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EIGC

EIGC

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EIGC

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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

 

 

hmtoggle_plus1Example 1

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

EICG

4

 

MAX

 

 

 

15

 

 

hmtoggle_plus1Example 2

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

EIGC

4

 

MAX

 

 

 

 

 

 

 

 

 

 

 

 

 

15

 

 

hmtoggle_plus1Example 3

(1)

(2)

(3)

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(10)

EIGC

4

 

MAX

 

 

 

 

 

 

 

1000.0

1000.0

 

 

 

 

15

 

 

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)

Comments

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:

Complex Eigenvalue Analysis

Bulk Data Section

Guidelines for Bulk Data Entries

Bulk Data Entries by Function

The Input File