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This command is used to construct a TransientIntegrator object of type Newmark.
integrator Newmark $gamma $beta
$gamma |
Newmark parameter g |
$beta |
Newmark parameter b |
The damping matrix D is specified as a combination of stiffness and mass-proportional damping matrices:
D = $alphaM * M + $betaK * Kcurrent +$betaKinit * Kinit + $betaKcomm * KlastCommit
The mass and stiffness matrices are defined as:
M |
mass matrix used to calculate Rayleigh Damping |
Kcurrent |
stiffness matrix at current state determination used to calculate Rayleigh Damping |
Kinit |
stiffness matrix at initial state determination used to calculate Rayleigh Damping |
KlastCommit |
stiffness matrix at last-committed state determination used to calculate Rayleigh Damping |
Note: Damping should be specified using the Rayleigh command.
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