Academic literature on the topic 'Flexible suspension'
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Journal articles on the topic "Flexible suspension"
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Maggio, Mario, Marco Mauro, Maria Rosaria Acocella, and Gaetano Guerra. "Thermally stable, solvent resistant and flexible graphene oxide paper." RSC Advances 6, no. 50 (2016): 44522–30. http://dx.doi.org/10.1039/c6ra09476g.
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Mohd Riduan, Aizuddin Fahmi, Noreffendy Tamaldin, Ajat Sudrajat, and Fauzi Ahmad. "Review on active suspension system." SHS Web of Conferences 49 (2018): 02008. http://dx.doi.org/10.1051/shsconf/20184902008.
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For the past decade, active suspension systems had made up most of research area concerning vehicle dynamics. For this review, recent studies on automobile active suspensions systems were examined. Several vehicular suspension types were also described to compare amongst them. From published investigations by previous researchers, various automotive suspensions in terms of cost, weight, structure, reliability, ride comfortability, dynamic and handling performance were exhibited and compared. After careful examination, it was concluded that electromagnetic active suspensions should be the general direction of vehicle suspension designs due to its energy regeneration, high bandwidth, simpler structure, flexible and accurate force control, better handling performance as well as drive characteristics.
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Manikantan, Harishankar, Lei Li, Saverio E. Spagnolie, and David Saintillan. "The instability of a sedimenting suspension of weakly flexible fibres." Journal of Fluid Mechanics 756 (September 9, 2014): 935–64. http://dx.doi.org/10.1017/jfm.2014.482.
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AbstractSuspensions of sedimenting slender fibres in a viscous fluid are known to be unstable to fluctuations of concentration. In this paper we develop a theory for the role of fibre flexibility in sedimenting suspensions in the asymptotic regime of weakly flexible bodies (large elasto-gravitation number). Unlike the behaviour of straight fibres, individual flexible filaments rotate as they sediment, leading to an anisotropic base state of fibre orientations in an otherwise homogeneous suspension. A mean-field theory is derived to describe the evolution of fibre concentration and orientation fields, and we explore the stability of the base state to perturbations of fibre concentration. We show that fibre flexibility affects suspension stability in two distinct and competing ways: the anisotropy of the base state renders the suspension more unstable to perturbations, while individual particle self-rotation acts to prevent clustering and stabilizes the suspension. In the presence of thermal noise, the dominant effect depends critically upon the relative scales of flexible fibre self-rotation compared to rotational Brownian motion.
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Yao, Guo-feng, Jianhong Hou, and Pinbin Zhao. "A new methodology to calculate the equivalent stiffness matrix of the suspension structure with flexible linkages." Advances in Mechanical Engineering 9, no. 7 (July 2017): 168781401770054. http://dx.doi.org/10.1177/1687814017700548.
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The purpose of this work is to present a methodology for calculating the equivalent stiffness matrix of the wheel center of the vehicle suspension. For a suspension, the stiffness matrix of the wheel center, which is effected by the bushings and flexible linkages, control the suspension’s elasto-kinematic ( e–k) specification. The equivalent stiffness matrix of the wheel center is formulated by using the stiffness of the bushings and linkages. And the models of series and parallel springs are used to calculate this equivalent stiffness matrix based on the number of the bushings and linkages. An example is presented to illustrate how to use the proposed methodology to derive the equivalent stiffness matrix of a suspension system with three bushings and flexible linkages. The results show that the equivalent stiffness of the wheel center will decrease if the linkage stiffness is considered. This methodology can be used in all kinds of suspension structure. It can also be used to optimize and design the suspension system.
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Hac´, Aleksander, Iljoong Youn, and Hsien H. Chen. "Control of Suspensions for Vehicles With Flexible Bodies—Part II: Semi-Active Suspensions." Journal of Dynamic Systems, Measurement, and Control 118, no. 3 (September 1, 1996): 518–25. http://dx.doi.org/10.1115/1.2801175.
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Two methods of control of semi-active suspensions that specifically address the problem of structural vibrations of the vehicle body are considered. These control strategies are based on those developed for active suspension systems in Part I of this study and rely on either modifications of suspension control forces that account for body compliance or on the addition of a proof-mass actuator to reduce structural vibrations. A half-car model that includes body compliance is used to evaluate the effects of these control strategies on the performance of the suspensions with two-state and continuously modulated dampers. The performances of the systems are evaluated in both the time and frequency domains. The effect of time delays in the process of actuating the adjustable dampers is investigated. Significant reductions of structural vibrations are observed when the nodes of body beaming modes are a sufficient distance away from the suspension mounting points, and the time delays in the control system are negligible. The results deteriorate markedly when two-state dampers are used instead of continuously variable dampers or when a time delay in excess of 5 ms is present in the control loop. When the preference in suspension design shifts toward road holding it becomes increasingly difficult to improve the vehicle structural response without sacrificing other aspects of performance.
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Li, Guo Dong. "Study on Suspension Parameters of Motor Cars." Advanced Materials Research 479-481 (February 2012): 1539–44. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.1539.
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The vehicle flexible coefficient and the center of carbody sway movement are deduced. Based on the deduced equations, the influence of some critical parameters is studied for Motor Cars. In order to get the influence of the primary suspension on the dynamic performance, a vehicle model considered as a multiple rigid body system composed of wheelsets , bogie frames, carbody, primary and secondary suspensions is set up. Dynamic simulation results show that the primary suspension has a large influence on the vehicle.
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Liu, Xiang, Jing-Shan Zhao, and Zhi-Jing Feng. "Compliant dynamics of a rectilinear rear-independent system." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 5 (November 14, 2016): 785–806. http://dx.doi.org/10.1177/0954406216631369.
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The rectilinear rear-independent suspension investigated in this paper could remain the wheel alignment parameters invariable in theory. However, its dynamics is much more complex than that of the existing suspensions because of its redundant constraints in structure. Considering the elasticity of the rectilinear rear-independent suspension, a rigid-flexible half-car dynamic model is established for the first time based on the discrete time transfer matrix method. At the same time, a rigid half-car dynamic model is established as a comparison. The natural frequency characteristics and dynamic response of the rectilinear rear-independent suspension under random road excitations are analyzed and compared with those of rigid half-car dynamic model. The results reveal that the suspension system has apparent influence to the dynamics of vehicle. The wheel alignment parameters will fluctuate within a narrow range which is mainly determined by the rolling vibration of vehicle. And the suspension system could reduce and filter the road excitations with high frequency and small amplitude. This provides a good effect on the ride comfort of vehicle. Dynamics analysis of the rectilinear rear independent suspension reveals that the proposed modeling approach could deal with the dynamics of rigid-flexible multibody systems with redundant constraints effectively.
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Saraiva, Diogo V., Ricardo Chagas, Beatriz M. de Abreu, Cláudia N. Gouveia, Pedro E. S. Silva, Maria Helena Godinho, and Susete N. Fernandes. "Flexible and Structural Coloured Composite Films from Cellulose Nanocrystals/Hydroxypropyl Cellulose Lyotropic Suspensions." Crystals 10, no. 2 (February 16, 2020): 122. http://dx.doi.org/10.3390/cryst10020122.
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Lyotropic colloidal aqueous suspensions of cellulose nanocrystals (CNCs) can, after solvent evaporation, retain their chiral nematic arrangement. As water is removed the pitch value of the suspension decreases and structural colour-generating films, which are mechanically brittle in nature, can be obtained. Increasing their flexibility while keeping the chiral nematic structure and biocompatible nature is a challenging task. However, if achievable, this will promote their use in new and interesting applications. In this study, we report on the addition of different amounts of hydroxypropyl cellulose (HPC) to CNCs suspension within the coexistence of the isotropic-anisotropic phases and infer the influence of this cellulosic derivative on the properties of the obtained solid films. It was possible to add 50 wt.% of HPC to a CNCs aqueous suspension (to obtain a 50/50 solids ratio) without disrupting the LC phase of CNCs and maintaining a left-handed helical structure in the obtained films. When 30 wt.% of HPC was added to the suspension of CNCs, a strong colouration in the film was still observed. This colour shifts to the near-infrared region as the HPC content in the colloidal suspension increases to 40 wt.% or 50 wt.% The all-cellulosic composite films present an increase in the maximum strain as the concentration of HPC increases, as shown by the bending experiments and an improvement in their thermal properties.
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Vrána, Tomáš, Josef Bradáč, and Jan Kovanda. "ELASTO-KINEMATIC COMPUTATIONAL MODEL OF SUSPENSION WITH FLEXIBLE SUPPORTING ELEMENTS." Acta Polytechnica 56, no. 2 (April 30, 2016): 147. http://dx.doi.org/10.14311/ap.2016.56.0147.
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This paper analyzes the impact of flexibility of individual supporting elements of independent suspension on its elasto-kinematic characteristics. The toe and camber angle are the geometric parameters of the suspension, which waveforms and their changes under the action of vertical, longitudinal and transverse forces affect the stability of the vehicle. To study these dependencies, the computational multibody system (MBS) model of axle suspension in the system HyperWorks is created. There are implemented Finite-Element-Method (FEM) models reflecting the flexibility of the main supporting elements. These are subframe, the longitudinal arms, transverse arms and knuckle. Flexible models are developed using Component Mode Synthesis (CMS) by Craig-Bampton. The model further comprises force elements, such as helical springs, shock absorbers with a stop of the wheel and the anti-roll bar. Rubber-metal bushings are modeled flexibly, using nonlinear deformation characteristics. Simulation results are validated by experimental measurements of geometric parameters of real suspension.
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Li, Xue Ying, Zhuo Ping Yu, Zeng Liang Yu, and Lu Xiong. "Analysis of Vibration Characteristics Basing on a Multi-Rigid Suspension Model and a Multi-Flexible Suspension Model." Advanced Materials Research 748 (August 2013): 427–31. http://dx.doi.org/10.4028/www.scientific.net/amr.748.427.
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The torque vibration derived from in-wheel-motor transmitted to body frame through suspension system without the absorption of mechanical transmission parts, then excited every body panel to shape the vehicle interior noise, which influenced the quality of the vehicle NVH. This paper aims to build an accurate suspension system simulation model to analyze the influence of suspension parts parameters to system vibration transmission property. Basis on a novel empirical model of rubber bushing, a multi-rigid suspension model and a multi-flexible suspension model had been established respectively. The vibration characteristics of two models were simulated, furthermore the swept-sine exciting vertical force signal on wheel contact point were input on the simulation models to find the difference between rigid and flexible model. The simulation results show that: the multi-flexible model can reflect the vibration characteristics of the suspension system more accurately in the high frequency range and so is it more applicable to the simulation analysis of vibration characteristics of in-wheel-motor electric vehicle suspension system.
Dissertations / Theses on the topic "Flexible suspension"
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Liu, Yanan. "Dynamics of flexible and Brownian filaments in viscous flow." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC196/document.
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La dynamique de filaments flexibles individuels en écoulement visqueux est une étape essentielle pour comprendre et contrôler la rhéologie de nombreux fluides complexes. Cette dynamique sous-tend également une multitude de processus biophysiques allant de la propulsion des micro-organismes aux écoulements intracellulaires. Cette thèse présente des expériences systématiques permettant d’étudier la dynamique de filaments flexibles browniens dans un écoulement visqueux. Nous avons choisi d’utiliser un biopolymère, l’actine, comme système modèle de filaments. Sa longueur typique varie de 1 à 100 μm, il est flexible à ces échelles avec une longueur de persistance de l’ordre de 20μm, à cause de ses petites dimensions, il est soumis aux forces Browniennes avec des fluctuations en flexion, et enfin il peut être marqué en fluorescence. Nous utilisons des dispositifs microfluidiques associés à des systèmes de contrôle d’écoulements, un microscope optique équipé́ avec une platine motorisée pour réaliser des expériences contrôlées permettant de suivre la dynamique des filaments d’actine dans un écoulement de cisaillement pur et dans un écoulement élongationnel. Pour les expériences en cisaillement pur, des simulations reproduisant les conditions expérimentales ont aussi été́ menées en utilisant la théorie des poutres inextensibles d’Euler-Bernoulli et la théorie non locale des corps élancés en présence de fluctuations Browniennes et sont en accord quantitatif avec les résultats expérimentaux. Nous montrons que la dynamique des filaments dans ce système est principalement régie par le nombre élasto-visqueux, nombre sans dimension comparant les forces de trainée visqueuses aux forces de flexion élastiques, les fluctuations thermiques ne jouant qu’un rôle secondaire. Nous présentons une caractérisation complète des différents modes de déformation subies par le filament pendant une rotation ainsi que des transitions entre les différents modes. Dans la géométrie élongationnelle, nous avons choisi un canal hyperbolique optimisé pour permettre de longs temps de résidence sous taux de déformation constant. Nous avons observé́ directement la suppression des fluctuations transverse dans la partie extensionnelle tandis que nous observons, dans la partie compressive la formation de structures hélocoïdales tridimensionnelles après le flambage du filament. Pour finir, ce manuscrit de thèse décrit des développements expérimentaux permettant de fabriquer des suspensions de filaments d’actine relativement monodisperse en taille ainsi que des résultats préliminaires sur des effets rhéofluidifiants. Au bilan, les résultats présentes dans ce manuscrit pose les premières pierres de travaux futurs en direction de l’étude de la dynamique de ces filaments dans des écoulements plus complexes comme des écoulements de Poiseuille ou oscillants. Ils permettent aussi d’envisager des études sur le lien entre déformations de particules et propriétés des suspensions diluées d’objets flexibles et Brownien, lien encore peu étudié du point de vue expérimentalThe dynamics of individual flexible filament in a viscous flow is the key to deciphering the rheolog- ical behavior of many complex fluids and soft materials. It also underlies a wealth of biophysical processes from flagellar propulsion to intracellular streaming. This thesis presents systematic exper- iments to investigate the dynamics of flexible and Brownian filaments in viscous flows. Biopolymer actin has been chosen to be our experimental model filament: its typical length can be varied from 1 to 100 μm, it is flexible at these dimensions with a persistence length in the order of 20μm, it is Brow- nian due to its small diameter with bending fluctuations and it can be labelled by fluorescent dye. Microfluidic channels and flow control systems are combined to optical microscope with automated stage to carry out well-controlled experiments on the diverse dynamics of actin filaments in shear flow and pure straining flow. In shear flow, simulations matching the experimental conditions have also been performed using inextensible Euler-Bernoulli beam theory and non-local slender body hy- drodynamics in the presence of thermal fluctuations and agree quantitatively with the experimental results. We demonstrate that filament dynamics in this flow geometry is primarily governed by a dimension- less elasto-viscous number comparing viscous forces to elastic forces with thermal fluctuations only playing a secondary role. We present a complete characterization of the different modes of defor- mation undergone by the filament while rotating as well as of the transitions between these different modes. In pure straining flow, we opt to use an optimized hyperbolic channel to allow long resi- dence time at constant strain rate to be applied. We directly observe the suppression of transverse fluctuations in the extensional part of the hyperbolic channel while we observe, in the compressive part of the flow, the formation of three dimensional helical structures subsequent to the initial buck- ling of the filament. Finally, this thesis manuscript also reports on experimental developments to fabricate suspensions of actin filament with a narrow distribution of lengths and on preliminary re- sults on shear-thinning effects. All together the results presented here pave the way of future studies towards the understanding of filament dynamics in more complex flows, as Poiseuille flows or oscil- latory flows, as well as towards establishing the link between filament deformations and rheological response in dilute suspensions of flexible Brownian filaments, which remains nearly unexplored from an experimental point of view
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Rey, Daniel A. "Gravity and laboratory suspension effects on the dynamics of controlled flexible spacecraft." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/49897.
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Weng, Ming-chih 1969. "Magnetic suspension and vibration control of flexible structures for non-contact processing." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9294.
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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.Includes bibliographical references (p. 365-372).
This thesis presents the design, analysis, and experimental testing of systems for noncontact suspension and control of flexible structures. Our particular focus is on the use of such suspensions in manufacturing processes which can be facilitated by the ability to control workpiece motion without contact. This can be of significant utility in processes such as coating, painting, heat treating, and web handling. We develop a novel approach for the control of such non-contact suspensions through what we term sensor averaging and actuator averaging. The difficult stability and robustness problems imposed by the flexible dynamics of the workpiece can be overcome by taking a properly-weighted average of the outputs of a distributed array of N motion sensors (sensor averaging), and/or by applying a properly-weighted distributed array of M forces (actuator averaging) to the workpiece. The theory for these dual techniques is developed in detail in the thesis. These approaches are shown to be independent of the specific boundary conditions or the longitudinal dimensions of the workpiece. These approaches are thus generally applicable to a wide range of structural control problems. We present both analytical and numerical analyses of the structural dynamics for typical flexible workpieces such as strings, beams, membranes, and plates. The analyses include axial translation of the workpiece. We have experimentally demonstrated the utility of our theory by application in the successful magnetic suspension of a 3 m long, 6.35 mm diameter, 0.89 mm wall thickness steel tube with varying boundary conditions. This is a very challenging problem due to the extremely light damping of the modes (< 0.001 with free ends). The experiment uses a set of 8 sensors and 8 actuators to measure and control the motion of the tube in the two lateral degrees of freedom. We present the details of the developed electromagnetic actuators, position sensors, modeling of the structural dynamics, the relevant vibration control techniques, and develop the associated theory for choosing sensor and actuator locations. Our results experimentally confirm the value of our averaging techniques, and suggest the wide future application of these ideas in industrial processes which require non-contact handling of workpieces.
by Ming-chih Weng.
Ph.D.
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Foreman, Evan. "Fluidized Cathodes for Flexible Lithium-Ion Batteries." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1493375732158489.
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Joung, Clint Gwarngsoo. "Direct simulation studies of suspended particles and fibre-filled suspensions." University of Sydney. Chemical Engineering, 2003. http://hdl.handle.net/2123/554.
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A new Direct Simulation fibre model was developed which allowed flexibility in the fibre during the simulation of fibre suspension flow.This new model was called the �Chain-of-Spheres �model.It was hypothesised that particle shape and deformation could signi ficantly a ffect partic e dynamics,and also suspension bulk properties such as viscosity.Data collected from the simulation showed that flexible fibres in shear flow resulted in an order of 7 −10% bulk relative viscosity increase over the �rigid �fibre result.Results also es- tablished the existence of a relationship between bulk viscosity and particle sti ffness.In comparison with experimental results,other more conventional rigid fibre based methods appeared to underpredict relative viscosity.The flexible fibre method thus markedly improved the ability to estimate relative viscosity.The curved rigid fibre suspension also exhibited increased viscosity of the order twice that of the equivalent straight rigid fibre suspension.With such sensitivity to fibre shape,this result has some important implications for the quality of fibre inclusions used.For consistent viscosity,the shape quality of the fibres was shown to be important. The �Chain of Spheres �simulation was substantially extended to create a new simulation method with the ability to model the dynamics of arbitrarily shaped particles in the Newtonian flow field.This new �3D Particle �simulation method accounted for the inertial force on the particles,and also allowed particles to be embedded in complex flow fields.This method was used to reproduce known dynamics for common particle shapes,and then to predict the unknown dynamics of various other particle shapes in shear flow. In later sections, the simulation demonstrated inertia-induced particle migration inthe non-linear shear gradient Couette cylinder flow,and was used to predict the fibre orientation within a diverging channel flow.The performance of the method was verified against known experimental measurements,observations and theoretical and numerical results where available.The comparisons revealed that the current method reproduced single particle dynamics with great fidelity. The broad aim of this research was to better understand the microstruc- tural dynamics within the fibre-filled suspension and from it,derive useful engineering information on the bulk flow of these fluids.This thesis represents a move forward to meet this broad aim.It is hoped that future researchers may bene fit from the new approaches and algorithms developed here.
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Wu, Jingshu. "Direct simulation of flexible particle suspensions using lattice-boltzmann equation with external boundary force." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33858.
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Determination of the relation between the bulk or rheological properties of a particle suspension and its microscopic structure is an old and important problem in physical science. In general, the rheology of particle suspension is quite complex, and the problem becomes even more complicated if the suspending particle is deformable. Despite these difficulties, a large number of theoretical and experimental investigations have been devoted to the analysis and prediction of the rheological behavior of particle suspensions. However, among these studies there are very few investigations that focus on the role of particle deformability.
A novel method for full coupling of the fluid-solid phases with sub-grid accuracy for the solid phase is developed. In this method, the flow is computed on a fixed regular 'lattice' using the lattice Boltzmann method (LBM), where each solid particle, or fiber, is mapped onto a Lagrangian frame moving continuously through the domain. The motion and orientation of the particle are obtained from Newtonian dynamics equations. The deformable particle is modeled by the lattice-spring model (LSM).The fiber deformation is calculated by an efficient flexible fiber model. The no-slip boundary condition at the fluid-solid interface is based on the external boundary force (EBF) method. This method is validated by comparing with known experimental and theoretical results.
The fiber simulation results show that the rheological properties of flexible fiber suspension are highly dependent on the microstructural characteristics of the suspension. It is shown that fiber stiffness (bending ratio BR) has strong impact on the suspension rheology in the range BR < 3. The relative viscosity of the fiber suspension under shear increases significantly as BR decreases. Direct numerical simulation of flexible fiber suspension allows computation of the primary normal stress difference as a function of BR. These results show that the primary normal stress difference has a minimum value at BR ∼ 1. The primary normal stress differences for slightly deformable fibers reaches a minimum and increases significantly as BR decreases below 1. The results are explained based on the Batchelor's relation for non-Brownian suspensions. The influence of fiber stiffness on the fiber orientation distribution and orbit constant is the major contributor to the variation in rheological properties. A least-squares curve-fitting relation for the relative viscosity is obtained for flexible fiber suspension. This relation can be used to predict the relative viscosity of flexible fiber suspension based on the result of rigid fiber suspension.
The unique capability of the LBM-EBF method for sub-grid resolution and multiscale analysis of particle suspension is applied to the challenging problem of platelet motion in blood flow. By computing the stress distribution over the platelet, the "blood damage index" is computed and compared with experiments in channels with various geometries [43]. In platelet simulation, the effect of 3D channel geometry on the platelet activation and aggregation is modeled by using LBM-EBF method. Comparison of our simulations with Fallon's experiments [43] shows a similar pattern, and shows that Dumont's BDI model [40] is more appropriate for blood damage investigation. It has been shown that channels with sharp transition geometry will have larger recirculation areas with high BDI values. By investigating the effect of hinge area geometry on BDI value, we intend to use this multiscale computational method to optimize the design of Bileaflet mechanical heart valves.
Both fiber simulations and platelet simulations have shown that the novel LBM-EBF method is more efficient and stable compare to the conventional numerical methods. The new EBF method is a two-Cway coupling method with sub-grid accuracy which makes the platelet simulations possible. The LBM-EBF is the only method to date, to the best of author's knowledge, that can simulate suspensions with large number of deformable particles under complex flow conditions. It is hoped that future researchers may benefit from this new method and the algorithms developed here.
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Zakri, Waleed. "Fabrication and Simulation of Semi-Solid Electrodes for Flexible Lithium-Ion Batteries." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1531480028749308.
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Balsys, Artūras. "Neskėtriojo dviejų tarpatramių kabamojo tilto elgsenos analizė." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110623_163355-63567.
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Šiuolaikinių tiltų įstabios architektūrinės formos ir tiltų statybos vietos ne visada leidžia pritaikyti dažniausiai naudojamas konstrukcines schemas. Todėl inžinieriams tenka pasinaudoti retesniais, mažiau tyrinėtais tiltų konstrukciniais variantais. Pastaruoju metu pasaulyje, ypač Kinijoje, vėl pradėta naudoti kabamųjų tiltų atmaina – neskėtrieji kabamieji tiltai. Išaugęs tokių tiltų poreikis reikalauja išsamios neskėtriojo kabamojo tilto elgsenos ypatumų analizės. Nuodugniam šios konstrukcinės schemos analizės atlikimui suformuluojamas darbo tikslas – išnagrinėti neskėtriųjų tiltų pradinės analizės metodus, įvairių variantų vienpilonių neskėtriųjų tiltų elgseną veikiant statinei apkrovai. Šiam tikslui pasiekti keliami tokie uždaviniai: 1. Apžvelgti kabamųjų tiltų konstrukcijas, jų projektavimo bei elgsenos ypatumus. 2. Išanalizuoti kabamųjų tiltų analizės metodus, išskiriant neskėtriųjų tiltų skaičiavimo ypatumus. 3. Išanalizuoti vienpilonių neskėtriųjų plieno tiltų elgseną, veikiant simetrinei ir asimetrinei apkrovoms. 4. Kabamojo tilto pradinei formai stabilizuoti pritaikyti baigtinio lenkiamojo standžio elementus. 5. Parinkti neskėtriojo tilto racionalius komponuojamuosius parametrus ir įvertinti neskėtriųjų kabamųjų tiltų panaudojimo galimybes. Darbe taikomas kompiuterinis modeliavimas baigtinių elementų metodu, naudojantis MIDAS Civil programa. Apžvelgiami gauti rezultatai ir pateikiamos išvados bei pasiūlymai.Wonderful shapes of modern bridges, especially pedestrian, and their construction sites not always let to adapt usual bridge structure. That’s why engineers have to use unusual and less researched structures. Recently in the world, especially in China, other suspended structure is being used – self-anchored suspension bridges. Recently grown popularity of these bridges requires comprehensive self-anchored bridge behavioral analysis. For an extensive analysis accomplishment the objective is stated – to examine initial analysis methods of self-anchored suspension bridges, behavior of various two-span self-anchored bridges subjected to static loading. To achieve this objective, following tasks are raised: 1. Review suspension bridge structures, their analysis and design peculiarities. 2. Analyze calculation methods of suspension bridges, including peculiarities of self-anchored bridge design. 3. Analyze behavior of steel two-span self-anchored suspension bridge subjected to symmetrical and asymmetrical loading. 4. Apply finite bending stiffness elements for main cables to stabilize primer shape. 5. Evaluate self-anchored suspension bridge technical-economic performance. Computer-aided design using finite element program MIDAS Civil is applied in this research. An overview of the results with conclusions and recommendations are presented.
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Онищенко, Дмитро Миколайович. "Процес обробки волокнистих суспензій у ротороно-пульсаційному апараті." Master's thesis, Київ, 2019. https://ela.kpi.ua/handle/123456789/27647.
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Робота складається із вступу та п’яти розділів. Загальний обсяг роботи: 150 аркушів основного тексту, 33 ілюстрацій, 31 таблиць, перелік посилань 41 найменувань та 5 додатків.
Об’єкт дослідження – процес диспергування макулатурної маси у роторно-пульсаційному апараті.
Предмет дослідження – кінетика процесу диспергування макулатурної маси у роторно-пульсаційному апараті.
Мета дослідження – встановлення закономірностей диспергування макулатурної маси у роторно-пульсаційному апараті.
Методи досліджень: теоретичний аналіз, математичне моделювання, експериментальне дослідження процесу диспергування в одноступінчастому роторно-пульсаційному апараті, встановленння функціональних залежностей, достовірності та адекватності розробленої математичної моделі.
Результати роботи та їх новизна:
- Сформульовано фізичну модель диспергування волокнистих суспензій у РПА.
- Розроблено математичну модель кінетики пульсаційного диспергування волокнистих суспензій.
- Експериментально перевірено адекватність фізичної та математичної моделі.
− Складено алгоритм розрахунку РПА, з урахуванням особливостей процесу диспергування волокнистих суспензій.
− Запропоновано варіант конструкції РПА, що дозволяє підвищити ефективність установки для проведення хіміко-технологічних процесів у рідинах, використавши прості, з точки зору виготовлення та встановлення, конструкційні елементи без зміни габаритних розмірів установки та ускладнення її обслуговування.
− Розроблено технологічну схему з застосуванням РПА при виробництві макулатурної маси.
Розроблено стартап проект, в якому проведеного аналіз перспективи впровадження з огляду на потенційні групи клієнтів, бар’єри входження, стан конкуренції, конкурентоспроможність проекту.
Основний зміст дисертації викладено в 7-ми опублікованих роботах, у тому числі у двох статтях у наукових фахових виданнях України, чотирьох публікаціях в матеріалах міжнародних конференцій і наукових семінарів та в патенті України.The work consists of an introduction and five sections. Total volume of work: 150 pages of the main text, 33 illustrations, 31 tables, list of references of 41 titles and 5 applications. The object of the study is the process of the waste paper dispersion in a rotary-pulsating apparatus. The subject of the study is the kinetics of the waste paper dispersion in a rotary-pulsating apparatus. The purpose of the study is to determine the regularities of the preparation of the waste paper dispersion in rotary-pulsating apparatus. Methods of research: theoretical analysis, mathematical modeling, experimental study of the dispersion process in a one-stage rotary-pulsating apparatus, the establishment of functional dependencies, and the reliability and adequacy of the developed mathematical model. Results of work and their novelty: − Physical model of dispersion of fibrous suspensions in RPA was formulated. − A mathematical model of the kinetics of pulsed dispersion fibrous suspensions has been developed. − The adequacy of the physical and mathematical model has been experimentally tested. − An algorithm for calculation of RPA, taking into account the features of the process of dispersing fibrous slurries, has been prepared. − A variant of the RPA design is proposed, which makes it possible to increase the efficiency of the installation for carrying out chemical and technological processes in liquids, using structural elements simple in terms of fabrication and installation, without changing the overall dimensions of the installation and complicating its maintenance. − The technological scheme that includes RPA in the production of waste paper has been developed. A startup project has been developed, in which the analysis of the implementation perspective takes into account the potential client groups, entry barriers, the state of competition, the competitiveness of the project. The main content of the dissertation is presented in 7 published works, including two articles in scientific professional editions of Ukraine, four publications in materials of international conferences and scientific seminars and in the patent of Ukraine.
Работа состоит из введения и пяти разделов. Общий объем работы 150 листов основного текста, 33 иллюстраций, 31 таблиц, список литературы 41 наименований и 5 приложений. Объект исследования - процесс диспергирования макулатурной массы в роторно-пульсационном аппарате. Предмет исследования - кинетика процесса диспергирования макулатурной массы в роторно-пульсационном аппарате. Цель исследования - установление закономерностей диспергирования макулатурной массы в роторно-пульсационном аппарате. Методы исследований: теоретический анализ, математическое моделирование, экспериментальное исследование процесса диспергирования в одноступенчатом роторно-пульсационном аппарате, уставновление функциональных зависимостей, достоверности и адекватности разработанной математической модели. Результаты работы и их новизна: − Сформулированы физическую модель диспергирования волокнистых суспензий в РПА. − Разработана математическая модель кинетики пульсационного диспергирования волокнистых суспензий. − Экспериментально проверено адекватность физической и математической модели. − Составлен алгоритм расчета РПА, с учетом особенностей процесса диспергирования волокнистых суспензий. − Предложен вариант конструкции РПА, что позволяет повысить эффективность установки для проведения химико-технологических процессов в жидкостях, использовав простые, с точки зрения изготовления и установки, конструкционные элементы без изменения габаритных размеров установки и усложнения ее обслуживания. − Разработана технологическая схема с применением РПА при производстве макулатурной массы. − Разработан стартап проект, в котором проведенного анализ перспективы внедрения учитывая потенциальные группы клиентов, барьеры вхождения, состояние конкуренции, конкурентоспособность проекта. Основное содержание диссертации изложены в 7-ми опубликованных работах, в том числе в двух статьях в научных изданиях Украины, четырех публикациях в материалах международных конференций и научных семинаров и в патенте Украины.
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Slutskiy, Dmitriy. "Métriques polyèdrales sur les bords de variétés hyperboliques convexes et flexibilité des polyèdres hyperboliques." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2087/.
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Cette thèse de doctorat contient trois résultats principaux. Dans le premier chapitre on construit un polyèdre infinitésimalement flexible dans l'espace hyperbolique à trois dimensions dont le volume n'est pas stationnaire sous sa flexion infinitésimale. Dans le deuxième chapitre on obtient une condition nécessaire de flexibilité des suspensions dans l'espace hyperbolique à trois dimensions. Dans les deux derniers chapitres on démontre l'existence d'une variété quasi-Fuchsienne convexe compacte dont la métrique induite de son bord est une métrique polyèdrale hyperbolique prescriteThis thesis contains three main results. In the first chapter we construct an infinitesimally flexible polyhedron in hyperbolic 3-space such that its volume is not stationary under the infinitesimal flex. In the second chapter we obtain a necessary condition for flexibility of suspensions in hyperbolic 3-space. In the last two chapters we show the existence of a quasi-Fuchsian convex compact manifold such that the induced metric on its boundary coincides with a prescribed hyperbolic polyhedral metric
Books on the topic "Flexible suspension"
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Hooghe, Liesbet, Gary Marks, Tobias Lenz, Jeanine Bezuijen, Besir Ceka, and Svet Derderyan. Measuring International Authority. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198724490.001.0001.
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This book sets out a measure of authority for seventy-six major international organizations (IOs) from 1950 to 2010 in an effort to provide systematic comparative information on international governance. On the premise that transparency is key in the production of data, the authors chart a path in laying out the assumptions that underpin the measure. Successive chapters detail the authors’ theoretical, conceptual, and coding decisions. In order to assess their authority, the authors model the composition of IO bodies, their roles in decision making, the bindingness of IO decisions, and the mechanisms through which they seek to settle disputes. Profiles of regional, cross-regional, and global IOs explain how they are composed and how they make decisions. A distinctive feature of the measure is that it breaks down the concept of international authority into discrete dimensions. The Measure of International Authority (MIA) is built up from coherent ingredients—the composition and role of individual IO bodies at each stage in policy making, constitutional reform, the budget, financial compliance, membership accession, and the suspension of members. These observations can be assembled—like Lego blocks—in diverse ways for diverse purposes. This produces a flexible tool for investigating international governance and testing theory.
Book chapters on the topic "Flexible suspension"
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Ma, Guoliang, Minglong Xu, and Hongguang Li. "Suspension Dynamics Analysis and LMS Adaptive Control of a Hoop Flexible Structure." In Lecture Notes in Electrical Engineering, 142–56. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5912-6_11.
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Heffer, Chris. "Justified Untruthfulness." In All Bullshit and Lies?, 111–37. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190923280.003.0005.
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This chapter outlines a systematic framework for analyzing the many discursive circumstances in which speakers may justifiably suspend their commitment to truthfulness. Other approaches to ethical justifiability, such as the overtness of the communication and the epistemic categorization of conventional speech settings, are considered but rejected. The framework of suspensions set out here provides for a more flexible and nuanced analysis that does not prejudge the epistemic status of a given discursive context. Three main types of suspension—conventional, consequential, and condonable—are identified through application of the Golden Rule, and the chapter considers the conditions under which they are both justifiable in principle and justified in practice. While breach of trust is the primary determinant of whether or not a speaker’s suspension of commitment to truthfulness is justifiable in principle, there is no necessary correlation between discourse context and trust.
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Skarka, Wojciech, Wojciech Kocoń, Ryszard Skoberla, and Anna Bzymek. "Innovative Suspension System Integrated to the Wheel Rim for Lightweight Vehicle." In Advances in Transdisciplinary Engineering. IOS Press, 2019. http://dx.doi.org/10.3233/atde190147.
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Car industry has dynamically developed the electric car segment and is always on the lookout for new solutions that could help a company to become a leader brand on the market. Besides fully autonomous car technologies also new mechanical solutions could give advantage over other companies. Thus many ideas have been made to replace conventional vehicle suspension by the use of a flexible wheel rim. Based on over a year of experience, researches and studies in a field of existing lightweight vehicle suspension systems it was decided to design new solution, which structure eliminates main disadvantages of existing solutions such as energy losses and poor stability. The new suspension solution was designed based on our own knowledge and TRIZ method as a tool of verification. The CAD model of subassembly was subjected to a virtual examination for three different situations: standard ride, hard braking and sudden acceleration. Then a mathematical model of vibration damping properties has been created using MATLAB Simulink software. Additionally, the suspension quality and energy loss analysis have been performed to verify whether the problem was solved. The obtained results have been investigated and compared with commercially used car suspension systems.
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Samantaray, Arun K., and Smitirupa Pradhan. "Dynamic Analysis of Steering Bogies." In Advances in Civil and Industrial Engineering, 524–79. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-5225-0084-1.ch021.
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Running times of high-speed rolling stock can be reduced by increasing running speed on curved portions of the track. During curving, flange contact causes large lateral force, high frequency noises, flange wears and wheel load fluctuation at transition curves. To avoid derailment and hunting, and to improve ride comfort, i.e., to improve the curving performances at high speed, forced/active steering bogie design is studied in this chapter. The actively steered bogie is able to negotiate cant excess and deficiency. The bogie performance is studied on flexible irregular track with various levels of cant and wheel wear. The bogie and coach assembly models are developed in Adams VI-Rail software. This design can achieve operating speed up to 360 km/h on standard gauge ballasted track with 150mm super-elevation, 4km turning radius and 460m clothoid type entry curve design. The key features of the designed bogie are the graded circular wheel profiles, air-spring secondary suspension, chevron springs in the primary suspension, anti-yaw and lateral dampers, and the steering linkages.
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"The compared study of flexible central buckles cable girder anchorage system of steel truss girder suspension bridge." In Green Building, Materials and Civil Engineering, 851–58. CRC Press, 2014. http://dx.doi.org/10.1201/b17568-176.
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TANG, X., X. ZHANG, and R. TAO. "FLEXIBLE FIXTURE DEVICE WITH MAGNETO-RHEOLOGICAL FLUIDS." In Electro-Rheological Fluids And Magneto-Rheological Suspensions, 700–708. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812793607_0080.
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Streltsov, P. M., I. P. Lehetska, and T. S. Labunska. "THE METHODS OF CALCULATION OF THE TIME OPTIMAL CONTROL OF LIGHT BRIDGE CRANES AT TRANSFERENCE OF LOAD ON FLEXIBLE ROPE SUSPENSION WITH VARYING LENGTHS." In Development of Scientific Schools of Odessa National Maritime University, 117–36. Izdevnieciba “Baltija Publishing”, 2020. http://dx.doi.org/10.30525/978-9934-588-86-0.07.
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Giovanniello, D. S., and E. L. Snyder. "Blood transfusion." In Oxford Textbook of Medicine, edited by Chris Hatton and Deborah Hay, 5563–78. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780198746690.003.0548.
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Transfusion of blood components is a life-saving treatment for patients with severe haemorrhage and can also be used to replace coagulation factors and to ameliorate the effects of severe anaemia, thrombocytopenia, and impaired platelet function. With greater understanding of red cell, platelet, and leucocyte antigen structure and function, transfusion therapy has improved. In addition, understanding current and emerging infectious agents has ensured patient safety. Transfusion medicine has expanded over recent decades to include multiple disciplines, such as therapeutic apheresis, cellular therapy, and tissue banking. One of the most important technological improvements in transfusion therapy was the development of sterile, disposable, and flexible plastic containers that allow separation of whole blood into cellular (e.g. red cells, platelets) and noncellular (e.g. plasma, cryoprecipitate) components, known as apheresis. This technology allows the blood of a donor or patient to pass through an apparatus that separates out one particular constituent and returns the remainder to the circulation. Anticoagulants and additives currently used to collect blood allow storage of liquid suspensions of concentrated red cells for 35 to 42 days. These advances have essentially eliminated the use of whole blood. Blood transfusion is used to treat patients with severe anaemia, haemorrhage, thrombocytopenia, and coagulation disorders. Although the hazards of blood replacement are relatively small, the expected benefit of a transfusion must outweigh the risk to the patient. Therefore, a thorough understanding of the indications of blood transfusion is required to minimize unnecessary blood replacement and to prevent wastage of limited blood resources. Clinicians who prescribe blood transfusion must also be familiar with the risks and be able to recognize and treat transfusion reactions.
Conference papers on the topic "Flexible suspension"
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Cao, Dongpu, Amir Khajepour, and Xubin Song. "Modeling and Analysis of Flexible-Wheel Suspension Concept." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87404.
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Flexible-wheel (FW) suspension concept has been recently proposed and regarded to be one of the novel technologies for future ground vehicles as well as planetary surface rovers. The FW concept generally integrates stiffness/damping components within an airless tire and wheel unit, to offer considerably potential benefits in decoupled ride and handling, compact and lightweight design, enhanced traction, road-holding, road-friendliness, driving safety and fuel efficiency. This study attempts efforts to develop generalized models for fundamental stiffness and damping properties of the FW suspension concept. Based on the generalized models, suspension properties are analyzed for two different FW design configurations. The generalized analytical formulations of the suspension properties of conceptual FW suspension designs would serve as a preliminary theoretical foundation for the development of FW suspension systems for future vehicle applications.
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Foo, E. "Active suspension control strategies for flexible-bodied railway vehicles." In UKACC International Conference on Control (CONTROL '98). IEE, 1998. http://dx.doi.org/10.1049/cp:19980415.
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Xiaoping, Shi, and Yuan Guoping. "Robust attitude tracking control scheme for flexible spacecraft with vibration suspension." In 2013 25th Chinese Control and Decision Conference (CCDC). IEEE, 2013. http://dx.doi.org/10.1109/ccdc.2013.6561260.
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Safari, Amirsaeid, S. Mehralian, and Mohammad Teshnehlab. "Full-Car Active Suspension System Identification Using Flexible Deep Neural Network." In 2020 8th Iranian Joint Congress on Fuzzy and intelligent Systems (CFIS). IEEE, 2020. http://dx.doi.org/10.1109/cfis49607.2020.9238686.
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Cui, Junning, Xingyuan Bian, Tao Sun, and Leilei Li. "Stiffness modeling of flexible suspension structure for displacement measurement probing sensors." In International Symposium on Precision Engineering Measurement and Instrumentation, edited by Junning Cui, Jiubin Tan, and Xianfang Wen. SPIE, 2015. http://dx.doi.org/10.1117/12.2183076.
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Wang, Chunjian, John Adcox, Beshah Ayalew, Benoit Dailliez, Timothy Rhyne, and Steve Cron. "On the Stability of Tire Torsional Oscillations Under Locked-Wheel Braking." In ASME 2014 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/dscc2014-5988.
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This paper deals with the stability of self-excited tire torsional oscillations during locked-wheel braking events. Using a combination of torsionally flexible tire-wheel model and a dynamic tire-ground friction model, it is highlighted that the primary cause of unstable oscillations is the ‘Stribeck’ effect in tire-ground friction. It is also shown analytically that when suspension torsional compliances are negligible, the bifurcation parameters for the local torsional instability include forward speed, normal load and tire radius. In the presence of significant suspension torsional compliance, it is shown that the stability is also affected by suspension torsional stiffness and damping. Furthermore, the tire torsional stiffness becomes an important bifurcation parameter only in the presence of significant suspension compliance. This analysis gives useful insights for the selection of tire sidewall stiffness ranges and their proper matching with targeted vehicle suspensions at the design stage.
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Sinokrot, Tariq Z., William C. Prescott, Maurizio Nembrini, and Alessandro Toso. "Multibody System Modeling of Flexible Twist Beam Axles in Car Suspension Systems." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62680.
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Dynamic simulation techniques that are based on Multibody system approaches have become an important topic in studying the performance of various mechanical components that comprise an automotive system. One of the challenging issues in such studies is the ability to properly account for the flexibility of certain parts in the system. One example where this is important is the design of twist beam axles in car suspension systems where twisting deformations are present. These deformations are geometrically nonlinear and require a special handling. In this paper two multibody system approaches that are commonly used in overcoming such problem are examined. The first method is a sub-structuring technique that is based on the popular method of component mode synthesis. This method is based on dividing the flexible component into sub-structures, in which, the linear elastic structural theory is sufficient to describe the deformation of each sub-structure. Using this method the deformation of the beam is described using the mode shapes of vibration of each sub-structure. The equations of motion, in this case, are written in terms of the system’s generalized coordinates and modal participation factors. In the second method a Multibody System (MBS) solver and an external nonlinear Finite Element Analysis (FEA) solver are coupled together in a co-simulation manner. The nonlinear FEA solver, in this case, is used in modeling the deformation of the twist beam. The forces due to the nonlinear deformations of the flexible beam are communicated to the MBS solver at certain attachment points where the flexible body is attached to the rest of the multibody system. The displacements and velocities of these attachment points are calculated by the MBS solver and are communicated back to the nonlinear FEA solver to advance the simulation. The two methods described above will be reviewed in this paper and an example of a twist beam axle in a car suspension system model will be examined twice, once using the sub-structuring method, and once using the co-simulation method. The numerical results obtained using both methods will be analyzed and compared.
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Se-gon Roh, Bokman Lim, Hyunpil Moon, Jung-Sub Lee, Jae Hoon Park, Ja Choon Koo, and Hyouk Ryeol Choi. "Flexible suspension mechanism for stable driving of a differential drive mobile robot." In 2013 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2013). IEEE, 2013. http://dx.doi.org/10.1109/iros.2013.6697156.
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Chen, Xin, and Yi Lin. "Research on the Dynamics of Flexible Multibody System of Passenger Car Suspension." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1998. http://dx.doi.org/10.4271/980899.
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Patten, William N., Rao M. Chalasani, David Allsup, and John Blanks. "Analysis of Control Issues for a Flexible One-Half Car Suspension Model." In 1990 American Control Conference. IEEE, 1990. http://dx.doi.org/10.23919/acc.1990.4790962.
Full textReports on the topic "Flexible suspension"
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Mittleman, Don. Counter-Balanced Suspension Systems: Rigid and Flexible (Extensions of the Atwood's Machine). Fort Belvoir, VA: Defense Technical Information Center, April 1989. http://dx.doi.org/10.21236/ada213164.
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