Mathematica 9 is now available
Student Support Forum
-----
Student Support Forum: 'Simulating a Non-Linear System Using Ordinary Differential Equations.' topicStudent Support Forum > General > "Simulating a Non-Linear System Using Ordinary Differential Equations."

Help | Reply To Topic
Author Comment/Response
John L Neel
04/01/97 1:16pm

I have an non-linear oscillating system with one degree of freedom
that I would like to model using a system of linear ordinary differential
equations. X is the position of a mass m and is a function of time
t. there is viscous damper c and spring K. The spring disengages at
values of -eo < x < eo. for x < -eo the equation of motion is mx''[t]+cx'[t]+K(x[t]+eo)==f[t]
for -eo < x <eo the equation of motion is mx''[t] + cx'[t]==f[t] for
eo<x the equation of motion is mx''[t]+cx'[t]+K(x-eo)==f[t]. f[t]
is a step pulse of magnitude 1 applied at time t=0 and steps back
to zero at time t1. I want to solve this system for x[t] then do a
FFT and finally do a finally do a nyquist plot. Any ideas?


URL: ,
Help | Reply To Topic