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/DAMP

/DAMP

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/DAMP

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Engine Keyword

/DAMP - Damp Option

Description

Identifying damp option.

Format

/DAMP/damp_ID

symbol_a-bold   coeffec-B-bold

Data

Description

damp_ID

Identifier of damping option in RADIOSS Starter (/DAMP).

symbol_a_14

Coefficient

coeffec-B

Coefficient

Comments

1.Rayleigh symbol_a_14 damping computation:

[C] = symbol_a_14[M] + coeffec-B[K]

Ci = symbol_a_14mi + coeffec-Bki

damp_comp2

damp_comp3

where,

[C] is the damping matrix

[M] is the mass matrix

[K] is the stiffness matrix

symbol_a_14 and coeffec-B are coefficients

Ci is the nodal damping matrix

mi is the nodal mass matrix

ki is the nodal stiffness matrix

Ccrit is the critical damping

2.If this option is not declared in the Runname_0000.rad file, it will not be available in RADIOSS Engine: arbitrary coefficients: alpha or beta may be declared in the Runname_0000.rad file and modified when repeating the option into the file Runname_run#.rad for RADIOSS Engine.

See Also:

Example 16.1 - Dummy Positioning

Rayleigh damping in Theory Manual

Skew and Frame (/SKEW & /FRAME)