a80" class="outline-3"> <div id="outline-container-orge3e2e02" class="outline-3">
<h3 id="org2c54a80"><span class="section-number-3">1.8</span> Conclusion</h3> <h3 id="orge3e2e02"><span class="section-number-3">1.8</span> Conclusion</h3>
<div class="outline-text-3" id="text-1-8"> <div class="outline-text-3" id="text-1-8">
<p> <p>
Such control architecture is easy to implement and give good results. Such control architecture is easy to implement and give good results.
@ -540,8 +540,8 @@ However, as \(\mathcal{X}\) is not directly measured, it is possible that import
<a id="org48604d1"></a> <a id="org48604d1"></a>
</p> </p>
</div> </div>
<div id="outline-container-org54419d3" class="outline-3"> <div id="outline-container-org3846e3e" class="outline-3">
<h3 id="org54419d3"><span class="section-number-3">2.1</span> Control Schematic</h3> <h3 id="org3846e3e"><span class="section-number-3">2.1</span> Control Schematic</h3>
<div class="outline-text-3" id="text-2-1"> <div class="outline-text-3" id="text-2-1">
<p> <p>
The centralized controller takes the position error \(\bm{\epsilon}_\mathcal{X}\) as an inputs and generate actuator forces \(\bm{\tau}\) (see Figure <a href="#org97ec686">7</a>). The centralized controller takes the position error \(\bm{\epsilon}_\mathcal{X}\) as an inputs and generate actuator forces \(\bm{\tau}\) (see Figure <a href="#org97ec686">7</a>).
@ -551,7 +551,7 @@ The signals are:
<li>reference path \(\bm{r}_\mathcal{X} = \begin{bmatrix} \epsilon_x & \epsilon_y & \epsilon_z & \epsilon_{R_x} & \epsilon_{R_y} & \epsilon_{R_z} \end{bmatrix}\)</li> <li>reference path \(\bm{r}_\mathcal{X} = \begin{bmatrix} \epsilon_x & \epsilon_y & \epsilon_z & \epsilon_{R_x} & \epsilon_{R_y} & \epsilon_{R_z} \end{bmatrix}\)</li>
<li>tracking error \(\bm{\epsilon}_\mathcal{X} = \begin{bmatrix} \epsilon_x & \epsilon_y & \epsilon_z & \epsilon_{R_x} & \epsilon_{R_y} & \epsilon_{R_z} \end{bmatrix}\)</li> <li>tracking error \(\bm{\epsilon}_\mathcal{X} = \begin{bmatrix} \epsilon_x & \epsilon_y & \epsilon_z & \epsilon_{R_x} & \epsilon_{R_y} & \epsilon_{R_z} \end{bmatrix}\)</li>
<li>actuator forces \(\bm{\tau} = \begin{bmatrix} \tau_1 & \tau_2 & \tau_3 & \tau_4 & \tau_5 & \tau_6 \end{bmatrix}\)</li> <li>actuator forces \(\bm{\tau} = \begin{bmatrix} \tau_1 & \tau_2 & \tau_3 & \tau_4 & \tau_5 & \tau_6 \end{bmatrix}\)</li>
<li>payload pose \(\bm{\mathcal{X}) = \begin{bmatrix} x & y & z & R_x & R_y & R_z \end{bmatrix}\)</li> <li>payload pose \(\bm{\mathcal{X}} = \begin{bmatrix} x & y & z & R_x & R_y & R_z \end{bmatrix}\)</li>
</ul> </ul>
@ -579,8 +579,8 @@ It is indeed a more complex computation explained in section <a href="#org5f6154
</div> </div>
</div> </div>
<div id="outline-container-orgfbc962f" class="outline-3"> <div id="outline-container-orga001fab" class="outline-3">
<h3 id="orgfbc962f"><span class="section-number-3">2.2</span> Initialize the Stewart platform</h3> <h3 id="orga001fab"><span class="section-number-3">2.2</span> Initialize the Stewart platform</h3>
<div class="outline-text-3" id="text-2-2"> <div class="outline-text-3" id="text-2-2">
<div class="org-src-container"> <div class="org-src-container">
<pre class="src src-matlab">stewart = initializeStewartPlatform(); <pre class="src src-matlab">stewart = initializeStewartPlatform();
@ -612,8 +612,8 @@ references = initializeReferences(stewart);
</div> </div>
</div> </div>
<div id="outline-container-org5b50e6c" class="outline-3"> <div id="outline-container-orgdff5afa" class="outline-3">
<h3 id="org5b50e6c"><span class="section-number-3">2.3</span> Identification of the plant</h3> <h3 id="orgdff5afa"><span class="section-number-3">2.3</span> Identification of the plant</h3>
<div class="outline-text-3" id="text-2-3"> <div class="outline-text-3" id="text-2-3">
<p> <p>
Let&rsquo;s identify the transfer function from \(\bm{\tau}\) to \(\bm{L}\). Let&rsquo;s identify the transfer function from \(\bm{\tau}\) to \(\bm{L}\).
@ -643,8 +643,8 @@ G.OutputName = {<span class="org-string">'Dx'</span>, <span class="org-string">'
<a id="org31fd942"></a> <a id="org31fd942"></a>
</p> </p>
</div> </div>
<div id="outline-container-org8ff61f7" class="outline-4"> <div id="outline-container-org224a0bb" class="outline-4">
<h4 id="org8ff61f7"><span class="section-number-4">2.4.1</span> Control Architecture</h4> <h4 id="org224a0bb"><span class="section-number-4">2.4.1</span> Control Architecture</h4>
<div class="outline-text-4" id="text-2-4-1"> <div class="outline-text-4" id="text-2-4-1">
<p> <p>
The pose error \(\bm{\epsilon}_\mathcal{X}\) is first converted in the frame of the leg by using the Jacobian matrix. The pose error \(\bm{\epsilon}_\mathcal{X}\) is first converted in the frame of the leg by using the Jacobian matrix.
@ -665,8 +665,8 @@ Note here that the transformation from the pose error \(\bm{\epsilon}_\mathcal{X
</div> </div>
</div> </div>
<div id="outline-container-org7d457dc" class="outline-4"> <div id="outline-container-org7cd17a1" class="outline-4">
<h4 id="org7d457dc"><span class="section-number-4">2.4.2</span> Plant Analysis</h4> <h4 id="org7cd17a1"><span class="section-number-4">2.4.2</span> Plant Analysis</h4>
<div class="outline-text-4" id="text-2-4-2"> <div class="outline-text-4" id="text-2-4-2">
<p> <p>
We now multiply the plant by the Jacobian matrix as shown in Figure <a href="#orgb1f5ad2">8</a> to obtain a more diagonal plant. We now multiply the plant by the Jacobian matrix as shown in Figure <a href="#orgb1f5ad2">8</a> to obtain a more diagonal plant.
@ -716,8 +716,8 @@ Thus \(J \cdot G(\omega = 0) = J \cdot \frac{\delta\bm{\mathcal{X}}}{\delta\bm{\
</div> </div>
</div> </div>
<div id="outline-container-orge101512" class="outline-4"> <div id="outline-container-orgfe68d27" class="outline-4">
<h4 id="orge101512"><span class="section-number-4">2.4.3</span> Controller Design</h4> <h4 id="orgfe68d27"><span class="section-number-4">2.4.3</span> Controller Design</h4>
<div class="outline-text-4" id="text-2-4-3"> <div class="outline-text-4" id="text-2-4-3">
<p> <p>
The controller consists of: The controller consists of:
@ -755,8 +755,8 @@ The controller \(\bm{K} = \bm{K}_\mathcal{L} \bm{J}\) is computed.
</div> </div>
</div> </div>
<div id="outline-container-orgb422b25" class="outline-4"> <div id="outline-container-org2481134" class="outline-4">
<h4 id="orgb422b25"><span class="section-number-4">2.4.4</span> Simulation</h4> <h4 id="org2481134"><span class="section-number-4">2.4.4</span> Simulation</h4>
<div class="outline-text-4" id="text-2-4-4"> <div class="outline-text-4" id="text-2-4-4">
<p> <p>
We specify the reference path to follow. We specify the reference path to follow.
@ -796,8 +796,8 @@ simout_L = simout;
<a id="orgfd201c3"></a> <a id="orgfd201c3"></a>
</p> </p>
</div> </div>
<div id="outline-container-orgcad4c0f" class="outline-4"> <div id="outline-container-org0831ba6" class="outline-4">
<h4 id="orgcad4c0f"><span class="section-number-4">2.5.1</span> Control Architecture</h4> <h4 id="org0831ba6"><span class="section-number-4">2.5.1</span> Control Architecture</h4>
<div class="outline-text-4" id="text-2-5-1"> <div class="outline-text-4" id="text-2-5-1">
<p> <p>
A diagonal controller \(\bm{K}_\mathcal{X}\) take the pose error \(\bm{\epsilon}_\mathcal{X}\) and generate cartesian forces \(\bm{\mathcal{F}}\) that are then converted to actuators forces using the Jacobian as shown in Figure e <a href="#org6b158db">12</a>. A diagonal controller \(\bm{K}_\mathcal{X}\) take the pose error \(\bm{\epsilon}_\mathcal{X}\) and generate cartesian forces \(\bm{\mathcal{F}}\) that are then converted to actuators forces using the Jacobian as shown in Figure e <a href="#org6b158db">12</a>.
@ -816,8 +816,8 @@ The final implemented controller is \(\bm{K} = \bm{J}^{-T} \cdot \bm{K}_\mathcal
</div> </div>
</div> </div>
<div id="outline-container-orga0f64cf" class="outline-4"> <div id="outline-container-orga750816" class="outline-4">
<h4 id="orga0f64cf"><span class="section-number-4">2.5.2</span> Plant Analysis</h4> <h4 id="orga750816"><span class="section-number-4">2.5.2</span> Plant Analysis</h4>
<div class="outline-text-4" id="text-2-5-2"> <div class="outline-text-4" id="text-2-5-2">
<p> <p>
We now multiply the plant by the Jacobian matrix as shown in Figure <a href="#org6b158db">12</a> to obtain a more diagonal plant. We now multiply the plant by the Jacobian matrix as shown in Figure <a href="#org6b158db">12</a> to obtain a more diagonal plant.
@ -939,8 +939,8 @@ This control architecture can also give a dynamically decoupled plant if the Cen
</div> </div>
</div> </div>
<div id="outline-container-orgc665ea1" class="outline-4"> <div id="outline-container-org925664d" class="outline-4">
<h4 id="orgc665ea1"><span class="section-number-4">2.5.3</span> Controller Design</h4> <h4 id="org925664d"><span class="section-number-4">2.5.3</span> Controller Design</h4>
<div class="outline-text-4" id="text-2-5-3"> <div class="outline-text-4" id="text-2-5-3">
<p> <p>
The controller consists of: The controller consists of:
@ -978,8 +978,8 @@ The controller \(\bm{K} = \bm{J}^{-T} \bm{K}_\mathcal{X}\) is computed.
</div> </div>
</div> </div>
<div id="outline-container-org30afd72" class="outline-4"> <div id="outline-container-org42d3b74" class="outline-4">
<h4 id="org30afd72"><span class="section-number-4">2.5.4</span> Simulation</h4> <h4 id="org42d3b74"><span class="section-number-4">2.5.4</span> Simulation</h4>
<div class="outline-text-4" id="text-2-5-4"> <div class="outline-text-4" id="text-2-5-4">
<p> <p>
We specify the reference path to follow. We specify the reference path to follow.
@ -1019,8 +1019,8 @@ simout_X = simout;
<a id="org789ba4a"></a> <a id="org789ba4a"></a>
</p> </p>
</div> </div>
<div id="outline-container-org224a0bb" class="outline-4"> <div id="outline-container-org51231d3" class="outline-4">
<h4 id="org224a0bb"><span class="section-number-4">2.6.1</span> Control Architecture</h4> <h4 id="org51231d3"><span class="section-number-4">2.6.1</span> Control Architecture</h4>
<div class="outline-text-4" id="text-2-6-1"> <div class="outline-text-4" id="text-2-6-1">
<p> <p>
The plant \(\bm{G}\) is pre-multiply by \(\bm{G}^{-1}(\omega = 0)\) such that the &ldquo;shaped plant&rdquo; \(\bm{G}_0 = \bm{G} \bm{G}^{-1}(\omega = 0)\) is diagonal at low frequency. The plant \(\bm{G}\) is pre-multiply by \(\bm{G}^{-1}(\omega = 0)\) such that the &ldquo;shaped plant&rdquo; \(\bm{G}_0 = \bm{G} \bm{G}^{-1}(\omega = 0)\) is diagonal at low frequency.
@ -1043,8 +1043,8 @@ The control architecture is shown in Figure <a href="#orgb226e44">16</a>.
</div> </div>
</div> </div>
<div id="outline-container-org127af6e" class="outline-4"> <div id="outline-container-org0328e3c" class="outline-4">
<h4 id="org127af6e"><span class="section-number-4">2.6.2</span> Plant Analysis</h4> <h4 id="org0328e3c"><span class="section-number-4">2.6.2</span> Plant Analysis</h4>
<div class="outline-text-4" id="text-2-6-2"> <div class="outline-text-4" id="text-2-6-2">
<p> <p>
The plant is pre-multiplied by \(\bm{G}^{-1}(\omega = 0)\). The plant is pre-multiplied by \(\bm{G}^{-1}(\omega = 0)\).
@ -1072,8 +1072,8 @@ The diagonal elements of the shaped plant are shown in Figure <a href="#orgc15aa
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<div id="outline-container-org64fe247" class="outline-4"> <div id="outline-container-orge8a14d5" class="outline-4">
<h4 id="org64fe247"><span class="section-number-4">2.6.3</span> Controller Design</h4> <h4 id="orge8a14d5"><span class="section-number-4">2.6.3</span> Controller Design</h4>
<div class="outline-text-4" id="text-2-6-3"> <div class="outline-text-4" id="text-2-6-3">
<p> <p>
We have that: We have that:
@ -1147,8 +1147,8 @@ This error is much lower when using the diagonal control in the frame of the leg
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<div id="outline-container-orge3e2e02" class="outline-3"> <div id="outline-container-org94c3e48" class="outline-3">
<h3 id="orge3e2e02"><span class="section-number-3">2.8</span> Conclusion</h3> <h3 id="org94c3e48"><span class="section-number-3">2.8</span> Conclusion</h3>
<div class="outline-text-3" id="text-2-8"> <div class="outline-text-3" id="text-2-8">
<p> <p>
Both control architecture gives similar results even tough the control in the Leg&rsquo;s frame gives slightly better results. Both control architecture gives similar results even tough the control in the Leg&rsquo;s frame gives slightly better results.
@ -1231,8 +1231,8 @@ Thus, this method should be quite robust against parameter variation (e.g. the p
<a id="org14e3e5f"></a> <a id="org14e3e5f"></a>
</p> </p>
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<div id="outline-container-orgf22ae1f" class="outline-3"> <div id="outline-container-org2183826" class="outline-3">
<h3 id="orgf22ae1f"><span class="section-number-3">3.1</span> Control Schematic</h3> <h3 id="org2183826"><span class="section-number-3">3.1</span> Control Schematic</h3>
<div class="outline-text-3" id="text-3-1"> <div class="outline-text-3" id="text-3-1">
<div id="org3a1b1db" class="figure"> <div id="org3a1b1db" class="figure">
@ -1359,7 +1359,7 @@ Erz = atan2(<span class="org-type">-</span>T(1, 2)<span class="org-type">/</span
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<div id="postamble" class="status"> <div id="postamble" class="status">
<p class="author">Author: Dehaeze Thomas</p> <p class="author">Author: Dehaeze Thomas</p>
<p class="date">Created: 2020-03-11 mer. 19:00</p> <p class="date">Created: 2020-03-11 mer. 19:01</p>
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@ -434,7 +434,7 @@ The signals are:
- reference path $\bm{r}_\mathcal{X} = \begin{bmatrix} \epsilon_x & \epsilon_y & \epsilon_z & \epsilon_{R_x} & \epsilon_{R_y} & \epsilon_{R_z} \end{bmatrix}$ - reference path $\bm{r}_\mathcal{X} = \begin{bmatrix} \epsilon_x & \epsilon_y & \epsilon_z & \epsilon_{R_x} & \epsilon_{R_y} & \epsilon_{R_z} \end{bmatrix}$
- tracking error $\bm{\epsilon}_\mathcal{X} = \begin{bmatrix} \epsilon_x & \epsilon_y & \epsilon_z & \epsilon_{R_x} & \epsilon_{R_y} & \epsilon_{R_z} \end{bmatrix}$ - tracking error $\bm{\epsilon}_\mathcal{X} = \begin{bmatrix} \epsilon_x & \epsilon_y & \epsilon_z & \epsilon_{R_x} & \epsilon_{R_y} & \epsilon_{R_z} \end{bmatrix}$
- actuator forces $\bm{\tau} = \begin{bmatrix} \tau_1 & \tau_2 & \tau_3 & \tau_4 & \tau_5 & \tau_6 \end{bmatrix}$ - actuator forces $\bm{\tau} = \begin{bmatrix} \tau_1 & \tau_2 & \tau_3 & \tau_4 & \tau_5 & \tau_6 \end{bmatrix}$
- payload pose $\bm{\mathcal{X}) = \begin{bmatrix} x & y & z & R_x & R_y & R_z \end{bmatrix}$ - payload pose $\bm{\mathcal{X}} = \begin{bmatrix} x & y & z & R_x & R_y & R_z \end{bmatrix}$
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