Add APA model + explain measurement procedure

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Thomas Dehaeze 2020-12-16 11:07:42 +01:00
parent 0a62e73978
commit 882486d8c6
5 changed files with 1161 additions and 21 deletions

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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<!-- 2020-12-15 mar. 23:33 -->
<!-- 2020-12-16 mer. 11:07 -->
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>Amplifier Piezoelectric Actuator APA300ML - Test Bench</title>
<meta name="generator" content="Org mode" />
@ -30,8 +30,18 @@
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#org35c5c6b">1. Model of an Amplified Piezoelectric Actuator and Sensor</a></li>
<li><a href="#org1e8593e">2. Test-Bench Description</a></li>
<li><a href="#org1313e99">1. Model of an Amplified Piezoelectric Actuator and Sensor</a></li>
<li><a href="#org3c114e3">2. Test-Bench Description</a></li>
<li><a href="#orgeef8a7b">3. Measurement Procedure</a>
<ul>
<li><a href="#orgf5f4de4">3.1. Stroke Measurement</a></li>
<li><a href="#orgc6a7f40">3.2. Stiffness Measurement</a></li>
<li><a href="#orgf924c27">3.3. Hysteresis measurement</a></li>
<li><a href="#org8dd84d4">3.4. Piezoelectric Actuator Constant</a></li>
<li><a href="#org133086b">3.5. Piezoelectric Sensor Constant</a></li>
<li><a href="#org6d5e309">3.6. Capacitance Measurement</a></li>
</ul>
</li>
</ul>
</div>
</div>
@ -47,24 +57,48 @@ This include:
<li>Stroke</li>
<li>Stiffness</li>
<li>Hysteresis</li>
<li>Gain from \(V_a\) to \(d\) (in [m/V]), then it should be possible to compute the gain from \(V_a\) to \(F_a\) using the Simscape model</li>
<li>Gain from \(\delta L\) to \(V_s\) (in [V/m])</li>
<li>Gain from the applied voltage \(V_a\) to the generated Force \(F_a\)</li>
<li>Gain from the sensor stack strain \(\delta L\) to the generated voltage \(V_s\)</li>
</ul>
<div id="outline-container-org35c5c6b" class="outline-2">
<h2 id="org35c5c6b"><span class="section-number-2">1</span> Model of an Amplified Piezoelectric Actuator and Sensor</h2>
<div id="outline-container-org1313e99" class="outline-2">
<h2 id="org1313e99"><span class="section-number-2">1</span> Model of an Amplified Piezoelectric Actuator and Sensor</h2>
<div class="outline-text-2" id="text-1">
<ul class="org-ul">
<li class="off"><code>[&#xa0;]</code> Schematic of the APA with values of displacement, voltages, forces, etc.</li>
<li class="off"><code>[&#xa0;]</code> Required things to measure</li>
</ul>
<p>
Consider a schematic of the Amplified Piezoelectric Actuator in Figure <a href="#org5dd279e">1</a>.
</p>
<p>
A voltage \(V_a\) applied to the actuator stacks will induce an actuator force \(F_a\):
</p>
\begin{equation}
F_a = g_a \cdot V_a
\end{equation}
<p>
A change of length \(dl\) of the sensor stack will induce a voltage \(V_s\):
</p>
\begin{equation}
V_s = g_s \cdot dl
\end{equation}
<p>
We wish here to experimental measure \(g_a\) and \(g_s\).
</p>
<div id="org5dd279e" class="figure">
<p><img src="figs/apa_model_schematic.png" alt="apa_model_schematic.png" />
</p>
<p><span class="figure-number">Figure 1: </span>Amplified Piezoelectric Actuator Schematic</p>
</div>
</div>
</div>
<div id="outline-container-org1e8593e" class="outline-2">
<h2 id="org1e8593e"><span class="section-number-2">2</span> Test-Bench Description</h2>
<div id="outline-container-org3c114e3" class="outline-2">
<h2 id="org3c114e3"><span class="section-number-2">2</span> Test-Bench Description</h2>
<div class="outline-text-2" id="text-2">
<div class="note" id="org5ab97da">
<div class="note" id="org84f08a9">
<p>
Here are the documentation of the equipment used for this test bench:
</p>
@ -79,17 +113,161 @@ Here are the documentation of the equipment used for this test bench:
</div>
<div id="org2908959" class="figure">
<div id="org9ba13fa" class="figure">
<p><img src="figs/test_bench_apa_alone.png" alt="test_bench_apa_alone.png" />
</p>
<p><span class="figure-number">Figure 1: </span>Schematic of the Test Bench</p>
<p><span class="figure-number">Figure 2: </span>Schematic of the Test Bench</p>
</div>
</div>
</div>
<div id="outline-container-orgeef8a7b" class="outline-2">
<h2 id="orgeef8a7b"><span class="section-number-2">3</span> Measurement Procedure</h2>
<div class="outline-text-2" id="text-3">
</div>
<div id="outline-container-orgf5f4de4" class="outline-3">
<h3 id="orgf5f4de4"><span class="section-number-3">3.1</span> Stroke Measurement</h3>
<div class="outline-text-3" id="text-3-1">
<p>
Using the PD200 amplifier, output a voltage:
\[ V_a = 65 + 85 \sin(2\pi \cdot t) \]
To have a quasi-static excitation between -80 and 150V.
</p>
<p>
As the gain of the PD200 amplifier is 20, the DAC output voltage should be:
\[ V_{dac}(t) = 3.25 + 4.25\sin(2\pi \cdot t) \]
</p>
<p>
Verify that the voltage offset is zero!
</p>
<p>
Measure the output vertical displacement \(d\) using the interferometer.
</p>
<p>
Then, plot \(d\) as a function of \(V_a\), and perform a linear regression.
Conclude on the obtained stroke.
</p>
</div>
</div>
<div id="outline-container-orgc6a7f40" class="outline-3">
<h3 id="orgc6a7f40"><span class="section-number-3">3.2</span> Stiffness Measurement</h3>
<div class="outline-text-3" id="text-3-2">
<p>
Add some (known) weight \(\delta m g\) on the suspended mass and measure the deflection \(\delta d\).
This can be tested when the piezoelectric stacks are open-circuit.
</p>
<p>
As the stiffness will be around \(k \approx 10^6 N/m\), an added mass of \(m \approx 100g\) will induce a static deflection of \(\approx 1\mu m\) which should be large enough for a precise measurement using the interferometer.
</p>
<p>
Then the obtained stiffness is:
</p>
\begin{equation}
k = \frac{\delta m g}{\delta d}
\end{equation}
</div>
</div>
<div id="outline-container-orgf924c27" class="outline-3">
<h3 id="orgf924c27"><span class="section-number-3">3.3</span> Hysteresis measurement</h3>
<div class="outline-text-3" id="text-3-3">
<p>
Supply a quasi static sinusoidal excitation \(V_a\) at different voltages.
</p>
<p>
The offset should be 65V, and the sin amplitude can range from 1V up to 85V.
</p>
<p>
For each excitation amplitude, the vertical displacement \(d\) of the mass is measured.
</p>
<p>
Then, \(d\) is plotted as a function of \(V_a\) for all the amplitudes.
</p>
</div>
</div>
<div id="outline-container-org8dd84d4" class="outline-3">
<h3 id="org8dd84d4"><span class="section-number-3">3.4</span> Piezoelectric Actuator Constant</h3>
<div class="outline-text-3" id="text-3-4">
<p>
Using the measurement test-bench, it is rather easy the determine the static gain between the applied voltage \(V_a\) to the induced displacement \(d\).
Use a quasi static (1Hz) excitation signal \(V_a\) on the piezoelectric stack and measure the vertical displacement \(d\).
Perform a linear regression to obtain:
</p>
\begin{equation}
d = g_{d/V_a} \cdot V_a
\end{equation}
<p>
Using the Simscape model of the APA, it is possible to determine the static gain between the actuator force \(F_a\) to the induced displacement \(d\):
</p>
\begin{equation}
d = g_{d/F_a} \cdot F_a
\end{equation}
<p>
From the two gains, it is then easy to determine \(g_a\):
</p>
\begin{equation}
g_a = \frac{F_a}{V_a} = \frac{F_a}{d} \cdot \frac{d}{V_a} = \frac{g_{d/V_a}}{g_{d/F_a}}
\end{equation}
</div>
</div>
<div id="outline-container-org133086b" class="outline-3">
<h3 id="org133086b"><span class="section-number-3">3.5</span> Piezoelectric Sensor Constant</h3>
<div class="outline-text-3" id="text-3-5">
<p>
From a quasi static (1Hz) excitation of the piezoelectric stack, measure the gain from \(V_a\) to \(V_s\):
</p>
\begin{equation}
V_s = g_{V_s/V_a} V_a
\end{equation}
<p>
Using the simscape model, compute the static gain from the actuator force \(F_a\) to the strain of the sensor stack \(dl\):
</p>
\begin{equation}
dl = g_{dl/F_a} F_a
\end{equation}
<p>
Then, the static gain from the sensor stack strain \(dl\) to the general voltage \(V_s\) is:
</p>
\begin{equation}
g_s = \frac{V_s}{dl} = \frac{V_s}{V_a} \cdot \frac{V_a}{F_a} \cdot \frac{F_a}{dl} = \frac{g_{V_s/V_a}}{g_a \cdot g_{dl/F_a}}
\end{equation}
<p>
Alternatively, we could impose an external force to add strain in the APA that should be equally present in all the 3 stacks and equal to 1/5 of the vertical strain.
This external force can be some weight added, or a piezo in parallel.
</p>
</div>
</div>
<div id="outline-container-org6d5e309" class="outline-3">
<h3 id="org6d5e309"><span class="section-number-3">3.6</span> Capacitance Measurement</h3>
<div class="outline-text-3" id="text-3-6">
<p>
Measure the capacitance of the 3 stacks individually using a precise multi-meter.
</p>
</div>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="author">Author: Dehaeze Thomas</p>
<p class="date">Created: 2020-12-15 mar. 23:33</p>
<p class="date">Created: 2020-12-16 mer. 11:07</p>
</div>
</body>
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@ -48,13 +48,28 @@ This include:
- Stroke
- Stiffness
- Hysteresis
- Gain from $V_a$ to $d$ (in [m/V]), then it should be possible to compute the gain from $V_a$ to $F_a$ using the Simscape model
- Gain from $\delta L$ to $V_s$ (in [V/m])
- Gain from the applied voltage $V_a$ to the generated Force $F_a$
- Gain from the sensor stack strain $\delta L$ to the generated voltage $V_s$
* Model of an Amplified Piezoelectric Actuator and Sensor
- [ ] Schematic of the APA with values of displacement, voltages, forces, etc.
- [ ] Required things to measure
Consider a schematic of the Amplified Piezoelectric Actuator in Figure [[fig:apa_model_schematic]].
A voltage $V_a$ applied to the actuator stacks will induce an actuator force $F_a$:
\begin{equation}
F_a = g_a \cdot V_a
\end{equation}
A change of length $dl$ of the sensor stack will induce a voltage $V_s$:
\begin{equation}
V_s = g_s \cdot dl
\end{equation}
We wish here to experimental measure $g_a$ and $g_s$.
#+name: fig:apa_model_schematic
#+caption: Amplified Piezoelectric Actuator Schematic
[[file:figs/apa_model_schematic.png]]
* Test-Bench Description
@ -70,3 +85,85 @@ Here are the documentation of the equipment used for this test bench:
#+name: fig:test_bench_apa_alone
#+caption: Schematic of the Test Bench
[[file:figs/test_bench_apa_alone.png]]
* Measurement Procedure
** Stroke Measurement
Using the PD200 amplifier, output a voltage:
\[ V_a = 65 + 85 \sin(2\pi \cdot t) \]
To have a quasi-static excitation between -80 and 150V.
As the gain of the PD200 amplifier is 20, the DAC output voltage should be:
\[ V_{dac}(t) = 3.25 + 4.25\sin(2\pi \cdot t) \]
Verify that the voltage offset is zero!
Measure the output vertical displacement $d$ using the interferometer.
Then, plot $d$ as a function of $V_a$, and perform a linear regression.
Conclude on the obtained stroke.
** Stiffness Measurement
Add some (known) weight $\delta m g$ on the suspended mass and measure the deflection $\delta d$.
This can be tested when the piezoelectric stacks are open-circuit.
As the stiffness will be around $k \approx 10^6 N/m$, an added mass of $m \approx 100g$ will induce a static deflection of $\approx 1\mu m$ which should be large enough for a precise measurement using the interferometer.
Then the obtained stiffness is:
\begin{equation}
k = \frac{\delta m g}{\delta d}
\end{equation}
** Hysteresis measurement
Supply a quasi static sinusoidal excitation $V_a$ at different voltages.
The offset should be 65V, and the sin amplitude can range from 1V up to 85V.
For each excitation amplitude, the vertical displacement $d$ of the mass is measured.
Then, $d$ is plotted as a function of $V_a$ for all the amplitudes.
** Piezoelectric Actuator Constant
Using the measurement test-bench, it is rather easy the determine the static gain between the applied voltage $V_a$ to the induced displacement $d$.
Use a quasi static (1Hz) excitation signal $V_a$ on the piezoelectric stack and measure the vertical displacement $d$.
Perform a linear regression to obtain:
\begin{equation}
d = g_{d/V_a} \cdot V_a
\end{equation}
Using the Simscape model of the APA, it is possible to determine the static gain between the actuator force $F_a$ to the induced displacement $d$:
\begin{equation}
d = g_{d/F_a} \cdot F_a
\end{equation}
From the two gains, it is then easy to determine $g_a$:
\begin{equation}
g_a = \frac{F_a}{V_a} = \frac{F_a}{d} \cdot \frac{d}{V_a} = \frac{g_{d/V_a}}{g_{d/F_a}}
\end{equation}
** Piezoelectric Sensor Constant
From a quasi static (1Hz) excitation of the piezoelectric stack, measure the gain from $V_a$ to $V_s$:
\begin{equation}
V_s = g_{V_s/V_a} V_a
\end{equation}
Using the simscape model, compute the static gain from the actuator force $F_a$ to the strain of the sensor stack $dl$:
\begin{equation}
dl = g_{dl/F_a} F_a
\end{equation}
Then, the static gain from the sensor stack strain $dl$ to the general voltage $V_s$ is:
\begin{equation}
g_s = \frac{V_s}{dl} = \frac{V_s}{V_a} \cdot \frac{V_a}{F_a} \cdot \frac{F_a}{dl} = \frac{g_{V_s/V_a}}{g_a \cdot g_{dl/F_a}}
\end{equation}
Alternatively, we could impose an external force to add strain in the APA that should be equally present in all the 3 stacks and equal to 1/5 of the vertical strain.
This external force can be some weight added, or a piezo in parallel.
** Capacitance Measurement
Measure the capacitance of the 3 stacks individually using a precise multi-meter.