At the end of this section you should be able to
Create local and global stiffness and mass matrices for longitudinal vibration problems
Apply homogeneous boundary conditions to the model
Find natural frequencies
Show convergence of your results
Solve for displacements for autonomous system
Local mass
and stiffness matrix
Damping is neglected.
This FEA allows
Non-homogeneous bars
Bars with a varying cross-section (did not see difference in natural frequencies)
However, we restricted the analysis to systems with
Homogeneous boundary conditions
No forcing, only initial conditions
Deformation in only linear-elastic region
Negligible damping