EIGRD

Bulk Data Entry Defines data required to perform eigenvalue extraction using the Lapack-based dense solver.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EIGRD SID V1 V2 ND       NORM  

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EIGRD   0.1 3.2 10          

Definitions

Field Contents SI Unit Example
SID Unique set identification number.

No default (Integer > 0)

  
V1,V2 For vibration analysis: Frequency range of interest.

Default = blank (V1 < V2, Real, or blank)

  
ND Number of roots desired.

No default (Integer > 0 or blank)

  
NORM Method used for eigenvector normalization.
MASS
Eigenvectors are normalized to the unit value of the generalized mass.
MAX
Eigenvectors are normalized to the unit value of the largest displacement in the analysis set.

Default = MASS for normal modes analysis

  

Comments

  1. For CMS residual runs, EIGRD is suitable for models with 20,000 degrees of freedom or lower.