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index 54d3f56..c878776 100644
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index 92e455a..016df1b 100644
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@@ -6,7 +6,7 @@
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index 8a589e4..fdd7f00 100644
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diff --git a/test-bench-apa.org b/test-bench-apa.org
index a3373bd..c2b34f7 100644
--- a/test-bench-apa.org
+++ b/test-bench-apa.org
@@ -1381,8 +1381,8 @@ The model of the amplified piezoelectric actuator is shown in Figure ref:fig:tes
It can be decomposed into three components:
- the shell whose axial properties are represented by $k_1$ and $c_1$
- the actuator stacks whose contribution to the axial stiffness is represented by $k_a$ and $c_a$.
- The force source $\tau$ represents the axial force induced by the force sensor stacks.
- The sensitivity $g_a$ (in $N/m$) is used to convert the applied voltage $V_a$ to the axial force $\tau$
+ The force source $f$ represents the axial force induced by the force sensor stacks.
+ The sensitivity $g_a$ (in $N/m$) is used to convert the applied voltage $V_a$ to the axial force $f$
- the sensor stack whose contribution to the axial stiffness is represented by $k_e$ and $c_e$.
A sensor measures the stack strain $d_e$ which is then converted to a voltage $V_s$ using a sensitivity $g_s$ (in $V/m$)
diff --git a/test-bench-apa.pdf b/test-bench-apa.pdf
index e3b40b2..63c13a5 100644
Binary files a/test-bench-apa.pdf and b/test-bench-apa.pdf differ
diff --git a/test-bench-apa.tex b/test-bench-apa.tex
index eae5f1b..1f6e275 100644
--- a/test-bench-apa.tex
+++ b/test-bench-apa.tex
@@ -1,4 +1,4 @@
-% Created 2024-11-18 Mon 11:46
+% Created 2025-02-12 Wed 09:53
% Intended LaTeX compiler: pdflatex
\documentclass[a4paper, 10pt, DIV=12, parskip=full, bibliography=totoc]{scrreprt}
@@ -155,7 +155,7 @@ APA 7 & 4.85 & 9.85\\
To compare the stroke of the APA300ML with the datasheet specifications, one side of the APA is fixed to the granite, and a displacement probe\footnote{Millimar 1318 probe, specified linearity better than \(1\,\mu m\)} is located on the other side as shown in Figure \ref{fig:test_apa_stroke_bench}.
-The voltage across the two actuator stacks is varied from \(-20\,V\) to \(150\,V\) using a DAC\footnote{The DAC used is the one included in the IO133 card sold by Speedgoat. It has an output range of \(\pm 10\,V\) and 16-bits resolution} and a voltage amplifier\footnote{PD200 from PiezoDrive. The gain is \(20\,V/V\)}.
+The voltage across the two actuator stacks is varied from \(-20\,V\) to \(150\,V\) using a DAC\footnote{The DAC used is the one included in the IO131 card sold by Speedgoat. It has an output range of \(\pm 10\,V\) and 16-bits resolution} and a voltage amplifier\footnote{PD200 from PiezoDrive. The gain is \(20\,V/V\)}.
Note that the voltage is slowly varied as the displacement probe has a very low measurement bandwidth (see Figure \ref{fig:test_apa_stroke_voltage}).
\begin{figure}[htbp]
@@ -535,8 +535,8 @@ It can be decomposed into three components:
\begin{itemize}
\item the shell whose axial properties are represented by \(k_1\) and \(c_1\)
\item the actuator stacks whose contribution to the axial stiffness is represented by \(k_a\) and \(c_a\).
-The force source \(\tau\) represents the axial force induced by the force sensor stacks.
-The sensitivity \(g_a\) (in \(N/m\)) is used to convert the applied voltage \(V_a\) to the axial force \(\tau\)
+The force source \(f\) represents the axial force induced by the force sensor stacks.
+The sensitivity \(g_a\) (in \(N/m\)) is used to convert the applied voltage \(V_a\) to the axial force \(f\)
\item the sensor stack whose contribution to the axial stiffness is represented by \(k_e\) and \(c_e\).
A sensor measures the stack strain \(d_e\) which is then converted to a voltage \(V_s\) using a sensitivity \(g_s\) (in \(V/m\))
\end{itemize}