Relevant bibliographies by topics / Friction models

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Friction models'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Friction models"

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Olsson, H., K. J. Åström, C. Canudas de Wit, M. Gäfvert, and P. Lischinsky. "Friction Models and Friction Compensation." European Journal of Control 4, no. 3 (January 1998): 176–95. http://dx.doi.org/10.1016/s0947-3580(98)70113-x.

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Hora, Pavel, Christoph Becker, Long Chang Tong, Joachim Maier, and Soeren Mueller. "Advanced Frictional Models for Extrusion Application." Key Engineering Materials 585 (December 2013): 41–48. http://dx.doi.org/10.4028/www.scientific.net/kem.585.41.

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During the extrusion processes, very complex adhesion and friction effects between the die surface and the extruded material occur. They have a strong influence on the velocity distribution in the profile, as well as on the life-term behavior of the tools. In the framework of the virtual process modeling usually the Coulomb or the Shear Friction models are applied. The practical experience shows, that those simplified descriptions of the frictional behavior result in poor FEM results. The present work relates to experimentally evaluated tribological behavior of the Torsion-Tribo-test and shows how those data can be transferred to different new friction models.
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Blau, Peter J. "Embedding Wear Models into Friction Models." Tribology Letters 34, no. 1 (December 3, 2008): 75–79. http://dx.doi.org/10.1007/s11249-008-9395-1.

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Zhang, Zhigang, Ling Zou, Hang Liu, Yonglong Chen, and Benzhu Zhang. "Effects of operating and material parameters on the thermal characteristics of a wet clutch." Advances in Mechanical Engineering 13, no. 7 (July 2021): 168781402110341. http://dx.doi.org/10.1177/16878140211034101.

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Based on the frictional mechanism of a wet clutch, frictional models of wet clutch engagement were established using the modified Reynolds equation and the elastic contact model between frictional pairs. Then, the heat flux models for the viscous shear and asperity friction were built, and the two-dimensional transient thermal models for the separator plate, friction disk, and ATF heat convection model were deduced based on the heat transfer theory and conservation law of energy. Finally, the Runge–Kutta numerical method was used to solve the frictional and thermal models. The average temperature of the separator plate, friction disk, and ATF were calculated. The effects of operating and material parameters, such as applied pressure, initial angular velocity, friction lining permeability, surface combined roughness RMS, equivalent elastic modulus, and ATF flow, on the thermal characteristics of friction pairs and ATF during engagement, were studied. The simulation results show that the temperature characteristics of the separator plate, friction disk, and ATF depend mainly on the viscous shear and asperity friction heat flux, and that the operating and material parameters of the wet clutch also have significant impacts on the overall variation trend of the thermal characteristics of the separator plate, friction disk, and ATF.
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Wingertszahn, Patrick, Oliver Koch, Lorenzo Maccioni, Franco Concli, and Bernd Sauer. "Predicting Friction of Tapered Roller Bearings with Detailed Multi-Body Simulation Models." Lubricants 11, no. 9 (September 1, 2023): 369. http://dx.doi.org/10.3390/lubricants11090369.

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In the presented work, a parametric multibody simulation model is presented that is capable of predicting the friction torque and kinematics of tapered roller bearings. For a highly accurate prediction of bearing friction, consideration of solid and lubricant friction is mandatory. For tapered roller bearings in particular, the friction in the contact between the rolling element and raceway is of importance. Friction forces in the contact between the rolling element end face and inner ring rib as well as roller cage pocket contacts are also considered in the model. A large number of tests were carried out to validate the model in terms of the simulated frictional torque. Influencing variables such as speed, axial load, radial load, and temperature were investigated. The simulation results show good agreement with the measured friction torque, which confirms that the model is well suited to predict frictional torques and therefore the kinematics of tapered roller bearings.
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Sentemova, O. S. "Multicomponent models of friction." Moscow University Mechanics Bulletin 66, no. 6 (December 2011): 138–40. http://dx.doi.org/10.3103/s0027133011060033.

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OLEKSOWICZ, SELIM, and ANDRZEJ MRUK. "FRICTION PROCESS IN THE PRESENCE OF HARD ABRASIVE PARTICLES — COOPERATION MODEL." Surface Review and Letters 18, no. 06 (December 2011): 249–59. http://dx.doi.org/10.1142/s0218625x11014734.

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The paper presents the results of the investigation performed on a stand for model testing of the friction pair like a car disc brake. The tests were performed for the mating operation of a frictional node with the dosage of hard abrasive particles into the friction zone. Based on the observation of the phenomena in the friction zone and the analysis of the parameters describing operating conditions of a frictional node, physical models of the frictional node cooperation in the presence of hard abrasive particles have been proposed. During the tests, using the transparent material of a friction cover plate and a fast recording camera, a visual analysis of the material transfer in the friction zone was done. It allowed to positively verifying the proposed physical models of the frictional node cooperation in the presence of hard abrasive particles.
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Lemu, Hirpa G., and Tomasz Trzepieciński. "Multiple Regression and Neural Network Based Characterization of Friction in Sheet Metal Forming." Advanced Materials Research 1051 (October 2014): 204–10. http://dx.doi.org/10.4028/www.scientific.net/amr.1051.204.

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This article proposes a frictional resistance description approach in sheet metal forming and the objective is to characterize the friction coefficient value under a wide range of friction conditions without performing time-consuming experiments. To describe the friction condition in sheet metal forming simulations, the friction coefficient should be quantified using friction models. Realistic friction models must account for the influence of surface roughness and surface topography on the lubricant flow and dry friction conditions. Due to considerable amount of factors that affect the friction coefficient value, building the analytical friction model for specified process conditions is too demanding. Thus, mathematical models that describe the friction behaviour using multiple regression analysis (MRA) and artificial neural networks (ANN) are utilized. The regression analysis was performed using the user subroutine in the MATLAB, while the ANN model was built in STATISTICA Neural Networks. As input variables for regression model and training of multilayer perceptron (MLP) the results of strip drawing friction test were utilized.
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Demianiuk, Volodymyr. "CONSTRUCTION OF FRICTION FEATURES OF FRICTION MOVEMENTS OF BRAKE MECHANISMS IN THE VIEW OF THIRD-ORDER POLYNOMIAL MODELS." AUTOMOBILE ROADS AND ROAD CONSTRUCTION, no. 111 (June 30, 2022): 252–59. http://dx.doi.org/10.33744/0365-8171-2022-111-252-259.

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The concepts of frictional characteristic of the brake mechanism and frictional characteristic of the friction pair of the brake mechanism, which are necessary for the calculation of the real braking properties of vehicles, are considered. An experimental device has been developed to determine the influence of such destabilizing factors as temperature, sliding speed and contact pressure on the mentioned characteristics. A method for obtaining polynomial models of the third order to determine the effect of temperature, sliding speed and contact pressure on the coefficient of friction in the friction pairs of brake mechanisms is proposed. The technique is suitable for cases when the second-order models inadequately describe the effect of these destabilizing factors on the coefficient of friction in the friction pairs of brake mechanisms.
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Tee, J. W., S. H. Hamdan, and W. W. F. Chong. "Predictive tool for frictional performance of piston ring-pack/liner conjunction." Journal of Mechanical Engineering and Sciences 13, no. 3 (September 27, 2019): 5513–27. http://dx.doi.org/10.15282/jmes.13.3.2019.19.0445.

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Fundamental understanding of piston ring-pack lubrication is essential in reducing engine friction. This is because a substantial portion of engine frictional losses come from piston-ring assembly. Hence, this study investigates the tribological impact of different piston ring profiles towards engine in-cylinder friction. Mathematical models are derived from Reynolds equation by using Reynolds’ boundary conditions to generate the contact pressure distribution along the complete piston ring-pack/liner conjunction. The predicted minimum film thickness is then used to predict the friction generated between the piston ring-pack and the engine cylinder liner. The engine in-cylinder friction is predicted using Greenwood and Williamson’s rough surface contact model. The model considers both the boundary friction and the viscous friction components. These mathematical models are integrated to simulate the total engine in-cylinder friction originating from the studied piston ring-pack for a complete engine cycle. The predicted minimum film thickness and frictional properties from the current models are shown to correlate reasonably with the published data. Hence, the proposed mathematical approach prepares a simplistic platform in predicting frictional losses of piston ring-pack/liner conjunction, allowing for an improved fundamental understanding of the parasitic losses in an internal combustion engine.
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Dissertations / Theses on the topic "Friction models"

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Liu, Chi-hong, and 廖志航. "Base friction modelling of discontinuous rock masses." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B42577123.

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Do, Nguyen Ba. "Modeling of Frictional Contact Conditions in Structures." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7123.

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This thesis explores two aspects of modeling the behavior of joint friction in structures. The first aspect deals with the accurate and efficient simulation of a simple system that incorporates the LuGre friction law. Energy transfer and dissipation in a structural joint model is the second topic of this thesis. It is hypothesized that friction could serve to pump energy from one frequency to higher frequencies where it might be dissipated more quickly. Motivation for this study stems from the need to have accurate models of high-precision space structures. Because friction at connecting joints plays a major role in the damping capacity of the structure, a good understanding of this mechanism is necessary to predict the vibratory response and enhance the energy dissipation of the structure. Simulation results of a dynamic system with LuGre friction show that the system is relatively well-conditioned when the slip velocity is small, and ill-conditioned for large slip velocities. Furthermore, the most efficient numerical method to simulate this system is determined to be an implicit integration scheme. To study the energy transfer and dissipation, two models of a jointed structure with friction are considered. Results from the steady-state forced responses of the two structural systems indicate that friction converted low frequency, single harmonic excitation to multi-harmonic response through internal resonances. However, differences in energy dissipation results between the models show that the response of a frictional system is highly sensitive to system parameters and friction laws. Conclusions and suggestions for future research are also discussed.
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Söderberg, Anders. "Interface modeling - friction and wear." Doctoral thesis, KTH, Maskinkonstruktion (Avd.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9861.

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The general trend toward increased use of computer models and simulations during product development calls for accurate and reliable product models. The function of many products relies on contact interfaces between interacting components. Simulating the behavior of such products requires accurate models of both components and interfaces. Depending on the purpose of the simulation, interface models of different degrees of detail are needed. In simulating very large systems with many interfaces, it might be computationally expensive to integrate detailed models of each individual interface. Condensed models, or abstractions, that describe the interface properties with the fewest degrees of freedom are therefore required. This thesis deals with the modeling and simulation of mechanical interfaces in a systems context. The five appended papers discuss the issue from both the simulation and tribological points of view. The aim is to study how friction and wear can be modeled in the behavioral simulation of technical systems and to discuss the convenience and applicability of using different types of models as building blocks of a system model in simulations. Paper A reviews existing friction models of sliding contacts under different running conditions. Paper B uses a simplified contact model, the elastic foundation model, to model friction in a boundary-lubricated rolling and sliding contact. The model is integrated into a dynamic rigid body model of a mechanical system, and the system behavior is simulated. Paper C discusses the application of the elastic foundation model to rough surface contact problems and investigates how the error in its results depends on surface roughness. Papers D and E address how the wear of the contact surfaces at the pad-to-rotor interface in a passenger car disc brake can be simulated using finite element analysis (FEA).
QC 20100811
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Thon, Bjørn Olav. "Friction Models for Oscillating Flow in a U-tube." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24656.

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The basic theory of friction in pipe flow was reviewed in the first part of this thesis. Using the results from this review, steady state friction relations were derived for laminar and turbulent pipe flow.Steady state turbulent friction relations were tested in 1D simulations of oscillating flow in a U-tube with a constant inner diameter. The results show that steady friction relations do not provide sufficient damping compared to experimental data. In order to improve the simulation results, systematic tests of some common dynamic friction relations were conducted. The concluding solution to the friction issue is a combination of laminar and turbulent friction relations, with a dynamic correction. The new friction relation was tested in 1D simulations of oscillating flow in a U-tube with a constant inner diameter. Results show that there is very good accordance between simulations and experimental data. The computational results were validated by experimental data from flow cases of varying Reynolds numbers and three different liquids.In the second part of this thesis, experimental work was conducted on a U-tube with an inner diameter change at the bottom of the bend. The damping of the oscillations was observed to be much greater than in the U-tube with a constant inner diameter. A computer program for image analysis was developed to allow for continuous measurements of the liquid interface level in the U-tube experiments. The program returned satisfying results, both with respect to accuracy and reliability. However, it was concluded that the results from the program could have been better if the U-tube had been made from another material.Simulations of oscillating flow in the U-tube with an inner diameter change were done in order to further investigate the new dynamic friction relation. Comparisons of simulated and experimental results indicated that the friction loss in the diameter change coupling caused inaccuracies in the simulations.
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Colville, Kevin William. "Friction models in the solution of nonstationary contact problems." Master's thesis, University of Cape Town, 1993. http://hdl.handle.net/11427/17334.

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Bibliography: pages 82-83.
In most implementations of the finite element method for the solution of contact problems the model of friction used is the classic Amontons-Coulomb. This dissertation is an attempt to rectify the current situation by considering four more advanced friction models, and coding them in FORTRAN for use with the finite element program ABAQUS. The new models are: a quasi-steady-state sliding model proposed by Zhang, Moslehy and Rice; a nonlinear pressure-dependent model proposed by Wriggers, vu Van and Stein; and a model that includes a film of lubricant proposed by Wilson, Hsu and Huang. The friction models are described in detail, including the algorithmic implementation. The contact problem is then formulated in the Total Lagrangian and Updated Lagrangian formulations for contact between an elastic-plastic (Mises plasticity) body and a rigid tool. The variational (weak) form of the formulation is given and this is then discretised by the finite element method. To test and compare the models three common metal forming processes are simulated: hemispherical punching of a disk, two-dimensional plane strain and three-dimensional cold rolling of a strip, and axisymmetric cup deep-drawing. The results are presented in the form of contour plots of the second invariant of stress (Mises), and the plastic yield and maximum stress. Also graphs for the thickness strain are given. These results are presented for each combination of friction model and process to allow easy comparison of frictional behaviour.
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Kim, Dooroo. "Dynamic modeling of belt drives using the elastic/perfectly-plastic friction law." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29637.

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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2010.
Committee Chair: Leamy, Michael; Committee Member: Costello, Mark; Committee Member: Ferri, Aldo. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Sextro, Walter. "Dynamical contact problems with friction : models, methods, experiments and applications /." Berlin Heidelberg New York, NY Springer, 2002. http://deposit.d-nb.de/cgi-bin/dokserv?id=2889583&prov=M&dok_var=1&dok_ext=htm.

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Sextro, Walter. "Dynamical contact problems with friction : models, methods, experiments and applications /." Berlin [u.a.] : Springer, 2007. http://www.loc.gov/catdir/toc/fy0711/2006940067.html.

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Sun, Tek-kei, and 孫廸麒. "Numerical modeling of skin friction and penetration problems in geotechnical engineering." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/195991.

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Numerical modeling using finite element method (FEM) is well-recognized as a powerful method for both engineers and researchers to solve boundary value problems. In the modeling of geotechnical problems, the analyses are often limited to simple static problems with either steady-state effective or total stress approach while the transient response (development and dissipation of excess pore water pressure, uex) is seldom considered. Besides, infinitesimal small soil deformation is usually assumed. The simulation is further complicated when the soil-structure interaction problems involve significant soil displacements; like a pile subject to negative skin friction (NSF) and a cone/pile penetration. However, conventional FEM analysis prematurely terminates due primarily to excessive mesh distortion. One could see that simulating a transient problem with large deformation and distortion remains a great challenge. In this study, advanced FE simulations are performed to give new insights into the problems of (1) a pile subject to NSF; and (2) a cone penetration. The transient response of the NSF problem is modeled with the fluid-coupled consolidation technique and geometric nonlinearity. The fluid-coupled cone penetration problem is modeled with a newly developed adaptive approach. The NSF and cone penetration simulations involve complex soil-structure interface modeling. Two types of modified interface responses are developed and verified which consider fluid coupling. The developed algorithm is applied to back analyze a case history of a pile subject to NSF induced by surcharge loading. Promising results were shown. Development of dragload and neutral plane (NP) with time is studied. NP locates at 75% of the pile embedded length (D) in long-term. Next, a parametric study is performed to investigate the influences of pile geometries, ground compressibility and loading conditions towards the pile responses. The long-term NP locates at around 0.55D to 0.65D in the studied engineering scenarios. The maximum downdrag can be up to 10% of the pile diameter. NP shifts upward when the head load increases. A simple design chart is proposed which helps engineers to estimate the long-term axial load distribution. An illustrative example is given to demonstrate the application and performance of the chart. The study is extended to investigate the cone penetration problem. An advanced adaptive method is developed and implemented into the FE package ABAQUS to resolve the problems of numerical instability, excessive mesh distortion and premature termination. The proposed method is verified by modeling a ground consolidation problem. Next, total stress back analysis of cone penetration is conducted with the proposed method. The development of cone factor predicted by the proposed method gives a better match with the laboratory result when comparing with the built-in ALE method. Next, the development and dissipation of uex during cone advancing with the proposed method and fluid-coupled technique is investigated. uex develops dramatically around the cone tip. The soil permeability is back calculated from the dissipation test and agrees well with the input value. It is believed that the construction effects of a press-in pile and the subsequence NSF on that pile can be modeled by utilizing the finding of this study.
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Civil Engineering
Doctoral
Doctor of Philosophy
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Serafin, Stefania. "The sound of friction : real time models, playability and musical applications /." May be available electronically:, 2004. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Books on the topic "Friction models"

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Buttà, Paolo, Guido Cavallaro, and Carlo Marchioro. Mathematical Models of Viscous Friction. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14759-8.

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Zmitrowicz, Alfred. Constitutive modelling of anisotropic phenomena of friction, wear and frictional heat. Gdańsk: Instytut Maszyn Przepływowych PAN, 1993.

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Rakowski, Wiesław A. Istota procesu kinetycznego tarcia zewnętrznego oraz jego modelowanie i symulacja cyfrowa. Kraków: Akademia Górniczo-Hutnicza im. S. Staszica w Krakowie, 1989.

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Tanner, John A. Computational methods for frictional contact with applications to the space shuttle orbiter nose-gear tire: Development of frictional contact algorithm. Hampton, Va: Langley Research Center, 1996.

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Tanner, John A. Computational methods for frictional contact with applications to the space shuttle orbiter nose-gear tire: Comparisons of experimental measurements and analytical predictions. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1996.

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United States. National Aeronautics and Space Administration., ed. Entrance and exit region friction factor models for annular seal analysis. College Station, Tex: Texas A&M University, Turbomachinery Laboratory, Mechanical Engineering Dept., 1988.

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Sheng, Gang. Friction-induced vibrations and sound: Principles and applications. Boca Raton: CRC Press, 2000.

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Lacki, Piotr. Modelowanie tarcia w procesach objętościowej obróbki plastycznej. Częstochowa: Wydawn. Politechniki Częstochowskiej, 2010.

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Crum, Douglas A. Rotational failure mechanisms using multiple friction circles for stablility analysis. Washington, D.C. (2401 E St., N.W., Washington 20241-0001): U.S. Dept. of the Interior, Bureau of Mines, 1991.

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Geological Survey (U.S.), ed. Simple models for the estimation and measurement of frictional heating by an earthquake. [Denver, Colo.?]: U.S. Dept. of the Interior, Geological Survey, 1986.

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Book chapters on the topic "Friction models"

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Mróz, Zenon. "Contact Friction Models and Stability Problems." In Friction and Instabilities, 179–232. Vienna: Springer Vienna, 2002. http://dx.doi.org/10.1007/978-3-7091-2534-2_5.

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Sørensen, Georg. "Inertia and development models." In The Necessity of Friction, 159–77. Heidelberg: Physica-Verlag HD, 1993. http://dx.doi.org/10.1007/978-3-642-95905-9_9.

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Tseitlin, A. I., and A. A. Kusainov. "Hereditary Models of Internal Friction." In Role of Internal Friction in Dynamic Analysis of Structures, 157–208. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203740408-6.

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Shillor, Meir, Mircea Sofonea, and Józef Joachim Telega. "2 Evolution Equations, Contact and Friction." In Models and Analysis of Quasistatic Contact, 9–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-44643-9_2.

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Jahanmir, Said. "Predictive Models for Sliding Wear." In Approaches to Modeling of Friction and Wear, 135–38. New York, NY: Springer New York, 1988. http://dx.doi.org/10.1007/978-1-4612-3814-0_21.

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Zhang, Yunzhi, Xianmin Zhang, and Junyang Wei. "Characterization of Presliding with Different Friction Models." In Intelligent Robotics and Applications, 366–76. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-13963-0_37.

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Tseitlin, A. I., and A. A. Kusainov. "Elementary Models for Frequency-Independent Internal Friction." In Role of Internal Friction in Dynamic Analysis of Structures, 94–117. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203740408-4.

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Ciulli, Enrico. "Friction Models for a Sustainable Design: Friction Coefficient in Lubricated Conformal Pairs." In Proceedings of I4SDG Workshop 2023, 199–208. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-32439-0_23.

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Plaschka, E. H., K. Akutagawa, and J. J. C. Busfield. "Evaluating tyre tread friction using a road-wear simulator." In Constitutive Models for Rubber XII, 477–82. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003310266-78.

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Filippov, Alexander E., and Valentin L. Popov. "Study of Dynamics of Block-Media in the Framework of Minimalistic Numerical Models." In Springer Tracts in Mechanical Engineering, 143–68. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_7.

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AbstractOne of the principal methods of preventing large earthquakes is stimulation of a large series of small events. The result is a transfer of the rapid tectonic dynamics in a creep mode. In this chapter, we discuss possibilities for such a transfer in the framework of simplified models of a subduction zone. The proposed model describes well the basic characteristic features of geo-medium behavior, in particular, statistics of earthquakes (Gutenberg Richter and Omori laws). Its analysis shows that local relatively low-energy impacts can switch block dynamics from stick–slip to creep mode. Thus, it is possible to change the statistics of seismic energy release by means of a series of local, periodic, and relatively low energy impacts. This means a principal possibility of “suppressing” strong earthquakes. Additionally, a modified version of the Burridge-Knopoff model including a simple model for state dependent friction force is derived and studied. The friction model describes a velocity weakening of friction between moving blocks and an increase of static friction during stick periods. It provides a simplified but qualitatively correct stability diagram for the transition from smooth sliding to a stick–slip behavior as observed in various tribological systems. Attractor properties of the model dynamic equations were studied under a broad range of parameters for one- and two-dimensional systems.
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Conference papers on the topic "Friction models"

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"Tyres and friction." In The 10th European Conference on Constitutive Models for Rubber (ECCMR X). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315223278-108.

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"MACROSCOPIC MODELS FOR ACTIVE CONTROL OF FRICTION AND FRICTIONAL ACTUATORS." In Fizicheskaya mezomekhanika. Materialy s mnogourovnevoy ierarkhicheski organizovannoy strukturoy i intellektual'nye proizvodstvennye tekhnologii. Tomsk State University, 2020. http://dx.doi.org/10.17223/9785946219242/24.

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Zhao, Ya-hui, Li-ling Han, Rui Zhang, Cheng-liang Pan, and Lian-dong Yu. "Dynamic responses of piezoelectric inertia friction motors with different friction models." In 2016 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA). IEEE, 2016. http://dx.doi.org/10.1109/spawda.2016.7830040.

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Moder, Jakob, and Florian Grün. "Contact Models for Mixed Friction Simulation." In MultiScience - XXX. microCAD International Multidisciplinary Scientific Conference. University of Miskolc, 2016. http://dx.doi.org/10.26649/musci.2016.083.

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de Wit, C. Canudas, H. Olsson, K. J. Astrom, and P. Lischinsky. "Dynamic Friction Models and Control Design." In 1993 American Control Conference. IEEE, 1993. http://dx.doi.org/10.23919/acc.1993.4793212.

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Ahmad, Aftab, Kjell Andersson, Ulf Sellgren, and Max Boegli. "Evaluation of Friction Models for Haptic Devices." In ASME 2013 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/dscc2013-3982.

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In this work different friction models are evaluated to determine how well these models are suited for performance simulation and control of a 6-DOF haptic device. The studied models include, Dahl model, LuGre model, Generalized Maxwell slip model (GMS), smooth Generalized Maxwell slip model (S-GMS) and Differential Algebraic Multistate (DAM) friction model. These models are evaluated both numerically and experimentally with an existing 6-DOF haptic device that is based on a Stewart platform. In order to evaluate how well these models compensate friction, a model-based feedback friction compensation strategy along with a PID controller were used for position tracking accuracy. The accuracies of the friction compensation models are examined separately for both low-velocity and high-velocity motions of the system. To evaluate these models, we use criteria based on fidelity to predict realistic friction phenomena, easiness to implement, computational efficiency and easiness to estimate the model parameters. Experimental results show that friction compensated with GMS, S-GMS and DAM models give better accuracy in terms of standard deviation, Root Mean Squared Error, and maximum error between a reference and measured trajectory. Based on the criteria of fidelity, ease of implementation and ease to estimate model parameters, the S-GMS model, which represents a smooth transition between sliding and pre-sliding regime through an analytical set of differential equations, is suggested.
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Courtecuisse, Hadrien, Yinoussa Adagolodjo, Herve Delingette, and Christian Duriez. "Haptic rendering of hyperelastic models with friction." In 2015 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS). IEEE, 2015. http://dx.doi.org/10.1109/iros.2015.7353432.

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Adams, George G. "Asperity-Based Models of Micro-Scale Friction." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64386.

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As surfaces become smoother and loading forces decrease in applications such as MEMS, NEMS, and magnetic recording devices, the size and number of the asperity contacts which comprise the real contact area continues to decrease. The tangential force which is measured between two sliding bodies is the combined result of friction forces which are present in a very large number of nano and micro scale asperity contacts. Recent experiments as well as modeling have shown considerable scale-dependence and nonlinear load-dependence of the friction force. These models will be reviewed and discussed.
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Kuang, Zhian, Zhiyuan Yu, Yuping Huang, and Guanghui Sun. "Simulations of friction models for linear motors." In IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2017. http://dx.doi.org/10.1109/iecon.2017.8217326.

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Song, Xubin, and Daniel G. Smedley. "Static Friction Models for Vehicle Simulation Study." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14756.

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The history of the challenge of friction modeling is briefly reviewed. Then this paper focuses on the modeling and simulation study of the friction related dynamics in the Simulink® environment, because Matlab®/Simulink® are popular engineering software tools for both industry and academia. Matlab® and Simulink® are the proprietary products of MathWorks, Inc. In this paper, the static friction models are studied through Simulink® by applying fixed and variable step sizes. The comparison shows that the static Karnopp model is not only numerically tractable but also can be inclusive of the fundamental friction characteristics of both stick slip and correct friction predictions. Finally this paper presents an improved Karnopp model for clutch modeling with the use of Simulink®, and the simulation shows that this model is computationally tractable with smooth dynamics.
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Reports on the topic "Friction models"

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Ziegler, Nancy, Nicholas Webb, Adrian Chappell, and Sandra LeGrand. Scale invariance of albedo-based wind friction velocity. Engineer Research and Development Center (U.S.), May 2021. http://dx.doi.org/10.21079/11681/40499.

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Obtaining reliable estimates of aerodynamic roughness is necessary to interpret and accurately predict aeolian sediment transport dynamics. However, inherent uncertainties in field measurements and models of surface aerodynamic properties continue to undermine aeolian research, monitoring, and dust modeling. A new relation between aerodynamic shelter and land surface shadow has been established at the wind tunnel scale, enabling the potential for estimates of wind erosion and dust emission to be obtained across scales from albedo data. Here, we compare estimates of wind friction velocity (u*) derived from traditional methods (wind speed profiles) with those derived from the albedo model at two separate scales using bare soil patch (via net radiometers) and landscape (via MODIS 500 m) datasets. Results show that profile-derived estimates of u* are highly variable in anisotropic surface roughness due to changes in wind direction and fetch. Wind speed profiles poorly estimate soil surface (bed) wind friction velocities necessary for aeolian sediment transport research and modeling. Albedo-based estimates of u* at both scales have small variability because the estimate is integrated over a defined, fixed area and resolves the partition of wind momentum be-tween roughness elements and the soil surface. We demonstrate that the wind tunnel-based calibration of albedo for predicting wind friction velocities at the soil surface (us*) is applicable across scales. The albedo-based approach enables consistent and reliable drag partition correction across scales for model and field estimates of us* necessary for wind erosion and dust emission modeling.
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Ward, Andrew, Anthony Falls, and Craig Rutland. Development of smartphone-based semi-prepared runway operations (SPRO) models and methods. Engineer Research and Development Center (U.S.), December 2021. http://dx.doi.org/10.21079/11681/42500.

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The U.S. Army Engineer Research and Development Center (ERDC) has developed a method for predicting surface friction response by use of ground vehicles equipped with deceleration-based measurement devices. Specifically, the ERDC has developed models and measurement methods between the Findlay Irvine Mk2 GripTester and a variety of deceleration measurement devices: Bowmonk AFM2 Mk3, Xsens MTi-G-710, two Android smartphones, and two iOS smartphones. These models show positive correlation between ground vehicle deceleration and fixed-slip surface continuous surface friction measurement. This effort extends prior work conducted by the U.S. Army ERDC in developing highly correlative models between the Findlay Irvine Mk2 GripTester and actual C-17 braking deceleration, measured via the runway condition rating (RCR) system. The models and measurement methods detailed here are of considerable use to semi-prepared airfield managers around the world needing to measure safe landing conditions following inclement weather. This work provides the tools necessary for airfield managers to quantify safe landing conditions for C-17 aircraft by using easily obtainable equipment and simple test standards.
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Lever, James, Susan Taylor, Arnold Song, Zoe Courville, Ross Lieblappen, and Jason Weale. The mechanics of snow friction as revealed by micro-scale interface observations. Engineer Research and Development Center (U.S.), December 2021. http://dx.doi.org/10.21079/11681/42761.

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The mechanics of snow friction are central to competitive skiing, safe winter driving and efficient polar sleds. For nearly 80 years, prevailing theory has postulated that self-lubrication accounts for low kinetic friction on snow: dry-contact sliding warms snow grains to the melting point, and further sliding produces meltwater layers that lubricate the interface. We sought to verify that self-lubrication occurs at the grain scale and to quantify the evolution of real contact area to aid modeling. We used high-resolution (15 μm) infrared thermography to observe the warming of stationary snow under a rotating polyethylene slider. Surprisingly, we did not observe melting at contacting snow grains despite low friction values. In some cases, slider shear failed inter-granular bonds and produced widespread snow movement with no persistent contacts to melt (μ < 0.03). When the snow grains did not move and persistent contacts evolved, the slider abraded rather than melted the grains at low resistance (μ < 0.05). Optical microscopy revealed that the abraded particles deposited in air pockets between grains and thereby carried heat away from the interface, a process not included in current models. Overall, our results challenge whether self-lubrication is indeed the dominant mechanism underlying low snow kinetic friction.
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Michaels, Michelle, Theodore Letcher, Sandra LeGrand, Nicholas Webb, and Justin Putnam. Implementation of an albedo-based drag partition into the WRF-Chem v4.1 AFWA dust emission module. Engineer Research and Development Center (U.S.), January 2021. http://dx.doi.org/10.21079/11681/42782.

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Employing numerical prediction models can be a powerful tool for forecasting air quality and visibility hazards related to dust events. However, these numerical models are sensitive to surface conditions. Roughness features (e.g., rocks, vegetation, furrows, etc.) that shelter or attenuate wind flow over the soil surface affect the magnitude and spatial distribution of dust emission. To aide in simulating the emission phase of dust transport, we used a previously published albedo-based drag partition parameterization to better represent the component of wind friction speed affecting the immediate soil sur-face. This report serves as a guide for integrating this parameterization into the Weather Research and Forecasting with Chemistry (WRF-Chem) model. We include the procedure for preprocessing the required input data, as well as the code modifications for the Air Force Weather Agency (AFWA) dust emission module. In addition, we provide an example demonstration of output data from a simulation of a dust event that occurred in the Southwestern United States, which incorporates use of the drag partition.
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LeGrand, Sandra, Theodore Letcher, Gregory Okin, Nicholas Webb, Alex Gallagher, Saroj Dhital, Taylor Hodgdon, Nancy Ziegler, and Michelle Michaels. Application of a satellite-retrieved sheltering parameterization (v1.0) for dust event simulation with WRF-Chem v4.1. Engineer Research and Development Center (U.S.), May 2023. http://dx.doi.org/10.21079/11681/47116.

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Employing numerical prediction models can be a powerful tool for forecasting air quality and visibility hazards related to dust events. However, these numerical models are sensitive to surface conditions. Roughness features (e.g., rocks, vegetation, furrows, etc.) that shelter or attenuate wind flow over the soil surface affect the magnitude and spatial distribution of dust emission. To aide in simulating the emission phase of dust transport, we used a previously published albedo-based drag partition parameterization to better represent the component of wind friction speed affecting the immediate soil sur-face. This report serves as a guide for integrating this parameterization into the Weather Research and Forecasting with Chemistry (WRF-Chem) model. We include the procedure for preprocessing the required input data, as well as the code modifications for the Air Force Weather Agency (AFWA) dust emission module. In addition, we provide an example demonstration of output data from a simulation of a dust event that occurred in the Southwestern United States, which incorporates use of the drag partition.
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Pullammanappallil, Pratap, Haim Kalman, and Jennifer Curtis. Investigation of particulate flow behavior in a continuous, high solids, leach-bed biogasification system. United States Department of Agriculture, January 2015. http://dx.doi.org/10.32747/2015.7600038.bard.

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Recent concerns regarding global warming and energy security have accelerated research and developmental efforts to produce biofuels from agricultural and forestry residues, and energy crops. Anaerobic digestion is a promising process for producing biogas-biofuel from biomass feedstocks. However, there is a need for new reactor designs and operating considerations to process fibrous biomass feedstocks. In this research project, the multiphase flow behavior of biomass particles was investigated. The objective was accomplished through both simulation and experimentation. The simulations included both particle-level and bulk flow simulations. Successful computational fluid dynamics (CFD) simulation of multiphase flow in the digester is dependent on the accuracy of constitutive models which describe (1) the particle phase stress due to particle interactions, (2) the particle phase dissipation due to inelastic interactions between particles and (3) the drag force between the fibres and the digester fluid. Discrete Element Method (DEM) simulations of Homogeneous Cooling Systems (HCS) were used to develop a particle phase dissipation rate model for non-spherical particle systems that was incorporated in a two-fluid CFDmultiphase flow model framework. Two types of frictionless, elongated particle models were compared in the HCS simulations: glued-sphere and true cylinder. A new model for drag for elongated fibres was developed which depends on Reynolds number, solids fraction, and fibre aspect ratio. Schulze shear test results could be used to calibrate particle-particle friction for DEM simulations. Several experimental measurements were taken for biomass particles like olive pulp, orange peels, wheat straw, semolina, and wheat grains. Using a compression tester, the breakage force, breakage energy, yield force, elastic stiffness and Young’s modulus were measured. Measurements were made in a shear tester to determine unconfined yield stress, major principal stress, effective angle of internal friction and internal friction angle. A liquid fludized bed system was used to determine critical velocity of fluidization for these materials. Transport measurements for pneumatic conveying were also assessed. Anaerobic digestion experiments were conducted using orange peel waste, olive pulp and wheat straw. Orange peel waste and olive pulp could be anaerobically digested to produce high methane yields. Wheat straw was not digestible. In a packed bed reactor, anaerobic digestion was not initiated above bulk densities of 100 kg/m³ for peel waste and 75 kg/m³ for olive pulp. Interestingly, after the digestion has been initiated and balanced methanogenesis established, the decomposing biomass could be packed to higher densities and successfully digested. These observations provided useful insights for high throughput reactor designs. Another outcome from this project was the development of low cost devices to measure methane content of biogas for off-line (US$37), field (US$50), and online (US$107) applications.
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Kedzierski, Mark A., and Donggyu Kang. Horizontal convective boiling of R1234yf, R134a, and R450A within a micro-fin tube :. Gaithersburg, MD: National Institute of Standards and Technology (U.S.), August 2017. http://dx.doi.org/10.6028/nist.tn.1966.

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This report presents local convective boiling heat transfer and Fanning friction factor measurements in a micro-fin tube for R134a and two possible low global warming potential (GWP) refrigerant replacements for R134a: R1234yf and R450A. Test section heating was achieved with water in either counterflow or in parallel flow with the test refrigerant to provide for a range of heat fluxes for each thermodynamic quality. An existing correlation from the literature for single and multi-component mixtures was shown to not satisfactorily predict the convective boiling measurements for flow qualities greater than 40 %. Accordingly, a new correlation was developed specifically for the test fluids of this study so that a fair comparison of the heat transfer performance of the low GWP refrigerants to that of R134a could be made. The new correlation was used to compare the heat transfer coefficient of the three test fluids at the same heat flux, saturated refrigerant temperature, and refrigerant mass flux. The resulting example comparison, for the same operating conditions, showed that the heat transfer coefficient of the multi-component R450A and the single-component R1234yf were, on average, 15 % less and 5 % less, respectively, than that of the single-component R134a. Friction factor measurements were also compared to predictions from an existing correlation. A new correlation for the friction factor was developed to provide a more accurate prediction. The measurements and the new models are important for the evaluation of potential low-GWP refrigerants replacements for R134a.
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8

Kenamond, Mark A. (U) Multi-Scale Friction Model in FLAG. Office of Scientific and Technical Information (OSTI), June 2014. http://dx.doi.org/10.2172/1133757.

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Rivetta, Claudio H., and Sten Hansen. Friction model of the 2.5mts SDSS telescope. Office of Scientific and Technical Information (OSTI), February 1998. http://dx.doi.org/10.2172/598758.

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Davies, Nicholas R., and Peter Julian Blau. Comparison of Frictional Heating Models. Office of Scientific and Technical Information (OSTI), October 2013. http://dx.doi.org/10.2172/1110966.

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