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PARAM, TRAKMETH

PARAM, TRAKMETH

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PARAM, TRAKMETH

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Parameter

Values

Description

TRAKMETH

<0, 1, 2>

Default = 0

Defaults:

•The value of this parameter is 0 if it is not included in input file.
•If this parameter is included in the input file, but no value is provided, then running the program will result in an error.

TRAKMETH is a parameter that can be used to select the criterion employed for mode tracking.

There are three tracking criteria available for selection in the current implementation:

•Mass cross-orthogonality check (CORC)
•Modal assurance criterion (MAC)
•Modal assurance criterion square root (MACSR)

If TRAKMETH = 0

The Mass cross-orthogonality check (CORC) criterion is used for mode tracking. This performs a mass orthogonality check of the current and previous eigenvectors after reanalysis. CORC is implemented as follows:

trakmeth_0

If TRAKMETH = 1

The Modal assurance criterion square root (MACSR) criterion is used for mode tracking. This criterion essentially calculates the dot product of the two unit vectors associated with the current and previous eigenvectors. MACSR is implemented as follows:

trakmeth_1

If TRAKMETH = 2

The standard modal assurance criterion (MAC) is used for mode tracking. MAC is implemented as follows:

trakmeth_2

Where,

eigenvector_current is the current eigenvector.

eigenvector_prev is the previous eigenvector.

mass_matrix is the mass matrix.

Note:

PARAM, MODETRAK, YES or the subcase selector MODTRAK = YES should be added to the input file to activate mode tracking.

See Also:

Normal Modes Analysis

PARAM, MFILTER