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Articles de revues sur le sujet « Search friction »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Keymolen, Esther. "In Search of Friction." Techné: Research in Philosophy and Technology 25, no. 3 (2021): 354–78. http://dx.doi.org/10.5840/techne20211124150.

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Considering the key mediating role that smartphones play in everyday life, a postphenomenological analysis to better understand how we have power over these devices, how these artifacts empower and simultaneously can overpower us, seems highly relevant. This article will show that in order to engage in such a much-needed postphenomenological analysis, we will first have to address three fundamental, methodological challenges. The first challenge is brought forth by the personalized interface of smartphones, hindering postphenomenologists to unravel the so-called multistability of the device th

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Kou, Bin, Yao Huang, Pengpeng Wang, Dongcheng Ren, Jie Zhang, and Shijie Guo. "A New Parameter Identification Method for Industrial Robots with Friction." Machines 10, no. 5 (2022): 349. http://dx.doi.org/10.3390/machines10050349.

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Commonly used intelligent algorithms that are used to identify the parameters of friction of industrial robots have poor accuracy or involve complex coding, which is not conducive to their use in engineering. This paper uses the random wandering simulated annealing-based variable-step beetle antennae search (RWSAVSBAS) algorithm to identify the parameters of friction of industrial robots. The moment of friction of the third joint of the robot is experimentally obtained and used to establish a Stribeck friction model. Following this, the RWSAVSBAS algorithm is used to identify the frictional pa

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3

Othman, M. O., and A. Seireg. "A Procedure for Evaluating the Friction Properties of Hertzian Contacts Under Reciprocating Sliding Motion." Journal of Tribology 112, no. 2 (1990): 361–64. http://dx.doi.org/10.1115/1.2920265.

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The study reported in this paper presents an empirical procedure for evaluating the frictional properties in Hertzian contacts subjected to sinusoidal sliding motion. It utilizes the friction induced lateral vibration of a rod to evaluate the parameters of the frictional function using a gradient search which minimize the error between the analytical response and the friction-induced experimental vibrations. The use of sinusoidal sliding motion at the resonant frequencies of the vibrating rod is found to considerably minimize the effect of external vibrations on the experimental results.

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Cebul, Randall D., James B. Rebitzer, Lowell J. Taylor, and Mark E. Votruba. "Unhealthy Insurance Markets: Search Frictions and the Cost and Quality of Health Insurance." American Economic Review 101, no. 5 (2011): 1842–71. http://dx.doi.org/10.1257/aer.101.5.1842.

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We analyze the effect of search frictions in the market for commercial health insurance. Frictions increase insurance premiums (enough to transfer 13.2 percent of consumer surplus from fully insured employer groups to insurers—approximately $34.4 billion in 1997); and increase insurance turnover (by 64 percent for the average policy). This rent transfer harms consumers and—when combined with heightened turnover—reduces incentives to invest in future health. We also find that a publicly financed insurance option can improve the efficiency of private insurance markets by reducing search friction

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Shao, Liang, Chi Jin, Arno Eichberger, and Cornelia Lex. "Grid Search Based Tire-Road Friction Estimation." IEEE Access 8 (2020): 81506–25. http://dx.doi.org/10.1109/access.2020.2991792.

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Hiki, Y., M. Tanahashi, and Shin Takeuchi. "Search for High Damping Metallic Glasses." Key Engineering Materials 319 (September 2006): 151–56. http://dx.doi.org/10.4028/www.scientific.net/kem.319.151.

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In a hydrogen-doped metallic glass, there appear low-temperature and high-temperature internal friction peaks respectively associated with a point-defect relaxation and the crystallization. The high-temperature-side slope of low-temperature peak and also the low-temperature-side slope of high-temperature peak enhance the background internal friction near the room temperature. A hydrogen-doped Mg-base metallic glass was proposed as a high-damping material to be used near and somewhat above the room temperature. Stability of the high damping was also checked.

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Mortensen, Dale T. "Markets with Search Friction and the DMP Model." American Economic Review 101, no. 4 (2011): 1073–91. http://dx.doi.org/10.1257/aer.101.4.1073.

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Ehsani, Sayeh, Marie-Alice Mandich, Tarek H. El-Bialy, and Carlos Flores-Mir. "Frictional Resistance in Self-Ligating Orthodontic Brackets and Conventionally Ligated Brackets." Angle Orthodontist 79, no. 3 (2009): 592–601. http://dx.doi.org/10.2319/060208-288.1.

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Abstract Objective: To compare the amount of expressed frictional resistance between orthodontic self-ligating brackets and conventionally ligated brackets in vitro as reported in the literature. Methods: Several electronic databases (Medline, PubMed, Embase, Cochrane Library, and Web of Science) were searched without limits. In vitro studies that addressed friction of self-ligating brackets compared with conventionally ligated brackets were selected and reviewed. In addition, a search was performed by going through the reference lists of the selected articles to identify any paper that could

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Ding, Li, Xingcheng Li, Qilin Li, and Yuan Chao. "Nonlinear Friction and Dynamical Identification for a Robot Manipulator with Improved Cuckoo Search Algorithm." Journal of Robotics 2018 (2018): 1–10. http://dx.doi.org/10.1155/2018/8219123.

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This paper concerns the problem of dynamical identification for an industrial robot manipulator and presents an identification procedure based on an improved cuckoo search algorithm. Firstly, a dynamical model of a 6-DOF industrial serial robot has been derived. And a nonlinear friction model is added to describe the friction characteristic at motion reversal. Secondly, we use a cuckoo search algorithm to identify the unknown parameters. To enhance the performance of the original algorithm, both chaotic operator and emotion operator are employed to help the algorithm jump out of local optimum.

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Mazur, Jacek, Renata Różyło, Monika Wójcik, Marian Panasiewicz, Kazimierz Zawiślak, and Paweł Sobczak. "Development of an Innovative Attachment Determining Friction Parameters for Quality Assessment in Sustainable Processing." Sustainability 14, no. 20 (2022): 12986. http://dx.doi.org/10.3390/su142012986.

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New trends forcing the attractiveness of products in sustainable processing make it necessary to search for innovative methods of measuring their quality. For various biological materials, their physical properties, such as friction parameters in addition to their texture, are very important. Friction determines the course of many technological operations, e.g., transport, cleaning, sorting, fractionation, storage, and dosing of materials. An innovative friction adapter was developed for biological raw materials and tested on samples of self-produced soap. A 3D printing method for the producti

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Sarasiri, Nuapett, Kittiwong Suthamno, and Sarawut Sujitjorn. "Bacterial Foraging-Tabu Search Metaheuristics for Identification of Nonlinear Friction Model." Journal of Applied Mathematics 2012 (2012): 1–23. http://dx.doi.org/10.1155/2012/238563.

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This paper proposes new metaheuristic algorithms for an identification problem of nonlinear friction model. The proposed cooperative algorithms are formed from the bacterial foraging optimization (BFO) algorithm and the tabu search (TS). The paper reports the search comparison studies of the BFO, the TS, the genetic algorithm (GA), and the proposed metaheuristics. Search performances are assessed by using surface optimization problems. The proposed algorithms show superiority among them. A real-world identification problem of the Stribeck friction model parameters is presented. Experimental se

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Sun, Qinqin, Xiuye Wang, and Ye-Hwa Chen. "Modern explorations of the Brachistochrone-related problem: using the Udwadia–Kalaba approach." Mathematics and Mechanics of Solids 24, no. 6 (2018): 1849–72. http://dx.doi.org/10.1177/1081286518808070.

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Modern explorations regarding the search for a curve subject to a minimization principle and its inverse, namely the search for the minimization object based on a given curve, are made. By using the Udwadia–Kalaba theory, which subsumes the Coulomb friction force as a non-ideal constraint, we obtain the analytic expression of the equation of motion for a particle moving along the Brachistochrone cycloid curve under Coulomb friction. Then we perform the inverse problem for the moving particle. That is, while the Brachistochrone cycloid curve is given, we seek the corresponding minimization obje

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Paul, Harold R., and James A. Scherocman. "Friction Testing of Tack Coat Surfaces." Transportation Research Record: Journal of the Transportation Research Board 1616, no. 1 (1998): 6–12. http://dx.doi.org/10.3141/1616-02.

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In response to litigation because of an accident case involving tack coat on a construction project, a field trial was evaluated to determine frictional characteristics of tack-coated surfaces. When a literature search on this topic returned little information, state Department of Transportation materials engineers were surveyed to determine the state of the practice with respect to tack coat operations. On the basis of the survey responses and the existing litigation, a field trial was conducted to evaluate friction numbers on tack coat materials. Variables included residual asphalt content (

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14

Nourinejad, Mehdi, Amir Gandomi, and Matthew J. Roorda. "Illegal parking and optimal enforcement policies with search friction." Transportation Research Part E: Logistics and Transportation Review 141 (September 2020): 102026. http://dx.doi.org/10.1016/j.tre.2020.102026.

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Kula, Piotr, Robert Pietrasik, Sylwester Pawęta, and Jarosław Komorowski. "MOS2/WS2/FINELPN COMPOSITE LAYERS – A NEW APPROACH TO LOW FRICTIONAL COATINGS FOR PISTON RINGS." Tribologia 301, no. 3 (2022): 49–58. http://dx.doi.org/10.5604/01.3001.0016.1024.

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In the search for alternative processes of technologically difficult and environmentally dangerous galvanic chromium coatings on cast iron piston rings, composite coatings of low-friction nanoparticles MoS2, WS2 and/or rGO embedded in a hard matrix of iron nitrides have been investigated. Laboratory tribological and operational tests on a real aircraft engine have been carried out to select the optimal technological parameters and microstructures of low frictional layers. A dry friction coefficient of 0.13 has been obtained for the best of the processes, i.e., four times lower than for raw ref

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16

Wang, Yuxiang, Zhangwei Chen, Hongfei Zu, and Xiang Zhang. "An Optimized RBF Neural Network Based on Beetle Antennae Search Algorithm for Modeling the Static Friction in a Robotic Manipulator Joint." Mathematical Problems in Engineering 2020 (February 12, 2020): 1–10. http://dx.doi.org/10.1155/2020/5839195.

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Friction is a nonlinear effect that occurs in all mechanical systems which may cause limit cycles, tracking errors, and other undesirable effects. Traditional static friction models cannot characterize all the friction situations. In recent years, neural network (NN) technique has been widely used to approximate the nonlinear function. In this paper, a new method which combines radical basis function neural network (BRFNN) with beetle antennae search (BAS) algorithm for modeling friction in a robotic joint is proposed. Velocity, load, and temperature are considered as the three factors that in

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Тихомиров, Виктор, Viktor Tikhomirov, Надежда Новикова, and Nadezhda Novikova. "Application of neurocomputing robust design to optimize the friction sintered powder material." Bulletin of Bryansk state technical university 2014, no. 3 (2014): 81–84. http://dx.doi.org/10.12737/23225.

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The paper presents a methodology for selecting the optimal composition of the friction sintered powder material to the safety of the friction devices using a neurocomputer robust design to reduce the search time and reduce the cost of the experiment and the analysis of the computational experiment.

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18

Ibrahim, Aminu O., Ademoh N. Ali, Lawal S. Albert, et al. "DEVELOPMENT OF BIODEGRADABLE LUBRICATING OIL FOR TURBINE BEARING FROM PALM KERNEL AND CASTOR OILS." FUDMA JOURNAL OF SCIENCES 9, no. 4 (2025): 145–54. https://doi.org/10.33003/fjs-2025-0904-3318.

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The search for sustainable and environmentally friendly alternatives to conventional mineral-based oil lubricants has led to increasing research into bio-based lubricants for industrial applications. This study develops biodegradable lubricating oil for turbine bearing from palm kernel and castor oils through chemical modification and additive blending. Using transesterification method, the oils were converted to their various methyl esters and blended with additives such as ethylene glycol, ascorbic acid, trimethylopropane, and graphene. Physiochemical evaluations of both palm kernel and cast

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19

Rosyid, Abdur, and Bashar El-Khasawneh. "Identification of the Dynamic Parameters of a Parallel Kinematics Mechanism with Prismatic Joints by Considering Varying Friction." Applied Sciences 10, no. 14 (2020): 4820. http://dx.doi.org/10.3390/app10144820.

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This study proposed a novel approach for the offline dynamic parameter identification of parallel kinematics mechanisms in which the friction is significant and varying. Since the friction is significant, it should be incorporated to provide an accurate dynamic model. Furthermore, the varying normal forces as a result of the changing posture of the mechanism lead to varying friction forces, specifically varying static and Coulomb friction forces. By considering this variation, the static and Coulomb friction parameters are identified as coefficients instead of forces. A bound-constrained optim

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Huang, Shiuh Jer, Chun Ming Chiu, and M. C. Huang. "LuGre Friction Model Estimation of a Precision Table and Sliding Mode Control Design." Solid State Phenomena 147-149 (January 2009): 264–71. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.264.

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Piezoelectric friction actuating mechanism is chosen to construct long traveling range sub-micro X-Y positioning table. LuGre friction model is employed to simulate the friction dynamics of this positioning mechanism. The optimization scheme of Matlab toolbox is adopted to search the optimal friction model parameters. However, this piezoelectric actuating system has obvious nonlinear and time-varying dead-zone offset control voltage due to the static friction and preload. The estimated LuGre dynamic model is still not accurate enough for model-based precision control design. Hence, the adaptiv

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Trzepiecinski, Tomasz, and Hirpa G. Lemu. "Recent Developments and Trends in the Friction Testing for Conventional Sheet Metal Forming and Incremental Sheet Forming." Metals 10, no. 1 (2019): 47. http://dx.doi.org/10.3390/met10010047.

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Friction is the main phenomenon that has a huge influence on the flow behavior of deformed material in sheet metal forming operations. Sheet metal forming methods are one of the most popular processes of obtaining finished products, especially in aerospace, automobile, and defense industries. Methods of sheet forming are carried out at different temperatures. So, it requires tribological tests that suitably represent the contact phenomena related to the temperature. The knowledge of the friction properties of the sheet is required for the proper design of the conditions of manufacturing proces

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Nazarov, Alexander, Sergey Krivoshapov, and Nikolay Sergienko. "EVALUATION OF RELATIVE WEAR OF FRICTION SURFACES OF DISC BRAKE MECHANISMS OF PASSENGER CARS." Bulletin of the National Technical University «KhPI». Series: Automobile and Tractor Construction, no. 1 (March 19, 2023): 26–35. http://dx.doi.org/10.20998/2078-6840.2022.1.04.

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The article provides a search and analysis of the design parameters of disc brake mechanisms that provide regulated braking efficiency and wear resistance of friction pairs in order to increase their durability. To assess the relative wear of the friction surfaces of the disc brake mechanisms of passenger cars, an assessment was made of the parameters that can characterize the wear of the interface. On the example of Lanos passenger cars, the possibilities of prospects for further calculation of the coefficients of wear resistance of materials of friction bodies using generalized mathematical

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Willems, Phil, Corinne Lamb, Alastair Heptonstall, and Jim Hough. "Search for stress dependence in the internal friction of fused silica." Physics Letters A 319, no. 1-2 (2003): 8–12. http://dx.doi.org/10.1016/j.physleta.2003.09.070.

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Lin, Chih Jer, Shen Kai Yu, Bo Yen Ho, and Chin Sheng Chen. "Identification on Nonlinear Friction Model and Tracking Control for a Ball-Screw Actuated Stage Using Modified Charge System Search." Key Engineering Materials 625 (August 2014): 423–29. http://dx.doi.org/10.4028/www.scientific.net/kem.625.423.

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High precise positioning and high-speed performance are demanded for servo mechanical systems in recent industry. However, the nonlinear friction is a main factor to make the positioning mechanism imprecision. To improve the positioning the positioning precision of stages driven by ball-screws, there are two types of compensations including model and non-model based methods. In this study, the LuGre friction Model is applied to model the nonlinear friction behavior for a ball-screw driven stage. A Modified Charge Search System (MCSS) was proposed to identify the system’s parameter. After the s

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Gardner, Benjamin, and Yesol Huh. "Information Friction in OTC Interdealer Markets." Finance and Economics Discussion Series, no. 2024-040 (June 2024): 1–30. http://dx.doi.org/10.17016/feds.2024.040.

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In over-the-counter (OTC) securities markets, interdealer markets are an important venue through which dealers can offload positions and share risk amongst themselves. Contrary to the popular conception that search frictions matter the most in OTC markets, we find that in the interdealer market for U.S. corporate bonds, information frictions are most relevant. Large dealers face large and informed customers and pay more than small dealers to transact in the interdealer market, despite on average providing liquidity to other dealers. Large dealers tend to trade through interdealer brokers (IDBs

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Giustolisi, O., L. Berardi, and T. M. Walski. "Some explicit formulations of Colebrook–White friction factor considering accuracy vs. computational speed." Journal of Hydroinformatics 13, no. 3 (2010): 401–18. http://dx.doi.org/10.2166/hydro.2010.098.

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The Colebrook–White formulation of the friction factor is implicit and requires some iterations to be solved given a correct initial search value and a target accuracy. Some new explicit formulations to efficiently calculate the Colebrook–White friction factor are presented herein. The aim of this investigation is twofold: (i) to preserve the accuracy of estimates while (ii) reducing the computational burden (i.e. speed). On the one hand, the computational effectiveness is important when the intensive calculation of the friction factor (e.g. large-size water distribution networks (WDN) in opti

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Yin, Guanghua, Minglei Ma, Peng Jia, and Xinxu Ma. "Parameter Optimization of Friction Pendulum Bearings Based on the Adaptive Genetic Algorithm Considering the Overall Evolutionary Status." Buildings 14, no. 2 (2024): 435. http://dx.doi.org/10.3390/buildings14020435.

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Improper design of friction pendulum bearings can lead to poor seismic reduction performance and may result in the failure of local vulnerable components. And the parameter design of friction pendulum bearings mainly relies on experience and verification calculations at present. This paper proposes an adaptive genetic algorithm considering the overall evolution state of the population, adjusting crossover and mutation probabilities adaptively based on individual fitness and population diversity. Compared to traditional algorithms, it exhibits better global search capabilities and convergence e

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Choi, S. H., C. O. Lee, and H. S. Cho. "Friction compensation control of an electropneumatic servovalve by using an evolutionary algorithm." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 214, no. 3 (2000): 173–84. http://dx.doi.org/10.1243/0959651001540546.

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A poppet-type electropneumatic servovalve developed in this study utilizes a poppet directly operated by a moving-coil actuator in the metering stage and is controlled by a digital controller. This servovalve is insensitive to air contamination and has no problem of air leakage at null, but it has relatively large friction between the O-rings installed in the peripheral grooves of the balance pistons and the valve sleeve. For friction compensation control, a static friction model that enables simulation of the stick-slip phenomena and a dynamic model that captures the friction behaviour such a

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Liu, LL, and ZY Wu. "A new identification method of the Stribeck friction model based on limit cycles." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 15 (2014): 2678–83. http://dx.doi.org/10.1177/0954406214521604.

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This paper presents a new parameter identification method of the Stribeck friction model based on limit cycles. A single degree of freedom mass spring system driven by a belt is studied, and the Stribeck friction model is established between the mass and belt. Limit cycle oscillation will occur when the system is unstable. The limit cycle curve is described by some main shape characteristic parameters using the modified Freeman chain code method. Thus, the Stribeck friction parameters can be identified by using the ergodic search method to minimize the Euclidean distance of the theoretical and

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Chainarong, Suppachai, Thanatkij Srichok, Rapeepan Pitakaso, Worapot Sirirak, Surajet Khonjun, and Raknoi Akararungruangku. "Variable Neighborhood Strategy Adaptive Search for Optimal Parameters of SSM-ADC 12 Aluminum Friction Stir Welding." Processes 9, no. 10 (2021): 1805. http://dx.doi.org/10.3390/pr9101805.

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In this study, we present a new algorithm for finding the optimal friction stir welding parameters to maximize the tensile strength of a butt joint made of the semisolid material (SSM) ADC 12 aluminum. The welding parameters were rotational speed, welding speed, tool tilt, tool pin profile, and rotational direction. The method presented is a variable neighborhood strategy adaptive search (VaNSAS) approach. The process of finding the optimal friction stir welding parameters comprises five steps: (1) identifying the type and range of friction stir parameters using a literature survey; (2) perfor

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Carrara, Valdemir, and Hélio Koiti Kuga. "Estimating Friction Parameters in Reaction Wheels for Attitude Control." Mathematical Problems in Engineering 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/249674.

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The ever-increasing use of artificial satellites in both the study of terrestrial and space phenomena demands a search for increasingly accurate and reliable pointing systems. It is common nowadays to employ reaction wheels for attitude control that provide wide range of torque magnitude, high reliability, and little power consumption. However, the bearing friction causes the response of wheel to be nonlinear, which may compromise the stability and precision of the control system as a whole. This work presents a characterization of a typical reaction wheel of 0.65 Nms maximum angular momentum

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Jassim, Najwa Wasif, and Shaymaa alsafi. "Study The Consequence of Fly Ash on Some of Physical Soil Characteristics." IOP Conference Series: Earth and Environmental Science 961, no. 1 (2022): 012089. http://dx.doi.org/10.1088/1755-1315/961/1/012089.

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Abstract Study the consequence of adding fly ash (FA) on the Atterberg limit; cohesions and internal friction of angles of the verified soil was the aim of this search. The tested soil according to the system of unified soil classification was (CH) group. Fly ash (FA) was added to the tested soil samples in 1, 3, 6, 9, 12, 15 & 18 % by weight of samples. This study shows that once the tested soil mixed with (FA); the values of cohesion reduced; while the values of the angles of internal frictions increases. The drop in the soil sample cohesion when mixed with 18% of (FA) was 34%, were note

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Härtwig, Fabian, Lars Lorenz, Stefan Makowski, Matthias Krause, Carsten Habenicht, and Andrés Fabián Lasagni. "Low-Friction of ta-C Coatings Paired with Brass and Other Materials under Vacuum and Atmospheric Conditions." Materials 15, no. 7 (2022): 2534. http://dx.doi.org/10.3390/ma15072534.

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Vacuum environments provide challenging conditions for tribological systems. MoS2 is one of the materials commonly known to provide low friction for both ambient and vacuum conditions. However, it also exhibits poor wear resistance and low ability to withstand higher contact pressures. In search of wear-resistant alternatives, superhard hydrogen-free tetrahedral amorphous carbon coatings (ta-C) are explored in this study. Although known to have excellent friction and wear properties in ambient atmospheres, their vacuum performance is limited when self-paired and with steel. In this study, the

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Roshan, Alireza, Magdy Abdelrahman, and Mohyeldin Ragab. "Performance Evaluation of Highly Modified Asphalt-Based Binders in High Friction Surface Treatment: Comparative Study with Epoxy-Based System." Buildings 15, no. 9 (2025): 1425. https://doi.org/10.3390/buildings15091425.

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High Friction Surface Treatments (HFSTs) are frequently used to increase skid resistance and reduce collisions, particularly in crash-prone zones, including horizontal curves and intersections. Epoxy-based binders traditionally have been the sole option for HFSTs, but their drawbacks, such as high costs and compatibility challenges, have led to the search for substitute binders, including asphalt-based options. This study investigates the comparative performance of highly modified asphalt-based binders, including polymer-modified, mastic, and highly modified emulsions, in HFST applications usi

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Peng, Li, Zhan, Wang, and Yang. "Finite Element Method-Based Skid Resistance Simulation Using In-Situ 3D Pavement Surface Texture and Friction Data." Materials 12, no. 23 (2019): 3821. http://dx.doi.org/10.3390/ma12233821.

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Skid resistance is an important surface characteristic that influences roadway safety. Various studies have been performed to understand the interaction between pavement and tires through numerical simulation for skid resistance prediction. However, the friction parameters required for simulation inputs are generally determined by objective assumptions. This paper develops a finite element method (FEM)-based skid resistance simulation framework using in-situ 3D pavement surface texture and skid resistance data. A 3D areal pavement model is reconstructed from high resolution asphalt pavement su

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Mazur, Jacek, Monika Wójcik, Renata Różyło, Paweł Sobczak, Marian Panasiewicz, and Sławomir Obidziński. "Frictional Properties of Soaps with the Addition of Ground Hazelnut Shells." Materials 17, no. 12 (2024): 2966. http://dx.doi.org/10.3390/ma17122966.

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The search for new technologies and related new biological materials for use in the cosmetics industry requires many studies and analyses of not only chemical but also physical properties. This study attempts to assess the properties of soap produced with the addition of crushed hazelnut shells. This additive is intended to improve the friction properties of the soap, which in turn enhances the quality of removing impurities from the skin. Friction tests for wet and dry skin were performed on an appropriately designed measuring station using the Texture Analyser XT plus device. The obtained re

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Mistakidis, E. S., and P. D. Panagiotopoulos. "The search for substationarity points in the unilateral contact problems with nonmonotone friction." Mathematical and Computer Modelling 28, no. 4-8 (1998): 341–58. http://dx.doi.org/10.1016/s0895-7177(98)00126-5.

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Frens, M. A., and J. N. Van der Geest. "Scleral Search Coils Influence Saccade Dynamics." Journal of Neurophysiology 88, no. 2 (2002): 692–98. http://dx.doi.org/10.1152/jn.00457.2001.

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The scleral search coil technique is commonly used for recording eye movements. The goal of this paper is to investigate to what extent the placement of scleral search coils onto the eyes influences the kinematics of saccades. To that end saccadic eye movements of human subjects were recorded with an infrared video system, while they wore coils and we compared the main sequence properties with recordings in which no coils were mounted on the eyes. It was found that saccades last longer (by about 8%) and become slower (by about 5%) when both eyes wear coils. This is truly due to the fact that t

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Skorynina, P. A., A. V. Makarov, V. V. Berezovskaya, E. A. Merkushkin, and N. M. Chekan. "THE INFLUENCE OF NANOSTRUCTURING FRICTION TREATMENT ON MICROMECHANICAL AND CORROSIVE CHARACTERISTICS OF STABLE AUSTENITIC CHROMIUM-NICKEL STEEL." Frontier materials & technologies, no. 4 (2021): 80–88. http://dx.doi.org/10.18323/2782-4039-2021-4-80-88.

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Friction treatment is an effective method to increase the strength and wear resistance of austenitic chromium-nickel steels. Previously, the authors identified that the high level of mechanical properties of metastable austenitic steels is achieved at the intensive development of deformation γ→α'-transformation. However, the presence of deformation martensite in the austenitic steel structure can negatively affect its anti-corrosion properties. The search for ways to improve the strength characteristics of stable austenitic chromium-nickel steel while maintaining high resistance to corrosion d

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KAŁUŻNY, Jarosław, Jerzy MERKISZ, Aleksander STEPANENKO, et al. "Piston assembly in the most powerful 2.0l diesel engine – case study of the current tribological system and innovative concepts for the future." Combustion Engines 171, no. 4 (2017): 127–33. http://dx.doi.org/10.19206/ce2017-421.

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This article is a contribution to the ongoing debate on the scenario of the vehicle powertrains development. The directions of the internal combustion engines development in search of the possibility of effective economic and ecological indicators improvement have been indicated. It has been pointed out that this goal can be achieved through the use of nanotechnology in order to exceed the downsizing barriers resulting from the permissible mechanical loads for conventional materials. The article presents the study of the construction and materials used in the piston assembly of the most advanc

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Ciavarella, Michele, and Antonio Papangelo. "SOME SIMPLE RESULTS ON THE MULTISCALE VISCOELASTIC FRICTION." Facta Universitatis, Series: Mechanical Engineering 17, no. 2 (2019): 191. http://dx.doi.org/10.22190/fume190215025c.

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The coefficient of friction due to bulk viscoelastic losses corresponding to multiscale roughness can be computed with Persson's theory. In the search for a more complete understanding of the parametric dependence of the friction coefficient, we show asymptotic results at low or large speed for a generalized Maxwell viscoelastic material, or for a material showing power law storage and loss factors at low frequencies. The ascending branch of friction coefficient at low speeds highly depends on the rms slope of the surface roughness (and hence on the large wave vector cutoff), and on the ratio

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Beroun, Stanislav, Pavel Brabec, Ondřej Dráb, and Robert Voženílek. "Influence of the Mean Friction Pressure on the Temperatures of the Combustion Engine." Applied Mechanics and Materials 390 (August 2013): 350–54. http://dx.doi.org/10.4028/www.scientific.net/amm.390.350.

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The development of a new combustion engines is connected with endeavor for escalation of the total efficiency. Escalation of the total efficiency can be: minimization of the mechanical losses in the combustion engines or minimization of the unsuitable equipment capacity of accessories. Now research and development programs of a manufacturer of the combustion engines search effectual equipment and method for this escalation of the total efficiency. The escalation of the total efficiency is important for a minimization fuel consumption and consequently for lower emissions. The paper deals with t

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Despard, Erin. "Photographic social media, designed landscapes and urban, place-based visibilities: in search of friction." Journal of Aesthetics & Culture 7, no. 1 (2015): 28242. http://dx.doi.org/10.3402/jac.v7.28242.

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Lu, Yongzhong, Danping Yan, and David Levy. "Friction coefficient estimation in servo systems using neural dynamic programming inspired particle swarm search." Applied Intelligence 43, no. 1 (2015): 1–14. http://dx.doi.org/10.1007/s10489-014-0621-2.

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Kersten, Mik, and Gail C. Murphy. "Reducing Friction for Knowledge Workers with Task Context." AI Magazine 36, no. 2 (2015): 33–41. http://dx.doi.org/10.1609/aimag.v36i2.2581.

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Knowledge workers perform work on many tasks per day and often switch between tasks. When performing work on a task, a knowledge worker must typically search, navigate and dig through file systems, documents and emails, all of which introduce friction into the flow of work. This friction can be reduced, and productivity improved, by capturing and modeling the context of a knowledge worker’s task based on how the knowledge worker interacts with an information space. Captured task contexts can be used to facilitate switching between tasks, to focus a user interface on just the information needed

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Lu, Lianshan, and Dong Li. "Determination of Wall Friction Velocity of the Turbulent Boundary Layer by Two-Parameter Nonlinear Curve Fitting." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 38, no. 2 (2020): 253–60. http://dx.doi.org/10.1051/jnwpu/20203820253.

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Hot-wire anemometer is a fundamental tool for flow field measurement, and has been widely adopted in research of turbulent flow. A turbulent boundary layer was generated by a trip wire and a piece of sandpaper in the low-speed wind tunnel, and the time-averaged velocity profiles at three different streamwise stations in the boundary layer were measured with IFA-300 constant temperature anemometer. Targeting the dimensionless velocity profile model White Law of the turbulent boundary layer, a nonlinear curve fitting MATLAB program for two parameters, which were theoretical original point of wal

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Ghate, Chetan, and Debojyoti Mazumder. "Employment targeting in a frictional labor market." Indian Growth and Development Review 12, no. 2 (2019): 242–62. http://dx.doi.org/10.1108/igdr-06-2018-0065.

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Purpose Governments in both developing and developed economies play an active role in labor markets in the form of providing both formal public sector jobs and employment through public workfare programs. The authors refer to this as employment targeting. The purpose of the paper is to consider different labor market effects of employment targeting in a stylized model of a developing economy. In the context of a simple search and matching friction model, the authors show that the propensity for the public sector to target more employment can increase the unemployment rate in the economy and le

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Shankar, S., M. Manikandan, and G. Raja. "Evaluation of tribological properties of Ceiba pentandra (kapok) seed oil as an alternative lubricant." Industrial Lubrication and Tribology 70, no. 3 (2018): 506–11. http://dx.doi.org/10.1108/ilt-04-2017-0103.

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Purpose The decrease in availability of mineral oils and their environmental hazards created the need to search for alternate bio-based oils. The aim of this study is to investigate the friction and wear characteristics of kapok (Ceiba pentandra) oil as a bio-lubricant. Design/methodology/approach The wear and friction characteristics between steel-steel contact under lubrication were found using a pin-on-disk tribometer under different loads and sliding speeds, respectively. The corrosion and oxidation stability of the test lubricants were also analyzed. The worn surfaces of the specimen are

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Pinevich, Elena, Yuriy Lazarev, Nikolay Bolgarov, Dmitry Altynov, and Yuri Fatyushin. "Mathematical model of the influence of the rheology of lubricating compositions on the safety of rolling stock movement." Journal of Physics: Conference Series 2131, no. 2 (2021): 022021. http://dx.doi.org/10.1088/1742-6596/2131/2/022021.

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Abstract The article deals with the search for rational and balanced solutions to ensure maximum safety of rolling stock movement, taking into account the minimization of costs and technical measures. The paper presents a mathematical model for calculating the effect of rheological characteristics of lubricants on the service life of heavy-loaded friction units of rolling stock. The scheme of interaction of a wheel with a rail at a single-point contact is presented in the form of contacts of two cylinders of infinite length. The results of numerical analysis of the found analytical dependences

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Petrov, E. P., and D. J. Ewins. "Analytical Formulation of Friction Interface Elements for Analysis of Nonlinear Multi-Harmonic Vibrations of Bladed Disks." Journal of Turbomachinery 125, no. 2 (2003): 364–71. http://dx.doi.org/10.1115/1.1539868.

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An analytical formulation for the vectors of contact forces and the stiffness matrix of the nonlinear friction contact interface is developed for the analysis of multi-harmonic vibrations in the frequency domain. The contact interface elements provided here an exact description of friction and unilateral contact forces at the interacting surfaces, taking into account the influence of the variable normal load on the friction forces, including the extreme cases of separation of the two surfaces. Initial gaps and interferences at the contact nodes, which affect the normal force, as well as the un

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