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This command is used to construct a TransientIntegrator object of type HHT or HHT1.
integrator HHT $gamma <$alphaM $betaK $betaKinit $betaKcomm>
$gamma |
Newmark parameter ? |
$alphaM $betaK $betaKinit $betaKcomm |
Arguments to define Rayleigh damping matrix (optional, default: zero) |
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 |
Kcurrent |
stiffness matrix at current state determination |
Kinit |
stiffness matrix at initial state determination |
KlastCommit |
stiffness matrix at last-committed state determination |
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