How can I solve a nonlinear differential equation for MDOF system in Matlab using ODE45?

I have a simple system which has 3dof. Stiffness matrix of this system depends on dof's displacement such as ki=k0*[1-0.1*sqrt(ui)]. I would like to solve this problem using ode45. But I could not...

26 April 2014 4,001 4 View