- #1
cma4h
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Homework Statement
I'm trying to figure out the mass and stiffness matrices for the following system:
Homework Equations
J1 = 3600 kg-m^2
J2 = 200 kg-m^2
J3 = 800 kg-m^2
J4 = 4800 kg-m^2
G (shear mod) = 8e10 Pa
The Attempt at a Solution
I've tried this setup:
M =
|J1 0 0|
|0 J2+J3 0|
|0 0 J4|
K =
|k1 -k1 0|
|-k1 k1+k2 -k2|
|0 -k2 k2|
where ki = GπDi4/(32Li)
but I don't think that is correct. Any ideas? Thanks.