Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Transforming Order of ODE System

  1. Mar 1, 2007 #1
    Hi
    i got a question trying to solve some problems from my schools webpage and encountered a problem where im given 2 RLC-Circuits and the corresponding dgls for the oscilation ( no problem so for all the standart basic E/M stuff)

    But then im asked to transform this system of 2 dgl´s of second order to a system of first order ode´s ( think i´ll need 4 of them)

    It ´s kind of the same thing like transforming from lagrange to hamilton mechanics ( in a waage sense at least :) )

    Could you just test me which technique to use no need for a extensive explanetion of how to do don´t wanna steals one´s time ;) Can look that up in a book.
    bye and thanks so far :)
     
  2. jcsd
  3. Mar 1, 2007 #2
    Usually you can transform a second order ode to first order ode by using a Laplace transformation.
     
  4. Mar 1, 2007 #3
    I not up on the EE jargon (dgl?) but, if you have a second-order diff. equation, you can turn it into a system of first order diff eq's (say y is a function of x) by replacing u=y and v=y' (so the second-order term y" is replaced by v').
    This leads to a matrix form of the problem.
    (Try the ode book by Boyce and DiPrima)
     
  5. Mar 1, 2007 #4
    thx so far you really helped me out :)
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook