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A gluing algorithm for distributed simulation of multibody systems

NONLINEAR DYNAMICS 2003年第1-2期34卷 159-188页

作者： Wang, JZ Ma, ZD Hulbert, GM Univ Michigan Dept Mech Engn Ann Arbor MI 48109 USA

A new gluing algorithm is presented that can be used to couple distributed subsystem models for dynamics simulation of mechanical systems. Using this gluing algorithm, subsystem models can be analyzed at their distributed locations, using their own independent solvers, and on their own platforms. The gluing algorithm developed relies only on information available at the subsystem interfaces. This not only enables efficient integration of subsystem models, but also engenders model security by limiting model access only to the exposed interface information. These features make the algorithm suitable for a real and practical distributed simulation environment.

关键词： distributed simulation gluing algorithm multibody system simulation structural dynamics

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A gluing algorithm for distributed simulation of multibody systems

A gluing algorithm for distributed simulation of multibody s...

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4th Symposium on Multibody Dynamics and Vibration

作者： Wang, JZ Ma, ZD Hulbert, GM Univ Michigan Dept Mech Engn Ann Arbor MI 48109 USA

关键词： distributed simulation gluing algorithm multibody system simulation structural dynamics

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A combinatorial problem related to sparse systems of equations

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DESIGNS CODES AND CRYPTOGRAPHY 2017年第1期85卷 129-144页

作者： Horak, Peter Semaev, Igor Tuza, Zsolt Univ Washington Sch Interdisciplinary Arts & Sci Tacoma WA USA Univ Bergen Dept Informat Bergen Norway Hungarian Acad Sci Alfred Renyi Inst Math Budapest Hungary Univ Pannonia Veszprem Hungary

Nowadays sparse systems of equations occur frequently in science and engineering. In this contribution we deal with sparse systems common in cryptanalysis. Given a cipher system, one converts it into a system of sparse equations, and then the system is solved to retrieve either a key or a plaintext. Raddum and Semaev proposed new methods for solving such sparse systems common in modern ciphers which are combinations of linear layers and small S-boxes. It turns out that the solution of a combinatorial MaxMinMax problem provides an upper bound on the average computational complexity of those methods. In this paper we initiate the study of a linear algebra variation of the MaxMinMax problem. The complexity bound proved in this paper significantly overcomes conjectured complexity bounds for Grobner basis type algorithms.

关键词： Sparse systems of equations MaxMinMax problem gluing algorithm

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Simulation of multibody systems with the use of coupling techniques: a case study

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MULTIBODY SYSTEM DYNAMICS 2011年第2期25卷 145-165页

作者： Tomulik, Pawel Fraczek, Janusz Warsaw Univ Technol Inst Aeronaut & Appl Mech PL-00665 Warsaw Poland

Simulation coupling (or cosimulation) techniques provide a framework for the analysis of decomposed dynamical systems with the use of independent numerical procedures for decomposed subsystems. These methods are often seen as very promising because they enable the utilization of the existing software for subsystem analysis and usually are easy to parallelize, and run in a distributed environment. For example, in the domain of multibody systems dynamics, a general setup for "gluing algorithms" was proposed by Wang et al. It was intended to provide a basis for multilevel distributed simulation environments. The authors presented an example where Newton's method was used to synchronize the responses of subsystem simulators. In this paper, we discuss some properties of a simplified iterative coupling scheme, where subsystems' responses are synchronized at discrete time points. We use a simple multibody model to investigate the influence of synchronization parameters on computations. We also try to provide explanation to the oscillatory behavior of the solutions obtained from this method.

关键词： Multibody dynamics Cosimulation Simulator coupling Distributed integration gluing algorithm

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Simulation of multibody systems with the use of coupling techniques: a case study

Simulation of multibody systems with the use of coupling tec...

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ECCOMAS Thematic Conference on Multibody Dynamics

作者： Tomulik, Pawel Fraczek, Janusz Warsaw Univ Technol Inst Aeronaut & Appl Mech PL-00665 Warsaw Poland

关键词： Multibody dynamics Cosimulation Simulator coupling Distributed integration gluing algorithm

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