SecondOrder-LRC.html models an LRC circuit with input the superposition of two sine waves. The DE is
LV'' + RV' + (1/C)V = E'. Here L,R,C are circuit elements, V is the output voltage across the
resistor and E = a*sin(w1*t) + b*sin(w2*t) is the input EMF.
There are a number of versions of this:
SecondOrder-LRC-launch.html gives a resizable version
of the applet.
SecondOrder-LRC2.html plots input and output on the same axes.
SecondOrder-LRC-cosInput.html is the same as SecondOrder-LRC but uses input
E = a*cos(w1*t) + b*cos(w2*t)
SecondOrder-LRC-cosInput-launch.html gives a resizable version of SecondOrder-LRC-cosInput.
SecondOrder-LRC2-cosInput.html plots the input and output on the same axes.
SecondOrder-LRC-help.html gives help on the applet.
SecondOrder-mbk.html models a spring-mass-dashpot system with input the superposition of two sine waves.
SecondOrder-mbk-launch.html gives a resizable
version.
SecondOrder-mbk2.html plots input and output on the same
axes.
SecondOrder-mbk-help.html gives help.
jcm-ref.html references the source of the basic Java classes I used.
SecondOrder-parameters.html gives help on all the settable parameters in the applet.
sample-params.html is a ridiculous looking applet that shows a range of parameter settings.