Bulk Data Entry
EIGC – Complex Eigenvalue Extraction Data
Description
Defines data required to perform complex eigenvalue analysis.
Format
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
EIGC |
SID |
|
NORM |
G |
C |
|
ND0 |
|
|
Continuation for EIGC
|
ALPHAAJ |
OMEGAAJ |
|
|
|
|
ND1 |
|
|
|
|
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Field |
Contents |
SID |
Unique set identification number. No default (Integer > 0) |
NORM |
Indicates the option for normalizing eigenvectors. MAX - Normalize the component having the largest magnitude to a unit value for the real part and a zero value for the imaginary part. POINT - Normalize the component defined in fields 5 and 6 to a unit value for the real part and a zero value for the imaginary part. The value for NORM defaults to MAX if the magnitude of the defined component is zero. Default = MAX |
G |
Grid or scalar point identification number. Required only if NORM = POINT. No default (Integer > 0) |
C |
Component number. Required only if NORM = POINT and G is a geometric grid point. No default (0 < Integer < 6) |
ND0 |
Desired number of roots and eigenvectors to be extracted. Required if there is no continuation, and it must be empty if there is a continuation line. No default (Integer > 0) |
ND1 |
Desired number of roots and eigenvectors to be extracted. No default (Integer > 0) |
ALPHAAJ |
Real part of the shift point. Default = 0.0 (Real) |
OMEGAAJ |
Imaginary part of the shift point. Default = 0.0 (Real) |
1. | ALPHAAJ and OMEGAAJ are only useful for direct complex eigenvalue analysis. If there is no METHOD command present in the subcase control area, the direct method is considered for the complex eigenvalue analysis. Otherwise, modal method is used. |
2. | The third field is reserved for a numerical complex eigensolution (METHOD). Currently, this field should be left blank; however, certain method types (INV, HESS and CLAN) will be accepted, but there will be no effect on the analysis. |
See Also: