Multibody System Dynamics
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#1Tobias Rückwald (TUHH: Hamburg University of Technology)H-Index: 1
#2Alexander Held (TUHH: Hamburg University of Technology)H-Index: 6
Last. Robert Seifried (TUHH: Hamburg University of Technology)H-Index: 19
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Usually detailed impact simulations are based on isoparametric finite element models. For the inclusion in multibody dynamics simulation, e.g., in the framework of the floating frame of reference, a previous model reduction is necessary. A precise representation of the geometry is essential for modeling the dynamics of the impact. However, isoparametric finite elements involve the discretization of the geometry. This work tests isogeometric analysis (IGA) models as an alternative approach in the...
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This work reviews the main techniques to model dynamical systems with contact-impact events. Regularized and non-smooth formulations are considered, wherein the fundamental features associated with each approach are analyzed. A brief description of contact dynamics is presented, and an overview of the state-of-the-art of the main aspects related to the contact dynamics discipline is provided. This paper ends by identifying gaps in the current techniques and prospects for future research in the f...
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#1Veit Gufler (Free University of Bozen-Bolzano)H-Index: 2
#2Erich Wehrle (Free University of Bozen-Bolzano)H-Index: 11
Last. Andreas Zwölfer (TUM: Technische Universität München)H-Index: 1
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Design optimization of flexible multibody dynamics is critical to reducing weight and therefore increasing efficiency and lowering costs of mechanical systems. Simulation of flexible multibody systems, though, typically requires high computational effort which limits the usage of design optimization, especially when gradient-free methods are used and thousands of system evaluations are required. Efficient design optimization of flexible multibody dynamics is enabled by gradient-based optimizatio...
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A two-field formulation of the nonlinear dynamics of an elastic body is presented in which positions/orientations and the resulting velocity field are treated as independent. Combining a nonclassical description of elastic velocity that includes the convection velocity due to elastic deformation with floating reference axes minimizing the relative kinetic energy due to elastic deformation provides a fully uncoupled expression of kinetic energy. A transformation inspired by the classical Legendre...
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#1Alexander Held (TUHH: Hamburg University of Technology)H-Index: 6
The structural analysis and optimization of flexible multibody systems become more and more popular due to the ability to efficiently compute gradients using sophisticated approaches such as the adjoint variable method and the adoption of powerful methods from static structural optimization. To drive the improvement of the optimization process, this work addresses the computation of design sensitivities for multibody systems with arbitrarily parameterized rigid and flexible bodies that are model...
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#1Armin Bosten (Fraunhofer Society)
#2Alejandro Cosimo (University of Liège)H-Index: 6
Last. Olivier Bruls (University of Liège)H-Index: 21
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This paper describes the quasi-static formulation of frictionless line contact between flexible beams by employing the mortar finite element approach. Contact constraints are enforced in a weak sense along the contact region using Lagrange multipliers. A simple projection appropriate for thin beams with circular cross-sections is proposed for the computation of contact regions. It is combined with the geometrically exact beam formalism on the Lie group null null null null null null null null nul...
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#1S. M. Mirtaheri (IAU: Islamic Azad University)
#2Hassan Zohoor (Sharif University of Technology)H-Index: 13
In this study, we present explicit equations of motion for general mechanical systems exposed to holonomic and nonholonomic constraints based on the Gibbs-Appell formulation. Without constructing the Gibbs function, the proposed method provides a minimal set of first-order dynamic equations applicable for multibody constrained systems. Transforming the Newton–Euler equations from physical coordinates to quasivelocity spaces eliminate constraint reaction forces from motion equations. In this stud...
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#1Yingpeng Zhuo (DUT: Dalian University of Technology)H-Index: 1
#2Zhaohui Qi (DUT: Dalian University of Technology)H-Index: 10
Last. Shudong Guo (DUT: Dalian University of Technology)H-Index: 2
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The geometrical structure of constraints leads to the important conclusion that components of velocities and accelerations in the normal space of the constraint hypersurface are totally determined by the constraints. Orthogonal base vectors of the constraint’s normal and tangent spaces can be obtained by the QR decomposition with column permutation. A numerical method of closed-loop multibody systems with singular configurations is presented, in which the traditional hypothesis on independence o...
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#1José L. Escalona (University of Seville)H-Index: 17
#2Xinxin YuH-Index: 1
Last. Javier F. Aceituno (University of Jaén)H-Index: 10
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This paper describes and compares the use and limitations of two constraint-based formulations for the wheel–rail contact simulation in multibody dynamics: (1) the use of contact lookup tables and (2) the Knife-edge Equivalent Contact constraint method (KEC-method). Both formulations are presented and an accurate procedure to interpolate within the data in the lookup table is also described. Since the wheel–rail constraint contact approach finds difficulties at simultaneous tread and flange cont...
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