1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Dual Mass-Spring System help!

  1. Dec 5, 2009 #1
    Lets see if anyone can help me with this.

    I have to derive a transfer function for the following:

    A small satellite with a moment of inertia J1 that has a instrument with a moment of inertia J2. The instrument is at the end of a small strut that has a stiffness constant of k and a damping coefficient of b. A torque is applied to the satellite.

    I know that the satellite and instrument (and their respective moments of inertia) can be modeled as two masses with mass m1 and m2. The "strut" above is a spring in this case with the same k and b values. The torque described above can be modeled as a force applied to m1 here. x1 and x2 are the displacements of each mass.

    I already have the final transfer function but I don't quite know how to derive it:

    X(s)/F(s) =(bs+k)/(J1J2s^4+(J1+J2)bs^3+(J1+J2)ks^2 )
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

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