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Fluid Dynamics Of Active Suspensions
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Book Synopsis Fluid Dynamics of Active Suspensions by : Barath Ezhilan
Download or read book Fluid Dynamics of Active Suspensions written by Barath Ezhilan and published by . This book was released on 2016 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is devoted to understanding the effect of inter-particle interactions, external fields and confinement in active suspensions. Active suspensions, such as a bath of swimming micro-organisms, have microstructural elements which are motile and exert active stresses on the suspending fluid. The internally generated stresses in active suspensions lead to an intrinsic coupling between the swimmer configurations and the immersing fluid. The first theme of the thesis focuses on hydrodynamically driven self-organization in active suspensions. We first study the dynamics of concentrated active suspensions in a 3D periodic domain using a coupled Smoluchowski-Stokes kinetic model and discover novel instabilities for both rear-actuated (pusher) and front-actuated (puller) swimmers, characterized by giant number density fluctuations, due to the coupled effects of hydrodynamic and steric interactions. Next, we incorporate chemotactic run-and-tumble effects in the kinetic model to study the dynamics in thin films of aerotactic bacteria. A transition to chaotic dynamics beyond a critical film thickness is reported, in agreement with experiments, and shown to be a consequence of the coupling between aerotactic response of bacteria and hydrodynamic disturbance flows. The second theme focuses on the sole interplay between motility and confinement in dilute suspensions, ignoring the effect of inter-particle interactions. First, we investigate the dynamics of a confined suspension of Brownian swimmers using a simple kinetic model by prescribing a no-flux condition on the probability distribution function of particle configurations and explain several peculiar dynamics reported in experiments, viz., wall accumulation, as well as upstream swimming, centerline depletion and shear-trapping when a pressure-driven flow is imposed. Next, we calculate the swim pressure of non-Brownian run-and-tumble spherical swimmers using a kinetic model based on coupled bulk/surface probability density functions. The third theme focuses on the effect of confinement on active self-organization. We discover a symmetry-breaking phase-transition to a spontaneous flowing state with net fluid pumping beyond a critical concentration in a strongly confined channel. The framework for studying confined active suspensions is also extended to explore geometric control of active self-organization in circular and other complex domains.
Book Synopsis The Fluid Dynamics of Cell Motility by : Eric Lauga
Download or read book The Fluid Dynamics of Cell Motility written by Eric Lauga and published by Cambridge University Press. This book was released on 2020-11-05 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: A pedagogical review of the mathematical modelling in fluid dynamics necessary to understand the motility of most microorganisms on Earth.
Book Synopsis Semi-active Suspension Control by : Emanuele Guglielmino
Download or read book Semi-active Suspension Control written by Emanuele Guglielmino and published by Springer Science & Business Media. This book was released on 2008-05-27 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semi-active Suspension Control provides an overview of vehicle ride control employing smart semi-active damping systems. These systems are able to tune the amount of damping in response to measured vehicle-ride and handling indicators. Two physically different dampers (magnetorheological and controlled-friction) are analysed from the perspectives of mechatronics and control. Ride comfort, road holding, road damage and human-body modelling are studied. Mathematical modelling is balanced by a large and detailed section on experimental implementation, where a variety of automotive applications are described offering a well-rounded view. The implementation of control algorithms with regard to real-life engineering constraints is emphasised. The applications described include semi-active suspensions for a saloon car, seat suspensions for vehicles not equipped with a primary suspension, and control of heavy-vehicle dynamic-tyre loads to reduce road damage and improve handling.
Book Synopsis Advanced Control for Vehicle Active Suspension Systems by : Weichao Sun
Download or read book Advanced Control for Vehicle Active Suspension Systems written by Weichao Sun and published by Springer. This book was released on 2019-03-13 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on most recent theoretical findings on control issues for active suspension systems. The authors first introduce the theoretical background of active suspension control, then present constrained H∞ control approaches of active suspension systems in the entire frequency domain, focusing on the state feedback and dynamic output feedback controller in the finite frequency domain which people are most sensitive to. The book also contains nonlinear constrained tracking control via terminal sliding-mode control and adaptive robust theory, presenting controller design of active suspensions as well as the reliability control of active suspension systems. The target audience primarily comprises research experts in control theory, but the book may also be beneficial for graduate students alike.
Book Synopsis Optimum Design and Control of a Hybrid (hydraulic/pneumatic) Active Car Suspension System by : Byung-Hoon Lee
Download or read book Optimum Design and Control of a Hybrid (hydraulic/pneumatic) Active Car Suspension System written by Byung-Hoon Lee and published by . This book was released on 1997 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Active Control of the Heave Dynamics of Fluid Suspensions by : David A. Hullender
Download or read book On the Active Control of the Heave Dynamics of Fluid Suspensions written by David A. Hullender and published by . This book was released on 1970 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vehicle Suspension Systems and Electromagnetic Dampers by : Saad Kashem
Download or read book Vehicle Suspension Systems and Electromagnetic Dampers written by Saad Kashem and published by Springer. This book was released on 2017-09-04 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the development of a new analytical, full-vehicle model with nine degrees of freedom, which uses the new modified skyhook strategy (SKDT) to control the full-vehicle vibration problem. The book addresses the incorporation of road bank angle to create a zero steady-state torque requirement when designing the direct tilt control and the dynamic model of the full car model. It also highlights the potential of the SKDT suspension system to improve cornering performance and paves the way for future work on the vehicle’s integrated chassis control system. Active tilting technology to improve vehicle cornering is the focus of numerous ongoing research projects, but these don’t consider the effect of road bank angle in the control system design or in the dynamic model of the tilting standard passenger vehicles. The non-incorporation of road bank angle creates a non-zero steady state torque requirement.
Book Synopsis Semi-Active Suspension Control Design for Vehicles by : Sergio M. Savaresi
Download or read book Semi-Active Suspension Control Design for Vehicles written by Sergio M. Savaresi and published by Elsevier. This book was released on 2010-08-13 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semi-Active Suspension Control Design for Vehicles presents a comprehensive discussion of designing control algorithms for semi-active suspensions. It also covers performance analysis and control design. The book evaluates approaches to different control theories, and it includes methods needed for analyzing and evaluating suspension performances, while identifying optimal performance bounds. The structure of the book follows a classical path of control-system design; it discusses the actuator or the variable-damping shock absorber, models and technologies. It also models and discusses the vehicle that is equipped with semi-active dampers, and the control algorithms. The text can be viewed at three different levels: tutorial for novices and students; application-oriented for engineers and practitioners; and methodology-oriented for researchers. The book is divided into two parts. The first part includes chapters 2 to 6, in which fundamentals of modeling and semi-active control design are discussed. The second part includes chapters 6 to 8, which cover research-oriented solutions and case studies. The text is a comprehensive reference book for research engineers working on ground vehicle systems; automotive and design engineers working on suspension systems; control engineers; and graduate students in control theory and ground vehicle systems. - Appropriate as a tutorial for students in automotive systems, an application-oriented reference for engineers, and a control design-oriented text for researchers that introduces semi-active suspension theory and practice - Includes explanations of two innovative semi-active suspension strategies to enhance either comfort or road-holding performance, with complete analyses of both - Also features a case study showing complete implementation of all the presented strategies and summary descriptions of classical control algorithms for controlled dampers
Book Synopsis Complex Fluids in Biological Systems by : Saverio E. Spagnolie
Download or read book Complex Fluids in Biological Systems written by Saverio E. Spagnolie and published by Springer. This book was released on 2014-11-27 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book serves as an introduction to the continuum mechanics and mathematical modeling of complex fluids in living systems. The form and function of living systems are intimately tied to the nature of surrounding fluid environments, which commonly exhibit nonlinear and history dependent responses to forces and displacements. With ever-increasing capabilities in the visualization and manipulation of biological systems, research on the fundamental phenomena, models, measurements, and analysis of complex fluids has taken a number of exciting directions. In this book, many of the world’s foremost experts explore key topics such as: Macro- and micro-rheological techniques for measuring the material properties of complex biofluids and the subtleties of data interpretation Experimental observations and rheology of complex biological materials, including mucus, cell membranes, the cytoskeleton, and blood The motility of microorganisms in complex fluids and the dynamics of active suspensions Challenges and solutions in the numerical simulation of biologically relevant complex fluid flows This volume will be accessible to advanced undergraduate and beginning graduate students in engineering, mathematics, biology, and the physical sciences, but will appeal to anyone interested in the intricate and beautiful nature of complex fluids in the context of living systems.
Book Synopsis Bubble Wake Dynamics in Liquids and Liquid-Solid Suspensions by : Liang-Shih Fan
Download or read book Bubble Wake Dynamics in Liquids and Liquid-Solid Suspensions written by Liang-Shih Fan and published by Butterworth-Heinemann. This book was released on 2013-10-22 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to a fundamental understanding of the fluid dynamic nature of a bubble wake, more specifically the primary wake, in liquids and liquid-solid suspensions, an dto the role it plays in various important flow phenomena of multiphase systems. Examples of these phenomena are liquid/solids mixing, bubble coalescence and disintergration, particle entrainment to the freeboard, and bed contraction.
Book Synopsis Hydrodynamics of Suspensions by : Marius Ungarish
Download or read book Hydrodynamics of Suspensions written by Marius Ungarish and published by Springer. This book was released on 1993 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the 10th International Conference on Electrorheological Fluids and Magnetorheological Suspensions by : Faramarz Gordaninejad
Download or read book Proceedings of the 10th International Conference on Electrorheological Fluids and Magnetorheological Suspensions written by Faramarz Gordaninejad and published by World Scientific. This book was released on 2007 with total page 843 pages. Available in PDF, EPUB and Kindle. Book excerpt: ERMR 2006 included invited speakers, technical presentations, poster presentations, and a student paper competition. At the conference banquet, Dr. David Carlson of Lord Corporation addressed the conference attendees and gave a stirring speech on the history of ER and MR fluids, as well as current and future applications. A unique feature of the ERMR Conferences is that they comprehensively cover issues ranging from physics to chemistry to engineering applications of ER and MR materials held in a general session to enhance the interaction between the scientists and engineers. The sessions in ERMR 2006 were organized based into two Symposia: a) Materials and b) Applications. Topics covered in the Materials Symposium included: mechanisms, preparation, and characterization of ER and MR materials. Topics covered in the Applications Symposium included: ER and MR devices, control systems, system integration, and applications. This structure was implemented in order to enable interaction between attending scientists and engineers in both the Materials Symposium and the Applications Symposium, and to enhance the free flow of ideas, and the potential collaborative research opportunities.
Book Synopsis A Physical Introduction to Suspension Dynamics by : Élisabeth Guazzelli
Download or read book A Physical Introduction to Suspension Dynamics written by Élisabeth Guazzelli and published by Cambridge University Press. This book was released on 2011-11-24 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the behavior of particles suspended in a fluid has many important applications across a range of fields, including engineering and geophysics. Comprising two main parts, this book begins with the well-developed theory of particles in viscous fluids, i.e. microhydrodynamics, particularly for single- and pair-body dynamics. Part II considers many-body dynamics, covering shear flows and sedimentation, bulk flow properties and collective phenomena. An interlude between the two parts provides the basic statistical techniques needed to employ the results of the first (microscopic) in the second (macroscopic). The authors introduce theoretical, mathematical concepts through concrete examples, making the material accessible to non-mathematicians. They also include some of the many open questions in the field to encourage further study. Consequently, this is an ideal introduction for students and researchers from other disciplines who are approaching suspension dynamics for the first time.
Book Synopsis Dynamics of Passive and Semi-active Suspension Systems by :
Download or read book Dynamics of Passive and Semi-active Suspension Systems written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fluid Mechanics of Environmental Interfaces by : Carlo Gualtieri
Download or read book Fluid Mechanics of Environmental Interfaces written by Carlo Gualtieri and published by Taylor & Francis. This book was released on 2008-02-19 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: An environmental interface is defined as a surface between two abiotic or biotic systems, in relative motion and exchanging mass, heat and momentum through biophysical and/or chemical processes. These processes fluctuate temporally and spatially. The book first treats exchange processes occurring at the interfaces between atmosphere and the surface of the sea, and atmosphere and land surface. These exchanges include the effect of vegetation, transport of dust and dispersion of passive substances within the atmosphere. Processes at the environmental interfaces of freshwater, such as gas-transfer at free-surfaces of rivers, advective diffusion of air bubbles in turbulent water flows and boundary-layers phenomena in vegetated open channels are also described. Finally, the book deals with the phenomena that affect transport of material to and from the surface of an organism, including molecular and turbulent diffusion. The relevant issues related to mass transfer to and from benthic plants and animals are further considered in detail. The book will be of interest to graduate students and researchers in environmental sciences, civil engineering and environmental engineering, (geo)physics and applied mathematics.
Book Synopsis H∞ and μ-synthesis Design of Quarter Car Active Suspension System by : Mustefa Jibril
Download or read book H∞ and μ-synthesis Design of Quarter Car Active Suspension System written by Mustefa Jibril and published by GRIN Verlag. This book was released on 2020-04-09 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master's Thesis from the year 2020 in the subject Engineering - Automotive Engineering, Jimma University College of Agriculture and Veterinary Medicine, language: English, abstract: To improve the road handling and passenger comfort of a vehicle, a suspension system is provided. An active suspension system is considered to be better than the passive suspension system. In this thesis, 2 degrees of freedom of a linear quarter car active suspension system is designed, which is subject to different disturbances on the road. Since the parametric uncertainty in the spring, the shock absorber, mass and the actuator has been considered, robust control is used. In this thesis, H∞ and μ− synthesis controllers are used to improve the driving comfort and the ability to drive the car on the road. For the analysis of the time domain, using a MATLAB script program and performed a test using four disturbance inputs of the road (bump, random, sinusoidal and harmonic) for the suspension deflection, the acceleration of the body and the body travel for the active suspension with the H∞ controller and active suspension with μ− synthesis controller and the comparative simulation and reference results demonstrate the effectiveness of the presented active suspension system with μ− synthesis controller. In addition, in this thesis, comparison have been made between the active suspension system with μ−synthesis controller and 5 different robust controller for suspension deflection, body acceleration and body travel tests using bump, random, sinusoidal pavements and harmonic road disturbances. Body accelerations comparison of the active suspension system with μ−synthesis controller with VW (Volkswagen) Passat B5 passenger car is done for a bump road input disturbance and the result shows that there is a 50% reduction in body acceleration for the active suspension system with μ− synthesis controller.
Book Synopsis Dynamics of Orientable Particulate Suspensions by : Ling Qi
Download or read book Dynamics of Orientable Particulate Suspensions written by Ling Qi and published by . This book was released on 2014 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two simulation techniques that are used to approach two very different suspension problems - continuum scale 'active fluids' contain living cells that can respond to external stimuli such as light; and passive fluids contain anisotropic particles whose size is small enough that non-continuum effect caused by solvent needs to be accounted for. In the first part, instability caused by hydrodynamic interaction between the living cells is probed by Fluid Particle Dynamics (FPD). In the second part, Coarse-Grained Molecular Dynamics (CGMD) simulation is applied to investigate the relation between microstructure of the suspension, such as orientation distribution function, particle moments to its rheological behavior, such as shear viscosity.
