Discontinuous variational time integrators for complex multibody collisions
Discontinuous variational time integrators for complex multibody collisions
复制标题
用于复杂多体碰撞的不连续变分时间积分器
DOI:
10.1002/nme.4764
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发表时间:
2014
影响因子:
2.9
通讯作者:
M. Ortiz
中科院分区:
文献类型:
--
作者:
G. Johnson;S. Leyendecker;M. Ortiz
The objective of the present work is to formulate a new class ofdiscontinuous variational time integratorsthat allow the system to adopt two possibly different configurations at each sampling timetk, representing predictor and corrector configurations of the system. The resulting sequence of configuration pairs then represents adiscontinuous—ornon‐classical—trajectory. Continuous or classical trajectories are recovered simply by enforcing a continuity constraint at all times. In particular, in systems subject to one‐sided contact constraints simulated via discontinuous variational time integrators, the predictor configuration is not required to satisfy the one‐sided constraints, whereas the corrector configuration is obtained by a closest‐point projection (CPP) onto the admissible set. The resulting trajectories are generally discontinuous, ornon‐classical, but are expected to converge to classical or continuous solutions for decreasing time steps. We account for dissipation, including friction, by means of a discrete Lagrange–d'Alembert principle, and make extensive use of thespacetime formalismin order to ensure exact energy conservation in conservative systems, and the right rate of energy decay in dissipative systems. The structure, range and scope of the discontinuous variational time integrators, and their accuracy characteristics are illustrated by means of examples of application concerned with rigid multibody dynamics. Copyright © 2014 John Wiley & Sons, Ltd.
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DOI:
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发表时间:
2008
期刊:
影响因子:
--
作者:
S. Leyendecker;P. Betsch;P. Steinmann
通讯作者:
P. Steinmann
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
A. Lew
通讯作者:
A. Lew
影响因子:
1.6
作者:
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通讯作者:
B. Schmidt
影响因子:
4.1
作者:
S. Leyendecker;C. Hartmann;M. Koch
通讯作者:
M. Koch
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
M. González;B. Schmidt;Magdalena Ortiz
通讯作者:
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