METHOD

Subcase Information Entry

METHOD - Data Selection

Description

The METHOD command can be used in the Subcase Information section to select a method for real eigenvalue extraction.

Format

METHOD (type) = option

Argument

Options

Description

type

<STRUCTURE, FLUID>

Default = STRUCTURE

The referenced EIGRL or EIGRA bulk data entry is applied to the structural (STRUCTURE) or fluid (FLUID) portion of the model.

option

< SID >

No default

SID:

Set identification of an EIGRL or EIGRA bulk data entry.

Comments

1.	Only one METHOD entry of each type can be defined for each subcase.

If only one type of METHOD entry is defined (either METHOD(STRUCTURE) or METHOD(FLUID)), this definition will be used for both the structure and the fluid portion of the model.

2.	A METHOD entry cannot be present in the same subcase definition as a LOAD entry.

3.	A METHOD entry is required for normal modes, linear buckling, modal frequency response, and modal transient response solution sequences.

4.	If present above the first subcase, it is used in all subsequent subcases which can accept a METHOD entry. However, this does not apply to subcases which already contain their own METHOD entry.

5.	AMSES can be used for the fluid (FLUID) part of the model. METHOD(FLUID) can reference an EIGRA bulk data entry.