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Books > Professional & Technical > Mechanical engineering & materials > Production engineering > Industrial quality control
Of the more than $300 billion spent on plant maintenance and operations, U.S. industry spends as much as 80 percent of this amount to correct chronic failures of machines, systems, and people. With machines and systems becoming increasingly complex, this problem can only worsen, and there is a clear and pressing need to establish comprehensive equipment management programs that incorporate the diverse considerations that are essential to effective maintenance.
Signifikante Potenziale zur Optimierung der Produktqualitat und Effizienz koennen bei etablierten Fertigungsverfahren nur erkannt werden, wenn der gesamte Herstellungsprozess sowohl unter technologischen als auch unter logistischen Gesichtspunkten untersucht wird. Um nachhaltige Erfolge zu erzielen mussen radikale Veranderungen der Prozesskette, wie beispielsweise der Einsatz von innovativen und wirtschaftlich risikoreichen Fertigungsverfahren oder die vollstandige Umgestaltung der bekannten Prozessketten, in Betracht gezogen werden. Durch prozessubergreifend abgestimmte technologische sowie logistische Massnahmen koennen so bisher unbekannte und ungenutzte Optimierungspotenziale auch bei etablierten und hochgradig optimierten Einzelprozessen gewinnbringend genutzt werden. Vor diesem Hintergrund beschaftigt sich das vorliegende Werk mit der Vorstellung und detaillierten Untersuchung der Prozesskette zur Herstellung von prazisionsgeschmiedeten Hochleistungsbauteilen, sowohl unter technologischen als auch logistischen Aspekten. Fur die Einzelprozesse der Prozesskette wird der aktuelle Stand der Forschung und Technik beschrieben und darauf aufbauend eine prozessubergreifende Technologieentwicklung vorgestellt.
Technische Produkte benotigen zuverlassige Software, fur die hohe Qualitatsmassstabe gelten. Fur eingebettete Software ist die Beherrschung qualitatssichernder Entwicklungsprozesse notwendig, um einen bestandigen wirtschaftlichen Erfolg zu erreichen. Dabei mussen im gesamten Entwicklungszyklus Fehler vermieden werden, eine fruhzeitige Fehlererkennung und - beseitigung ist sicherzustellen. Hier werden speziell dafur entwickelte Methoden zur Qualitatssicherung vorgestellt, strukturiert und bewertet sowie in ein qualitatsorientiertes Vorgehensmodell integriert."
Early and accurate fault detection and diagnosis for modern chemical plants can minimise downtime, increase the safety of plant operations, and reduce manufacturing costs. The process monitoring techniques that have been most effective in practice are based on models constructed almost entirely from process data.The goal of the book is to present the theoretical background and practical techniques for data-driven process monitoring. Process monitoring techniques presented include: Data-driven methods - principal component analysis, Fisher discriminant analysis, partial least squares and canonical variate analysis; Analytical Methods - parameter estimation, observer-based methods and parity relations; Knowledge-based methods - causal analysis, expert systems and pattern recognition.The text demonstrates the application of all of the data-driven process monitoring techniques to the Tennessee Eastman plant simulator - demonstrating the strengths and weaknesses of each approach in detail. This aids the reader in selecting the right method for his process application. Plant simulator and homework problems in which students apply the process monitoring techniques to a non-trivial simulated process, and can compare their performance with that obtained in the case studies in the text are included. A number of additional homework problems encourage the reader to implement and obtain a deeper understanding of the techniques. The reader will obtain a background in data-driven techniques for fault detection and diagnosis, including the ability to implement the techniques and to know how to select the right technique for a particular application.
The past decade has witnessed an increasing interest in observers for nonlinear systems. This subject is relevant in different contexts such as synchronization of complex dynamical systems, fault detection and isolation, and output feedback control. This book contains the contributions that are to be presented at the workshop "New Directions in Nonlinear Observer Design", to be held from June 24-26, 1999, in Geiranger Fjord, Norway. The workshop has been organised by Olav Egeland, Thor I. Fossen and Henk Nijmeijer; it will include participants from Africa, Asia, Europe and USA and it will focus on recent developments in the above mentioned areas. The contributions form a good review of present achievements and challenges in nonlinear observer design. The workshop is supported by the Strategic University Program on Marine Cybernetics at the Norwegian University of Science and Technology and ABB.
The series Advances in Industrial Control aims to report and encourage technology transfer in control engineering. The rapid development of control technology impacts all areas of the control discipline. New theory, new controllers, actuators, sensors, new industrial processes, computer methods, new applications, new philosophies..., new challenges. Much of this development work resides in industrial reports, feasibility study papers and the reports of advanced collaborative projects. The series offers an opportunity for researchers to present an extended exposition of such new work in all aspects of industrial control for wider and rapid dissemination. The environmental aspects of all of our society's activities are extremely important if the countryside; the sea and wildernesses are to be fully enjoyed by future generations. Urban waste in all its manifestations presents a particularly difficult disposal problem, which must be tackled conscientiously to prevent long lasting damage to the environment. Technological solutions should be seen as part of the available options. In this monograph, the authors M. R. Katebi, M. A. Johnson and J. Wilkie seek to introduce a comprehensive technological framework to the particular measurement and control problems of wastewater processing plants. Of course the disposal of urban sewage is a long-standing process but past solutions have used options (disposal at sea) which are no longer acceptable. Thus to meet new effluent regulations it is necessary to develop a new technological paradigm based on process control methods, and this is what the authors attempt to provide.
The presence of considerable time delays in many industrial processes is well recognized and achievable performances of conventional unity feedback control systems are degraded if a process has a relatively large time delay compared to its time constants. In this case, dead time compensation is necessary in order to enhance the performances. The most popular scheme for such compensation is the Smith Predictor, but it is unsuitable for unstable or lightly damped processes because the compensated closed-loop system always contains the process poles themselves. An alternative scheme for delay elimination from the closed-loop is the finite spectrum assignment (FSA) strategy and it can arbitrarily assign the closed-loop spectrum. One may note that the Smith Predictor Control can be found in delay systems control books and many process control books, but the FSA control is rarely included in these books. It is therefore timely and desirable to fill this gap by writing a book which gives a comprehensive treatment of the FSA approach. This is useful and worthwhile since the FSA provides not only an alternative way but also certain advantages over the Smith-Predictor. The book presents the state-of-the-art of the finite spectrum assignment for time-delay systems in frequency domain. It mainly contains those works carried out recently by the authors in this field. Most of them have been published and others are awaiting publication. They are assembled together and reorganized in such a way that the presentation is logical, smooth and systematic."
H... control theory is a subject that deals with the minimisation of the H... norm of the transfer matrix from an exogenous disturbance to a pertinent controlled output of a given plant. H... Control and Its Applications examines both the theoretical and practical aspects of H... control from the angle of the structural properties of linear systems. Constructive algorithms for finding solutions to general singular H... control problems are presented, as well as solutions to general H... almost disturbance decoupling problems, and the applications of the theory to real-life problems with actual implementations is also presented. The book deals with all such issues for general continuous - and discrete-time systems. The book can be used in graduate courses in departments of aeronautics and astronautics, applied mathematics, chemical engineering, electrical engineering and mechanical engineering. It is also invaluable for practising engineers in industry.
Orthogonal Functions may be divided into two classes. The class of continuous systems and the discontinuous class of piecewise constant systems. Problems arise because continuous systems form an unsatisfactory basis for the expansion of functions containing discontinuities whilst piecewise constant systems insert artificial discontinuities into all representations. Since these two classes of functions would be unsuccessful in coping with functions that possess both continuity and discontinuity we must look to General Hybrid Orthogonal Functions (GHOF) which have been shown to be the most appropriate in such situations. This book introduces the system of GHOF, discusses its properties, develops an operational algebra for the discretization of continuous dynamic systems on the system of GHOF and illustrates its use as a flexible and powerful framework of computational tools in a wide range of systems and control.
This book documents the scientific outcome of the Third
International Workshop on Hybrid Systems, held in Ithaca, NY, USA,
in October 1994. It presents a selection of carefully reviewed and
revised full papers chosen from the workshop contribution and is
the successor to LNCS 736, the seminal "Hybrid Systems" volume
edited by Grossman, Nerode, Ravn, and Rischel.
The behaviour of steel structures and the criteria used in their design are set out in detail in this book. The book bridges the gap between the methods of analysis and the sizing of structural components. The basis of the limit state design criteria of the latest Australian code for structural steel are explained, and the reader is pointed to the relevant provisions of the code.
From the viewpoint of an "industrial" this book is most welcome, as one of the most significant demonstrations of the maturity of Prolog. Logic programming is a fascinating area in computer science, which held for years - and still does - the promise of freeing ourselves from programming based on the "Von Neumann" machine. In addition computer programming has long been for solid theoretical foundations. While conventional engineering, dealing mainly with "analogical complexity," developed over some hundred years a complete body of mathematical tools, no such toolset was available for "digital complexity." The only mathematical discipline which deals with digital complexity is logic and Prolog is certainly the operational tool which comes closest to the logical programming ideal. So, why does Prolog, despite nearly twenty years of development, still appear to many today to be more of a research or academic tool, rather than an industrial programming language? A few reasons may explain this: First, I think Prolog suffers from having been largely assimilated into - and thus followed the fate of - Artificial Intelligence. Much hype in the late 1980 created overexpectations and failed to deliver, and the counterreaction threw both AI and Prolog into relative obscurity. In a way, maybe this is a new chance for the Prolog community: the ability to carry out real work and progress without the disturbance of limelights and the unrealistic claims of various gurus. Second, programming in Prolog is a new experience for computer professionals.
This monograph was motivated by a very successful workshop held before the 3rd IEEE Conference on Decision and Control held at the Buena Vista Hotel, lake Buena Vista, Florida, USA. The workshop was held to provide an overview of polynomial system methods in LQG (or H ) and Hoo optimal control and 2 estimation. The speakers at the workshop were chosen to reflect the important contributions polynomial techniques have made to systems theory and also to show the potential benefits which should arise in real applications. An introduction to H2 control theory for continuous-time systems is included in chapter 1. Three different approaches are considered covering state-space model descriptions, Wiener-Hopf transfer function methods and finally polyno mial equation based transfer function solutions. The differences and similarities between the techniques are explored and the different assumptions employed in the solutions are discussed. The standard control system description is intro duced in this chapter and the use of Hardy spaces for optimization. Both control and estimation problems are considered in the context of the standard system description. The tutorial chapter concludes with a number of fully worked ex amples."
The operation of process plants involves a large number of event-driven activities, such as the start-up and shut-down of the plant, the execution of emergency procedures and equipment interlocking. These activities are normally carried out by procedural control systems (such as PLCs or DCSs). Despite the extent to which these control systems are used in practice, limited theoretical frameworks exist to support their analysis and design. This is particularly relevant in flexible production environments which are characterised by frequent changes in the product recipes, production modes and equipment configuration. The book outlines a formal framework for the synthesis of control systems employed in the automation of event-driven process operations. The approach used builds on other theories initially proposed in computing and control disciplines.
A fundamental problem in control theory is concerned with the
stability of a given linear system. The design of a control system
is generally based on a simplified model. The true values of the
physical parameters may differ from the assumed values.
In Object Recognition through Invariant Indexing, Charles Rothwell provides a practical and accessible introduction to two-dimensional shape description using projective invariants while contrasting the various interpretations of the descriptors currently in use. He also surveys a number of new invariant descriptors for three-dimensional shapes that can be recovered from single images, showing how such measures can be used to ease the recognition of real objects by a computer. Rothwell then proceeds to describe a promising new architecture for a real recognition system. In reviewing a broad field of recognition theory, the book is unique in its deft synthesis of research and application. It will be welcomed by students and researchers in computer vision, robotics, pattern recognition, and image and signal processing.
All packaging engineers and technologists who want to ensure that
they give their customers the highest quality, most cost-effective
products should know that the paradigm has shifted. It has shifted
away from the MIL-STDs and other government standards and test
procedures that don't cost-effectively address potential failure
mechanisms or the manufacturing processes of the product. It has
shifted decisively towards tackling the root causes of failure and
the appropriate implementation of cost-effective process controls,
qualityscreens, and tests. A wide range of microelectronic package and interconnect
configurations for both single-and multi-chip modules is examined,
including chip and wire-bonds, tape-automated (TAB), flip-TAB,
flip-chip bonds, high-density interconnects, chip-on-board designs
(COB), MCM, 3-D stack, and many more. The remaining package
elements, such as die attachment, case and lid, leads, and lid and
lead seals are also discussed in detail.
The food industry is in the process of adapting itself more strongly than previously to the demands and needs for quality products. Tightening up the legal framework of conditions and the internationalization of the markets are compelling a further development of concern over quality and its purposeful application. The 13th International Conference on Biochemical Analysis organized a workshop together with the International Society of Animal Clinical Biochemistry (ISACB) within the framework of "Analytica 1992" in Munich to come to grips with this complex of problems. This workshop should reinforce the awareness and motivation for the new responsibilities of analytical chemistry and contribute to the integration of biochemical methods as part of a comprehensive quality control concept in the production of foodstuffs of animal origin. These methods include preventive medical checkups on the living animal, the monitoring of deleterious factors in its environment, as well as analysis of residues in its feed and the actual food. The aim of this workshop was: - to intensify the dialogue between applied research, development, and utiliza tion, - to demonstrate the new opportunities that analytical chemistry has to offer and to prepare the way for their introduction, - to show new methods, concepts, and prototypal developments - to draw conclusions from trends and tendencies, as well as future requirements."
There is now a widely accepted view among manufacturing and service organisations that 'operations' can provide the means of achieving competitive edge. The OMA-UK Sixth International Conference has taken this view as its theme and focuses in particular on how technology and people can be used to improve manufacturing and service competitiveness. These proceedings have been organised according to the topics addressed within the overall conference theme and generally fall within three broad areas: technology-based topics, human resource-based topics and general topics. The technology-based topics are: Materials Control, Supply Chain Management and Logistics Flexibility in Operations Systems Computer-Aided Management of Operations Design, Process Planning and 'Time to Market' Factors Application of KBS, Expert Systems and Modelling Production Planning and Control The human resource-based topics are: Work Organisation Human Factors Managing the Implementation of Technology Managing the Quality Improvement Process Education Training and Development Employee Participation and Involvement The general topics are: Operations Strategy International Comparisons and Country-based Papers Performance and Productivity Measurement and Improvement A particular feature of all the papers is that they emphasise the application of techniques, technologies and concepts rather than concentrating on specific functional description. The authors are drawn from around 14 countries and represent both the academic and industrial communities. Many are involved in the 'mainstream' of operations management while a number are from other disciplines relevant to the conference theme, such as industrial engineering and organisational behaviour.
This thesis deals with timing and sizing decisions for production lots, and more precisely, with mathematical models to support optimal tim ing and sizing decisions. These models are called lotsizing models. They are characterized by the fact that production lots are determined based on a trade-offbetween production costs and customer service. Production costs can be categorized as basic production costs, which consist of material costs, labour costs, machine startup costs and over head costs, and inventory related costs, which include costs of capital tied up in inventory, insurances and taxes. Customer service is the capability of the firm to deliver to their clients the products in the quantity they ordered at the agreed upon time and place. The costs of realizing a certain service level are usuaIly very dif ficult to convert into money. They include costs of expediting, loss of customer goodwill, and loss of sales revenues resulting from the short age situation."
ecision making is one of the most important activities in both our profes D sional and our private lives today. The literature on the subject has grown considerably over the last fifty years and it now covers many different approaches to the subject. These approaches range from that of creating a mathematical model of the decision situation under consideration, as in operations research and other forms of mathematical decision analysis, to those that are based on human and organizational behavior. Recently, those working in the field have begun to combine approaches to the study of decision situations that arise in organizations, in our personal lives and in the communities in which we live. This book is an attempt to assist those concerned with decision making to work with this combination of approaches. In the past, decision problems have been considered according to the condi tions under which they arise and to some extent in terms of the approaches available for their resolution. Writers on the subject who are mathematically oriented have devised a method of classifying decisions based on the type of mathematics that they suggest be used in the resolution of the problems. This approach leads to the division of decision situations into the categories of cer tainty, uncertainty, risk and competition. Deterministic models available in oper ations research have then been offered as the means of treating decision situations in the category of certainty."
Internal auditing is an essential tool for managing compliance and for initiating and driving continual improvement in any organization’s systematic HSEQ performance.
The Fifth IFIP Working Conference on Stochastic Differential Systems continues the traditional line of previous conferences in Kyoto (1976), Vilnjus (1978), Visegrad (1980), and Marseille-Luminy (1984) and focuses on topics of present research in the field of stochastic differential systems. Particular emphasis is laid on infinite-dimensional stochastic problems and random fields, especially on stochastic partial differential equations. The volume includes contributions to the study of stochastic equations and diffusion and their approximation, large deviations and stability of perturbed systems, stochastic control theory and filtering. There are also contributions to the study of some special problems in martingale theory and stochastic calculus. This volume is of special interest to researchers in stochastic processes, random fields, and control theory. |
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