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Journal articles on the topic 'Directional friction'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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1

Tiwari, A., L. Dorogin, B. Steenwyk, et al. "Rubber friction directional asymmetry." EPL (Europhysics Letters) 116, no. 6 (2016): 66002. http://dx.doi.org/10.1209/0295-5075/116/66002.

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2

Stosiak, Michał, Mykola Karpenko, Adam Deptuła, et al. "Modelling and Experimental Verification of the Interaction in a Hydraulic Directional Control Valve Spool Pair." Applied Sciences 13, no. 1 (2022): 458. http://dx.doi.org/10.3390/app13010458.

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This study examined the impact of mechanical oscillation on a hydraulic directional control valve. Particular attention was paid to the oscillating movement of the spool of the hydraulic directional control valve resulting from this impact. Different models of fluid and mixed friction were considered. The models analysed accounted for the relative movement of the directional control valve body and the fact that it is kinematically excited by external mechanical oscillations. It was observed that the mixed friction model, where the frictional force is considered to be the sum of molecular force

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3

Qi, Yexiong, Waqar Iqbal, and Yaming Jiang. "Study on the Multi-Directional Static Friction Properties of High Performance Yarns." Fibres & Textiles in Eastern Europe 151, no. 3 (2022): 111–15. http://dx.doi.org/10.2478/ftee-2022-0029.

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Abstract To further optimise the bullet-proof performance of textile reinforced composites, multi-directional friction tests of aramid and ultra-high molecular weight polyethylene (UHMWPE) yarns were carried out by the slope method. The influence of the included angle between the high-performance yarns on the static friction coefficient for aramid and UHMWPE yarns was studied by measuring the friction coefficient. The relationship between the static friction coefficient and the included angle among the high-performance yarns was discussed. The results showed that the friction coefficient of ar

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4

Hong, Zhipeng, Wei Hao, Liang He, Yinuo Zhang, and Zhaoyu Wen. "Analysis of Rock Friction Coefficient Characteristics Based on Friction Experimental Equipment." Rock Mechanics Letters 2, no. 2 (2025): 110–20. https://doi.org/10.70425/rml.202502.15.

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Friction coefficient, as a parameter of mechanical state, plays a crucial role in the shear failure of rocks in the field of Earth sciences. This paper investigates the frictional characteristics and anisotropy of rock by analyzing the coefficient of variation of the friction coefficient (f) and the anisotropy index of rock friction coefficients Af. Rotational friction tests were conducted using cylindrical granite against square samples of granite, sandstone, and andesite in three directions to analyze the relationship between the friction coefficient and various drilling parameters. This stu

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5

Yang, Zhenghai, Wenbo Li, Xiaowei Wang, et al. "The Influence of Surface Texture Orientation on the Current-Carrying Friction Performance of Elastic Pairs." Coatings 15, no. 7 (2025): 735. https://doi.org/10.3390/coatings15070735.

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To improve the performance of elastic current-carrying friction pairs, this study employs a wire–plate friction pair and investigates the effect of surface texture orientation on current-carrying friction performance using a self-made micro-sliding current-carrying friction wear tester. The following conclusions were drawn: The angle between texture orientation and friction direction primarily influences the friction pair’s lifespan. At 0°, the lifespan is the longest, exceeding 500 cycles, followed by 90° with a lifespan of 394 cycles, and the shortest lifespan is observed with multi-directio

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6

Chu, L., X. Cui, K. Zhang, T. F. Fwa, and S. Han. "Directional Skid Resistance Characteristics of Road Pavement: Implications for Friction Measurements by British Pendulum Tester and Dynamic Friction Tester." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 10 (2019): 793–803. http://dx.doi.org/10.1177/0361198119851453.

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The British pendulum tester (BPT) and the dynamic friction tester (DFT) are commonly used to evaluate the polishing effect of traffic on pavement skid resistance. The present study was conducted to answer two questions: (i) whether the directional moving traffic action results in significant directional differences in skid resistance of the pavement, and (ii) if so, whether BPT and DFT are effective tools for evaluating the skid resistance performance of polished pavements with significant directional skid resistance characteristics. Five in-service pavement sections with different degrees of

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7

Kim, D. H., B. M. Kim, Y. Lee, and B. H. Min. "Friction characteristics for surface finish and the stoning direction of stamping dies." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 216, no. 4 (2002): 531–42. http://dx.doi.org/10.1243/0954405021520229.

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This paper investigates the combined effects of parameters such as die surface finish, die stoning direction, contact pressure and draw speed on the resulting friction coefficient. The study shows the correlation between the artificial neural network (ANN) and the design of experiments (DOE). The ANN and the DOE have been implemented for minimizing the friction coefficient and for investigating the effect of the parameters in the straight pulling friction test effectively. The experiments were run in random order with at least three replications. It was found that directional stoning orthogona

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8

Putignano, Carmine, Giuliano Parente, Francisco Josè Profito, Caterina Gaudiuso, Antonio Ancona, and Giuseppe Carbone. "Laser Microtextured Surfaces for Friction Reduction: Does the Pattern Matter?" Materials 13, no. 21 (2020): 4915. http://dx.doi.org/10.3390/ma13214915.

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Frictional performances of different textures, including axisymmetric and directional patterns, have been tested in the mixed and the hydrodynamic lubrication regimes. Experimental results, corroborated by numerical simulations, show that the leading parameter is the geometrical pattern void ratio since a large number of dimples offers, at low speed, a trap for debris whereas, at high speed, due to the flow expansion in each micro-hole, fosters a fluid pressure drop, the consequent insurgence of micro-cavitation and, ultimately, the reductions of the shear stresses. Furthermore, in this paper,

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9

Abed, Dana, Jafar Al Thawabteh, Yazan Alzubi, Jamal Assbeihat, and Eid Al-Sahawneh. "Influence of Earthquake Parameters on the Bi-directional Behavior of Base Isolation Systems." Civil Engineering Journal 8, no. 10 (2022): 2038–52. http://dx.doi.org/10.28991/cej-2022-08-10-02.

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The introduction and development of the base isolation systems, especially the friction isolator device, were done recently to improve the capacity of adaptive behavior. The efficiency of multi-phase friction pendulums comes from their complexity, which helps reduce the structural responses and enhance structures' energy dissipation under lateral loads. Nevertheless, the influence of various earthquakes' properties on the behavior of base-isolation systems subjected to bi-directional seismic loading is still unclear. Hence, further research and studies regarding the behavior and capability of

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10

Jaculli, Marcelo A., José Ricardo P. Mendes, and Kazuo Miura. "Dynamic buckling with friction inside directional wells." Journal of Petroleum Science and Engineering 153 (May 2017): 145–56. http://dx.doi.org/10.1016/j.petrol.2017.03.040.

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11

Ezazshahabi, Nazanin, Masoud Latifi, and Mohammad Amani Tehran. "Analysis of Frictional Behavior of Woven Fabrics by a Multi-directional Tactile Sensing Mechanism." Journal of Engineered Fibers and Fabrics 10, no. 3 (2015): 155892501501000. http://dx.doi.org/10.1177/155892501501000307.

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The frictional property of woven fabrics is one of the prominent surface characteristics which influence the performance of fabrics in a variety of applications. In this paper a novel methodology and instrument is proposed to measure the tactile force between fabric and simulated skin in different directions, and the obtained data are used for assessing fabric frictional property. In this regard, nine groups of woven fabrics consisting of three weave structures and three different weft densities were tested. By fitting the data with a proper equation, the tactile force in terms of fabric direc

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12

Eigoli, A. Kamali, and GR Vossoughi. "Dynamic analysis of vibration-driven systems moving based on frictional locomotion principles." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 7 (2011): 1787–99. http://dx.doi.org/10.1177/0954406211428239.

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In this article, we investigate the dynamic analysis of vibration-driven systems moving based on frictional locomotion principles. Symmetrically actuating particles with longitudinal harmonic forces or with longitudinal vibration of the base does not lead to the net motion, unless the generated slip varies during back and forth motion. Harmonically varying the normal contact force and employing asymmetric friction coefficients are two approaches for obtaining frictional locomotion principles. In order to study the simultaneous effect of these required conditions of generating net displacement,

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13

Wang, Qing Ming, and Jia Chen Ju. "Analysis of the Effect of External Factors to the Propulsion by Inertial Centrifugal Force of Rotating Mechanism." Applied Mechanics and Materials 487 (January 2014): 343–47. http://dx.doi.org/10.4028/www.scientific.net/amm.487.343.

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The idea of inertial propulsion using rotating parts is always attractive, but great controversy also exists. Some researchers even completely negate this idea in principle, they think it would never be possible to create directional movement by the inertial force. Theory and experimental results show that, in certain conditions, directional movement can be realized by the internal inertia force of the device. In this paper, the influence of the friction condition between the propulsion devices which using rotating eccentric mass to generate inertia force and the external supporting surface on

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14

He, Jiang Fu, He Liu, Kun Yin, and Xin Gan. "Field Tests on the Application of Oscillation Tool with a Fluidic Amplifier to Directional Well Drilling." Applied Mechanics and Materials 741 (March 2015): 599–602. http://dx.doi.org/10.4028/www.scientific.net/amm.741.599.

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The directional well drilling technology is extensively utilized and developed throughout the world. However, series of drilling problems occurred in the operation process of directional drilling. In order to reduce the friction of drilling tools, an oscillation tool with a fluidic amplifier has been field tested, and the pressure pulse of oscillation tool has been obtained. Field test results have shown that the oscillation tool has an extensive flexibility to directional well drilling, and the oscillation tool could stably actuate the drilling tool to have reciprocating vibration, which cont

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15

Jiang, Wei, Cui Cui Ji, Dan Dan Zhang, Hua Xing Xiao, and Yun Tian Dai. "Fractal Characterization of Relative Movement Modes in Simulated Friction and Wear Tests." Materials Science Forum 944 (January 2019): 426–31. http://dx.doi.org/10.4028/www.scientific.net/msf.944.426.

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The selection of the relative movement mode between the friction pairs in simulated friction and wear tests is a crucial factor for the characterization and evaluation of metallic material properties. In this study, two kinds of commonly used metal materials (stainless steel 0Cr18Ni9 and aluminum alloy 2A12) were applied for the simulated friction and wear tests with four different modes of relative motion, including unidirectional, reciprocating, circular and multi-directional cross-shear. The corresponding surface topography and statistical parameters such as surface roughness Ra were obtain

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16

Wan, Ai Lan, and Wei Dong Yu. "Evaluation of The Wool Fiber Surface Modified by Chlorine and Pilling Propensity of Single Jersey." Advanced Materials Research 194-196 (February 2011): 2380–83. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.2380.

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The properties of wool fibers treated with chlorine (Basolan® 88 and Kroy-resin) were compared with surface modification observed by scanning electron microscopy (SEM), frictional properties and mechanical properties. The changes in surface morphology, frictional and physical properties of the single wool fibers are presented. Coating resin on the chlorinated wool fibers results in a significant reduction in the fiber coefficient of friction[1], as the resin smoothes the protruding edges of the fiber scales. However it increases the directional friction effect (DFE) of the fibers. It is postul

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17

Rawat, Aruna, Naseef Ummer, and Vasant Matsagar. "Performance of bi-directional elliptical rolling rods for base isolation of buildings under near-fault earthquakes." Advances in Structural Engineering 21, no. 5 (2017): 675–93. http://dx.doi.org/10.1177/1369433217726896.

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Rolling base isolation system provides effective isolation to the structures from seismic base excitations by virtue of its low frictional resistance. Herein, dynamic analysis of flexible-shear type multi-storey building mounted on orthogonally placed elliptical rolling rod base isolation systems subjected to bi-directional components of near-fault earthquake ground motions is presented. The orthogonally placed rods would make it possible to resist the earthquake forces induced in the structure in both the horizontal directions. The curved surface of these elliptical rods has a self-restoring

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18

Elgibaly, Ahmed A., Mohammed Shehata Farhat, Eric W. Trant, and Mohammed Kelany. "A study of friction factor model for directional wells." Egyptian Journal of Petroleum 26, no. 2 (2017): 489–504. http://dx.doi.org/10.1016/j.ejpe.2016.07.004.

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19

Chen, Huazhi, Shengyuan Jiang, Rongkai Liu, and Weiwei Zhang. "Particle Directional Conveyance under Longitudinal Vibration by considering the Trough Surface Texture: Numerical Simulation Based on the Discrete Element Method." Shock and Vibration 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/8260462.

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Particles can move directionally in a trough with finlike asperities under longitudinal vibrations. Here, we present an analysis of the particle conveyance mechanism and the influence of the asperity shape on the particle conveyance capacity by employing a numerical simulation based on the discrete element method (DEM). A dynamic-static matching method is proposed to characterize the three microcontact parameters in the simulation: the restitution coefficient, static friction coefficient, and rolling friction coefficient. The simulation shows that the asymmetric force induced by the finlike as

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20

Zou, Jiayan, Xingming Wang, Yunhai Wang, Yang Liu, and Ping Chen. "Modeling and friction response analysis of rocking-sliding friction of drill string in directional wells." Tribology International 193 (May 2024): 109466. http://dx.doi.org/10.1016/j.triboint.2024.109466.

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21

Mitchell, Jeffrey P., Seung-Un Chae, Yoo-Jae Kim, and Mohamed E. Abaza. "Finite Element Analysis Using the Crack Strain Separation Model for Reinforced Concrete Membrane." Buildings 13, no. 8 (2023): 1896. http://dx.doi.org/10.3390/buildings13081896.

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This paper presents a finite element analysis of the bi-directional orthogonal model, which incorporates individual crack strain separation and tracking. The objective of this research is to expand the current shear friction model to manage bi-directional cracking at any angle, allowing for a more universal model that can be applied to intricate structures and non-proportional loading cases. The proposed model was initially developed as a total strain-based model, with the assumption that crack strains are equivalent to total strains, but it was subsequently recalculated to improve accuracy by

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22

Wang, Wen’an, Zhiqi Liu, and Dongliang Chen. "Influence of different oil flow directions on the friction performance of asymmetric structures in heavy load hydraulic friction pairs." AIP Advances 13, no. 1 (2023): 015028. http://dx.doi.org/10.1063/5.0137503.

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Textures have obvious anti-friction and anti-wear effects, but effective textures often have complex and asymmetric characteristics. Because of the texture’s directional lubrication effect and fluid diode effect, different oil flow directions influence the friction reduction effect of asymmetric texture. Simulations and test methods are used to characterize these effects, and the friction coefficient and wear amount are used as evaluation methods to determine the optimal oil flow direction of asymmetric textures. The results show that an appropriate oil flow direction can significantly change

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23

Abe, Koyu, Yusuke Tanida, and Masaru Uchiyama. "Structural Analysis of Directional Deflection Beams." Journal of Robotics and Mechatronics 17, no. 3 (2005): 359–66. http://dx.doi.org/10.20965/jrm.2005.p0359.

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Parallel leaf springs are often used for precise linear motion because of their simplicity and freedom from static friction in cases where elasticity and high deformation are required. Using a parallel beam in force sensing requires minimum deflection and limited stress concentration. We previously proposed a unidirectional force sensor based on the H-slit parallel beam structure – an extension of conventional parallel beam. In this paper, we use finite element analysis (FEA) to investigate parallel beam structures that deflect easily in one direction, and evaluate the optimum profile for the

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24

Rochdi, M., M. Shillor, and M. Sofonea. "A quasistatic contact problem with directional friction and damped response." Applicable Analysis 68, no. 3-4 (1998): 409–22. http://dx.doi.org/10.1080/00036819808840639.

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25

Buttsworth, D. R., S. J. Elston, and T. V. Jones. "Directional sensitivity of skin friction measurements using nematic liquid crystal." Measurement Science and Technology 9, no. 11 (1998): 1856–65. http://dx.doi.org/10.1088/0957-0233/9/11/011.

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26

Lu, Ping, Robert J. K. Wood, Mark G. Gee, Ling Wang, and Wilhelm Pfleging. "The use of anisotropic texturing for control of directional friction." Tribology International 113 (September 2017): 169–81. http://dx.doi.org/10.1016/j.triboint.2017.02.005.

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27

Troyanovskaya, Irina, A. Zhakov, O. Grebenshchikova, S. Voinash, and E. Timofeev. "Directional stability of an agricultural tractor." FME Transactions 49, no. 2 (2021): 456–62. http://dx.doi.org/10.5937/fme2102456t.

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The discrepancy between the plow width and the tractor width leads to the asymmetry of plowing units. The geometry of the plowshare surface of the moldboard plow contributes to the generation of lateral forces on the working tool. All this leads to the imbalance of the tool and the deviation of the tractor from straight-line movement during plowing. To maintain straight-line movement, the driver has to adjust the machine every 5-10 meters, which is highly tiresome. To study the causes of lateral slips of the plowing unit, we constructed a mathematical model, which consists of the equations of

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28

Yerlikaya, Hakan, and Satsuya Soda. "Experimental and analytical study on sliding vibration of a solid body." Journal of Vibration and Control 25, no. 18 (2019): 2480–93. http://dx.doi.org/10.1177/1077546319857631.

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It is accepted that the use of base isolation systems within a structure offers a decreased amount of maximum acceleration value throughout the structure and provides a higher level of comfort and safety to the residents even during extremely strong ground motions. We want to propose a new low-cost structural system with the aforementioned benefits of the base isolation. A structural model was developed using an ultra-high-molecular-weight polyethylene film as a friction surface for the whole concrete base of a residential house, creating a friction-based base-isolation system. To understand t

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29

Zhang, Zengbao, Jianbo Lv, Xiaoming Zhu, and Yuxin Liu. "Application evaluation of TORSION DRILLING string." Journal of Physics: Conference Series 2808, no. 1 (2024): 012044. http://dx.doi.org/10.1088/1742-6596/2808/1/012044.

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Abstract The drill string torsion system, represented by Slider and Rocket, has been widely used around the world. It provides a solution with a high performance-price ratio to solve the problem of supporting pressure in sliding drilling. In recent years, the torsional system of drill string has been applied to a certain extent in China and has achieved good results in reducing resistance and increasing speed. Based on the analysis of the system composition, system functions, technical advantages, and application of the TORSION DRILLING string TORSION system, this paper summarizes the results

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30

Liu, Yu, Xi Chen, and Kai Tang. "Research on the Charged Omni-Directional Spatial Electric Field Tester." Advanced Materials Research 681 (April 2013): 110–14. http://dx.doi.org/10.4028/www.scientific.net/amr.681.110.

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The spatial electric field tester is mainly used for the measurement of high-altitude electrostatic field. The spatial electric field tester will be electrostatically charged during the period it is sent to a certain height by a micro-rocket. In order to study the charge characteristics, the paper analyzes the charging mechanism of the omni-directional spatial electric field tester and builds mathematics model for the friction charging, which is a main factor of the charging process. The numerical calculation and experimental research demonstrate that the friction introduces a slow charge accu

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31

Oliveto, Nicholas D. "Geometrically nonlinear analysis of friction pendulum systems under tri-directional excitation." Engineering Structures 269 (October 2022): 114770. http://dx.doi.org/10.1016/j.engstruct.2022.114770.

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32

Gidoni, Paolo, and Antonio DeSimone. "On the genesis of directional friction through bristle-like mediating elements." ESAIM: Control, Optimisation and Calculus of Variations 23, no. 3 (2017): 1023–46. http://dx.doi.org/10.1051/cocv/2017030.

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33

Bakre, S. V., R. S. Jangid, and G. R. Reddy. "Response of piping system on friction support to bi-directional excitation." Nuclear Engineering and Design 237, no. 2 (2007): 124–36. http://dx.doi.org/10.1016/j.nucengdes.2005.12.012.

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34

Sugiura, Takanori, Masamichi SAKAGUCHI, and Hideo FUJIMOTO. "1P1-D08 Study on Directional Control Using Rotor Friction Haptic Interface." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2006 (2006): _1P1—D08_1—_1P1—D08_2. http://dx.doi.org/10.1299/jsmermd.2006._1p1-d08_1.

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35

Okabe, S., Y. Yokoyama, and G. Boothroyd. "Analysis of vibratory feeding where the track has directional friction characteristics." International Journal of Advanced Manufacturing Technology 3, no. 4 (1988): 73–85. http://dx.doi.org/10.1007/bf02601835.

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36

Maidla, Eric E., and Andrew K. Wojtanowicz. "A field method for assessing borehole friction for directional well casing." Journal of Petroleum Science and Engineering 1, no. 4 (1988): 323–33. http://dx.doi.org/10.1016/0920-4105(88)90007-1.

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37

Wu, Zhangbin, Mao Chen, Qiuyu Li, et al. "Mechanical Modeling and Dynamic Characteristics of a Three-Directional Vibration Absorber." Applied Sciences 15, no. 8 (2025): 4420. https://doi.org/10.3390/app15084420.

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Vibration is a prevalent phenomenon in mechanical systems, often adversely affecting equipment performance and operational stability. To address this issue, this study proposes a novel three-directional vibration absorber, which provides stiffness in three orthogonal directions. The mechanical properties of the isolator are theoretically analyzed, focusing on its load-bearing capacity and working stroke, which are influenced by the initial configuration angle of the spring assembly. The dynamic characteristics of the proposed isolator are evaluated by comparing its peak dynamic displacement an

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38

Xue, Tiantian. "Research Status of Friction Interface Evolution Mechanism of Non-magnetic Steel." International Journal of Mechanical and Electrical Engineering 2, no. 3 (2024): 1–10. http://dx.doi.org/10.62051/ijmee.v2n3.01.

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The non-magnetic drill pipe (composed of male and female thread joints and rod bodies) is the key component of the directional drilling technology equipment for gas extraction in coal mine tunnels. The thread joint and the drill pipe body are connected by continuous drive friction welding. In the study, it was found that the banded structure appeared in the joint of continuous drive friction welding of non-magnetic steel, which reduced the strength of drill pipe. At the same time, it is found that the heat flow mode is one of the key factors affecting the banded structure, and the heat flow mo

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39

Wang, Zhiyu, and Changming Hu. "Examining Pipe–Borehole Wall Contact and Pullback Loads for Horizontal Directional Drilling." Applied Sciences 14, no. 19 (2024): 8841. http://dx.doi.org/10.3390/app14198841.

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Pipeline pullback load is a crucial basis for drill rig selection and pipeline strength design. This paper presents a new pullback load calculation model from the perspective of pipe–borehole wall contact. The pipe–borehole wall contact analysis includes the distribution of contact pressure and the relationship between the external load and compressive displacement. The friction force between the pipe and the borehole wall was calculated based on the pipe–borehole wall contact analysis and adhesion theory without depending on the empirical friction coefficient. The effects of the eccentricity

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40

Tong, Hua, and Yongbo Shao. "Mechanical Analysis of DS in Horizontal Directional Drilling." Applied Sciences 12, no. 6 (2022): 3145. http://dx.doi.org/10.3390/app12063145.

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In recent years, trenchless horizontal directional drilling (HDD) technology has developed rapidly towards the direction of large pipe diameter and long span. During construction, the buckling deformation and large drag torque of the drillstring (DS) are the key problems restricting the development of the HDD technology. In order to understand the buckling deformation law of the DS in horizontal directional drilling engineering, as well as the transfer and the distribution of the drag torque, and the relationship between the buckling deformation and drag torque, the dynamic model of the DS sys

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41

Tanaka, Yoshimi, Kentaro Ito, Toshiyuki Nakagaki, and Ryo Kobayashi. "Mechanics of peristaltic locomotion and role of anchoring." Journal of The Royal Society Interface 9, no. 67 (2011): 222–33. http://dx.doi.org/10.1098/rsif.2011.0339.

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Limbless crawling is a fundamental form of biological locomotion adopted by a wide variety of species, including the amoeba, earthworm and snake. An interesting question from a biomechanics perspective is how limbless crawlers control their flexible bodies in order to realize directional migration. In this paper, we discuss the simple but instructive problem of peristalsis-like locomotion driven by elongation–contraction waves that propagate along the body axis, a process frequently observed in slender species such as the earthworm. We show that the basic equation describing this type of locom

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42

Ponikarov, Sergey, and Artem Ponikarov. "Dynamometric study of rod pumps with physical wear." E3S Web of Conferences 592 (2024): 04012. http://dx.doi.org/10.1051/e3sconf/202459204012.

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Rod pumping units are widely used in mature oil fields to artificially lift crude oil to the surface. However, during operation, common failures include rod breaks, pump valve malfunctions, and stuck rods. Incorrect diagnosis of these issues leads to inefficient repair planning and significant financial losses. Rod breaks in particular are dangerous as they can cause sparks, increasing explosion and fire risk. This paper analyzes the causes of sucker rod pump failures using the Novo-Elkhovskoye field as a case study. The authors propose introducing modern technologies and protection systems to

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43

Hussain, Abrar, Vitali Podgursky, Dmitri Goljandin, et al. "Tribological and Mechanical Properties Investigations of Post-Consumer Cotton Textiles." Solid State Phenomena 320 (June 30, 2021): 97–102. http://dx.doi.org/10.4028/www.scientific.net/ssp.320.97.

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In this manuscript surface roughness, coefficient of friction (COF) and tensile properties of a post-consumer cotton fabric are evaluated. Fabric roughness, COF, effective tensile force and breaking force measured by optical profilometer, CETR tribometer and Instron tensile machine, respectively. The results proved that COF could rely on fabric pattern. Moreover, microscopically roughness influences on friction and tensile properties due to surface defects. It was found that increase in roughness of textile cotton relates to increase of number of random directional fibers. These fibers intensi

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44

Kilikevičius, Sigitas, Algimantas Fedaravičius, Virginija Daukantienė, Kristina Liutkauskienė, and Linas Paukštaitis. "Manipulation of Miniature and Microminiature Bodies on a Harmonically Oscillating Platform by Controlling Dry Friction." Micromachines 12, no. 9 (2021): 1087. http://dx.doi.org/10.3390/mi12091087.

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Currently used nonprehensile manipulation systems that are based on vibrational techniques employ temporal (vibrational) asymmetry, spatial asymmetry, or force asymmetry to provide and control a directional motion of a body. This paper presents a novel method of nonprehensile manipulation of miniature and microminiature bodies on a harmonically oscillating platform by creating a frictional asymmetry through dynamic dry friction control. To theoretically verify the feasibility of the method and to determine the control parameters that define the motion characteristics, a mathematical model was

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Mao, Xuyao, Zhengjiang Wu, Yuan Qian, Baoping Zeng, and Yiou Liu. "Design and Simulation of an O-type 3-position-4-way Directional Valve with Zero Leakage in the Mid-position." Journal of Physics: Conference Series 2343, no. 1 (2022): 012009. http://dx.doi.org/10.1088/1742-6596/2343/1/012009.

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An O-type 3-position-4-way directional valve based on a pilot K-type spool valve and four B-type cartridge units with almost zero leakage in the mid-position is designed. Compared with an O-type3-position-4-way directional valve with an ordinary spool structure, under the same design requirements of nominal diameter, clearances, external load, etc., the mid-position leakage of the new valve is greatly reduced to nearly zero, that is, the new valve has excellent mid-position retention performance. The influence of fitting clearances between the pilot valve spool and valve sleeve (including unev

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Madsen, Ole Secher, Ying-Keung Poon, and Hans C. Graber. "SPECTRAL WAVE ATTENUATION BY BOTTOM FRICTION: THEORY." Coastal Engineering Proceedings 1, no. 21 (1988): 34. http://dx.doi.org/10.9753/icce.v21.34.

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Based on the linearized form of the boundary layer equations and a simple eddy viscosity formulation of shear stress, the turbulent bottom boundary layer flow is obtained for a wave motion specified by its directional spectrum. Closure is obtained by requiring the solution to reduce, in the limit, to that of a simple harmonic wave. The resulting dissipation is obtained in spectral form with a single friction factor determined from knowledge of the bottom roughness and an equivalent monochromatic wave having the same root-mean-square near-bottom orbital velocity and excursion amplitude as the s

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Holenko, K. E., A. A. Vychavka, M. O. Dykha, and V. O. Dytyniuk. "Finite-element analysis of contact characteristics and friction modes of the "valve-guide" of the internal combustion engine." Problems of Tribology 29, no. 3/113 (2024): 43–55. http://dx.doi.org/10.31891/2079-1372-2024-113-2-43-55.

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Modeling the performance of the "valve-guide" engine pair using modern software is an effective tool both for identifying weak points in the design and for predicting the behavior of the friction unit in operation. In this study, the method of finite element analysis was chosen as a tool to study the contact and antifriction parameters of the friction pair of the internal combustion engine "directional valve". Using the FEM application program, the raw data on the material, surface dimensions, loads, and motion kinematics are described. Based on the constructed finite-element model of the "val

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Chen, Yong, Hao Yu, Qiugui Shu, and Fang Fang. "Experimental study of friction coefficient of rocks in high pressure and tight gas reservoirs in Sichuan." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 232, no. 11 (2018): 1415–27. http://dx.doi.org/10.1177/1350650117754001.

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The calculation of torque and drag in horizontal wells and extended reach wells is an important element in drilling operations, but determining the value of the friction factor is difficult in the calculation of friction. Sichuan Basin constitutes a special gas reservoir system with high pressure and tight formations. They are favorable for gas production which can be accomplished economically only with horizontal drilling and hydraulic fracturing, and Xujiahe Formation is the focus of the exploration and development. In order to determine the reasonable friction factor for directional well an

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Zhang, Xu, Jia-Hui Cao, Bao-Quan Ai, Tian-Fu Gao, and Zhi-Gang Zheng. "Investigation on the directional transportation of coupled Brownian motors with asymmetric friction." Acta Physica Sinica 69, no. 10 (2020): 100503. http://dx.doi.org/10.7498/aps.69.20191961.

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Jangid, R. S. "Response of pure-friction sliding structures to bi-directional harmonic ground motion." Engineering Structures 19, no. 2 (1997): 97–104. http://dx.doi.org/10.1016/s0141-0296(96)00055-7.

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