Modern computational methods combined with sound scientific knowledge permit building models providing accurate physical descriptions of complex phenomena. The resulting descriptions are useful not only in pure scientific research but also in applied fields like engineering, biology, meteorology and others. This book introduces the results of a Cambridge University research project in which several modelling techniques were applied to a real-life engineering problem, the description of the complete manufacturing process of a critical component for the automotive industry. The obtained model could then be used to better understand the governing parameters of the process and as a tool for its optimisation. Heat transfer physics,...
ISBN: 978-3-6390-6296-0
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Книга по требованию
Дата выхода: июль 2011
The knowledge of solid-liquid equilibrium (SLE) and availability of a validated computer based model is of great technical interest for developing and designing separation processes, such as crystallization and fractionation and solving industrial problems. The latest version of Statistical Associating Fluid Theory (SAFT), Perturbed Chain-SAFT (PC-SAFT), is very much successful for highly non-ideal macro-molecular weight system such as polymers. With the experimental SLE data available in literature for low molecular weight n-alkanes and aromatic compounds both at atmospheric and elevated pressure, the suitability of the developed SLE model based on PC-SAFT was tested. Subsequently sensitivity study was performed for polyethylene. The...
ISBN: 978-3-8383-1492-1
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Книга по требованию
Дата выхода: июль 2011
For manufacturers of high-tech multi-disciplinary systems such as semiconductor equipment, the effort required for integration and system testing is ever increasing, while customers demand a shorter time-to-market. This book describes how executable models can replace unavailable component realizations, enabling early integration and system testing. Using a range of model-based techniques, system level problems can be detected earlier, resulting in lower costs, less rework, and a shorter time-to-market. By coupling the models to the available component realizations in a real-time environment, the system level behavior can be tested months before the complete system is realized. An industrial application clearly shows the practical...
ISBN: 978-3-6390-6857-3
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Книга по требованию
Дата выхода: июль 2011
Frederic P. Miller, Agnes F. Vandome, John McBrewster
The Model 24 Stielhandgranate was the standard hand grenade of the German Army from the end of World War I until the end of World War II. The very distinctive appearance led to its being called a "stick grenade", or a "potato masher" in British Army slang, and is today one of the most easily recognized infantry weapons of the 20th century. Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.
ISBN: 978-6-1306-1303-7
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Книга по требованию
Дата выхода: июль 2011
A new two-phase model, to predict Electrical Submersible Pumps (ESP) head performance under two- phase flow conditions, including a set of one- dimensional mass and momentum balance equations was developed. A new shock loss model incorporating rotational speeds has been proposed. A new correlation, for drag coefficient and interfacial characteristic length effects, with rotational speed has been obtained through fitting the model results with Beltur (2003) and Zapata (2003) partial experimental data. The model predicts pressure and void fraction distributions along impellers and diffusers and also predicts the pump head performance under different fluid properties, pump intake conditions, and rotational speeds. The new two-phase model is...
ISBN: 978-3-8383-0896-8
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Книга по требованию
Дата выхода: июль 2011
Machining induced residual stress has been a research topic since the middle of the twentieth century. Experimental findings, analytical modelling, finite element modelling and various combinations of those have been proposed. Currently, computational models have great value in increasing the understanding of the cutting process and in reducing the number of experiments which traditionally are used for tool design, process selection, machinability evaluation, and virtual manufacturing. This work proposes a coherent and accurate study of the industrial process of machining pointing out the difficulties when considering a finite element model. An extensive work has been carried out comparing the numerical results which can be achieved...
ISBN: 978-3-6392-3997-3
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Книга по требованию
Дата выхода: июль 2011
Cement manufacturing is one of the most energy intensive processes requiring ~ 4 GJ/ ton of cement. Most of the energy consumption and production of carbon dioxide in cement manufacturing occurs in manufacturing of cement clinkers. It is therefore imperative to use recent advances in understanding of physics and computational methods to improve clinker manufacturing. This book takes first steps in that direction by discussing methodology and state of the art computational models to simulate clinker manufacturing. Aimed at practicing engineers and researchers, this book will give readers a capability to simulate rotary cement kilns and associated equipments. Considering the central role of kilns in clinker manufacturing, there is a...
ISBN: 978-3-6391-1219-1
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Книга по требованию
Дата выхода: июль 2011
Research in multibody systems has been growing rapidly in parallel with developments in computer sophistication since this has enabled complex real systems to be analysed more easily and quickly. One of the most difficult problems in modelling multibody systems is flexibility, which requires more simplifying assumptions than other phenomena. This monograph explains how homogenous transformations can be used to model kinematic chains with both rigid and flexible links. Flexible links are modelled using three approaches: both the classical and modified rigid finite element method as well as the modal method. Each of these methods is formulated in such a way that it is possible to generate the equations of motion for any system of rigid and...
ISBN: 978-3-8383-1040-4
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Книга по требованию
Дата выхода: июль 2011
The planar solid-oxide fuel cells (PSOFCs) have emerged as one of the promising candidates for future energy system because of their high energy efficiency, fuel flexibility, zero emission, modularity and high tolerance to the fuel impurities. However, for large-scale commercialization of the PSOFC technology, there is a strong need of developing a reliable and highly efficient PSOFC power system. Development of such a reliable PSOFC based power system requires knowledge of the several feedback effects from the power electronics system and the application loads that may impact the PSOFC stack and the system as a whole. Therefore, it is important to develop analytical methodologies to investigate and mitigate the effects of these...
ISBN: 978-3-6390-7942-5
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Книга по требованию
Дата выхода: июль 2011
Severe accidents (SA) in LWR occur when reactor vessel water decreases and there is no available water for core cooling. During SA the reactor core could, after partial/total melt down, pour into the lower plenum. The study of the interaction of melt fuel with water is the objective of MFCI (Melt Fuel Coolant Interaction). MFCI is an important issue in reactor safety . A SA can lead to energetic (steam explosion) or non-energetic (melt quenching) interactions in-vessel or ex-vessel. FARO facility at JRC-Ispra simulated MFCI experiments under real conditions. Pre-test/post-test analytical activities using COMETA code were carried out. The code was assessed based on FARO tests. Limitations and uncertainties in the application to a full...
ISBN: 978-3-8383-1108-1
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Книга по требованию
Дата выхода: июль 2011
Existing model reduction techniques for lower order controller design have certain limitations in terms of their applicability, reliability and accuracy. The main objective of this book is to present new tools that overcome these limitations for a large class of linear time invariant fixed and interval systems. This book presents two fold contributions for control system design problem. First, the improved model order reduction methods are described for linear time invariant fixed and interval systems. Second, suppose a reduced order controller is designed from the reduced order model for the original higher order system, it does not guarantee the stability of the resulting closed loop system. Thus, the problem of stabilization of the...
ISBN: 978-3-6391-5879-3
Издательство:
Книга по требованию
Дата выхода: июль 2011
Frederic P. Miller, Agnes F. Vandome, John McBrewster
High Quality Content by WIKIPEDIA articles! Le modelisme ferroviaire est une activite de modelisme concernant les trains et le monde ferroviaire, et tout particulierement leur reproduction suivant une echelle et un theme definis, ainsi que leur exploitation. Il s'agit de l'evolution du simple jeu avec un train miniature ou du fait de jouer au train electrique : le but de ce loisir technique et artistique est de constituer une maquette realiste sur laquelle les trains seront le sujet central. Le modelisme ferroviaire consiste alors, pour la plupart de ses pratiquants, a construire un reseau (parfois improprement appele « circuit ») amenage et decore, sur lequel le modeliste fera circuler ses trains. Данное издание не...
ISBN: 978-6-1318-3762-3
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Книга по требованию
Дата выхода: июль 2011
The main objective of the work reported in this monograph is the fabrication of an experimental apparatus to detect slowly evolving anomalies (i.e., decrease in stiffness due to fatigue failure) in complex mechanical systems at an early stage by observing time series data of the available ultrasonic and performance measuring sensors. The information on evolving anomaly will serve as an input to the life extending control policy that will, in turn, generate corrective actions to mitigate fatigue crack damage in the specimen structures and thereby extend the remaining life of the system without any significant loss in performance. The monograph presents the design requirements for the experimental testbed. Physical modeling gives out the...
ISBN: 978-3-6391-3212-0
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Книга по требованию
Дата выхода: июль 2011
The individual tree growth and yield models, such as stem taper, volume, biomass and height growth, play an important role in forest growth and yield prediction and projection systems. The reliability of a forest growth and yield system has been based on estimator characteristics such as consistency, efficiency and sufficiency. Recently, modeling techniques have received a great deal of attention in forest growth and yield modeling. This book, therefore, provides mathematical modeling approaches for stem taper, volume, biomass and tree height. Three modeling techniques of nonlinear least squares (NLS) regression, simultaneous fitting procedure (SUR), and nonlinear mixed-effects (NLME) modeling procedures were evaluated. This book will be...
ISBN: 978-3-6391-4237-2
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Книга по требованию
Дата выхода: июль 2011
A solar reactor consisting of a cavity-receiver containing an array of tubular absorbers is considered for the high temperature step of the zinc/zinc oxide thermochemical redox cycle using concentrated solar energy. The reactor is dimensioned, analyzed and optimized with the aim of maximizing efficiency and reaction conversion. 2D and 3D simulations of an 8kW reactor are implemented. Temperature distribution, reaction efficiency, tube efficiency and reaction conversion are analyzed to find the most promising reactor design. Additionally, basic knowledge in state of the art concentrating solar technology, design of experiments, radiative heat transfer, Mie theory, diffusion, reaction kinetics and in how to approach modeling tasks is...
ISBN: 978-3-6391-0013-6
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Книга по требованию
Дата выхода: июль 2011
The control of uncertain non-linear plants is a challenging task. Adaptive Fuzzy Controllers have been applied widely for the control of such processes. The book discusses one particular approach to the fuzzy controllers. Adaptive Model Free Fuzzy Control is a goal oriented approach which tries to control the plant based on the information available without specifically modeling the plant. The prime objective of the controller is to reduce the control error. The book discusses two different model free control structures and their relative merits and de-merits. Four different fuzzy identification schemes have been discussed which can be used to train the controller parameters. The simulation results from both the controllers have been...
ISBN: 978-3-6392-1676-9
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Книга по требованию
Дата выхода: июль 2011
Upon manufacturing plastics parts by extrusion or injection, polymers are plasticised in single screw units. The mechanisms involved in this process are complex and material, geometry and operation dependent. Usually, the setting of the extruder operating conditions or the establishment of the adequate screw geometry is based on trial-and-error. A more efficient method consists in determining the operating conditions or screw geometry that produces the desired performance, i.e. to solve the inverse problem. In this work a multi-objective optimization methodology based on genetic algorithms is proposed and used to perform an automatic optimization of the single screw polymer extrusion process. For that purpose a modelling package capable...
ISBN: 978-3-8383-2412-8
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Книга по требованию
Дата выхода: июль 2011
Effective scheduling of operations in the process industries has great potential for ensuring high economic returns. Traditionally, production scheduling problems in these industries have been solved using mathematical methods. The mathematical formulations, however, are still difficult to derive and severely inhibit the attainment of the potential economic benefits. Therefore, an alternative method for the formulation of scheduling problems in the process industries would be very helpful. In this study, the application of Petri nets for modelling and scheduling of batch processes has been investigated. Timed Place Petri nets were evaluated and found to be very promising for the formulation of scheduling problems in batch and mixed...
ISBN: 978-3-6390-2253-7
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Книга по требованию
Дата выхода: июль 2011
Typical intelligent mechatronic systems gather data and information from their technical environment using mullti-sensor systems.The data is then processed and interpreted finally leading to actions carried out by actuators.All these systems have reached a level of complexity that can only be mastered by an integrated system design strategy,using the combined knowledge from mechanics,electronics and software.The first step in the focused development is to carefully analyse the customer,s needs and the technical environment in which the future system is supposed to be integrated .The next step is to use elaborate ways of modeling and description methods to cover all subtasks of this system in an integrative matter Here the author,s...
ISBN: 978-3-6393-1420-5
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Книга по требованию
Дата выхода: июль 2011
This book examines the nature of structural complexity in manufacturing networks. Structural complexity is the information required to monitor manufacturing systems with specific focus on the systems that have a network structure and the effect of inter-dependency of components within the system on the performance. This research proposes novel structural complexity measures for a variety of management problems, i.e. routing, production status change, sequence disorder and buffer size variation. With the proposed measures, structural complexity can be applied to broader types of systems, i.e. series-parallel system, buffer system and rework system. In addition, a number of heuristic approaches are implemented in a computer program for re-...
ISBN: 978-3-6390-9742-9
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Книга по требованию
Дата выхода: июль 2011
This book introduces BlastSim – a physics-based simulation platform to model and simulate suicide bombing events. The BlastSim software is designed to test, analyze, and validate the results of different explosive and injury model combinations under various conditions with different sets of parameters, such as explosive and crowd formation characteristics, blockage and human shielding effects, fragmentation and shrapnel, and the bomber’s position in 2- and 3- dimensional environments. The suicide bombing event can also be re-created for forensic analysis. The number of fatalities and injured after a suicide bombing event can be predicted using this software with 91% accuracy. The assessment of an explosion’s effect on a crowd can...
ISBN: 978-3-6390-8956-1
Издательство:
Книга по требованию
Дата выхода: июль 2011
Frederic P. Miller, Agnes F. Vandome, John McBrewster
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Modelling clay is a malleable substance used in building and sculpting. Modelling clays have been used by man for thousands of years to produce pottery, buildings, and artistic sculptures. Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.
ISBN: 978-6-1338-0381-7
Издательство:
Книга по требованию
Дата выхода: июль 2011
Vacuum arc remelting (VAR) is a secondary melting process for production of metal ingots with elevated chemical and mechanical homogeneity for highly demanding applications. One of the most important problems of Vacuum Arc Remelting (VAR) is the lack of chemical homogeneity in the produced ingots. Past numerical studies of VAR have demonstrated that the characteristics of the mushy zone, the fluid flow and their interaction are the key factors defining the severity and the character of macrosegregation in the produced ingots. Thus, a new numerical model of the complete VAR process, capable of representing two distinctive morphologies of mushy zone: rigid columnar structure and slurry of free floating equiaxed grains is introduced. The...
ISBN: 978-3-8364-5948-8
Издательство:
Книга по требованию
Дата выхода: июль 2011