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Dynamic relaxation

assumed --> Damped System

301

Damping: C = α · M mass proportional

302

Approximate solution :

303

Remark :

304or

Remark : Computation of damped acceleration is not explicitely needed.

Implementation in LS-DYNA

1. usual

305

2. first step

306

3. all other steps

i = 1.... n

307

convergence check :

308