Relevant bibliographies by topics / Pressure-based friction

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Pressure-based friction'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Pressure-based friction"

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Ozaki, Shingo, Takeru Matsuura, and Satoru Maegawa. "Rate-, state-, and pressure-dependent friction model based on the elastoplastic theory." Friction 8, no. 4 (January 4, 2020): 768–83. http://dx.doi.org/10.1007/s40544-019-0321-3.

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AbstractAdhesion is one of essences with respect to rubber friction because the magnitude of the friction force is closely related to the magnitude of adhesion on a real contact area. However, the real contact area during sliding depends on the state and history of the contact surface. Therefore, the friction force occasionally exhibits rate-, state-, and pressure dependency. In this study, to rationally describe friction and simulate boundary value problems, a rate-, state-, and pressure-dependent friction model based on the elastoplastic theory was formulated. First, the evolution law for the friction coefficient was prescribed. Next, a nonlinear sliding surface (frictional criterion) was adopted, and several other evolution laws for internal state variables were prescribed. Subsequently, the typical response characteristics of the proposed friction model were demonstrated, and its validity was verified by comparing the obtained results with those of experiments conducted considering the contact surface between a rough rubber hemisphere and smooth acrylic plate.
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Cramer, David D., and Junjing Zhang. "Pressure-Based Diagnostics for Evaluating Treatment Confinement." SPE Production & Operations 36, no. 03 (January 18, 2021): 530–52. http://dx.doi.org/10.2118/205003-pa.

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Summary In multiple-stage hydraulic fracturing treatments performed in horizontal wells, treatment confinement is the state in which fracturing fluid and proppant flow out of the wellbore only through the specific perforations targeted for the fracturing stage. The terms treatment confinement and treatment isolation are synonymous. Isolation from previously treated intervals is a necessary condition for efficient treatment along the lateral. Failure to confine fracturing stages can be a result of failure of the fracture plug to maintain a seal or the development of casing breaches (holes) in the proximity of the fracture plug. Both conditions can be strongly impacted by proppant induced erosion. This paper is a sequel to a previous publication in which casing erosion and breaches were investigated in fracture treated horizontal wells in the Montney Formation (White et al. 2020). Integrated diagnostic methods based on data from treating pressure analysis, fiber-optic measurements, and downhole imaging were applied to investigate the root cause of failure. It was determined that treatment pressure analysis was effective in diagnosing casing and associated fracture plug integrity-loss events. This was achieved by (1) identifying treating pressure trends and anomalies during the main part of the treatment that signify confinement loss, (2) calculating near-wellbore friction at the end of treatments to compare to the friction expected for a confined treatment, and (3) analyzing step-down tests conducted during the pad stage and overflush stage at the end of the treatment to determine the near-wellbore frictional components of perforation friction and near-wellbore tortuosity. This information enables comparison of previous with current treatments for determining the effects of job design and fracture plug modifications on treatment confinement. The objective of this paper is to validate that useful conclusions on the degree of treatment confinement can be made using only stand-alone pressure-based analysis. This is achieved by comparing the analysis results with fiber-optic and post-treatment wellbore imaging measurements. Also highlighted is the use of downhole gauges for accurately calculating pipe friction, which is necessary for accurately calculating bottomhole treating pressure at the active treatment interval.
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Ates, Hakan, Mehmet Turker, and Adem Kurt. "Effect of friction pressure on the properties of friction welded MA956 iron-based superalloy." Materials & Design 28, no. 3 (January 2007): 948–53. http://dx.doi.org/10.1016/j.matdes.2005.09.015.

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Hattori, Yasuhisa, and Yusuke Kato. "Dynamic Friction Behavior of Paper-Based Wet Friction Material Subjected to Contact Pressure Fluctuation." Tribology Online 7, no. 3 (2012): 184–89. http://dx.doi.org/10.2474/trol.7.184.

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Fu, Rong, Fei Gao, and Bao Yun Song. "Study on Friction Properties of Cu-Fe-Based Powder Metallurgy Materials under Dry and Wet Friction Conditions." Advanced Materials Research 150-151 (October 2010): 1806–9. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.1806.

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Copper-iron-based friction materials were prepared by powder metallurgy process. The effects of friction velocity and friction pressure on friction and wear behavior of the material under dry and wet friction conditions were investigated with a constant-speed friction machine. The results show that, at low speed friction, the dry friction coefficient is higher than wet friction coefficient and the friction coefficient increases with increasing friction pressure. The reason is that the water film plays an important role in cleaning and lubricating. At high speed friction, there is not much difference between dry and wet friction coefficients and the friction coefficient is not sensitive to friction pressure changes. This is due to the metal matrix high-temperature softening, caused by high speed friction, which controls the friction properties.
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Zhang, Yao, and Wan Ling Zhang. "Research Pressure Loss Based on Gas Liquid Two Phrase Flow Experiment System." Applied Mechanics and Materials 404 (September 2013): 302–6. http://dx.doi.org/10.4028/www.scientific.net/amm.404.302.

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This paper discussed the pressure drop about the friction pressure drop and gravity pressure drop in the pipe. Represent the model of pressure drop. Calculate the pressure drop in the experiment system. Flow pattern and pressure drop has the directly relationship. And the friction pressure drop is the main factor of influences internal fluid mechanism. Pressure drop is basic of research the water rate and dynamics fluid.
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Man, Jiaxiang, Jiyun Zhao, Liangchen Song, and Haifeng Yang. "Study the Influence of Surface Morphology and Lubrication Pressure on Tribological Behavior of 316L–PTFE Friction Interface in High-Water-Based Fluid." Coatings 10, no. 4 (April 19, 2020): 405. http://dx.doi.org/10.3390/coatings10040405.

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Because of the low viscosity of high-water-based fluids, the intense wear and leakage of key friction pairs represent a bottleneck to the wide application of the high-water-based hydraulic motor in engineering machinery. In this work, based on the common characteristics of plane friction pairs, the friction experiments of a 316L stainless steel (316L)–polytetrafluoroethylene (PTFE) friction pair under various working condition were carried out by a self-designed friction experimental system with fluid lubrication. The influence of lubrication pressure and surface morphology on the 316L–PTFE friction pair was investigated both experimentally and theoretically. The experimental and numerical results indicated that increasing lubrication pressure reduced the surface wear of PTFE sample, but the leakage of 316L–PTFE friction pair also increased. It could not form an effective fluid lubrication film in the 316L–PTFE friction pair under low lubrication pressure, which caused the severe wear in friction pair interface. The smooth 316L surface could be conducive to the formation of high-water-based fluid lubrication film in 316L–PTFE friction interface. The pressure distribution of high-water-based fluid lubrication film in 316L–PTFE friction pair was also obtained in fluent. The PTFE surface was easily worn when the lubrication film in the friction pair was too thin or uneven. The friction and wear were obviously improved when the normal load was balanced by the bearing capacity of the high-water-based fluid lubrication film.
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Day, A. J. "An Analysis of Speed, Temperature, and Performance Characteristics of Automotive Drum Brakes." Journal of Tribology 110, no. 2 (April 1, 1988): 298–303. http://dx.doi.org/10.1115/1.3261604.

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Finite element analysis techniques have been used to simulate braking friction in a large, heavy duty twin leading shoe brake. Temperature, lining wear and pressure distributions, and thermal distortions of the brake drum which are generated during high pressure brake applications from two different road speeds have been predicted and compared with experimental data. Two different types of brake lining, a conventional asbestos-based resin-bonded composite friction material and a heavy duty resin-bonded semi-metallic type of friction material have been studied in this way, and it is shown that observed in-stop and speed-related brake performance are strongly dependent upon the rate of frictional energy transformation at the lining/drum interface, which defines the development of interface transient temperatures. By relating the measured friction characteristic of the friction material to predicted lining friction surface temperatures good correlation between predicted and actual brake performance is demonstrated.
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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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Serafińska, Aleksandra, Wolfgang Graf, and Michael Kaliske. "Artificial Neural Networks Based Friction Law for Elastomeric Materials Applied in Finite Element Sliding Contact Simulations." Complexity 2018 (November 19, 2018): 1–15. http://dx.doi.org/10.1155/2018/4396758.

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A realistic characterization of the frictional behaviour of materials and mechanical systems is of prime importance for the assessment of their contact interaction properties, especially in the context of undesired temperature rise or intensive wear leading to service life reduction. A characteristic tribological property of elastomeric materials is the dependency of the friction coefficient on the local contact pressure, sliding velocity, and temperature in the contact interface. Thus, the friction coefficient is not constant in the entire contact area but varies according to the magnitudes of the aforementioned three influencing factors. In this contribution, a friction law based on artificial neural networks (ANN) is presented, which is able to capture the nonlinear dependencies of the friction coefficient on the contact pressure, sliding velocity, and temperature. Due to an extraordinary adaptivity of the ANN structure, these nonlinear relations stemming from experimental data can be modelled properly within the introduced friction law, in contrast to other friction formulations, which are limited by the fitting quality of their parameters. The ANN based friction law is implemented into a contact formulation of the finite element method (FEM). Especially, the linearization of contact contributions to the weak form of momentum balance equation, required for the FEM, is developed taking into account the differentiability of the ANN. The applicability of the developed friction law within the finite element analysis of tires as well as within sliding simulations of rubber elements is presented in this paper.
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Dissertations / Theses on the topic "Pressure-based friction"

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Güttler, Andreas [Verfasser]. "High accuracy determination of skin friction differences in an air channel flow based on pressure drop measurements / Andreas Güttler." Karlsruhe : KIT Scientific Publishing, 2017. http://www.ksp.kit.edu.

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Güttler, Andreas [Verfasser], and B. [Akademischer Betreuer] Frohnapfel. "High accuracy determination of skin friction differences in an air channel flow based on pressure drop measurements / Andreas Güttler. Betreuer: B. Frohnapfel." Karlsruhe : KIT-Bibliothek, 2015. http://d-nb.info/107320491X/34.

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Stucki, Chad Lamar. "Aerodynamic Design Optimization of a Locomotive Nose Fairing for Reducing Drag." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7478.

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Rising fuel cost has motivated increased fuel efficiency for freight trains. At cruising speed,the largest contributing factor to the fuel consumption is aerodynamic drag. As a result of stagnationand flow separation on and around lead and trailing cars, the first and last railcars experiencegreater drag than intermediate cars. Accordingly, this work focused on reducing drag on lead locomotivesby designing and optimizing an add-on nose fairing that is feasible for industrial operation.The fairing shape design was performed via computational fluid dynamic (CFD) software.The simulations consisted of two in-line freight locomotives, a stretch of rails on a raised subgrade,a computational domain, and a unique fairing geometry that was attached to the lead locomotive ineach non-baseline case. Relative motion was simulated by fixing the train and translating the rails,subgrade, and ground at a constant velocity. An equivalent uniform inlet velocity was applied atzero degree yaw to simulate relative motion between the air and the train.Five fairing families-Fairing Families A-E (FFA-FFE)-are presented in this thesis.Multidimensional regressions are created for each family to approximate drag as a function ofthe design variables. Thus, railroad companies may choose an alternative fairing if the recommendedfairing does not meet their needs and still have a performance estimate. The regression forFFE is used as a surrogate model in a surrogate based optimization. Results from a wind tunneltest and from CFD are reported on an FFE geometry to validate the CFD model. The wind tunneltest predicts a nominal drag reduction of 16%, and the CFD model predicts a reduction of 17%.A qualitative analysis is performed on the simulations containing the baseline locomotive, the optimalfairings from FFA-FFC, and the hybrid child and parent geometries from FFA & FFC. Theanalysis reveals that optimal performance is achieved for a narrow geometry from FFC becausesuction behind the fairing is greatly reduced. Similarly, the analysis reveals that concave geometriesboost the flow over the top leading edge of the locomotive, thus eliminating a vortex upstreamof the windshields. As a result, concave geometries yield greater reductions in drag.The design variable definitions for each family were strategically selected to improve manufacturability,operational safety, and aerodynamic performance relative to the previous families.As a result, the optimal geometry from FFE is believed to most completely satisfy the constraintsof the design problem and should be given the most consideration for application in the railroadindustry. The CFD solution for this particular geometry suggests a nominal drag reduction of 17%on the lead locomotive in an industrial freight train.
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Yung, I. "Automation of front-end loaders : electronic self leveling and payload estimation." Doctoral thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-134338.

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A growing population is driving automatization in agricultural industry to strive for more productive arable land. Being part of this process, this work is aimed to investigate the possibility to implement sensor-based automation in a particular system called Front End Loader, which is a lifting arms that is commonly mounted on the front of a tractor. Two main tasks are considered here, namely Electronic Self Leveling (ESL) and payload estimation. To propose commercially implementable solutions for these tasks, specific objectives are set, which are: 1) to propose a controller to perform ESL under typical disturbances 2) to propose a methodology for payload estimation considering realistic estimation conditions. Lastly, aligned with these goals, 3) to propose models for the Front End Loader under consideration for derivation of solutions of the specified tasks. The self-leveling task assists farmers in maintaining the angular position of the mounted implements, e.g. a bale handler or a bucket, with respect to the ground when the loader is manually lifted or lowered. Experimental results show that different controllers are required in lifting and lowering motions to maintain the implement's angular position with a required accuracy due to principle differences in gravity impact. The gravity helps the necessary correction in lifting motion, but works against the correction in lowering motions. This led us to propose a controller with a proportional term, a discontinuous term and an on-line disturbance estimation and compensation as well as the tuning procedure to achieve a 2 degrees tracking error for lowering motions in steady state. The proposed controller shows less sensitive performance to lowering velocity, as the main disturbance, in comparison to a linear controller. The second task, payload estimation, assists farmers to work within safety range as well as to work with a weight measurement tool. A mechanical model derived based on equations of motion is improved by a pressure based friction to sufficiently accurately represent the motion of the front end loader under consideration. The proposed model satisfies the desired estimation accuracy of 2\% full scale error in a certain estimation condition domain in constant velocity regions, with off-line calibration step and off-line payload estimation step. An on-line version of the estimation based on Recursive Least Squares also fulfills the desired accuracy, while keeping the calibration step off-line.
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Loizou, Andreas. "Modelling and simulation of themo-mechanical phenomena at the friction interface of a disc brake.An empirically-based finite element model for the fundamental investigation of factors that influence the interface thermal resistance at the friction interface of a high energy sliding pair in a disc brake." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5489.

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The fundamental theories of heat generation and transfer at the friction interface of a brake assume either matching or not matching surface temperatures by having a varying or uniform heat partition ratio respectively. In the research presented the behaviour of heat partition has been investigated in a fundamental study based on experimental measurements of temperature and the associated modelling and simulation of heat transfer in a brake friction pair. For a disc brake, an important parameter that was identified from the literature study is the interface tribo-layer (ITL), which has been modelled as an equivalent thermal resistance value based on its thickness and thermal conductivity. The interface real contact area was also an important parameter in this investigation, and it has been found to affect heat partitioning by adding its own thermal resistance. A 2-dimensional (2D) coupled-temperature displacement Finite Element (FE) model is presented, based on which a novel relationship which characterises the total thermal resistance (or conductance) at the friction interface has been characterised based on the ITL thermal properties, the contact area, and the contact pressure at the interface. Using the model the effect of friction material wear on the total thermal resistance (or conductance) at the friction interface was predicted and a comparison of the Archard and Arrhenius wear laws in predicting the wear of a resin bonded composite friction material operating against a cast iron mating surface is presented. A 3-dimensional (3D) model is also presented. This model has represented a small scale disc brake test rig which has been used in parallel with the simulation for validation in a drag braking scenario. Two simulation conditions with different pad surface states were investigated, the first having a nominally flat surface, and the second an adjusted (worn) pad surface based on bedding-in data. The Arrhenius wear model was applied to significance of including wear on the total thermal resistance at the friction interface over a short brake application. A sensitivity analysis on the interface thermal conductance, the location of heat generation, and the magnitude of contact pressure has identified the importance of each factor in determining the total thermal resistance (or conductance) at the friction interface during any friction brake application. It is concluded that the heat partitioning is insensitive on the location of heat generation, and that the most sensitive parameter is the contact pressure.
Institution of Mechanical Engineers (IMechE)
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Loizou, Andreas. "Modelling and simulation of themo-mechanical phenomena at the friction interface of a disc brake : an empirically-based finite element model for the fundamental investigation of factors that influence the interface thermal resistance at the friction interface of a high energy sliding pair in a disc brake." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5489.

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The fundamental theories of heat generation and transfer at the friction interface of a brake assume either matching or not matching surface temperatures by having a varying or uniform heat partition ratio respectively. In the research presented the behaviour of heat partition has been investigated in a fundamental study based on experimental measurements of temperature and the associated modelling and simulation of heat transfer in a brake friction pair. For a disc brake, an important parameter that was identified from the literature study is the interface tribo-layer (ITL), which has been modelled as an equivalent thermal resistance value based on its thickness and thermal conductivity. The interface real contact area was also an important parameter in this investigation, and it has been found to affect heat partitioning by adding its own thermal resistance. A 2-dimensional (2D) coupled-temperature displacement Finite Element (FE) model is presented, based on which a novel relationship which characterises the total thermal resistance (or conductance) at the friction interface has been characterised based on the ITL thermal properties, the contact area, and the contact pressure at the interface. Using the model the effect of friction material wear on the total thermal resistance (or conductance) at the friction interface was predicted and a comparison of the Archard and Arrhenius wear laws in predicting the wear of a resin bonded composite friction material operating against a cast iron mating surface is presented. A 3-dimensional (3D) model is also presented. This model has represented a small scale disc brake test rig which has been used in parallel with the simulation for validation in a drag braking scenario. Two simulation conditions with different pad surface states were investigated, the first having a nominally flat surface, and the second an adjusted (worn) pad surface based on bedding-in data. The Arrhenius wear model was applied to significance of including wear on the total thermal resistance at the friction interface over a short brake application. A sensitivity analysis on the interface thermal conductance, the location of heat generation, and the magnitude of contact pressure has identified the importance of each factor in determining the total thermal resistance (or conductance) at the friction interface during any friction brake application. It is concluded that the heat partitioning is insensitive on the location of heat generation, and that the most sensitive parameter is the contact pressure.
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Hong-RuZeng and 曾鴻儒. "Effects of Post-Curing Temperature and Pressure on Mechanical and Tribological Properties of the Rubber Based Friction Material." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/68262791397677884437.

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Yu, Tingmin. "The tractive performance of a friction-based prototype track." Thesis, 2006. http://hdl.handle.net/2263/28843.

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In recent years, the interest in the design, construction and utilization of rubber tracks for agriculture and earth moving machinery has increased considerably. The development of such types of tracks was initiated by the efforts to invent a more environmentally friendly vehicle-terrain system. These tracks are also the result of the continuous effort to develop more cost-effective traction systems. A rubber-surfaced and friction-based prototype track was developed and mounted on the patented modification of a new Allis Chalmers four wheel drive tractor. The track is propelled by smooth pneumatic tyres by means of rubber-rubber friction and the tractive effort of the track is mainly generated by soil-rubber friction between the rubber surface of the track elements and terrain. The experimental track layer tractor, based on an Allis Chalmers 8070 tractor (141 kW) was tested on concrete and on cultivated sandy loam soil at 7.8%; 13% and 21% soil water content. The contact pressure and the tangential force on an instrumented track element, as well as the total torque input to one track, was simultaneously recorded during the drawbar pull-slip tests. Soil characteristics for pressure-sinkage and friction-displacement were obtained from the field tests by using an instrumented linear shear and soil sinkage device. By applying the approach based on the classical bevameter technique, analytical methods were implemented for modelling the traction performance of the prototype track system. Different possible pressure distribution profiles under the tracks were considered and compared to the recorded data. Two possible traction models were proposed, one constant pressure model, for minimal inward track deflection and the other a flexible track model with inward deflection and a higher contact pressure at both the front free-wheeling and rear driving tyres. For both models, the traction force was mainly generated by rubber-soil friction and adhesion with limited influence by soil shear. For individual track elements, close agreement between the measured and predicted contact pressure and traction force was observed based on the flexible track model. The recorded and calculated values of the coefficient of traction based on the summation of the traction force for the series of track elements were comparable to the values predicted from modelling. However, the measured values of drawbar pull coefficient were considerably lower than the predicted values, largely caused by internal track friction in addition to energy dissipated by soil compaction. The tractive efficiency for soft surface was also unacceptably low, probably due to the high internal track friction and the low travel speeds applied for the tests. The research undertaken identified and confirmed a model to be used to predict contact pressure and tangential stresses for a single track element. It was capable of predicting the tractive performance for different possible contact pressure values.
Thesis (PhD (Argricultural Engineering))--University of Pretoria, 2007.
Civil Engineering
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Book chapters on the topic "Pressure-based friction"

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Wang, Changlu, Long Wu, Zichun Xu, Yaping Zhang, Hao Gao, and Yanzhong Wang. "Research on Contact Pressure of Friction Pair Based on Finite Element Method." In Structural Integrity, 135–41. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-21894-2_26.

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Ding, Nenggen, and Xiaofei Zhan. "Model-Based Recursive Least Square Algorithm for Estimation of Brake Pressure and Road Friction." In Lecture Notes in Electrical Engineering, 137–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33795-6_12.

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Zahedi, Sanam, Jillian M. McLaughlin, and Linda G. Phillips. "Gluteal Flap for Pressure Sores." In Operative Plastic Surgery, edited by Gregory R. D. Evans, 747–52. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780190499075.003.0070.

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Pressure sores usually occur over bony prominences. Based on the distribution of pressure, sacral pressure sores are more common in supine patients, and ischial pressure sores are more common in sitting patients. Patients in acute care settings, in nursing homes, or with spinal cord injuries are among the most commonly affected populations. Pressure sores are a recurrent problem with multiple risk factors including direct pressure, friction, shearing forces, immobility, and moisture. Malnutrition, anemia, and chronic illness can also contribute to their formation by the impairment of blood supply and delayed wound healing. This chapter reviews the operative technique for using different types of gluteal flaps as coverage for sacral pressure sores. It highlights essential components of preoperative, operative, and postoperative decision-making and common postoperative complications encountered.
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Zang, Jinguang, Xiao Yan, and Yanping Huang. "The Basic Thermal Hydraulic Issues of Applying Supercritical Fluid to Nuclear Reactors." In Handbook of Research on Advancements in Supercritical Fluids Applications for Sustainable Energy Systems, 682–716. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-5796-9.ch019.

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This chapter is mainly focused on illustrating some introductory progress on thermal hydraulic issues of supercritical water, including heat transfer characteristics, pressure loss characteristics, flow stability issues, and numerical method. These works are mainly to give a basic idea of elementary but important topics in this area. An analytical method was proposed up to predict the heat transfer coefficient and friction coefficient based on the two-layer wall function. Flow instability experiments have been carried out in a two-parallel-channel system with supercritical water, aiming to provide an up-to-date knowledge of supercritical flow instability phenomena and initial validation data for numerical analysis. The natural circulation instability of supercritical water was also investigated in the experiments.
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Furbish, David Jon. "Viscous Flows." In Fluid Physics in Geology. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195077018.003.0016.

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Most flow problems in geology involve viscous fluids which exhibit resistance to shearing motions. Mechanical treatments of such flows therefore must involve a consideration of frictional forces associated with this viscous behavior. Our first objective is to obtain a general equation of motion based on Newton’s second law that involves body and surface forces acting on a fluid element, regardless of the specific fluid involved. The steps in this development are similar to those leading to Euler’s equation for inviscid flows (Chapter 10); the difference is that tangential stresses acting on a fluid element, in addition to normal stresses, are included in the description of surface forces. It will be necessary, when describing normal forces, to distinguish between the thermodynamic pressure p, as used in treating inviscid flows, and a mechanical pressure σ0, which arises in treating viscous effects associated with compressible flows, and flows that simultaneously involve chemical reactions and possibly other phenomena. The second step in obtaining an equation of motion is determined by the specific fluid involved. Here we require a supplemental set of equations that describe the relation between surface forces and rates of fluid strain, as defined by the rate-of-strain tensor examined in Chapter 11. This set of equations, referred to as the constitutive equations of a fluid, varies with fluid rheology. The emphasis of this chapter is on Newtonian fluids. The set of constitutive equations in this case, when coupled with the general equation of motion obtained in the first step, lead to the well known Navier-Stokes equations. In addition, we will briefly examine the case of glacier ice as an example of a non-Newtonian fluid whose rheology is described by Glen’s law (Chapter 3). Treatments of viscous flows that incorporate conservation of energy similarly must involve a consideration of work performed against the frictional effects of viscosity. This performance of work against friction is nonconservative. Its effect therefore is to continuously extract mechanical energy from the main fluid motion, dissipating it in the form of heat. Our treatment of this irreversible conversion of energy will lead to a dissipation function that is added to the energy equation developed in Chapter 9.
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Yan, Xiao, Jinguang Zang, Ting Xiong, Xi Sui, Yanping Huang, and Zejun Xiao. "The Basic Thermal Hydraulic Issues of Applying Supercritical Fluid to Nuclear Reactors." In Advanced Applications of Supercritical Fluids in Energy Systems, 481–553. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2047-4.ch015.

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This chapter is mainly focused on illustrating some introductory progress on thermal hydraulic issues of supercritical water, including heat transfer characteristics, pressure loss characteristics, flow stability issues and numerical method. These works are mainly performed in Nuclear Power Institute of China (NPIC) these years, to give a basic idea of elementary but important topics in this area. An analytical method was proposed up to predict the heat transfer coefficient and friction coefficient based on the two-layer wall function. Flow instability experiments have been carried out in a two-parallel-channel system with supercritical water, aiming to provide an up-to-date knowledge of supercritical flow instability phenomena and initial validation data for numerical analysis. An in-house code has been developed in NPIC in order to better utilize and further expand the experimental results on supercritical flow instability. At last, some future research directions are suggested for reference.
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Da Silva Lima, Ricardo J., and John R. Thome. "Flow Pattern-Based Boiling Heat Transfer and Frictional Pressure Drop Models for Plain Horizontal Tubes." In Encyclopedia of Two-Phase Heat Transfer and Flow II, 355–94. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814623285_0016.

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Conference papers on the topic "Pressure-based friction"

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Pandey, Vibhas J. "Friction Pressure Correlation for Guar-Based Hydraulic Fracturing Fluids." In SPE Rocky Mountain Petroleum Technology Conference. Society of Petroleum Engineers, 2001. http://dx.doi.org/10.2118/71074-ms.

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2

Kontz, M. E., W. J. Book, and J. G. Frankel. "Pressure Based Exogenous Force Estimation." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14441.

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Using pressure transducers to estimate the exogenous force acting on an end effector could be useful for a number of applications. These might include load estimation or diagnostics. In this case, it is motivated by haptic control of backhoes/excavators. Using pressure transducers is attractive from a cost point of view because they are relatively inexpensive and more importantly already present on many electro-hydraulic systems. Measuring the cylinder pressure and multiplying by the respective areas give the total force on each cylinder that is produced by the hydraulic pressure. Embedded in this force is cylinder and structural friction, gravitational forces, inertial/Coriolis/centrifugal forces and exogenous forces acting on the end effector. Particularly challenging is the friction inside the cylinders which is not only velocity dependent, but also pressure dependent. The friction increases as the pressure inside the cylinders push harder on the seal. This paper discusses how to remove the unwanted force components which result in an estimation of the exogenous force on the end effector. Experimental results are presented from a backhoe test-bed and the new method is compared with previous work related to this topic.
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3

Ahmed Kamel, Ahmed Hosny, and Subhash Nandlal Shah. "Friction Pressure Losses of Surfactant-Based Fluids Flowing in Coiled Tubing." In SPE Production and Operations Conference and Exhibition. Society of Petroleum Engineers, 2010. http://dx.doi.org/10.2118/135826-ms.

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4

Chen, Fei, Xiao-ming Chi, and Zhi-ming Jing. "Research on Friction Pressure Prediction of hydraulic fracturing Based on RBF Neural Network." In 2021 6th International Conference on Intelligent Computing and Signal Processing (ICSP). IEEE, 2021. http://dx.doi.org/10.1109/icsp51882.2021.9408783.

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5

Wan, Zhishuai, Xiandong Liu, Haixia Wang, Yingchun Shan, and Tian He. "Friction Coefficient Model of Friction Pair Composed of Automotive Brake Materials." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37407.

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The friction experiments are conducted on a pin-on-disc friction material testing machine. The sliding velocity, pressure, temperature and friction coefficient are measured. The effects of brake temperature, brake pressure and braking speed on the friction coefficient are examined. Based on energy conservation theory, the model of friction coefficient is established using statistical methods. Then a semi-empirical model of friction coefficient is established by regression analysis methods. And the effects of the temperature, brake pressure, the relative sliding velocity and these cross-terms on the friction coefficient are also discussed.
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6

McElfresh, P. M., W. R. Wood, C. F. Williams, S. N. Shah, N. Goel, and Y. Zhou. "A Study of the Friction Pressure and Proppant Transport Behavior of Surfactant-Based Gels." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2002. http://dx.doi.org/10.2118/77603-ms.

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7

Ghaedi, Parisa, Mahmoud Khalifeh, Arild Saasen, Helge Hodne, Tor H. Omland, and Farzad Shoghl. "Mechanical Friction in Well Construction and Laboratory Testing of Friction Coefficients." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96594.

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Abstract A new device for measuring the lubricity of drilling fluids for controlling the mechanical friction is developed. This is able to measure mechanical friction at temperatures between room temperature and 200°C and at pressures in the range of atmospheric to 20 000 psi. The effects of lubricants on mechanical friction is outlined. Different types of available test instruments are reviewed. These instruments include both commercial equipment and special designed equipment. In addition, the effect of pressure and temperature as well as their combined effect on the friction coefficient of deionized water, mineral oil and oil-based mud (OBM) have been investigated as initial test of the developed instrument. Our initial results show that friction coefficient increases with pressure increase for the mineral oil and OBM, at 25°C. However, when deionized water was used as lubricant, the friction coefficient decreased when pressure was increased.
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8

Lyon, Scott M., and Mark S. Evans. "Modeling and Pressure-Based Force Control of a Hydraulic Actuator." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/cie-4466.

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Abstract A dynamic model of a hydraulic actuator/spool valve combination is developed using the bond graph method. Feedback linearization is used to develop a force controller for the system using hydraulic pressure in each chamber of the actuator along with piston position and velocity as feedback. The use of a feedforward term to compensate for the seal friction within the actuator provides for a stable and accurate controller. Velocity control is achieved through calculation of the reference force required to overcome the seal friction and produce the acceleration required to reach the desired velocity. It is shown that the use of such a force controller allows for an acceptable transition from velocity to force control when the piston comes in contact with an external surface.
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9

Ogugbue, Chinenye C., and Subhash N. Shah. "Friction Pressure Correlations for Oilfield Polymeric Solutions in Eccentric Annulus." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-80044.

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Polymer fluids are utilized extensively in the petroleum industry for viscosity enhancement and friction pressure reduction during turbulent flow. Selection of the appropriate correlation for the desired fluid and flow regime is very important for the accurate determination of frictional pressure losses. A range of correlations has been published for predicting frictional losses under annular flow conditions. All these correlations are based on certain assumptions, which limit their application under different operating conditions. This paper presents the results of an experimental study carried out to develop a reliable frictional pressure loss correlation for polymeric solutions in a fully eccentric annulus. Fluids investigated include Water, Guar, Xanthan, and Welan gum under conditions typically encountered in drilling and completion operations. The frictional pressure losses of these polymeric fluids exhibiting drag-reducing characteristics are investigated and analyzed as a function of generalized Reynolds number for each fluid. The experimental set-up includes 200 ft of 1 1/2-in. straight tubing, and 200 ft of (3 1/2-in. × 1 3/4-in.) fully eccentric annuli. Data analysis enabled the development of an improved correlation for polymer solutions in a fully eccentric annulus. Fluids apparent viscosity at 511 sec−1, generalized Reynolds number, and diameter ratio, all of which can be easily determined in the field, were selected as independent variables for the new correlation. Experimental data show that the new correlation estimates friction pressure losses in fully eccentric annuli much better than previously published equations.
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10

Aksit, Mahmut F. "Analysis of Brush Seal Bristle Stresses With Pressure-Friction Coupling." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38718.

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With their superior leakage performance brush seals are used in many demanding sealing applications. In recent years, they found ever increasing use in ground based large industrial gas and steam turbines replacing labyrinth seals. As the applications become more demanding, seal designs are pushed to their limits. The knowledge of brush seal bristle stresses is essential to determine seal pressure carrying capability and amount of creep for high temperature applications. Seal manufacturers continue to rely on their experience and simple models based on beam theory in order to develop the required robust seal designs. Although some analytical formulations are developed over the years, pressure-stiffness coupling and its effects on bristle stresses deserve further study due to complicated frictional bristle interactions. In order to explore brush seal bristle stresses with frictional effects, this paper presents a study using a 3-D finite element analysis. A maximum bristle stress relation is derived based on statistically designed experiments. Model accuracy is determined through verification simulations. A discussion on the effects of design and loading parameters on maximum stress is also included.
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