diff --git a/content/zettels/mass_spring_damper_systems.md b/content/zettels/mass_spring_damper_systems.md
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@@ -180,6 +180,16 @@ The transfer functions from \\(F\_2\\) to the mass displacements are shown in [F
 {{< figure src="/ox-hugo/mass_spring_damper_2dof_F2_bode_plots.png" caption="<span class=\"figure-number\">Figure 7: </span>Transfer functions from F2 to x1 and x2" >}}
 
 
+## Simple analysis of measured dynamics {#simple-analysis-of-measured-dynamics}
+
+
+### Models {#models}
+
+<a id="figure--fig:mass-spring-damper-flex-above"></a>
+
+{{< figure src="/ox-hugo/mass_spring_damper_flex_above.png" caption="<span class=\"figure-number\">Figure 8: </span>2 DoF Mass Spring Damper system" >}}
+
+
 ## Bibliography {#bibliography}
 
 <style>.csl-entry{text-indent: -1.5em; margin-left: 1.5em;}</style><div class="csl-bib-body">
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