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How to solve 3DOFs using ECP system?

  1. Dec 2, 2008 #1
    equations of motions for 3DOFs obtained.
    but how do i solve for e 6 unknows: m1 m2 m3 k1 k2 k3 using the ECP system?

    Equations formulated as below:

    [A] { m1 }
    { m2 }
    { m3 } = [F]
    { k1 }
    { k2 }
    { k3 }

    where [A] is a 6 by 9 matrix: first 3 rows at freq w1, next 3 rows at w2, last 3 rows at w3
    [F] (1 by 9 matrix) : is the applied force for each sinosindual excitation under 3 diff frequencies.

    Natural freq of this 3DOFs was obtained and excited with sinosindual by input-ing at each of these 3 natural frequency (hence able to find amplitude of these vibrations, but so many amplitudes, which 1 to select???). And how should I go about solving the 6 unknowns?
    Can anyone help me?
    Last edited: Dec 2, 2008
  2. jcsd
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