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- Berbyuk, Viktor, 1953
(författare)
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Structural Dynamics Control, Third Edition
- 2020
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Structural dynamics and especially one of its main problems, vibrations and vibration control, appear in vehicle engineering, high precision machines and mechanisms, robotics, civil engineering, wind turbines, biomechanics, and others. Over the last decades there has been much work concerned with the vibration control of different dynamical systems. The texbook “Structural Dynamics Control” aims at providing knowledge on modern methods and concepts of passive, semi-active and active vibration control, to cross the bridge between structural dynamics and control engineering, while providing an overview of the potential of smart materials, (magnetorheological fluids, magnetostrictive materials, and others), for sensing and actuating purposes in active vibration control. One of the aims of this textbook is to provide students and engineers with opportunity of becoming familiar with the standard methods of the classical calculus of variations, the linear quadratic regulator optimization methods, and modern optimal control theory with focus on their applications in structural dynamics for vibration attenuation and vibration suppression problems. The textbook consists of four main parts: Vibration dynamics, Passive and semi-active vibration control, Active and hybrid vibration control, and Applications. The textbook ends with the supplementary mathematics, list of Matlab codes and answers and hints for the exercises. The list of references consists of only those books and scientific papers which were used during preparation of the textbook or which have been recommended to stundents for additional information on a studied topic. The textbook is aimed at first towards graduate and postgraduate students following Master and PhD programmes related to structural dynamics, mechatronics, control engineering, automotive engineering, noise and vibrations. The only prerequisite for reading this book is basic knowledge in mechanics and some familiarity with vibrations, state space models and automatic control.
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| 2. |
- Berbyuk, Viktor, 1953
(författare)
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Structural Dynamics Control
- 2012
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- The objective in writing this textbook was to help students wishing to get deeper knowledge on structural dynamics and vibration control, while providing an overview of the potential of smart materials based sensor and actuator technologies for active vibration control. The textbook consist of four main parts: Vibration dynamics (Part 1), Passive and semi-active vibration control (Part 2), Active and hybrid vibration control (Part 3), and Applications (Part 4). The textbook ends with the supplementary mathematics, list of Matlab codes and answers and hints for the exercises. The Part 1 consists of Chapter 2 and Chapter 3. In Chapter 2 we present three approaches, which are usually used for developing of mathematical models of vibration dynamics of mechanical systems. These approaches are: free-body diagram, energy method and Lagrange formalism. Chapter 3 is devoted to elements of vibration dynamics analysis. The focus is set primarily on simple and widely recognizable vibrating mechanical systems. Attention is paid to analysis of vibration dynamics under harmonic excitations, transmissibility and vibration isolation. Vibration dynamics of a mechanical system can be affected by changing the initial state, or/and by changing the system’s structural/design parameters, or/and by varying the external force/torque excitations acting on the system. This type of problems is considered in the Part 2 of the textbook which is called “Passive and semi-active vibration control”. In many cases mechanical systems are inherently stable to begin with, and external control is applied to improve the performance. But, unfortunately, the introducing the active control, let say for vibration control by using feedback control, can often make the system unstable. In Chapter 5 the elements of the theory of stability to be used for designing of active vibration control strategies making the closed loop vibrating system stable, are presented. Chapter 6 presents several details of physical and mathematical representations of feedback control. Some important properties of a system to be controlled such as controllability and observability are defined and discussed.In Chapter 7 semi-active vibration control problems are considered. Some well-known semi-active control strategies based on skyhook approach are presented. A brief overview of magnetorheological (MR) fluids technology including modelling of MR dampers is presented and their applications for semi-active control are discussed. The Part 3 of the textbook is called “Hybrid and active vibration control”. It consists of Chapters 8 - 9. Chapter 8 presents several approaches and methods for designing of optimal control laws and algorithms for vibration attenuation and vibration suppression. Focus is put on linear quadratic regulator (LQR) optimization technique, the calculus of variations approaches, the methods which are used first integrals of a vibrating system to be controlled, and the method for optimal vibration control based on Pontryagin maximum principle. Chapter 9 presents the elements of theory of hybrid control techniques. A mathematical statement of the optimal control problem which is suitable for modelling of controlled motion and optimization of semi-passively actuated mechanical systems is proposed. A methodology and numerical algorithms for solving the control and optimization problems for semi-passively actuated mechanical systems are described. Special emphasis is put on the study of controlled mechanical systems having different degrees and types of actuation (underactuated and overactuated systems, external powered drives, unpowered spring-damper like drives, etc.). The Part 4 of the textbook is called “Applications” and comprises Chapters 10 –13. The Chapter 10 deals with application of smart materials, namely giant magnetostrictive materials, for power harvesting from vibration. In the Chapter 11 the engineering and computational models of a washing machine are described and structural dynamics analysis of the system is presented and briefly discussed. The dynamical behavior of railway vehicles is an active area of research. Recent activities are focused on improvements of train-set performance with focus on cost efficiency of railway operation, safety, comfort and environment impact. In Chapter 12 we give a brief overview of the results obtained and on-going research on structural dynamics and control of railway vehicles at the Mechanical systems group at Chalmers. In recent years wind energy has been a fast growing source of electrical power. In the Chapter 13 we outline challenges and motivations in research and developing in wind turbine technology as well as present some results on structural dynamics of drive train system of wind turbines. The textbook ends with the Supplementary mathematics, List of Matlab codes and Answers and hints for the exercises.
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| 3. |
- Berbyuk, Viktor, 1953
(författare)
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Vibration Dynamics and Control
- 2010
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Over the last decades there has been much work concerned with the vibration control of different dynamical systems. The objective in writing this textbook was to help students wishing to get deeper knowledge on structural dynamics and vibration control, while providing an overview of the potential of smart materials based sensor and actuator technologies for active vibration control. The textbook is aimed at first towards graduate and postgraduate students following Master and PhD programmes related to structural dynamics, mechatronics, control engineering, automotive engineering noise and vibrations. The only prerequisite for reading this book is some background in structural dynamics and in automatic control. The contents of the textbook consist of five parts: Vibration dynamics (Part 1), Passive and semi-active vibration control (Part 2), Active and hybrid vibration control (Part 3), Applications (Part 4), and Supplementary mathematics, List of Matlab codes and Answers and hints for the exercises (Part 5).The Part 1 of the textbook is called “Vibration dynamics”. It consists of Chapter 2 and Chapter 3. In Chapter 2 we present three approaches, which are usually used for developing of mathematical models of vibration dynamics of mechanical systems. These approaches are: free-body diagram approach, energy method and Lagrange formalism. Chapter 3 is devoted to elements of vibration dynamics analysis. The focus is set primarily on simple and widely recognizable vibrating mechanical systems. Attention is paid to analysis of vibration dynamics under harmonic excitations, transmissibility and vibration isolation. Some specific properties and phenomena that occur in nonlinear vibrating systems (like parametric resonance) are discussed.Vibration dynamics of a mechanical system can be affected by changing the initial state, or/and by changing the system’s structural/design parameters, or/and by varying the external force/torque excitations acting on the system. This type of problems is considered in the Part 2 of the textbook which is called “Passive and semi-active vibration control”. The Part 2 consists of Chapters 4 - 7. In Chapter 4 we consider so-called passive vibration control (PVC) problems. To this class belong the control problems dealing with determination of the initial state of the system or/and its structural (design) parameters which together with given external force/torque excitations guarantee prescribed (desirable) properties of vibration dynamics of the considered system. Dynamics of undamped as well as damped vibrating systems with tuned mass dampers are studied and analyzed. In many cases mechanical systems are inherently stable to begin with, and external control is applied to improve the performance. But, unfortunately, the introducing the active control, let say for vibration control by using feedback control, can often make the system unstable. Thus analysis of stability of the vibrating system after a control strategy is designed and applied to the system is an important step in engineering practice. In Chapter 5 the elements of the theory of stability which can be used for designing of active vibration control strategies which make the closed loop vibrating system stable, are presented.It is desirable to design active vibration control which uses real-time measurement data as a response of a system in question. In this case the control is mathematically represented as a function of parameters of the system response, e.g. as a function of positions and/or velocities. Such a control is called feedback control. Chapter 6 presents several details of physical and mathematical representations of feedback control. Some important properties of a system to be controlled such as controllability and observability are defined and discussed.In Chapter 7 we consider semi-active vibration control problems. The semi-active vibration control method is defined here as an approach which gives possibility to change damping or/and stiffness properties of functional components of a system, e.g., damping or/and stiffness coefficients of shock absorbers, and in this way to control vibration dynamics of the system in question. Some well-know semi-active control strategies based on skyhook approach are presented. A brief overview of magnetorheological (MR) fluids technology including modelling of MR dampers is presented and their applications for semi-active control are discussed. The Part 3 of the textbook is called “Hybrid and active vibration control”. It consists of Chapters 8 - 9. Chapter 8 presents several approaches and methods for designing of optimal control laws and algorithms for vibration attenuation and vibration suppression. Focus is put on LQR optimization technique, the calculus of variations approaches, the methods which are used first integrals of a vibrating system to be controlled, and the method for optimal vibration control based on Pontryagin maximum principle.The term hybrid control generally refers to a combined passive and active control system. Since a portion of the control objective is accomplished by the passive system, less active control effort, implying less power, is required. A side benefit of hybrid and semi-active control systems is that, in the case of a power failure, the passive components of the control still offer some degree of control, unlike a fully active control system.Chapter 9 presents the elements of theory of hybrid control techniques. A mathematical statement of the optimal control problem which is suitable for modelling of controlled motion and optimization of semi-passively actuated mechanical systems is proposed. A methodology and numerical algorithms for solving the control and optimization problems for semi-passively actuated mechanical systems are described. Special emphasis is put on the study of controlled mechanical systems having different degrees and types of actuation (underactuated and overactuated systems, external powered drives, unpowered spring-damper like drives, etc.). The solutions of energy-optimal control problems are presented for different kinds of semi-passively actuated multibody systems (closed-loop chain semi-passively actuated robot, multibody system modelled the human locomotor apparatus with above-knee prosthesis). The methodology and numerical algorithms described and implemented for particular control problems are also suitable for design of energy efficient active vibration control algorithm for nonlinear vibration mechanical systems. The Part 4 of the textbook is called “Applications”. Here a brief overview is given of the research on vibration dynamics and control performed at the Mechanical systems group of the division of Dynamics, department of Applied Mechanics, Chalmers University of Technology. The focus is on current doctoral projects which are related to vibration dynamics and control problems having applications in high speed train industry, automotive engineering, home appliances design and smart material based power harvesting from vibrations.During the last decades interest in research and development of smart actuators, sensors and power generators that use giant magnetostrictive materials has been continually growing. Both academia and industry are actively looking for broad utilization of this technology for different applications (active vibration and noise control, structural health monitoring, self-powered electronic equipments and systems, MEMS, robotics, biomedical engineering, etc.). Recent developments in miniaturized sensors, digital processors, self-powered electronics and wireless communication systems have many desirable applications. The realization of these applications however, is limited by the lack of a similarly sized power sources. Powering the above mentioned systems can be a significant engineering problem, as traditional solutions such as batteries are not always appropriate. The one issue that still needs to be resolved is a method to generate sufficient energy to power the electronics. The Chapter 10 deals with application of smart materials, namely giant magnetostrictive materials, for power harvesting from vibration. Mathematical modelling and design of magnetostrictive electric generators (MEG) are considered. A mathematical model, physical prototype of MEG and test rig have been developed for simulation and experimental study of conversion of mechanical energy of vibration into electrical energy using Terfenol-D as an active material. Simulation and experimental results have confirmed functionality of the designed MEG. The textbook ends with the Part 5 which comprises Supplementary mathematics, List of Matlab codes, and Answers and hints for the exercises.List of references consists of only those books and scientific papers which were used during preparation of the textbook or which were recommended for additional information on a studied topic.
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| 4. |
- Larsson, Lars, 1945, et al.
(författare)
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Principles of Yacht Design (4th ed.)
- 2013
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- The first edition of the Principles of Yacht Design was published in 1994. Since then there have been two new editions, and the book has been translated into German, Japanese and Korean. A special edition is published in the United States. The book has thus been very well received, and in this fourth edition we have kept the structure and the main contents of the previous editions. The basic idea is to cover all aspects of yacht design, from the specification, through the hydro- and aerodynamic design, structural assessment and layout, to the final evaluation. Emphasis is placed on concept descriptions, but formulae, separated from the text, are included in sufficient depth for a complete design of a new yacht. An important feature of the book is the example yacht, used throughout the book to exemplify the use of the formulae. This is where the present edition differs most from the previous ones. A completely new modern performance cruiser, the YD–41 has replaced the original YD-40, designed for the first edition. This has called for a revision of most of the figures and important parts of the text. In connection with the new design, the statistics found in the design chapters have been completely revised, and are now based on yachts designed during the past ten years. The primary designer of the new yacht is Michal Orych, who is now welcomed as the third author of the book.Since the first edition there have been regular updates particularly in two areas: hydrodynamic formulas based on the Delft systematic yacht hull series (DSYHS), and ISO standards for the safety and structural integrity of sailing yachts. The authors are indebted to Dr Lex Keuning, the manager of DSHYS, for his advice in this matter. The ISO 12217-2 seaworthiness standard was developed under the chairmanship of Andrew Blyth, and the ISO scantlings standard 12215 under the late Fritz Hartz and more recently Gregoire Dolto. Thanks are due to all of them for their support, and for their permission to use unpublished parts of the standards. In the present edition, new resistance formulae are presented from DSHYS, and the ISO 12215 standard has been updated with respect to rudders and appendages.Since the first edition there has been a dramatic development in Computational Fluid Dynamics (CFD), and this is reflected in the present edition, where a considerably expanded section in the last chapter is devoted to this exciting technique.
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| 5. |
- Larsson, Lars, 1945, et al.
(författare)
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Principi di Yacht Design (in Italian)
- 2022
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Principles of Yacht Design has established itself as the standard book on the subject for practising designers, naval architecture students, discerning boat owners as well as the boatbuilding industry as a whole. The fifth edition is completely revised and expanded. It examines every aspect of the process of yacht and powerboat design. The new edition includes new findings from recent research in aero and hydrodynamics, as well as covering the most recent changes to building standards. The authors have used a newly built 41-foot performance cruiser to demonstrate the practical application of yacht design theory. This new edition includes photos of the building process and detailed explanations.
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| 6. |
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| 7. |
- Torbacke, Marika, et al.
(författare)
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Lubricants : Introduction to Properties and Performance
- 2014
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Bok (refereegranskat)abstract
- Those working with tribology often have a background in mechanical engineering, while people working with lubricant development have a chemistry/chemical engineering background. This means they have a tradition of approaching problems in different ways. Today’s product development puts higher demands on timing and quality, requiring collaboration between people with different backgrounds. However, they can lack understanding of each other’s challenges as well as a common language, and so this book aims to bridge the gap between these two areas.Lubricants: Introduction to Properties and Performance provides an easy to understand overview of tribology and lubricant chemistry. The first part of the book is theoretical and provides an introduction to tribological contact, friction, wear and lubrication, as well as the basic concepts regarding properties and the most commonly made analyses on lubricants. Base fluids and their properties and common additives used in lubricants are also covered. The second part of the book is hands-on and introduces the reader to the actual formulations and the evaluation of their performance. Different applications and their corresponding lubricant formulations are considered and tribological test methods are discussed. Finally used oil characterisation and surface characterisation are covered which give the reader an introduction to different methods of characterising used oils and surfaces, respectively.
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| 9. |
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| 10. |
- Granstrand, Ove, 1944
(författare)
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Patent och innovationer för tillväxt och välfärd
- 2006
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Patent- och IP-frågor har förts upp på hög politisk och industriell ledningsnivå på olika håll i världen. En svensk statlig utredning av patentering och tillväxt har just avslutats (SOU 2006:80). Utredningen är baserad på ett dussintal delstudier och visar genomgående på starkasamband mellan FoU, patent, innovationer och tillväxt, speciellt för stora företag. Små innovationsföretag har däremot svårigheter att växa sig stora på grund av behov av komplementresurser och uppköp, inte minst från utlandet. Patent- och IP-kunnandet var dock i allmänhetlågt. Utredningen föreslår därför kraftigt ökade insatser i industrin, högskolevärlden och staten för ökad patentering och IP-kompetens, bland annat att ca 4 % av FoU-satsningar avsätts till IP-satsningar. Professor Ove Granstrand vid Chalmers har varit särskild utredare.Patent- och IP-frågor har förts upp på hög politisk och industriell ledningsnivå på olika håll i världen. En svensk statlig utredning av patentering och tillväxt har just avslutats (SOU 2006:80). Utredningen är baserad på ett dussintal delstudier och visar genomgående på starkasamband mellan FoU, patent, innovationer och tillväxt, speciellt för stora företag. Små innovationsföretag har däremot svårigheter att växa sig stora på grund av behov av komplementresurser och uppköp, inte minst från utlandet. Patent- och IP-kunnandet var dock i allmänhet lågt. Utredningen föreslår därför kraftigt ökade insatser i industrin, högskolevärlden och staten för ökad patentering och IP-kompetens, bland annat att ca 4 % av FoU-satsningar avsätts till IP-satsningar. Professor Ove Granstrand vid Chalmers har varit särskild utredare.
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