1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: FBD servo link with SMD

  1. Nov 21, 2012 #1
    1. The problem statement, all variables and given/known data

    I have this system (attached) which I need to model using simulink (attached).

    2. Relevant equations

    My available variables/constants are: y, y', tita, tita dot, tita double dot, m=0.1, c=0.1, k=300, l=0.3.

    I derived the following equations from the free body diagrams;

    y = l*sin(tita)

    [itex]F = m\ddot{x} = l(k)sin(θ)+l(b)cos(θ)[/itex]

    [itex]T_{l} = Fcos(θ) + I\ddot{θ}[/itex] ;
    where [itex]I = ml^{2}[/itex]

    When I try simulating the system, it seems that it is unstable as an error for step size pops up. Do I have a mistake in my equations?

    Attached Files:

    Last edited: Nov 21, 2012
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted