Relevant bibliographies by topics / Sensitivity to the friction coefficient

Academic literature on the topic 'Sensitivity to the friction coefficient'

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Published: 14 March 2023

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Journal articles on the topic "Sensitivity to the friction coefficient"

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Yevtushenko, Aleksander A., Piotr Grzes, and Adam Adamowicz. "The Temperature Mode of the Carbon-Carbon Multi-Disc Brake in the View of the Interrelations of Its Operating Characteristics." Materials 13, no. 8 (April 16, 2020): 1878. http://dx.doi.org/10.3390/ma13081878.

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In this paper, a methodology for conducting a computer simulation of the frictional heating process of a multi-disc braking system is proposed. The single braking of a system of three identical discs made of carbon–carbon (C/C) carbon frictional composite material (CFCM) is considered. In order to determine the operational characteristics of the brake, a heat dynamics of friction (HDF) system of equations is formulated, which takes into account the contact pressure rise time, thermal sensitivity of the C/C material, the change in the coefficient of friction during braking, the parameters of the friction surface’s microgeometry and the mutual influence of sliding velocity and temperature. A numerical solution using the finite element method (FEM) of the HDF system of equations allows us to determine changes in key braking process characteristics, such as work done, braking torque, friction coefficient, heat transfer coefficient, velocity and temperature. Finally, a comparative analysis of the results obtained for three different time profiles of the coefficient of friction is carried out.
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Qiu, Xiaoli, Xianqiang Cheng, Penghao Dong, Huachen Peng, Yan Xing, and Xin Zhou. "Sensitivity Analysis of Johnson-Cook Material Constants and Friction Coefficient Influence on Finite Element Simulation of Turning Inconel 718." Materials 12, no. 19 (September 25, 2019): 3121. http://dx.doi.org/10.3390/ma12193121.

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The Johnson-Cook (J-C) constitutive model, including five material constants (A, B, n, C, m), and the Coulomb friction coefficient (μ) are critical preprocessed data in machining simulations. Before they become reliable preprocessed data, investigating these parameters’ effect on simulation results benefits parameter-selecting. This paper aims to investigate the different influence of five settings of the J-C constitutive equation and Coulomb friction coefficient on the turning simulation results of Inconel 718 under low-high cutting conditions, including residual stress, chip morphology, cutting force and temperature. A three-dimensional (3-D) finite element model was built, meanwhile, the reliability of the model was verified by comparing the experiment with the simulation. Sensitivity analysis of J-C parameters and friction coefficient on simulation results at low-high cutting conditions was carried out by the hybrid orthogonal test. The results demonstrate that the simulation accuracy of Inconel 718 is more susceptible to strain hardening and thermal softening in the J-C constitutive model. The friction coefficient only has significant effects on axial and radial forces in the high cutting condition. The influences of the coefficient A, n, and m on the residual stress, chip thickness, cutting force and temperature are especially significant. As the cutting parameters increase, the effect of the three coefficients will change visibly. This paper provides direction for controlling simulation results through the adjustment of the J-C constitutive model of Inconel 718 and the friction coefficient.
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Sharifi Miavaghi, Amir, Haleh Kangarlou, and Mehdi Eskandarzade. "Comparison between frictional behavior of the soft and brittle materials at different contact pressures." Lebanese Science Journal 18, no. 1 (June 21, 2017): 98–105. http://dx.doi.org/10.22453/lsj-018.1.098105.

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Coefficient of friction changed significantly by the change in contact pressure. Experimental measurement of the coefficient of friction in different contact pressures can be useful in numerical and analytical analysis of many engineering problems, such as metal forming process. This study dedicated to investigate the sensitivity of the friction coefficient to changes in contact pressures. To aim this goal the special tribometer device has been fabricated and the coefficient of friction of the soft and brittle metals when sliding with a low speed on a rigid body are measured for different contact pressures. The friction sensitivity of the soft (copper and aluminum) and brittle (steel) samples to changes in contact pressure are compared and discussed. The results showed that both brittle and soft metals are highly sensitive for change in contact pressure but their behaviour is slightly different. While the coefficient of friction of the steel sample when sliding on a steel substrate is reduced sharply by a little increase in contact pressure; the coefficient of friction of the soft material when sliding on a steel substrate is reduced slowly depending on the magnetude of the applied normal load.
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BOAZU, Doina. "A Sensitivity Study of the Maximum Stress in a Rubber Circular Ring to the Coefficient of Friction Using FEM." Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science 45, no. 4 (December 15, 2022): 29–35. http://dx.doi.org/10.35219/mms.2022.4.05.

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The paper presents a sensitivity study of a rubber circular ring (O-Ring) depending on the value of the coefficient of friction (design parameter) between the ring and the surfaces between which it is mounted. The response value is the maximum von Mises stress in the rubber ring. The influence of temperature was not taken into account.Through this sensitivity nonlinear analysis using finite element modeling, the correlation between Equivalent maximum Von Mises Stress and Friction coefficient can be established, determining a maximum stress level of the rubber ring to the friction coefficient. This relationship is important for the preload stage of the gasket functioning.
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Wang, Qiang, Youmin Tang, and Henk A. Dijkstra. "An Optimization Strategy for Identifying Parameter Sensitivity in Atmospheric and Oceanic Models." Monthly Weather Review 145, no. 8 (August 2017): 3293–305. http://dx.doi.org/10.1175/mwr-d-16-0393.1.

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A new optimization strategy is proposed to identify the sensitivities of simulations of atmospheric and oceanic models to uncertain parameters. The strategy is based on a nonlinear optimization method that is able to estimate the maximum values of specific parameter sensitivity measures; meanwhile, it takes into account interactions among uncertain parameters. It is tested using the Lorenz’63 model and an intermediate complexity 2.5-layer shallow-water model of the North Pacific Ocean. For the Lorenz’63 model, it is shown that the parameter sensitivities of the model results depend on the initial conditions. For the 2.5-layer shallow-water model used to simulate the Kuroshio large meander (KLM) south of Japan, the optimization strategy reveals that the prediction of the KLM path is insensitive to the uncertainties in the bottom friction coefficient, the interfacial friction coefficient, and the lateral friction coefficient. Rather, the KLM prediction is relatively sensitive to the uncertainties of the reduced gravity representing ocean stratification and the wind stress coefficient.
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Espinosa, H. D., A. J. Patanella, and M. Fischer. "Dynamic Friction Measurements at Sliding Velocities Representative of High-Speed Machining Processes." Journal of Tribology 122, no. 4 (April 17, 2000): 834–48. http://dx.doi.org/10.1115/1.1310331.

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Understanding high speed machining processes requires knowledge of the dynamic friction response at the tool-workpiece interface, the high strain rate response of the workpiece material and its fracture mechanisms. In this paper, a novel experimental technique, consisting in the independent application of an axial static load and a dynamic torque, is used to investigate time resolved dynamic friction. Shear stress wave propagation along an input bar, pressing statically against an output bar, is analyzed. The quasi-static and kinetic friction coefficients of Ti-6Al-4V sliding against 1080 Steel, Al 6061-T6 sliding against 1080 Steel, and Al 6061-T6 sliding against Al 7075-T6, with various surface characteristics, are investigated. Sliding velocities up to 6.9 m/s are achieved. Surface roughness is varied to understand its role on the frictional response of the sliding interfaces. The dependence of friction coefficient on material strain-rate sensitivity is also assessed. Measured friction coefficients compared well with values reported in the literature using other experimental techniques. The experimental methodology discussed in this article provides a robust method for direct measurement of the quasi-static and dynamic friction coefficients representative of high-speed machining, metal-forming and ballistic penetration processes. [S0742-4787(00)01304-7]
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Bahrami Balfeh Teimouri, Atanaz, and Ahad Bagherzadeh Khalkhali. "Stability Control of Narmab Dam and Sensitivity Analysis of Reliability Coefficients." Civil Engineering Journal 4, no. 9 (September 30, 2018): 2197. http://dx.doi.org/10.28991/cej-03091150.

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Static and quasi-static stability analysis of embankment dams is of vital importance in different stages of dam’s design, construction and operation. The stability can be studied using different techniques which are generally analyzed through Limit Equilibrium Method. Base on this main method, the critical slip surface is selected and the shear strength required to counter the slip at the selected surface is obtained and compared with shear strength of the soil at that surface in order to obtain confidence coefficient. In the present research, the Geo-studio Slope/w software that is a geotechnical software based on finite element method and is widely used in geotechnical field, is employed in order to analyze the stability of the body and foundation of Narmab dam in Golestan province. Narmab dam is a homogeneous embankment dam with a height of 60 m, crest length of 807 m and reservoir volume of 115 million cubic meters. The confidence coefficients provided by the software are compared to the permissible confidence coefficients. Moreover, the sensitivity of the confidence coefficients values to the changes in the effective factors, adhesion and internal friction coefficient, is analyzed. The analyses were performed on 8 values (±5, ±10, ±15, ±20) of c and φ and the obtained values of confidence coefficients were compared. In addition, a comparison was made between different methods of stability analysis. According to the static and quasi-static conditions, Narmab dam is stable in all loading stages (End of Construction, First Impounding and Steady State Seepage and In general, only for the static conditions of the end of construction stage, the sensitivity of adhesion is greater than the angle of internal friction, but, in other conditions and stages, the sensitivity of friction angle has more effects.
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Timur, Mustafa, Hilmi Kuşçu, and Hayrettin Toylan. "Design and manufacture of automated controlled test machine detecting braking characteristic of brake lining in vehicles." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 18 (May 6, 2016): 3318–29. http://dx.doi.org/10.1177/0954406216645128.

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This study has been carried out in order to measure friction coefficient of friction materials used in autos through computer program. Variants such as speed, temperature, and pressure have been discussed and the effect of these variants on friction materials of autos. Variants such as speed, temperature, and pressure resulting from various effects in autos have been discussed, the effects of these variants on friction materials have been examined and their friction coefficients have been detected. In the test device whose manufacturing has been completed, temperature value between surface of brake lining and disc used during tests a machinery has been prepared in a way that temperature values are 0–400 ℃, speed values are 0–1400 rev/min, pressure values are 0–1.05 Mpa. In consideration of these dates, it has become possible to constitute friction coefficient–temperature, friction–time and temperature–time diagrams. By benefiting from the tests to be performed through friction coefficient test device, enhancement or progress will be ensured in material selection, technology and theory. Control pf parameters such as speed, temperature, pressure, force, and friction coefficient to be measured are performed easily through test device; moreover, thanks to electronically sensitivity of electronically and mechanical materials used in test device, it is ensured that you can reach the values you want to reach correctly. Friction tests have been carried out on samples having different properties in auto regulative test device. Friction coefficient values of automotive brake linings in the new system design and manufacturing which is carried out, have been in conformity with SAE-J661 Standard and TSE 555-9076 Standard (Turkish Standards Institution). Test results obtained are in parallel with the literature.
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Huynh, Le Hong Thai, and Pavel Němeček. "Sensitivity Analysis and Optimization Disc Brake by Stress Constraints." Applied Mechanics and Materials 52-54 (March 2011): 583–88. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.583.

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In recent years, a lot of studies on brake of car aims to reduce stress, vibration and noise of the brake on vehicle. In this paper presents a sensitivity analysis of pressure and friction coefficient effect to stress of disc brake. Base on this result, an optimization for brake by stress constraints was performed. The results are shown that the contact area between disc brake and pad also it’s stress and pressure. Studies also have shown relationships between pressure, friction coefficient and stress of brake. After that, we optimize the model of disc brake by stress constraints to obtain the new model better. This is a pre study for studies on dynamic and vibration of disc brake.
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Borstad, Christopher P., and D. M. McClung. "Sensitivity analyses in snow avalanche dynamics modeling and implications when modeling extreme events." Canadian Geotechnical Journal 46, no. 9 (September 2009): 1024–33. http://dx.doi.org/10.1139/t09-042.

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We present the first snow avalanche dynamics model simulations to start in the middle of the avalanche path at the maximum expected speed for an extreme event. We first present a sensitivity analysis of the dynamics model to the various model inputs. A single-parameter Coulomb-type friction formulation is used in the model. This formulation is supported by various experiments and full-scale observations of avalanche flow that demonstrate a coupling between the shear and normal forces in flowing snow. The dynamics model is shown to be most sensitive to changes in the friction coefficient. We suggest that the precision in the friction coefficient necessary to confidently use a dynamics model to predict runout distances is higher than the current state of knowledge about avalanche resistance mechanisms. This result leads to the new modeling technique that starts numerical simulations at the midpoint of the length of the avalanche path at maximum speed. The Coulomb friction coefficient is chosen to produce a unique speed profile from this new starting point at maximum speed to a state of rest at an empirically pre-determined runout position. The technique reproduces the observed sharp deceleration of avalanche flow in the runout zone.
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Dissertations / Theses on the topic "Sensitivity to the friction coefficient"

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Butlin, T. S. "Prediction and sensitivity of friction-induced vibration." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597187.

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A simplified system is studied analytically, numerically and experimentally. Predictions are based on a linear stability analysis of two subsystems coupled by friction at a sliding point contact. The model describes any two such linear subsystems, though is predominantly discussed in terms of vehicle brakes. As an example of its generality, it is shown to be equivalent to machine tool vibration. Representative uncertainties of the system dynamics are shown to be significant enough to affect whether or not the model predicts instability. The reliability of predictions are assessed systematically. The validity of limited bandwidth approximations to wide band-width models is tested: the convergence behaviour is non-trivial. While inclusion of sufficient bandwidth generally results in convergence, individual modes can sometimes be important. A first-order perturbation analysis is carried out in order to provide a practical estimate of error bounds for predictions. An extensive experiment was carried out using a pin-on-disc test rig to quantify uncertainty, assess repeatability and investigate whether high sensitivity could be experimentally observed. Repeated transfer function measurements of the uncoupled subsystems were made of two fundamentally different pin assemblies, symmetrical and asymmetrical, in the presence of different perturbation masses. Sliding contact tests were carried out with the aim of generating a large number of squeal initiations. Their growth rates and frequencies were estimated. This allowed a direct comparison of predictions with experimental results, enabling informed development of the modelling details. There was compelling evidence that both contact stiffness and a velocity-dependent coefficient of friction were essential features of the model to predict observed instabilities.
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Grzeskiewicz, Ronald. "Effect of hydrogen on the coefficient of friction of iron." Thesis, This resource online, 1988. http://scholar.lib.vt.edu/theses/available/etd-04122010-083727/.

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Dorton, David W. "Experimental evaluation of effective friction coefficient for liquid ring seals." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08042009-040326/.

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Lång, Marcus. "Static Friction in Slip Critical Bolt Joints : Coefficient of Friction in Steel, Aluminium and ED Coated Steel." Thesis, Karlstads universitet, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-55223.

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This project was performed together with ÅF Industry AB in Trollhättan, Sweden. ÅF’s expertise in Trollhättan is oriented towards the automotive industry. It was conducted within the section of CAE and safety where they, for instance, dimension bolt joints in the cars. Bolt joints play an important role in the automotive industry. Slip critical bolt joints are used widely throughout the vehicles. With lack of good test data, the bolt joints need to be dimensioned conservatively. This may lead to that bolt joints are over-dimensioned, adding more mass to the car. On the contrary, the availability of reliable test data enables designers to optimize joint dimensions to achieve a safe design with minimized mass. A mechanical testing configuration has been designed as well as a testing procedure for a test to determine the static friction value between mating surfaces in bolt joints. The testing configuration has been used to perform tests to find the static friction coefficient in different materials. The study contains varied combinations of steel, aluminium and ED-Coated steel. The study resulted in tables with levels of probability. The developed test configuration is robust and relatively simple to use and is recommended for further use. For improved statistical significance, it was noted that more samples should be used than was used in this study. The aluminium has a smoother surface finish and that could be the reason why its coefficient of friction is lower than steel. It is therefore considered important to also include surface roughness when presenting coefficient of friction results.
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Peterson, Eric W. "Tire-Road Friction Coefficient Estimation Using a Multi-scale, Physics-based Model." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/51148.

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The interaction between a tire and road surface is of critical importance as the motion of a car in both transient and steady-state maneuvers is predicated on the friction forces generated at the tire-road interface. A general method for predicting friction coefficients for an arbitrary asphalt pavement surface would be an invaluable engineering tool for designing many vehicle safety and performance features, tire design, and improving asphalt-aggregate mixtures used for pavement surfaces by manipulating texture. General, physics-based methods for predicting friction are incredibly difficult, if not impossible to realize—However, for the specific case of rubber sliding across a rough surface, the primary physical mechanisms responsible for friction, notably rubber hysteresis, can be modeled. The objective of the subsequent research is to investigate one such physics model, referred to as Persson Theory, and implement the constitutive equations into a MatLab® code to be solved numerically. The model uses high-resolution surface measurements, along with some of the physical properties of rubber as inputs and outputs the kinetic friction coefficient. The Persson model was successfully implemented into MatLab® and high resolution measurements (from optical microscopy and imaging software) were obtained for a variety of surfaces. Friction coefficients were calculated for each surface and compared with measured friction values obtained from British Pendulum testing. The accuracy and feasibility of the Persson model are discussed and results are compared with a simpler, semi-empirical indenter model. A brief discussion of the merits and drawbacks of the Persson model are offered along with recommendations for future research based on the information acquired from the present study.
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Oliver, William B. "An experimental investigation of the static coefficient of friction for sheetpile interlocks." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/104522.

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Koubek, Radek, and Karolina Dedicova. "Friction of wood on steel." Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-35094.

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This thesis deals with the experimental description of friction between steel and wood materials, specifically laminated veneer lumber (LVL) and pine wood with two types of annual rings. It studies the influence of a number of different parameters on the coefficient of friction such as contact pressure, moisture content, fiber orientation in relation to the load direction, steel surface roughness, and horizontal load rate. First, the theoretical mechanical and physical properties as well as the coefficient of friction itself are described. This is followed by the description of the test setup including the test method and how the obtained data is exported, handled and processed and how the coefficient of friction is determined. The results study the influence of different parameters and show that the coefficients of friction for the smooth sliding plate tests vary in between 0.1 and 0.3, whereas tests with the rough sliding plate vary around 0.7. Factors influencing the coefficient of friction were found to be the different moisture content under all tested pressures, the different fiber direction under low contact pressure, the contact pressure itself, though under higher pressures the influence was found to be low, and the horizontal load rate under low pressures. The outcomes are further discussed in the discussion chapter.
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Pažítková, Monika. "Tření v tvářecích procesech." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416430.

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This thesis deals with tests of forming operations, which are used to determine coefficient of friction. In the theoretical part of thesis, the individual tests are described in details, with the greatest emphasis on the upsetting test. In the experimental part of thesis was perform upsetting test on the cylindrical and ring samples. Coefficient of friction of the cylindrical samples was determined by a calculation method and ring samples were evaluated using diagram of calibration. The thesis includes comparison of the result received on lubricant and unlubricated samples and method for determined coefficient of friction. Graphite Delta 144 was used as a lubricant. This result show that the lubricant has a positive effect on forming process.
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Monk, Stuart. "The role of friction coefficient on launch conditions in high-loft angle golf clubs." Thesis, University of Birmingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433489.

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Koller, Anton W. "The friction coefficient of soft contact lens surfaces in relation to comfort and performance." Thesis, City University London, 2014. http://openaccess.city.ac.uk/13791/.

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The soft contact lenses of today are made from a variety of hydrogel materials. These materials have different properties in terms of water content, monomers, hardness and other tensile characteristics. It is likely that the frictional properties also vary between materials. It is known that constituents of the tear film interact with contact lens materials to form a biofilm on the lens surface. The hypothesis of this research is that although the frictional properties of lens materials may vary these properties do not affect the comfort and performance of the lenses in vivo. A tribometer is a device to measure the coefficient of friction of materials. There was no commercially available tribometer designed specifically for use with contact lens materials, so one was constructed and validated against standard solid materials. The same equipment was used to determine the friction coefficients of five contemporary soft lens materials under different conditions of lubrication but, unlike other tribometers, this unique design simulated human blinking as far as possible. The experimental friction coefficients varied widely from 0.27 to 5.89 under different conditions of lubrication. The largest variation between materials was seen using the most viscous lubricant. For the in vivo studies the author coordinated the manufacture of 250 contact lenses, which were lathe cut and polished to a standard design, achieving exceptionally tight tolerances, using the same five materials. This rigourous process was carried out to minimise variations in the geometry of each contact lens. Subjects were screened to minimise ocular heterogeneities between subjects. Clinical performance of each lens was assessed using comfort, contrast sensitivity, visual acuity, entoptic phenomena, non-invasive tear break-up time and lens movement on the eye. In a clinical environment none of these parameters showed any associations with the coefficients of friction found in vitro, apart from a moderate correlation (rho = 0.5) between lens movement and the coefficient of friction under borderline friction conditions. In conclusion, the findings of this research support the hypothesis that frictional properties of soft lenses do not affect comfort and performance in vivo.
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Books on the topic "Sensitivity to the friction coefficient"

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Forland, Kathryn A. Kinetic friction coefficient of ice. [Hanover, N.H.]: US Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, 1985.

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B, Oswald Fred, Townsend Dennis P, and United States. National Aeronautics and Space Administration., eds. Measurement of gear tooth dynamic friction. [Washington, DC]: National Aeronautics and Space Administration, 1996.

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Healy, Alan Gerard. An investigation of methods of measuring the coefficient of friction of roadstone. [London]: Queen Mary and Westfield College, 1997.

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Nagel, F. A method for the approximate calculation of the skin friction coefficient of horizontal wavy plates. Rhode Saint Genese, Belgium: von Karman Institute for Fluid Dynamics, 1987.

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Miyoshi, Kazuhisa. Durability evaluation of selected solid lubricating films. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.

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L, Thom R., and George C. Marshall Space Flight Center., eds. Database for the tribological properties of self-lubricating materials. Marshall Space Flight Center, Ala: National Aeronautics and Space Administration, Marshall Space Flight Center, 1998.

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L, Thom R., and George C. Marshall Space Flight Center., eds. Database for the tribological properties of self-lubricating materials. Marshall Space Flight Center, Ala: National Aeronautics and Space Administration, Marshall Space Flight Center, 1998.

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Zaharioudakis, Nikolaos I. An investigation of performance of aggregate mixtures by measuring their skid-resistance and coefficient of friction. [London]: Queen Mary and Westfield College, 1998.

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Miyoshi, Kazuhisa. Surface chemistry, friction, and wear properties of untreated and laser-annealed surfaces of pulsed-laser-deposited WS₂ coatings. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Miyoshi, Kazuhisa. Surface chemistry, friction, and wear properties of untreated and laser-annealed surfaces of pulsed-laser-deposited WS₂ coatings. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Book chapters on the topic "Sensitivity to the friction coefficient"

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Zhou, Junwei, Dianguang Ma, Yu Duan, and Chao Ji. "Study on Advanced Water Level Simulation Method for Inland Waterway Transport Based on the Extended Manning Formula." In Lecture Notes in Civil Engineering, 927–37. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_82.

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AbstractThe water level is a critical hydraulic parameter for inland ship safe navigation, as well as an important variable in inland waterway transport minoring and assistant systems. As a basic and traditional method, the one-dimensional (1D) hydrodynamic model is adapted to simulate river sections/waterway segments to obtain water levels numerically. However, the friction factor, i.e., Manning’s coefficient n, is a sensitive parameter for the traditional 1D hydrodynamic model. Its calibration or identification is not only very time-consuming but also unpractical. Due to its sensitivity to the simulation results, usually, one identified parameter cannot be adopted into other flow scenarios. It has been concluded that the unfitness of the traditional empirical quasi-steady friction formulae leads to these consequences/phenomena. Besides finding advanced parameter calibration algorithms and updating friction parameters dynamically, employing a true unsteady friction formula to replace the quasi-steady friction formula is a thorough solution to the problem. In this study, we introduced a newly proposed 1D unsteady friction formula to the momentum equation of the Saint-Venant Equations, thus a modified 1D hydrodynamic model was developed. To validate its capability in simulating water levels, the modified model was adopted into the Xia-la-xian – La-he-lian section of Daying River; and compared with the traditional model with the Manning formula. Results showed that the modified hydrodynamic model performs better in both water level and cross-sectional average velocity simulation. The research results can be used to support the construction of intelligent water level warning systems, intelligent shipping, and digital waterway transportation platforms.
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Blau, Peter J. "Friction Coefficient." In Encyclopedia of Tribology, 1304–6. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_169.

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Gooch, Jan W. "Friction Coefficient." In Encyclopedic Dictionary of Polymers, 327–28. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5316.

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Gooch, Jan W. "Coefficient of Friction." In Encyclopedic Dictionary of Polymers, 151. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2533.

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Man, George, and Mao-Qiang Man. "Skin Friction Coefficient." In Agache's Measuring the Skin, 203–10. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-32383-1_20.

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Shang, De-Yi, and Liang-Cai Zhong. "Skin-Friction Coefficient." In Heat and Mass Transfer, 81–90. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94403-6_7.

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Shang, De-Yi, and Liang-Cai Zhong. "Skin-Friction Coefficient." In Heat Transfer of Laminar Mixed Convection of Liquid, 129–38. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27959-6_9.

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Man, George, and Mao-Qiang Man. "Skin Friction Coefficient." In Agache’s Measuring the Skin, 1–8. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26594-0_20-1.

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Gooch, Jan W. "Coefficient of Friction, Kinetic." In Encyclopedic Dictionary of Polymers, 151. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2534.

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Gooch, Jan W. "Coefficient of Friction, Static." In Encyclopedic Dictionary of Polymers, 151. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2535.

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Conference papers on the topic "Sensitivity to the friction coefficient"

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Huang, Jinchun, Charles M. Krousgrill, and Anil K. Bajaj. "Sensitivity of Critical Value of Friction Coefficient for Brake Squeal Analysis." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35338.

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Brake squeal has been a major concern throughout the automotive industry. Structural modification is a practical and effective way to reduce brake squeal. However, few if any, systematic techniques exist to guide in this structural modification. In this work, a sensitivity analysis for brake squeal control is presented. The critical value of friction coefficient is used as a measure of squeal propensity. Based on the reduced-order characteristic equation method which can accurately estimate the critical value of friction coefficient, a sensitivity analysis of system stability with respect to lining stiffness and lining geometry is presented for a drum brake system. The sensitivity analysis can be conducted without creating new system models or performing a full complex eigenvalue analysis. Furthermore, the sensitivity analysis reveals the regions of contact area which have strong influence on squeal. It is shown that the separation of elastically coupled frequencies is influenced by the grooves in lining material, and the frequency variation can be related to the mode shapes of the drum and the shoes.
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Almulhim, Abdulraof, and Jennifer Miskimins. "Numerical Investigation of the Perforation Friction Loss and Discharge Coefficient." In SPE Hydraulic Fracturing Technology Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212329-ms.

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Abstract Among the efforts to optimize hydraulic fracturing treatments in multi-stage horizontal wells, extreme limited entry (XLE) perforating has evolved as a technique to increase the stage length and reduce the total stage count with no compromise to the well productivity. The frictional losses in such a choked fluid diversion practice is tremendous, and it is known to change dynamically due to the perforation erosion process. The orifice-based pressure drop equation, commonly used to estimate the perforation friction loss, contains a dimensionless kinetic energy correction factor, the coefficient of discharge (Cd). Cd is used to correct the ideal rate of discharge (Qi) obtained by solving Bernoulli's equation, to the actual rate (Q) due to the non-ideal effects of flow contraction and friction. Utilizing Computational Fluid Dynamics (CFD), this work modeled the flow through perforations and developed a quantitative understanding of the Cd for sharp-edge drilled and semi-round jet perforations. The study also investigated the Cd sensitivity to several design parameters such as the perforation diameter, tunnel length, and fluid viscosity. In addition to the steady state simulations, a transient erosion model with dynamic mesh capability was developed to predict the time-dependent Cd behavior due to the erosional process. The results identified a Cd value of 0.72 for a 0.35" sharp-edge drilled perforation. The discharge efficiency of actual jet and eroded perforations is higher. The model estimated a Cd ranging from 0.75 to 0.83 for a 0.35" jet perforation due to the semi-round entry and inlet burr effect. The erosion process, which dynamically changes the perforation size and shape, also improves the perforation's discharge efficiency. The transient erosion model predicted a 23% increase in the perforation size and a post-erosion Cd of 0.94. The sensitivity analysis indicated that the smaller the perforation size, the longer the tunnel, the higher the viscosity and proppant concentration, and the smaller the proppant size, the lower theCd. This numerical work provides an insight on the Cd value and its dependency on the perforation parameters, which helps to understand the wide range of values reported in the literature and reduce the uncertainty in estimating the perforation friction.
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Huang, Jinchun, Charles M. Krousgrill, and Anil K. Bajaj. "Estimation of Critical Value of Friction Coefficient for Brake Squeal Analysis." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85373.

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Automotive brake squeal which is generated during brake application has become a major concern in automotive industry. Warranty costs for brake noise have been greatly increasing in recent years. Brake noise and vibration control are important for the improvement of vehicle quietness and passenger comfort. In this work, the mode coupling instability mechanism is discussed, and a method to estimate the critical value of friction coefficient is presented to predict the onset of brake squeal. A modal expansion method is developed to calculate eigenvalue and eigenvector sensitivities. Different types of mode couplings and their relationships with squeal are discussed. A reduced-order characteristic equation method based on the statically coupled eigenvalues and their derivatives is presented to estimate the critical value of friction coefficient. The significance of this method is that the critical value of friction coefficient can be predicted accurately without the need for a full complex eigenvalue analysis, making it possible to determine the sensitivity of system stability with respect to design parameters directly.
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Deng, Haiyan, and Shreyes N. Melkote. "Parameter Effect and Sensitivity Analyses of Fixturing Dynamic Stability in Machining." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81996.

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The dynamic stability of a workpiece in a fixture is a critical indicator of machining fixture performance and is affected by a variety of factors. This paper presents a parameter effect analysis of fixturing dynamic stability in machining based on a previously developed stability model. The effects of four major factors - spindle speed, static coefficient of friction, fixture layout, and clamping forces - on the dynamic stability of a fixtured workpiece are investigated and the predominant effects are identified. Further, the effect of imprecision of the static coefficient of friction on the fixturing dynamic stability is examined. A numerical example is presented and insightful interpretations are given.
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Rizwan, Mohsin, and Panos S. Shiakolas. "Sensitivity Analysis of Micropart Motion on a Controlled Deformable Continuous Surface." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87922.

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Various approaches have been investigated for micropart (∼250 μm in size) manipulation especially for their controlled positioning for automated assembly of MEMS devices. The motion dynamics of a micropart in a dry-friction environment due to controlled deformation of a continuous flexible surface have been developed and are used to study the sensitivity of micropart motion and micropositioning as function of micropart and surface material properties and input actuator properties. The dynamics consider Van der Waal’s forces, effects of surface deformation profile, relative surface roughness, the dynamic compression of asperities and their effect on the dynamic friction coefficient based on extending Kogut-Etsion friction model through a quasi-dynamic coefficient of friction estimation. The motion of the micropart is affected by these parameters, and it is found that for some combinations of parameters a range exists that could cause motion while outside this range either there is no motion or the micropart detaches from the surface. The understanding of the effects of these parameters on micropart motion could pave the way towards controlled micropart translocation and manipulation employing a continuous flexible surface for microassembly, processes requiring controlled micropart handling for homogeneous or heterogeneous microdevice mass production, or for the development of microconveyor systems.
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Cangioli, Filippo, Paolo Pennacchi, Giacomo Riboni, Giuseppe Vannini, Lorenzo Ciuchicchi, Andrea Vania, and Steven Chatterton. "Sensitivity Analysis of the One-Control Volume Bulk-Flow Model for a 14 Teeth-on-Stator Straight-Through Labyrinth Seal." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63014.

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Since the 80s, academic research in the rotordynamics field has developed mathematical treatment for the prediction of the dynamic coefficients of sealing components. Dealing with the straight-through labyrinth seal, Iwatsubo [1], at a first stage, and Childs [2], later on, have developed the one-control volume bulk flow model. The model allows evaluating the surrounding fluid forces acting on the rotor, analyzing the fluid dynamics within the seal: the continuity, circumferential momentum and energy equations are solved for each cavity. To consider axial fluid dynamics, correlations, aiming to estimate the leakage and the pressure distribution, are required. Several correlations have been proposed in the literature for the estimation of the leakage, of the kinetic energy carry-over coefficient (KE), of the discharge coefficient and of the friction factor. After decades of research in the field of seal dynamics, the bulk-flow model has been confirmed as the most popular code in the industries, however, it is not clear which is the best set of correlations for the prediction of seal dynamic coefficients. This paper allows identifying the most accurate combination of correlations to be implemented in the bulk-flow model. The correlations are related to: the leakage formula, the flow coefficient, the KE and the friction factor. Investigating the results of several models (32 models), which consider different sets of correlations, in comparison to the experimental data (performed by General Electric Oil & Gas), it is possible to observe the dependence, of the model correlations, on the operating conditions. The experimental results, performed using a 14 teeth-on-stator labyrinth seal, investigate several operating conditions of pressure drop.
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Padhy, Sisir K. "On the Dynamics of a Rotary Compressor: Part 2 — Experimental Validation and Sensitivity Analysis." In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0309.

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Abstract This paper describes the experimental validation of the rotary compressor dynamics model [1]. Roller velocity is measured using video technology and a very good agreement is found with the theoretical results. A sensitivity study using different variables that affect the compressor dynamics is also carried out. It is found that the coefficient of friction at the vane and roller plays an important role in roller velocity. The dynamics of roller is influenced by the clearances, the roller radius, the vane radius, eccentricity of the shaft, the frictional behavior between the roller ends and the bearing plates, the discharge pressure of the compressor as well as the moment of inertia of roller.
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De Val, Nicola, Andrea Fuso, Francesco Braghin, and Edoardo Sabbioni. "Active Front Steering LTV MPC for Varying Friction Conditions." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34279.

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The developed Active Front Steering (AFS) Linear Time Variant (LTV) Model Predictive Control (MPC) is a linear model predictive control based on linearization of the nonlinear vehicle model. A sensitivity analysis of the parameters of the controller is carried out on a simple path following test. Once the optimal parameters are found, both in terms of trajectory following and real-time performances, the LTV-MPC is used for determining the requirements for the necessary sensors (in terms of minimum obstacle distance detection) as a function of the vehicle speed. Then, the same analysis is carried out considering wet road conditions (i.e. the tyre-road friction coefficient is different from that accounted for by the controller).
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Petrov, E. P. "Sensitivity Analysis of Nonlinear Forced Response for Bladed Discs With Friction Contact Interfaces." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68935.

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An effective method is proposed to calculate sensitivity of nonlinear forced response levels for bladed discs with friction contact interfaces to variation of parameters of these interfaces, including clearances and interferences. First and second order sensitivity coefficients together with ranges of high fidelity for forced response and the sensitivity coefficients prediction are determined. Numerical investigations of the sensitivity of the multiharmonic steady-state forced response of bladed discs with friction contacts and gaps have been performed showing the capabilities and efficiency of the method proposed.
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Verulkar, Adwait, Corina Sandu, Daniel Dopico, and Adrian Sandu. "Direct Sensitivity Analysis of Spatial Multibody Systems With Joint Friction Using Index-1 Formulation." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-68777.

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Abstract Sensitivity analysis is one of the most prominent gradient based optimization techniques for mechanical systems. Model sensitivities are the derivatives of the generalized coordinates defining the motion of the system in time with respect to the system design parameters. These sensitivities can be calculated using finite differences, but the accuracy and computational inefficiency of this method limits its use. Hence, the methodologies of direct and adjoint sensitivity analysis have gained prominence. Recent research has presented computationally efficient methodologies for both direct and adjoint sensitivity analysis of complex multibody dynamic systems. The contribution of this article is in the development of the mathematical framework for conducting the direct sensitivity analysis of multibody dynamic systems with joint friction using the index-1 formulation. For modeling friction in multibody systems, the Brown and McPhee friction model has been used. This model incorporates the effects of both static and dynamic friction on the model dynamics. A case study has been conducted on a spatial slider-crank mechanism to illustrate the application of this methodology to real-world systems. Using computer models, with and without joint friction, effect of friction on the dynamics and model sensitivities has been demonstrated. The sensitivities of slider velocity have been computed with respect to the design parameters of crank length, rod length, and the parameters defining the friction model. Due to the highly non-linear nature of friction, the model dynamics are more sensitive during the transition phases, where the friction coefficient changes from static to dynamic and vice versa.
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Reports on the topic "Sensitivity to the friction coefficient"

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Simpson, L. R., and M. F. Foltz. LLNL Small-Scale Friction sensitivity (BAM) Test. Office of Scientific and Technical Information (OSTI), June 1996. http://dx.doi.org/10.2172/273797.

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Van Velkinburgh, J. H. HE friction sensitivity oblique impact sensitivity of explosives (the skid test). Quarterly report, July--September 1971. Office of Scientific and Technical Information (OSTI), September 1997. http://dx.doi.org/10.2172/525019.

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Van Velkinburgh, J. H. HE friction sensitivity oblique impact sensitivity of explosives (the SKID test). Progress report, October 1971--December 1971. Office of Scientific and Technical Information (OSTI), December 1998. http://dx.doi.org/10.2172/563857.

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Akst, I. B., B. M. Washburn, and J. K. Rigdon. Oblique impact sensitivity of explosives: The skid test the snatch friction sensitivity test. Quarterly report, April--June 1964. Office of Scientific and Technical Information (OSTI), September 1997. http://dx.doi.org/10.2172/531120.

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Van Velkinburgh, J. H. HE friction sensitivity oblique impact sensitivity of explosives the skid test & half-inch gap sensitivity test. Quarterly report, April 1970--June 1970. Office of Scientific and Technical Information (OSTI), September 1997. http://dx.doi.org/10.2172/527930.

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Somers, D. M. Effects of Airfoil Thickness and Maximum Lift Coefficient on Roughness Sensitivity: 1997--1998. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/15011667.

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Barwey, Shivam. Drag Coefficient Analysis of Arbitrary Fragment Geometry with Emphasis on Meshing Sensitivity Studies. Office of Scientific and Technical Information (OSTI), December 2019. http://dx.doi.org/10.2172/1592927.

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Dumas, Alexis, André Bégin-Drolet, and Julien Lépine. Development of a ski testing machine based on the effective friction coefficient for classic cross-country skis. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317548.

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Wei, Fulu, Ce Wang, Xiangxi Tian, Shuo Li, and Jie Shan. Investigation of Durability and Performance of High Friction Surface Treatment. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317281.

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The Indiana Department of Transportation (INDOT) completed a total of 25 high friction surface treatment (HFST) projects across the state in 2018. This research study attempted to investigate the durability and performance of HFST in terms of its HFST-pavement system integrity and surface friction performance. Laboratory tests were conducted to determine the physical and mechanical properties of epoxy-bauxite mortar. Field inspections were carried out to identify site conditions and common early HFST distresses. Cyclic loading test and finite element method (FEM) analysis were performed to evaluate the bonding strength between HFST and existing pavement, in particular chip seal with different pretreatments such as vacuum sweeping, shotblasting, and scarification milling. Both surface friction and texture tests were undertaken periodically (generally once every 6 months) to evaluate the surface friction performance of HFST. Crash records over a 5-year period, i.e., 3 years before installation and 2 years after installation, were examined to determine the safety performance of HFST, crash modification factor (CMF) in particular. It was found that HFST epoxy-bauxite mortar has a coefficient of thermal expansion (CTE) significantly higher than those of hot mix asphalt (HMA) mixtures and Portland cement concrete (PCC), and good cracking resistance. The most common early HFST distresses in Indiana are reflective cracking, surface wrinkling, aggregate loss, and delamination. Vacuum sweeping is the optimal method for pretreating existing pavements, chip seal in particular. Chip seal in good condition is structurally capable of providing a sound base for HFST. On two-lane highway curves, HFST is capable of reducing the total vehicle crash by 30%, injury crash by 50%, and wet weather crash by 44%, and providing a CMF of 0.584 in Indiana. Great variability may arise in the results of friction tests on horizontal curves by the use of locked wheel skid tester (LWST) due both to the nature of vehicle dynamics and to the operation of test vehicle. Texture testing, however, is capable of providing continuous texture measurements that can be used to calculate a texture height parameter, i.e., mean profile depth (MPD), not only for evaluating friction performance but also implementing quality control (QC) and quality assurance (QA) plans for HFST.
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Cao Romero, Julio A., Jorge Reyes-Avendaño, Julio Soriano, Leonardo Farfan-Cabrera, and Ali Erdemir. A Pin-on-Disc Study on the Electrified Sliding Wear of EVs Powertrain Gears. SAE International, March 2022. http://dx.doi.org/10.4271/2022-01-0320.

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In contrast to conventional powertrains from internal combustion engine vehicles (ICEV), the tribological performance of powertrains of electric vehicles (EVs) must be further evaluated by considering new critical operating conditions such as electrical environments. The operation of any type of electric motor produces shaft voltages and currents due to various hardware configurations and factors. Furthermore, the common application of inverters intensifies this problem. It has been reported that the induced shaft voltages and currents can cause premature failure problems in tribological components such as bearings and gears due to accelerated wear and/or fatigue. It is ascribed to effects of electric discharge machining (EDM), also named, sparking wear caused by shaft currents and poor or increasingly diminishing dielectric strength of lubricants. A great effort has been done to study this problem in bearings, but it has not yet been the case for gears. Considering that EVs powertrains can be configurated with an electric motor coupled to a single-speed or multi-speed transmission, it is expected that shaft currents can also affect gears to some extent. The pin-on-disc test has been widely used to study sliding wear of gear materials under comparable or realistic operating conditions. This accelerated test is effective for screening materials, lubricants and operating conditions allowing evaluations of their friction and wear properties. However, it has not been implemented for studying gear materials under electrified environments. Thus, this paper aims to explore the friction coefficient and wear of gear materials under non-electrified and electrified sliding in a pin-on-disc tester applying typical of EVs powertrain shaft currents during sliding. The tests were carried out at two different DC currents under comparable gear dry and lubricated sliding contact conditions. Friction coefficient, wear volumes and morphologies were evaluated and reported in this work.
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