EigenMode

Purpose

determines eigenfrequencies and eigenmodes of structural model

Synopsis

[omega,Ueig] = EigenMode (Kf,M,nmod)

Description

EIGENMODE determines eigenfrequencies and eigenmodes of structural model
  [OMEGA UEIG] = EIGENMODE(KF,M,NMOD)
  function determines the lowest NMOD (default=all) eigenfrequencies in row vector OMEGA
  and corresponding eigenmodes in array UEIG for a structure with free dof stiffness matrix KF
  and free dof lumped mass vector or consistent mass matrix M;
  the eigenmodes in array UEIG are arranged columnwise (column no=mode no)

Cross-Reference Information

This function calls:

• Condense_MV condense matrix Kf and vector Pf to a reduced set idr of degrees of freedom

• Create_Damping setup damping matrix of structural model
• ModalAnalysis determines modal response history for given transient loading