3 replies to this topic

[leon_aurel]

Hi, i have some problem with simulink. in simulink we can solve this equation : d^3y/(dx)^3+6d^2y/(dx)^2+11dy/dx+6y=1, both using integrator block or laplacing it first and using transfer function block... the problem is my lecturer want me to solve another equation d^3y/(dx)^3+6d^2y/(dx)^2+11dy/dx+6y+y^2=1. he want me to solve it using both ways.. i stuck with y^2.. i don't know how to transform it to s-domain nor using integrator block directly without laplacing it.

can anyone help me? thanks before

[Andres Valencia Michaud]

I've attached a pdf which will allow you to solve the problem. There's one thing I don't like about your problem... it's a tiny little thing you'll need to remember: Laplace and simulink work from the time plane to the s-plane. Said that, your equation is miss-typed unless your time axis is the "x-axis".
I hope it'll help you out.

Your transform block should be taken from:

s^3*y(s)-s^2*y(0)-s*y'(0)-y''(0)+6[s^2*y(s)-s*y(0)-y'(0)]+11[s*y(s)-y(0)]+6*y(s)+2/y(s)^3=0

Attached Files

•  ODE\'s solved using Simulink.pdf   100.54KB   20 downloads

[leon_aurel]

oh..i'm sorry..my fault..i forget about the x-domain. thanks for the literature..

[leon_aurel]

Sorry Andres, but i still can't understand why y^2 can be transformed to 2/y(s)^3...