Solving constrained mechanical systems by the family of Newmark and \(\alpha\)-methods. (English) Zbl 1116.70008
Summary: The family of Newmark and generalized \(\alpha\)-methods is extended to constrained mechanical systems by using simultaneous position and velocity stabilization as key ideas. In this way, the acceleration constraints need not be evaluated, and the overall algorithm is about as expensive as the application of a BDF method to the GGL-stabilized equations of motion. Moreover, the RATTLE method of molecular dynamics is included as special case. A convergence analysis of the presented \(\alpha\)-RATTLE algorithm shows global second order in both position and velocity variables while the Lagrange multipliers are computed to first-order accuracy. Additonally, the property of adjustable numerical dissipation carries over from the unconstrained case.
MSC:
| 70-08 | Computational methods for problems pertaining to mechanics of particles and systems |
| 70F20 | Holonomic systems related to the dynamics of a system of particles |
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