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Structural Engineering (structural + engineering)

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Engineering75%

Selected Abstracts

Fast simulation of skin sliding

COMPUTER ANIMATION AND VIRTUAL WORLDS (PREV: JNL OF VISUALISATION & COMPUTER ANIMATION), Issue 2-3 2009
Xiaosong Yang
Abstract Skin sliding is the phenomenon of the skin moving over underlying layers of fat, muscle and bone. Due to the complex interconnections between these separate layers and their differing elasticity properties, it is difficult to model and expensive to compute. We present a novel method to simulate this phenomenon at real-time by remeshing the surface based on a parameter space resampling. In order to evaluate the surface parametrization, we borrow a technique from structural engineering known as the force density method (FDM)which solves for an energy minimizing form with a sparse linear system. Our method creates a realistic approximation of skin sliding in real-time, reducing texture distortions in the region of the deformation. In addition it is flexible, simple to use, and can be incorporated into any animation pipeline. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Synthesis in optimization of bionics bascule bridges

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 8 2007
Alexander Tesar
Abstract The optimization of modern bionics bascule bridges mapping the configurations from the nature and adopted in advanced structural engineering is dealt with in the present paper. Theoretical and numerical approaches suggested are based on the evolution algorithms also appearing in the nature. Generalized synthesis in optimization of ultimate behaviour of bionics bascule bridges is analysed. Actual structural application based on such principles is submitted. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Micromechanics of fibre glass composites at elevated temperatures

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 3 2002
Alexander Tesar
Abstract The micromechanical assessment of ultimate response of moulded fibre glass (MFG) composites used in structural engineering and acting at elevated temperatures is treated in the present paper. The advanced crystal simulation model of the MFG-material at elevated temperatures, based on Washizu's variational principle, is presented. The numerical treatment of non-linear problems possibly appearing is made using the updated Lagrangian formulation of motion. Each step of iteration approaches the solution of the linear problem and the feasibility of the parallel processing FETM-simulation approach is established. Some numerical and experimental results are presented in order to demonstrate the efficiency of procedures suggested. Copyright © 2002 John Wiley & Sons, Ltd. [source]

Sound Insulation by Laminated Viscoelastic Plates

PROCEEDINGS IN APPLIED MATHEMATICS & MECHANICS, Issue 1 2003
S. Langer Dr.-Ing.
Plates are basic components in industrial structural design whose acoustical properties are often very important to reduce noise, e.g., in a car or a building. The sound insulation by plates is influenced by various effects, e.g., by the plate's mass but also by their damping capability. Hence, for a realistic analysis, damping should be taken into account which can approximatively be modelled by the use of a viscoelastic material law. Moreover, in automotive industry and structural engineering, laminated plates are very common to improve stiffness and stability, where plates with a viscoelastic core and rigid faces show additionally an excellent acoustical behaviour. Those laminated panes with a viscoelastic core are used in the design of windscreens, and, to improve sound insulation, in the design of building windows. Here, the mechanical behaviour of such a laminated plate is described by using a homogenisation procedure. The damping property of the plate is influenced by the stiffness of the viscoelastic core, it's dissipation factor, and by the thickness of the dissipating layer. These properties of a three-layer-plate are mapped on homogenised material parameters of a simple plate via the Ansatz of Ross, Kerwin and Ungar (RKU-Ansatz). Finally, the sound insulation effectiveness of plates is analysed numerically. [source]