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检索条件"任意字段=Conference on Mathematical Modelling in Engineering and Human Behaviour"

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modelling of the dynamic behaviour of tubular steel-concrete composite footbridges subjected to pedestrian-induced vibrations

Modelling of the dynamic behaviour of tubular steel-concrete...

引用

14th International conference on Civil, Structural and Environmental engineering Computing, CC 2013

作者： Debona, G.L. Santos Da Silva, J.G. Sieira, A.C.C.F. Costa Neves, L.F. Civil Engineering Post-graduate Programme State University of Rio de Janeiro Brazil Structural Engineering Department State University of Rio de Janeiro Brazil Civil Engineering Department University of Coimbra Portugal

ISBN: (纸本)9781905088577

The study of the dynamic effects caused by human activities over structural systems has gained a significant relevance during the last few years. On the other hand, some recently constructed pedestrian footbridges have been criticised by the public for their susceptibility to vibration. The main objective of the investigation, described in this paper, is to present the finite element modelling of the dynamic behaviour of tubular composite (steel-concrete) footbridges subject to human walking vibrations. The investigated structural system was based on a tubular composite (steel-concrete) footbridge, spanning 82.5 m. The structural model consists of tubular steel sections and a concrete slab. The investigation was carried out based on correlations between the experimental results related to the footbridge dynamic response and those obtained with finite element modelling. The finite element model enabled a complete dynamic evaluation of the tubular footbridge in terms of human comfort and its associated vibration serviceability limit states. The peak accelerations found in the present analysis indicated that the investigated tubular footbridge presented problems related with human comfort. Hence it was detected that this type of structure can reach high vibration levels that can compromise the footbridge user's comfort and especially its safety. © Civil-Comp Press, 2013.

关键词： Structural dynamics

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Numerical modelling of the static and seismic behaviour of historical buildings: The church of san francesco in Lucca

Numerical modelling of the static and seismic behaviour of h...

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14th International conference on Civil, Structural and Environmental engineering Computing, CC 2013

作者： Girardi, M. Padovani, C. Pasquinelli, G. Institute of Information Science and Technologies Italian National Research Council Pisa Italy

ISBN: (纸本)9781905088577

This paper describes the numerical modelling of the structural behaviour of the church of San Francesco in Lucca, Italy. The constitutive equation for the various types of masonry employed in historic buildings views masonry as a nonlinear elastic material with zero tensile strength and infinite or bounded compressive strength. As such an equation has proven to be able to realistically model the most significant aspects of masonry behaviour, it has been implemented in the finite element code NOSA-ITACA for solving equilibrium and evolution problems of solids not withstanding tension, as well as for modelling restoration and consolidation operations. Numerical analyses of the church of San Francesco have been conducted using the NOSA-ITACA code. The church, which dates back to the thirteenth century, presents evident fractures and deformations mainly due to the large dimensions of its nave. It has been studied under two different conditions: in its actual state and in the presence of reinforcement structures. In particular, an assessment has been made of the effects of a metal framework, applied atop the longitudinal walls, on the behaviour of the structure subjected to its own weight and horizontal actions modelling an earthquake. The case study described in the paper highlights the important role of mathematical models and numerical tools in assessing the mechanical behaviour of historical masonry buildings in the presence of earthquakes, as well as in planning strengthening operations on such structures. © Civil-Comp Press, 2013.

关键词： Numerical methods

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Forecasting of the traffic flow distribution in the transport network 23

Forecasting of the traffic flow distribution in the transpor...

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23rd International Scientific conference on Transport Means 2019

作者： Ziólkowski, J. Zieja, M. Oszczypala, M. Faculty of Mechanical Engineering Military University of Technology Warsaw Poland Air Force Institute of Technology Warsaw Poland

Based on the numerical example, the article presents the possibilities of mathematical modelling for testing the transport systems. On the basis of the conducted analysis of the transport system model, it was shown that it is possible to estimate the traffic flow distribution in the assumed network, which, in fact, constitutes the foundation for forecasting the transport system functioning. The forecast of the traffic flow distribution may be input data for the road congestion analysis, estimates of road infrastructure consumption and its expansion. By adopting probabilistic input data to the system, it is possible to develop options of the transport system behaviour in various situations. This information is useful in the process of controlling the transport processes, as well as when planning investments related to the transport infrastructure. Therefore, the mathematical modelling allows to make optimal choices, both in planning processes and in decision-making processes. © 2019 Kaunas University of Technology. All rights reserved.

关键词： Investments

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modelling the behaviour of an oil spill in marine environments

Modelling the behaviour of an oil spill in marine environmen...

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6th International conference on engineering Computational Technology, ECT 2008

作者： Markatos, N.C. Psaltaki, M.G. School of Chemical Engineering National Technical University of Athens Greece

ISBN: (纸本)9781905088249

Assessment of an oil-spill behaviour in the maritime environment is absolutely necessary, as a great amount of petroleum is transported by cargo ships and pipelines through this environment. Moreover, the increase in offshore oil exploration, and the drilling and production activities enhance the potential for oil spills that damage the marine ecosystems, given that oil toxicity creates major environmental problems. Assessment of the impact of an oil spill on the marine environment may be based on mathematical models, that appear to be important tools for relevant studies. This paper describes a general deterministic model developed to simulate the time-dependent behaviour of oil spills near coastal regions a? well as in the open sea. The model solves the full Navier-Stokes equations for transient two-phase, three-dimensional turbulent flow, heat and mass transfer, including most of the important aspects of the physical, chemical and biological processes that govern the behaviour of oil slicks at sea. The solution method is based on the finite-volume method. The model capabilities are demonstrated by applying it to oil spills at two coastal regions;near Carava, at the island of Lesvos, and near Eretria, in the Evvoikos bay, both being in the Aegean sea, Greece. It is concluded that meaningful and useful results are obtained within reasonable computer resources. © 2008 Civil-Comp Press.

关键词： Oil spills

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3D bone tissue growth in hollow fibre membrane bioreactor: implications of various process parameters on tissue nutrition

3D bone tissue growth in hollow fibre membrane bioreactor: i...

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4th conference on engineering with Membranes - Medical and Biological Applications

作者： Abdullah, N. S. Das, D. B. Ye, H. Cui, Z. F. Univ Oxford Dept Engn Sci Oxford OX1 3PJ England

New experimental evidence shows that hollow fibre membrane bioreactor (HFMB) may be applied to grow bulky bone tissues which may then be implanted into patients to repair skeletal defects. To design effective bone tissue engineering protocols, it is necessary to determine the quantitative relationships between the cell environment and tissue behaviour in HFMBs and their relationship with nutrient supply. It is also necessary to determine under what conditions nutritional limitations may occur and, hence, may cause cell death. These require that the appropriate bioreactor conditions for generating neotissues, and the nutrient transfer behaviour and chemical reaction during cell growth and extracellular matrix formation are studied thoroughly. In this paper, we aim to use an existing mathematical framework to analyse the influence of various relevant parameters on nutrient supply for bone tissue growth in HFMB. We adopt the well-known Krogh cylinder approximation of the HFMB. The model parameters ( e. g., cell metabolic rates) and operating conditions for the mathematical model have been obtained from, or correspond to, in-house experiments with the exception of a few variables which have been taken from the literature. The framework is then used to study oxygen and glucose transport behaviour in the HFMB. Influence of a number of important process parameters, e. g., reaction kinetics, cell density, inlet concentration of nutrients, etc, on the nutrient distributions have been systematically analysed. The work presented in this paper provides insights on unfavourable system designs and specifications which may be avoided to prevent mass transfer limitations for growing bone tissues in HFMB.

关键词： bone tissue engineering hollow fibre membrane bioreactor bulky bone tissues mathematical modelling Krogh cylinder geometry

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Solving cross-disciplinary problems by mathematical modelling 11

Solving cross-disciplinary problems by mathematical modellin...

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11th International conference on Mechanical engineering, Automation and Control Systems (MEACS)

作者： Panfilov, D. A. Romanchikov, V. V. Krupin, K. N. Samara State Tech Univ 194 Molodogvardeyska St Samara 443001 Russia Reaviz Med Univ 227 Chapaevska St Samara 443001 Russia

The article deals with the creation of a human tibia 3D model by means of "Autodesk Revit-2016" PC based on tomogram data. The model was imported into "Lira-SAPR2013 R4" software system. To assess the possibility of education and the nature of bone fracture (and their visualization), the Finite Element Analysis (FEA) method was used. The geometric parameters of the BBK model corresponded to the physical parameters of the individual. The compact plate different thickness is modeled by rigidity properties of the finite elements in accordance with the parameters on the roentgenogram. The BBK model included parameters of the outer compact plate and the spongy substance having a more developed structure of the epiphysic region. In the "Lira-SAPR2013 R4" software system, mathematical modeling of the traumatic effect was carried out and the analysis of the stress-strain state of the finite element model of the tibia was made to assess fracture conditions.

关键词： Computer software

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modelling of the collapsible behaviour of unsaturated soils in hypoplasticity

Modelling of the collapsible behaviour of unsaturated soils ...

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作者： Maší, D. Khalili, N. Charles University Prague Czech Republic University of New South Wales Sydney Australia

ISBN: (纸本)0415476925

The paper presents a recently developed constitutive model for unsaturated soils, based on the theory of hypoplasticity and the effective stress principle. The mathematical formulation of the model is outlined and the required state variables and parameters are described. The model is, among other features of unsaturated soil behaviour, capable of predicting collapse upon wetting, a phenomenon that could not be modelled with earlier hypoplastic models. Predictions of wetting-induced collapse agree well with experimental data on statically compacted Pearl clay. © 2008 Taylor & Francis Group, London.

关键词： Constitutive models

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Database and modelling strategy: A compliant way for display optimisation 1

Database and modelling strategy: A compliant way for display...

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1st International conference on WEB Information Systems engineering (WISE 2000)

作者： Farenc, N Sidler, F Ferrando, A Thalmann, D Swiss Fed Inst Technol Comp Graph Lab CH-1015 Lausanne Switzerland

ISBN: (纸本)0769505775

In order to display huge scenes with virtual human inhabitants evolving inside a virtual city, we propose a methodology to create and manage different Level of Detail for a well-segmented scene without "re-meshing" the scene during simulation. A database dedicated to urban life simulation providing data for planning human actions and behaviour is completed such a way to furnish information about the most adapted displayed representations.

关键词： Behavioral research

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modelling of fluid flow in a petroleum reservoir using an engineering approach

Modelling of fluid flow in a petroleum reservoir using an en...

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SPE Trinidad and Tobago Section Energy Resources conference 2018

作者： Hashan, Mahamudul Jahan, Labiba Nusrat Uz Zaman, Tareq Elhaj, Murtada Imtiaz, Syed Hossain, M. Enamul Memorial University of Newfoundland Canada Nazarbayev University Kazakhstan

The mathematical approach is the most commonly used approach in reservoir simulation. The classical mathematical approach considers numerous impractical assumptions leading toward the development of unrealistic reservoir simulator. In contrast, recently developed engineering approach is much promising as it has numerous advantages, such as – scope of bypassing the formulation of partial differential equations and discretization of partial differential equations, the ability to avoid rigorous and complex mathematics, and capability of realistic representation of reservoir behaviour through eliminating spurious assumptions. The present study outlines the route map for developing a reservoir simulator using an engineering approach. Major challenges encountered in reservoir simulation and the fundamentals of various available modelling approaches are addressed in this paper. The outlook for both classical mathematical approach and engineering approach are reviewed along with their strengths and weaknesses. Fluid flow equations are derived based on the proposed engineering approach. To do that, a set of non-linear algebraic flow equations in the time integral form is developed using the mass balance equation, an equation of state, and a constitutive equation without going through the formulation of partial differential equations and discretization step. The time integral is then approximated to obtain the non-linear algebraic flow equations for all the gridblocks of the reservoir. The significance of the engineering approach for describing the accurate fluid flow through porous media is compared to the to conventional mathematical approach. The engineering approach provides the same fluid flow equations as the classical mathematical approach for both the radial cylindrical and cartesian coordinate system but, without going through the formulation of partial differential equations and discretization step. Much simpler ordinary differential equation solvers, e.g., Runge-Ku

关键词： Ordinary differential equations

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modelling and simulating human behaviours with conceptual graphs 5th

Modelling and simulating human behaviours with conceptual gr...

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5th International conference on Conceptual Structures (ICCS 97)

作者： Bos, C Botella, B Vanheeghe, P Inst Super Elect N F-59046 Lille France LAIL CNRS URA D1440 F-59651 Villeneuve Dascq France Dassault Elect F-92214 St Cloud France

ISBN: (纸本)3540633081

This paper describes an application of conceptual graphs in knowledge engineering. We are developing an assistance system for the acquisition and the validation of stereotyped behaviour models in human organizations. The system is built on a representation language requiring to be at expert level, to have a clear semantics and to be interpretable. The proposed language is an extension of conceptual graphs dedicated to the representation of behaviours. Tools exploiting this language are provided to assist the construction of behaviour models and their simulation on concrete cases.

关键词： Semantics

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