The current design of steel-concrete composite floors might be susceptible to resonance phenomenon, causing undesirable vibrations in the frequency range that is the most noticeable to humans, i.e. 4Hz to 8Hz. In addi...
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Green facades are passive living technologies applied to buildings. They produce many advantages for human wellbeing, building performance, and city environments. Knowledge of the energy behaviour of green facade syst...
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Green facades are passive living technologies applied to buildings. They produce many advantages for human wellbeing, building performance, and city environments. Knowledge of the energy behaviour of green facade systems is needed to inform their best design and application, and to define their energy performances. Heat and mass exchanges between the system and the surrounding environment must be determined. In this paper, the schematisation of the green facade system into layers and the energy balance approach are proposed. This study focuses on the analysis of the convective heat transfer occurring between the plant layer and the external air. It is difficult to realistically describe this mechanism and many approaches in the literature were considered. Six different formulae were evaluated. mathematicalmodelling and empirical data were both used. Once it was discovered that forced convection was the prevailing convective type, selected formulae were applied to the data, which were collected from an experimental green facade at the University of Bari. Based on the energy balance of the plant layer, a comparison between the calculated and measured values was carried out. Qualitative and quantitative statistical methods were used to assess the goodness -of-fit of the considered convective models. These analyses suggest the least and the most suitable approaches for convective heat transfer evaluation. The empirical equation of Morrison and Barfield and an adaptation to green facades of Deardorff model showed the best agreement. This study could be extended in order to write codes for building energy simulation software. (C) 2019 IAgrE. Published by Elsevier Ltd. All rights reserved.
This paper argues for the relevance of cognitive modelling and cognitive architectures to support user interface design decisions. From a humancomputer interaction point of view, cognitive modelling can have benefits ...
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The mathematical tool was used for a long time to model the dynamics of the populations, at present approach of modeling Multi-agents seem to be promising in the views of its capacity to master the complexity of the s...
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ISBN:
(纸本)9783642219993;9783642220005
The mathematical tool was used for a long time to model the dynamics of the populations, at present approach of modeling Multi-agents seem to be promising in the views of its capacity to master the complexity of the studied systems. In this work we try to model the population of cells occurring during the infection by the virus of the human immunodeficiency (HIV) to show the efficiency of the approach Multi-agents by comparing with the mathematical approach. The obtained results allowed to bring to light the behaviour and the interactions between the various cells studied in agreement with the biological reports.
modelling the behaviour of metal alloys during their thermo-mechanical processing relies on the physical and mathematical description of numerous phenomena occurring in several space scales and evolving on different c...
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ISBN:
(纸本)9783038351061
modelling the behaviour of metal alloys during their thermo-mechanical processing relies on the physical and mathematical description of numerous phenomena occurring in several space scales and evolving on different characteristic times. Although it is possible to develop complicated multi-scale models, it is often simpler to simulate each phenomenon separately in a single-scale model and link all the models together in a global structure responsible for their good interaction. Such a structure is relatively difficult to design. Both efficiency and flexibility must be well balanced, keeping in mind the character of scientific computing. In that context, the Agile Multiscale modelling Methodology (AM3) has been developed in order to support the object-oriented designing of complex numerical models [1]. In this paper, the application of the AM3 for designing a model of the metal alloy behaviour is presented. The basis and some consequences of the application of the Object-Oriented design of a sub-models structure are investigated. The object-oriented (OO) design of a 3 internal variables model of the dislocations evolution is presented and compared to the procedural one. The main advantages and disadvantages of the OO design of numerical models are pointed out.
One way to understand a neurobiological system is by building a simulacrum that replicates its behaviour in real time using similar constraints. Bionic eye helps visually impaired people. A neuromorphic system concept...
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One way to understand a neurobiological system is by building a simulacrum that replicates its behaviour in real time using similar constraints. Bionic eye helps visually impaired people. A neuromorphic system concepts and circuit design method involved is discussed in this paper. The mathematical model has been simulated and validated in MATLAB using artificial stimulus. A photoreceptors circuit realised and simulated using analogue mixed-signal VLSI behavioural modelling. The estimated parameters using the mathematical model are incorporated in behavioural model to describe neuromorphic retinal system topology and performance. The behavioural models hold up the signal flow correlation between input and outputs. A one-dimensional hardware photoreceptors circuit was constructed and the performance is studied under the steady state condition, tested with impulses or step input that simulates the physical dynamics of the biological system using VHDL-AMS which illustrate the specific features of system level design. Finale future scopes are also presented evidently.
Due to information processing constraints and cognitive limitations, humans necessarily form limited representations of complex visual stimuli when making utility-based decisions. However, it remains unclear what mech...
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The new oil-pressure damper is installed with an additional Relief Valve parallel to the Throttle Valve to change its aperture size. This is intended to obtain the adaptive control by changing the damping coefficient ...
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This paper presents the mathematicalmodelling and control system design of an autonomous bicycle. The nonlinear equations of motion have been derived and the proposed control system has been used in the simulation of...
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This paper presents the mathematicalmodelling and control system design of an autonomous bicycle. The nonlinear equations of motion have been derived and the proposed control system has been used in the simulation of the dynamical behaviour of the bicycle. With the assumption of rolling without slipping condition for the wheels-ground interaction, the system is constrained by nonholonomic equations, and the equations of motion are highly nonlinear. Unlike many other approaches present in related literature, the dynamical model is preserved in simulations in its original nonlinear form without any simplifying assumptions and linearization. Numerical results of the simulations show that the proposed closed-loop control system is achievable. Design of the experimental system has been based on a commercially available bicycle. The mechanical modifications and control system hardware have been designed according to the simulation results.
Purpose - In order to assess the performance of an induction generator in standalone wind power application, it is imperative that mathematical models are developed that accurately represent the system and take into a...
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Purpose - In order to assess the performance of an induction generator in standalone wind power application, it is imperative that mathematical models are developed that accurately represent the system and take into account various electromagnetic influences such as skin effect. The purpose of this paper is to utilize mathematical models to study the transient and steady-state behaviour of the self-excited induction generator (SEIG), in one case with an aluminum rotor, in another case, with a copper rotor, under various load conditions while taking the above factor into account. Design/methodology/approach - mathematical models of a SEIG in the d-q axis frame have been developed based on the generalized machine theory. A relationship between the mutual inductance and the magnetizing current of the machine has been presented. The rotor impedances have been customized to include skin effect. Using these relations, the model has been extended to include the saturation and skin effects. In order to verify the accuracy of the models, numerical and experimental investigations have been carried out on two 7.5 hp aluminum-rotor and copper-rotor SEIGs. Findings - It was found that the model that takes into account the saturation and skin effects produces numerical results that closely match experimental values for both the machines. Originality/value - This paper describes how a model of an SEIG considering saturation and skin effect has been developed and applied to aluminum- and copper-rotor machines of similar power ratings to analyze their performance.
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