hi, everybody(adsbygoogle = window.adsbygoogle || []).push({});

i got for homework a pendulum on a cart.

i solved the system and got two equations.

(m+M)x'' + M L theta'' = F

x'' + L theta'' + g* theta = 0

F = 1000 N, m = 500 kg, M = 1250 kg, l = 10m

i know how to put them in state space and solve them with SS block in

simulink.but i don't know how to solve the system with ode23. there are

no initial conditions stated in a task, i guess there are zero.

i understand this sintax

function xdot = vdpol(t,x)

xdot = [x(1).*(1-x(2).^2)-x(2); x(1)]

t0 = 0; tf = 20;

x0 = [0 0.25]'; % Initial conditions

[t,x] = ode23('vdpol',t0,tf,x0);

plot(t,x)

but dont know how to use it on those eq.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Two second order differential equation

**Physics Forums | Science Articles, Homework Help, Discussion**