Готові списки джерел за темами / Moment of frictional forces

Добірка наукової літератури з теми "Moment of frictional forces"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Moment of frictional forces"

1

Choi, D. H., and W. Hwang. "Measurement of Frictional Forces in Atomic Force Microscopy." Solid State Phenomena 121-123 (March 2007): 851–54. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.851.

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Анотація:
A new calibration method of frictional forces in atomic force microscopy (AFM) is suggested. An angle conversion factor is defined using the relationship between torsional angle and frictional signal. When the factor is measured, the slopes of the torsional angle and the frictional signal as a function of the normal force are used to eliminate the effect of the adhesive force. Moment balance equations on the flat surface and the top edge of a commercial step grating are used to obtain the angle conversion factor. After the factor is obtained from an AFM system, it can be applied to all cantilevers without additional experiments.
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2

Salaani, Mohamed Kamel. "Analytical Tire Forces and Moments with Physical Parameters2." Tire Science and Technology 36, no. 1 (March 1, 2008): 3–42. http://dx.doi.org/10.2346/1.2804130.

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Анотація:
Abstract The pneumatic tire behaves as a highly nonlinear system. Its complexity has limited the development of a complete and reasonable theory governing its mechanics. Practical tire models used in vehicle dynamics simulation and tire-related research rely basically on curve-fitted experimental data and empirical adjustments of theoretical models. This paper introduces a validated analytical model based on the physical properties of the tire by formulating the shear contact phenomena with elliptical normal pressure distribution and planar stress-strain laws. Adjustments are introduced to current methods for estimating distributed stiffness, the use of friction, and the forces saturation phenomena. The analytical model is formulated and normalized to accept tire physical parameters that are easily estimated from force and moments measurements. These parameters are universal to all tires: lateral and longitudinal stiffnesses, aligning pneumatic trail, overturning effective moment arm, and frictional properties. The method of using fundamental mechanics for modeling contact patch forces and moments with tire physical parameters constitutes a significant advancement. The tire model is validated with experimental data.
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3

Liu, Zhao, Antoine Hinaut, Stefan Peeters, Sebastian Scherb, Ernst Meyer, Maria Clelia Righi, and Thilo Glatzel. "2D KBr/Graphene Heterostructures—Influence on Work Function and Friction." Nanomaterials 12, no. 6 (March 15, 2022): 968. http://dx.doi.org/10.3390/nano12060968.

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Анотація:
The intercalation of graphene is an effective approach to modify the electronic properties of two-dimensional heterostructures for attractive phenomena and applications. In this work, we characterize the growth and surface properties of ionic KBr layers altered by graphene using ultra-high vacuum atomic force microscopy at room temperature. We observed a strong rippling of the KBr islands on Ir(111), which is induced by a specific layer reconstruction but disappears when graphene is introduced in between. The latter causes a consistent change in both the work function and the frictional forces measured by Kelvin probe force microscopy and frictional force microscopy, respectively. Systematic density functional theory calculations of the different systems show that the change in work function is induced by the formation of a surface dipole moment while the friction force is dominated by adhesion forces.
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4

Fazeli, Nima, Roman Kolbert, Russ Tedrake, and Alberto Rodriguez. "Parameter and contact force estimation of planar rigid-bodies undergoing frictional contact." International Journal of Robotics Research 36, no. 13-14 (April 1, 2017): 1437–54. http://dx.doi.org/10.1177/0278364917698749.

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Анотація:
This paper addresses the identification of the inertial parameters and the contact forces associated with objects making and breaking frictional contact with the environment. Our goal is to explore under what conditions, and to what degree, the observation of physical interaction, in the form of motions and/or applied external forces, is indicative of the underlying dynamics that governs it. In this study we consider the cases of passive interaction, where an object free-falls under gravity, and active interaction, where known external perturbations act on an object at contact. We assume that both object and environment are planar and rigid, and exploit the well-known complementarity formulation for contact resolution to establish a constrained optimization-based problem to estimate inertial parameters and contact forces. We also show that when contact modes are known, or guessed, the formulation provides a closed-form relationship between inertial parameters, contact forces, and observed motions, that turns into a least squares problem. Consistent with intuition, the analysis indicates that without the application of known external forces, the identifiable set of parameters remains coupled, i.e. the ratio of mass moment of inertia to mass and the ratio of contact forces to the mass. Interestingly the analysis also shows that known external forces can lead to decoupling and identifiability of mass, mass moment of inertia, and normal and tangential contact forces. We evaluate the proposed algorithms both in simulation and with real experiments for the cases of a free falling square, ellipse, and rimless wheel interacting with the ground, as well as a disk interacting with a manipulator.
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5

Bilaloglu, Seda, Ying Lu, Daniel Geller, John Ross Rizzo, Viswanath Aluru, Esther P. Gardner, and Preeti Raghavan. "Effect of blocking tactile information from the fingertips on adaptation and execution of grip forces to friction at the grasping surface." Journal of Neurophysiology 115, no. 3 (March 1, 2016): 1122–31. http://dx.doi.org/10.1152/jn.00639.2015.

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Анотація:
Adaptation of fingertip forces to friction at the grasping surface is necessary to prevent use of inadequate or excessive grip forces. In the current study we investigated the effect of blocking tactile information from the fingertips noninvasively on the adaptation and efficiency of grip forces to surface friction during precision grasp. Ten neurologically intact subjects grasped and lifted an instrumented grip device with 18 different frictional surfaces under three conditions: with bare hands or with a thin layer of plastic (Tegaderm) or an additional layer of foam affixed to the fingertips. The coefficient of friction at the finger-object interface of each surface was obtained for each subject with bare hands and Tegaderm by measuring the slip ratio (grip force/load force) at the moment of slip. We found that the foam layer reduced sensibility for two-point discrimination and pressure sensitivity at the fingertips, but Tegaderm did not. However, Tegaderm reduced static, but not dynamic, tactile discrimination. Adaptation of fingertip grip forces to surface friction measured by the rate of change of peak grip force, and grip force efficiency measured by the grip-load force ratio at lift, showed a proportional relationship with bare hands but were impaired with Tegaderm and foam. Activation of muscles engaged in precision grip also varied with the frictional surface with bare hands but not with Tegaderm and foam. The results suggest that sensitivity for static tactile discrimination is necessary for feedforward and feedback control of grip forces and for adaptive modulation of muscle activity during precision grasp.
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6

Spector, A. A., and R. C. Batra. "Rolling/Sliding of a Vibrating Elastic Body on an Elastic Substrate." Journal of Tribology 118, no. 1 (January 1, 1996): 147–52. http://dx.doi.org/10.1115/1.2837070.

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Анотація:
The rolling/sliding in the presence of friction of a vibrating elastic body on an elastic substrate is studied. It is shown that the longitudinal components of the velocity of the center of mass of the body and of the resultant frictional force are not affected by the vibration process. However, the normal vibration of the body influences the slip velocities and the distribution of frictional forces. For the problem of a harmonically oscillating long cylinder rolling/sliding on the flat surface of an elastic substrate, the time histories of the width of the contact zone and the length of adhesion subzone are computed. It is shown that the local frictional forces and slip velocities oscillate, and that the set of admissible values of the external frictional forces and moments providing the rolling/sliding regime is smaller under conditions of normal vibrations than that when the cylinder does not vibrate.
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7

Cawley, Patrick W., Robert S. Heidt, Pierce E. Scranton, Gary M. Losse, and Mark E. Howard. "Physiologic Axial Load, Frictional Resistance, and the Football Shoe—Surface Interface." Foot & Ankle International 24, no. 7 (July 2003): 551–56. http://dx.doi.org/10.1177/107110070302400705.

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Анотація:
The purpose of this investigation was to report on the interaction between different types of athletic shoes and playing surfaces using physiologic loads of 40 and 220 lbs. This is a continuation of our previous report using a load of 25 lbs. Nine shoes by three manufacturers were characterized as turf, court, molded cleat, or traditional cleat and tested on both natural grass and synthetic turf. A specially designed pneumatic testing device was used in order to measure translational resistance and rotational torque of the shoe-surface interface. Measurements were acquired for 1) force-X describing translational loading, 2) moment-Y describing the torque generated by linear translation, and 3) moment-Z describing the moment generated by axial rotation, and data were analyzed using repeated measures analysis of variance and Tukey's post-hoc comparison. It was found that increased the axial loads from 40 to 220 lbs significantly increased the frictional resistance ( p < .05) between the shoe and the artificial turf surface in a nonlinear fashion. Turf shoes demonstrated the most frictional resistance of any group for this condition. Increases in the forces generated in linear translation from the axial load of 40 to 220 lbs produced the most significant increases of any resistance test on the turf surface. The cleated shoes (both traditional and molded) generated the highest frictional and torsional resistance on the grass surface when compared to the other categories of shoes. Grass generated higher peak moments than turf for the cleated shoes. These results demonstrate the considerable differences between laboratory and physiologic conditions and that the increase in frictional resistance is nonlinear with increasing loads.
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8

Bechtel, S. E., S. Vohra, K. I. Jacob, and C. D. Carlson. "The Stretching and Slipping of Belts and Fibers on Pulleys." Journal of Applied Mechanics 67, no. 1 (September 28, 1999): 197–206. http://dx.doi.org/10.1115/1.321164.

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Анотація:
We derive the equations of motion for an extensible belt on a pulley in which all effects of inertia, including (for the first time) acceleration due to stretching, are retained in the momentum balance. These equations are also valid for fibers and films on rollers undergoing cold draw. We apply our equations to the problem of torque transmission by a belt between two pulleys, and compare the resulting solution to solutions in which centrifugal acceleration is included but stretching acceleration is neglected (the common engineering practice), and the solution in which both centrifugal and stretching accelerations are neglected. We find that ignoring both centrifugal and stretching accelerations results in an overprediction of the maximum moment that can be transmitted, and, for a given transmitted moment, underprediction of the slip angles on the driving and driven pulleys and overprediction of belt strain rates and normal and frictional forces from the pulley on the belt in the slip zones. The common engineering practice of including the effects of centrifugal acceleration but neglecting stretching acceleration also results in errors, for example underpredicting the maximum moment that can be transmitted, overpredicting the slip angles, and underpredicting belt strain rates and normal and frictional forces on the driving pulley. The percentage error increases as the ratios of belt stiffness to centrifugal acceleration or initial belt tension decrease. [S0021-8936(00)01401-X]
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9

Hyeung-Sik, Choi. "Modeling of robot manipulators working under the sea and the design of a robust controller." Robotica 14, no. 2 (March 1996): 213–18. http://dx.doi.org/10.1017/s0263574700019123.

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Анотація:
SUMMARYThis paper presents a study of the dynamics of undersea robot manipulators in an unstructured sea water environment and a control scheme appropriate for manipulating them. Under the sea, the buoyancy and the added mass should be considered in modeling the dynamics of the robot manipulators. However, due to the complexity of the modeling of the added mass, the dynamics of the robot manipulators are treated as an unmodeled dynamics in this paper. In addition to the buoyancy and added mass/moment of inertia, disturbing forces due to drag, and current affecting the dynamics of the robot manipulators should be considered. In this paper, the forces due to the drag are defined as disturbance forces in addition to the frictional force of manipulator joints. In order to control the manipulator, a robust control scheme is devised to achieve trajectory tracking while regulating disturbance forces. A numerical example is shown.
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10

Kozak, F. V., S. I. Krystopa, L. I. Krystopa, and Y. M. Arsenych. "IMPROVING OF EFFICIENCY OF BAND-BLOCK BRAKE WORK BY REDUCING OF DYNAMIC AND THERMAL LOADINGS." PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY Number, no. 2(46) (December 26, 2018): 218–25. http://dx.doi.org/10.31471/2304-7399-2018-2(46)-218-225.

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Анотація:
This article is devoted to theoretical and experimental research of loading of new multi-pair friction units of band-block brakes of drilling hoists of drill units in stand conditions.Mathematical dependencies are made to determine frictional forces, efforts of tensions of incident and matching branches of the tape and the brake moments developed by the internal and external friction pairs. On the basis of dynamic and thermal loading of the latter, rational structural parameters of the brake were determined.
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Більше джерел

Дисертації з теми "Moment of frictional forces"

1

Gan, Aik Ben. "The effect of frictional and thermal forces upon sea bed pipeline buckling behaviour." Thesis, Sheffield Hallam University, 1985. http://shura.shu.ac.uk/19217/.

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Анотація:
The objective of the research programme has been to develop design parameters applicable to in-service submarine pipeline buckling behaviour. The programme has involved experimental and theoretical studies and computer graphics are widely employed throughout. Initially, as detailed in Chapter 1, the necessary buckling mechanisms in. pipelines subjected to axial compression have been identified and analysed in the form of relatively basic fully mobilised studies. In addition, errors and limitations contained within these studies have been determined and delineated. Consequently, geotechnical experimentation as reported in Chapter 2 was deemed necessary particularly given the dearth of information available relating to the nature of the friction resistance force between the pipeline and its supporting medium. Full scale values for the axial and lateral friction coefficients together with their respective fully mobilised displacements have been deduced upon the basis of model tests. A semi-empirical formula has thereby been produced for use in design practice. Further, a novel interpretation of sea bed recovery, or the pipeline's submerged self-weight inertial characteristics associated with vertical buckling, has also been determined. Following on from the above geotechnical study,more refined quasi-idealised analyses,dealt with in Chapter 3, have been undertaken incorporating the appropriate full scale deformation-dependent axial and lateral friction-response loci together with the respective sea bed recovery characteristics. These analyses enable, for the first time, definition of the appropriate critical temperature rise at which axial-flexural bifurcation occurs. Finally, noting that previous buckling analyses have been based on quasi-idealised buckling phenomena, attempts have also been made to incorporate practical submarine pipeline imperfections. Pipelines are not perfectly straight in field conditions and, consequently, the imperfection studies denoted in Chapter 4 have attempted to model the appropriate behaviour. Design charts have been produced accordingly and suggestions made regarding further studies.
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2

Wood, Peter Edwin. "An investigation of contact forces, flow, pressure, hysteresis and frictional effects in brush seals." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393118.

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3

Разаві, Сейед Фаршад. "Гідродинамічні особливості потока аномально-в'язких рідин у конічної поверхні ковзання". Doctoral thesis, Київ, 2019. https://ela.kpi.ua/handle/123456789/29180.

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Анотація:
Дисертаційна робота присвячена дослідженню впливу гідродинаміки в'язких і аномально в'язких мастильних матеріалів у конічних зазорах зі змінною величиною конусності. Подібні завдання є актуальними при дослідженні конічних опорних підшипників, які знайшли широке застосування в гідротурбінобудуванні та інших сферах гідромашинобудування. Одним з важливих питань у даному напрямку є визначення крутного моменту сил в'язкого тертя в щілинних конічних зазорах. В роботі, проведено критичний аналіз досліджень, присвячених даній темі, зроблено висновок про недостатність досліджень і поставлена задача, розв’язання якої пропонується в даній роботі. На підставі досліджень інших авторів виведені основні критерії подібності, які можуть охарактеризувати цей процес поведінки рідини в зазорі, де одна з поверхонь (внутрішня) може обертатися навколо своєї осі. Проведено фізичне і математичне моделювання поведінки рідини в конічних підшипниках. На підставі експериментальних досліджень були отримані функціональні залежності визначення крутного моменту як функції частоти обертання внутрішнього конуса, в'язкості змащує рідини, ширини щілинного зазору між конічними поверхнями. Отримані результати були зіставлені з аналогічними даними для циліндричних щілинних зазорів (циліндричних підшипників ковзання). Представлені рекомендації по розрахунку основних характеристик потоку. Проведення математичне моделювання дало можливість оцінити ступінь відмінності між результатами експерименту і теорії, пояснити розбіжності в результатах. Одним з найважливіших моментів дослідження є результат, пов'язаний з поведінкою аномально-в'язких рідин (деякі з мастильних матеріалів за своєю поведінкою близькі до рідин, поведінка яких можна описати рівнянням Освальда де Віля). Проведене моделювання процесів, що розглядаються в конічних щілинних зазорах, дало можливість забезпечити раціональний вибір змащувальних матеріалів для зниження моменту тертя (сил тертя) в конічних зазорах.
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4

Christman, Benjamin M. "Evaluation of frictional forces between brackets of different types at various angulations and an arch wire: With and without pulsating vibration." Thesis, NSUWorks, 2015. https://nsuworks.nova.edu/hpd_cdm_stuetd/61.

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Анотація:
Objective: The objective of this study was to determine the effect of pulsating vibration on the sliding resistance between orthodontic brackets and stainless steel wires. Brackets were placed at two different angulations (0° and 5°) to simulate leveling of a tipped tooth during tooth movement. Pulsating vibration was delivered via the AcceleDent device. Background: Friction is defined as a force that retards or resists the relative motion of two objects in contact, and its direction is tangential to the common boundary of the two surfaces in contact. This has been of interest to the orthodontist since the mid-20th century. Since the time of Stoner’s paper in 1960, the orthodontic literature has been full of studies done on friction in orthodontics including: friction with different ligation methods, friction among different arch wire materials, friction and different bracket materials, and friction with various slot designs. Understanding friction has led to the emergence of new technologies in orthodontics. One of the most popular is the self-ligating bracket. This popularity arose from claims that they reduce friction during treatment. Other innovations have been introduced in the field of orthodontics to help accelerate tooth movement. Among these innovations is the application of a pulsating vibration during active orthodontic treatment. Such pulsating vibration can be delivered during orthodontic treatment by AcceleDent, which is a hands- free device designed by OrthoAccel Technologies, Inc., Bellaire, TX. The company claims the output force helps accelerate bone turnover. The following study investigated whether it could decrease treatment time via a different mechanism: decreasing frictional resistance to tooth movement along the arch wire. Methods: A paper template was made of a typodont tooth with a bracket window cut out. The bracket cut out was made with the bracket window angulated 0° and 5°. 0.022” x 0.028” standard prescription edgewise brackets (American Orthodontics, Sheboygan, WI) of ceramic, twin and self-ligating design were bonded to 3 maxillary 1st premolar typodont teeth using the template. The teeth were leveled with a 0.019” x 0.025” SS arch wire and placed in a metal scaffold. They were held in place with Aquasil Ultra XLV wash material PVS (DENTSPLY Caulk, Milford, DE.). Only the middle bracket was adjusted for angulation and accuracy was checked with the iPhone 6 level. The AcceleDent Aura device (OrthoAccel Technologies, Inc., Bellaire, TX). was attached to the occlusal surface of the teeth via cable ties. The AcceleDent Aura device provided 30 Hz of pulsating vibration. All tests were performed with a 0.019” x 0.025” SS arch wire pulled through the brackets via a Universal Testing Machine (Instron, Grove City, PA) at a crosshead speed of 2.5mm/min for 30 seconds. Frictional resistance was measured by averaging 6 recordings every 5 seconds. Results: The pulsating vibration provided by the AcceleDent device significantly reduced the resistance to sliding for each bracket type at both 0° and 5° (p<0.05). Ceramic brackets had the highest resistance to sliding of all bracket types. Conclusions: Pulsating vibration via the AcceleDent Aura device reduces the resistance to sliding between a bracket and arch wire in vitro. This may potentially decrease overall treatment time but more in vivo studies need to be done to evaluate this.
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5

Lim, keng gein. "P-delta Effects on a Steel Moment Frame Subjected to Sidesway Forces Caused by Unsymmetrical Live Load Patterns." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1622.

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Анотація:
Symmetrical steel moment frames that are subjected to sidesway forces due to unsymmetrical live loads will undergo sidesway. The P-delta effects on a moment frame under the influence of sidesway forces is studied. The effective length method is used for the second-order analysis specified in the American Institute Steel Construction - Load and Resistance Factor Design (AISC-LRFD). This study investigates the P-delta effects on a multi-story, multi-bay steel moment frame subjected to sidesway forces caused by various unsymmetrical live load patterns. The study focuses on the interaction of axial and bending moment in the columns. The actual response of a moment frame is estimated by amplifying the results of a first-order elastic analysis using moment magnification factors. The moment magnification factors for each story of the steel moment frame are summarized.
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6

Koukal, Milan. "Mechanická analýza vlivu výrobních odchylek na styk hlavice a jamky totální endoprotézy kyčelního kloubu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233902.

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Анотація:
In endoprosthesis surgery there are typically a high percentage of implant defects, these can lead to failure of the whole prosthesis. One type of total hip replacement function loss is acetabular cup loosening from the pelvic bone. This disertation examines manufacture perturbations as one of the possible reasons for this kind of failure. Both dimension and geometry manufacturing perturbations of ceramic head and polyethylen cup were analyzed. We find that perturbations in the variables analysed here affect considered values of contact pressure and frictional moment. Furthermore, contact pressure and frictional moment are quantities affecting replacement success and durability. From obtained results it can be recommended to fit head and cup with a clearance of between 0 mm and 0.05 mm. It can not be recommend using interference type of fit because of strong deterioration of the contact conditions. Roundness perturbation of ceramic head should not exceed 0.025 mm.
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7

Pashak, Riley. "Susceptibility to Ankle Sprain Injury between Dominant and Non-Dominant Leg During Jump Landings." UKnowledge, 2019. https://uknowledge.uky.edu/khp_etds/66.

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Анотація:
Ankle sprains are one of the most common injuries within athletics in the United States with approximately one-million student athletes experiencing ankle sprains each year. Studies argue excessive or rapid ankle inversion occurring from jump landings may cause ankle sprains. Also, the effect of limb dominance on risk of ankle sprain is not well documented. The aim of this study was to determine if there is an affect of leg dominance on landing mechanism of the ankle joint that predisposes either ankle joint to greater risk of ankle sprain. Twelve recreationally active subjects were recruited and completed four maximal vertical jumps. Ground reaction force, marker position data and maximal vertical jump height were collected using two Bertec Force plates, a 10-camera motion capture system, and a Vertec Vertical Jump Trainer, respectively. Cortex and Visual3D software programs were used to process the motion capture data and to calculate peak vertical ground reaction forces(vGRF), loading rate, and ankle joint moments. There were no statistically significant differences in ankle joint moment or loading rate between limbs, but peak vGRF were significantly higher (p < 0.05) in the non-dominant ankle. The results suggest the non-dominant ankle displays higher injury potential, as the non-dominant leg accumulates a larger peak landing force.
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8

Roy, Adam. "Music in Motion: A Metaphoric Mapping of Forces in Piano Concertos by Mozart and Schumann." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33009.

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Анотація:
In this thesis, I demonstrate the dynamic way in which musical processes can be described as metaphors. Using Steve Larson’s three main metaphors (gravity, inertia, and magnetism) as a starting point, I propose additional metaphors (friction, repulsion, momentum, wave, orbit, and oscillation) to analyze the first movements of Mozart’s Piano Concerto No. 20 in D minor, K 466 and Schumann’s Piano Concerto in A minor, op. 54. These metaphors provide a means to discuss points of convergence and divergence between the Classical style and the early-Romantic style. Additionally, most theorists of the energeticist tradition only discuss motion through prose; I introduce a way to represent these metaphors as musical examples. By focusing on the listener’s experience through musical motion, the model proposed in this thesis is useful, not only for the theorist, but for all who wish to communicate ideas about music in a dynamic way.
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9

Buell, Grant. "Comparison of structural steel lateral force resisting systems for a theoretical hospital grid system." Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/2321.

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Metelues, Francis Gabriel. "The Knee Response during Squats with Heels Up and Down." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1388574269.

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Книги з теми "Moment of frictional forces"

1

Thom, Françoise. Le moment Gorbatchev. Paris: Hachette, 1991.

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2

Thom, Françoise. Le moment Gorbatchev. Paris: Hachette, 1989.

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3

Kemp, Darrel W. A comparitive analysis of frictional forces between self-ligating and conventional Edgewise orthodontic brackets. [Toronto: Faculty of Dentistry, University of Toronto], 1992.

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4

Andrew, Lubin, and Stephens Media (Firm), eds. Saluting American valor: Selfless courage at the moment of truth. Las Vegas, Nev: Stephens Press, 2010.

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5

Peltokorpi, Kaisa-Maria. On elettävä kun koska tahansa voi kuolla: Lottien selviytyminen sodassa 1939-1945 = You have to live for the moment because any moment may be your last one -- how did lottas survive at war in 1939-1945? Rovaniemi: Lapin yliopisto, 2011.

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6

Maki, B. E. Influence of handrail shape, size and surface texture on the ability of young and elderly users to generate stabilizing forces and moment. Ottawa: Editiorial Office, Division of Electrical Engineering,National Research Council of Canada, 1988.

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7

Payne, Andrew Howard. The hinged moment at the feet in human movement: A study of the lean-back, braking forces and the hinged momentin human movement using a purpose-built platform system. Birmingham: University of Birmingham, 1985.

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8

Financial Management: Audit of the White House Commission on the National Moment of Remembrance for fiscal years 2003 and 2002. Washington, D.C: The Office, 2004.

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9

Nekrasov, Stanislav. Social dialectics of prehistory. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1078147.

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Анотація:
The author of the monograph, written on the original material, restores the classical scientific social philosophy, which allows the means of dialectical methodology and materialism in sociology to predict the end of the prehistory of antagonistic epochs and the beginning of the true history of a single humanity. The new industrialization at the moment of transition from prehistory to history creates civilizational neo-industrialism as a dialectical synthesis of traditional civilization and progressive formation in the form of new socialism. The global project of neo-industrialism civilizes humanity — saves it from barbarism, wars, social inequality, and the destruction of nature. In historical Russia, civilizing development is realized at the expense of new industrialization and the solution of general democratic tasks with the transition to post-capitalist tasks. Conceptually, civilizational neo-industrialism acts as the fifth world theory, which makes it possible to understand the future of the dialectic of new social forces in the transition from prehistory to history. It is of interest to postgraduates, researchers and a wide range of readers in order to determine the worldview position, clarify the philosophical base of science and search for scientists, understand the dialectics of social existence and social consciousness.
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Office, General Accounting. Financial management: Profile of Navy and Marine Corps financial managers : report to the Acting Assistant Secretary of the Navy (Financial Management and Comptroller). Washington, D.C. (P.O. Box 37050, Washington, D.C. 20013): The Office, 1998.

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Частини книг з теми "Moment of frictional forces"

1

Eliseev, Alexander A., Tatiana A. Kalashnikova, Andrey V. Filippov, and Evgeny A. Kolubaev. "Material Transfer by Friction Stir Processing." In Springer Tracts in Mechanical Engineering, 169–88. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_8.

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AbstractMechanical surface hardening processes have long been of interest to science and technology. Today, surface modification technologies have reached a new level. One of them is friction stir processing that refines the grain structure of the material to a submicrocrystalline state. Previously, the severe plastic deformation occurring during processing was mainly described from the standpoint of temperature and deformation, because the process is primarily thermomechanical. Modeling of friction stir welding and processing predicted well the heat generation in a quasi-liquid medium. However, the friction stir process takes place in the solid phase, and therefore the mass transfer issues remained unresolved. The present work develops the concept of adhesive-cohesive mass transfer during which the rotating tool entrains the material due to adhesion, builds up a transfer layer due to cohesion, and then leaves it behind. Thus, the transfer layer thickness is a clear criterion for the mass transfer effectiveness. Here we investigate the effect of the load on the transfer layer and analyze it from the viewpoint of the friction coefficient and heat generation. It is shown that the transfer layer thickness increases with increasing load, reaches a maximum, and then decreases. In so doing, the average moment on the tool and the temperature constantly grow, while the friction coefficient decreases. This means that the mass transfer cannot be fully described in terms of temperature and strain. The given load dependence of the transfer layer thickness is explained by an increase in the cohesion forces with increasing load, and then by a decrease in cohesion due to material overheating. The maximum transfer layer thickness is equal to the feed to rotation rate ratio and is observed at the axial load that causes a stress close to the yield point of the material. Additional plasticization of the material resulting from the acoustoplastic effect induced by ultrasonic treatment slightly reduces the transfer layer thickness, but has almost no effect on the moment, friction coefficient, and temperature. The surface roughness of the processed material is found to have a similar load dependence.
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Mills, Kenneth C., and Carl-Åke Däcker. "Slag Infiltration, Lubrication and Frictional Forces." In The Casting Powders Book, 19–58. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53616-3_2.

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Chien, C. H., L. C. Chang, and H. J. Tzeng. "The Effects of Frictional Forces in Bending Cables." In Computational Mechanics ’88, 959–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-61381-4_249.

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4

Choi, D. H., and W. Hwang. "Measurement of Frictional Forces in Atomic Force Microscopy." In Solid State Phenomena, 851–54. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-30-2.851.

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5

Jong, Siaw Chian, Dominic Ek Leong Ong, Erwin Oh, and Chung Siung Choo. "Prediction of Frictional Jacking Forces Using Bayesian Inference." In Challenges and Innovations in Geomechanics, 878–85. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64514-4_95.

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6

Pethica, J. B., and A. P. Sutton. "Nanomechanics: — Atomic Resolution and Frictional Energy Dissipation in Atomic Force Microscopy." In Forces in Scanning Probe Methods, 353–66. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0049-6_33.

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7

Daikhin, L. I., and M. Urbakh. "Effect of Electrostatic Interactions on Frictional Forces in Electrolytes." In Fundamentals of Tribology and Bridging the Gap Between the Macro- and Micro/Nanoscales, 199–214. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0736-8_13.

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Abu-Saba, Elias G. "Influence of Axial Forces on Plastic Moment." In Design of Steel Structures, 340–49. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-2079-5_12.

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9

Overney, R. M., H. Takano, M. Fujihira, G. Overney, W. Paulus, and H. Ringsdorf. "Molecular Scale Study of Domain Boundaries and Frictional Stick-Slip Motion on Lipid Bilayers." In Forces in Scanning Probe Methods, 307–12. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0049-6_26.

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10

Iancu, Vasile, and Lenuta Cindea. "About the Forces and Moments that Influence the Behavior of a Friction Pendulum." In Springer Proceedings in Physics, 515–22. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54136-1_52.

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Тези доповідей конференцій з теми "Moment of frictional forces"

1

Fakhari, Amin, Mehdi Keshmiri, and Mohammad Keshmiri. "Dynamic Modeling and Slippage Analysis in Object Manipulation by Soft Fingers." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38498.

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In this paper, dynamic modeling and slippage analysis of a three-link soft finger manipulating a rigid object on a horizontal surface is studied. In order to integrate the dynamics of soft tip with the finger linkage, power-law model and a linear viscous damper are used to model the elastic behavior and damping effect of soft tip respectively. Because of the enlarged contact area in the soft contact, a frictional moment can be exerted at the contact interface along with the normal and tangential forces. Furthermore, because of planar motion of object, frictional forces and moment are applied in the contact of object and ground. Therefore, friction limit surface is used as a mapping between contact forces/moment and sliding motions in both contacts. Instead of using equality and inequality equations of frictional contact conditions, a method is proposed to describe different states of the contact forces and moment by a single second-order differential equation with variable coefficients. This kind of formulation of the system dynamics facilitates the design of a controller to cancel the undesired slippage occurs between the soft tip and object during the manipulation.
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2

Larochelle, Pierre, and J. M. McCarthy. "Static Analysis of Spherical nR Kinematic Chains With Joint Friction." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0377.

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Abstract This paper presents the static analysis of general spherical nR simple open or closed kinematic chains with joint friction. The internal loading on each link is found to consist of a bending moment and a torsional moment. The goal of this analysis is to determine these moments which are then used in designing the link. The moment and force balance equations for each link yields a linear system of equations which define the internal moments of the mechanism and the output torque on the driven crank for a given input torque. A Coulomb model of joint friction is used to determine the friction torque along the axis of a joint. The joint friction model requires an iterative solution. The purpose of this algorithm is to provide a means of computing the complete internal and external loading on the members of spherical chains while including frictional effects in order to facilitate the design of a functional spherical mechanisms.
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3

Veiga, José Carlos, and Nelson Kavanagh. "Evaluation of the Reaction Moments of Metal Bellows Expansion Joints Subjected to Angular Movement." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65382.

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The reaction moment calculations of Hinged and Gimbal expansion joints, designed according to the “Standards of Expansion Joint Manufacturers Association” (EJMA), consider the bellows spring rate and pin friction. The reaction moment due to the lateral pressure forces should also be considered. Metal bellows subjected to angular movement extends one side and contracts the opposite, generating a lateral force caused by the media pressure. This paper evaluates the lateral force reaction moment in a hinged expansion joint with the hardware designed for angular movements. For this purpose prototypes were built and the moments evaluated, simulating actual field conditions.
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4

Gofron, Marian. "Twisting Moment of a Non-Rolling Tire." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1207.

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Abstract The steering system is a key element in the determination of vehicle performance. The steering force of a vehicle depends upon the steering system geometry and the interaction between the tires and the ground. Maximum steering force usually occurs when the vehicle is not moving and an attempt is made to steer the wheels lock to lock. During the process of designing a steering system, the steering force is often determined by laboratory experiments or simple calculations. This paper presents formulas that can be used to determine tire-twisting moment when the tire is not rotating. The formula considers the elastic and the frictional effect of the tire, the effect of steering direction, and footprint size on the tire twisting moment. A computer program utilizing these formulas can be written to determine the steering force for any steering linkage member for a stationary vehicle.
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5

Sharf, Inna, and Yuning Zhang. "A Contact Force Solution for Non-Colliding Contact Dynamics Simulation." In ASME 2006 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/detc2006-99139.

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Rigid-body impact modeling remains an intensive area of research spurred on by new applications in robotics, biomechanics, and more generally multibody systems. By contrast, the modeling of non-colliding contact dynamics has attracted significantly less attention. The existing approaches to solve non-colliding contact problems include compliant approaches in which the contact force between objects is defined explicitly as a function of local deformation, and complementarity formulations in which unilateral constraints are employed to compute contact interactions (impulses or forces) to enforce the impenetrability of the contacting objects. In this article, the authors develop a novel approach to solve the non-colliding contact problem for objects of arbitrary geometry in contact at multiple points. Similarly to the complementarity formulation, the solution is based on rigid-body dynamics and enforces contact kinematics constraints at the acceleration level. Differently, it leads to an explicit closed-form solution for the normal forces at the contact points. Integral to the proposed formulation is the treatment of tangential contact forces, in particular the static friction. These friction forces must be calculated as a function of microslip velocity or displacement at the contact point. Numerical results are presented for three test cases: 1) a thin rod sliding down a stationary wedge; 2) a cube rotating off the stationary wedge under application of an external moment and 3) the cube and the wedge both moving under application of a moment. To ascertain validity and correctness, the solutions to frictionless and frictional scenarios obtained with the proposed formulation are compared to those generated by using a commercial simulation tool MSC ADAMS.
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6

Malafeev, S. I., A. I. Kopeykin, and S. S. Malafeev. "INVESTIGATION OF THE CHARACTERISTICS OF FRICTION PAIRS IN THE OSCILLATION REGIME: THE METHOD AND IMPLEMEN-TATION OF THE MECHATRONIC OSCILLATORY SYSTEM." In BALTTRIB. Aleksandras Stulginskis University, 2017. http://dx.doi.org/10.15544/balttrib.2017.24.

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An oscillatory method for identifying the characteristics of friction pairs of drive systems is considered. It is based on the use of mechatronic systems with a controlled "electric spring" and allows us to investigate dissipative characteristics in the regime of forced steady oscillations in the operating frequency range, with low laboriousness and high accuracy. The mechatronic oscillatory system is realized on the basis of a synchronous electric machine with permanent magnets on the rotor and a control system for the oscillation regime. The peculiarity of the method and the technical means realized on its basis is that the determination of the moment of frictional forces occurs not in the static state of the system, but under conditions close to the operational ones, i.e. with continuous motion by changing the direction of motion.
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7

Sepehri, A., and K. Farhang. "Contact Moment and Friction Force in Elastic Contact of Two Rough Surfaces." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44458.

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It is reasonable to expect that when two nominally flat rough surfaces are brought into contact by an applied resultant force, they must support, in addition to the compressive load, an induced moment. The existence of a net applied moment would imply non-even distribution of contact force so that there are more asperities in contact over one region of the nominal area. In this paper we consider the contact between two rectangular rough surfaces that provide normal and tangential contact force as well as contact moment to counteract the net moment imposed by the applied forces. The surfaces are permitted to develop slight angular misalignment and through this contact moment is derived. Through this scheme it is possible to also define elastic contribution to friction since the half-plane tangential contact force on one side of an asperity is no longer balanced by the half-plane tangential force component on the opposite side. The elastic friction force however is shown to be of a much smaller order than the contact normal force.
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8

Gunelsu, Ozgur, and Ozgen Akalin. "Development of a Piston Secondary Motion Model for Skirt Friction Analysis." In ASME 2012 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icef2012-92166.

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A comprehensive piston skirt lubrication and secondary motion model that can be used for piston friction simulations was developed based on Greenwood and Tripp’s surface asperity contact model and Patir and Cheng’s modified Reynolds equation with surface flow factors. Oil flow between the skirt-liner clearances was modeled and hydrodynamic and asperity contact pressures around the skirt were calculated. Reynolds boundary conditions were applied to determine the film rupture boundaries and wetted areas. Surface roughness and roughness orientation were included in the model. Due to its important effect on pressure development in the oil film, change in the skirt profile due to elastic deformations was taken into account. Change of the skirt profile due to piston thermal expansion is also calculated using the steady-state temperature distribution of the piston corresponding to the investigated engine running conditions. A piston stiffness matrix obtained by finite element analysis was used to determine the elastic deformations of the piston skirt under the calculated oil film pressures. A two-degree-of-freedom system is formed with the forces and moments calculated by the lubrication model. These forces and moments require a coupled solution with piston position. This is achieved by applying an iterative numerical procedure based on Broyden’s scheme which seeks force and moment balance at each iteration phase making use of time step variation. The effects of various engine operating conditions and piston design parameters on piston secondary motion were investigated. Piston skirt friction force due to hydrodynamic shear forces and metal-to-metal contact is calculated.
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9

Sepehri, A., and K. Farhang. "Moment and Friction Force in Three Dimensional Elastic Contact of Two Rectangular Rough Surfaces." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43615.

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Анотація:
It is reasonable to expect that when two nominally flat rough surfaces are brought into contact by an applied resultant force, they must support, in addition to the compressive load, an induced moment. The existence of a net applied moment would imply non-even distribution of contact force so that there are more asperities in contact over one region of the nominal area. In this paper we consider the contact between two rectangular rough surfaces that provide normal and tangential contact force as well as contact moment to counteract the net moment imposed by the applied forces. The surfaces are permitted to develop slight angular misalignment and through this contact moment is derived. Through this scheme it is possible to also define elastic contribution to friction since the half-plane tangential contact force on one side of an asperity is no longer balanced by the half-plane tangential force component on the opposite side. The elastic friction force however is shown to be of a much smaller order than the contact normal force.
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10

Sepehri, A., and K. Farhang. "Combined Force and Moment in a Three Dimensional Model of Elastic Contact of Nominally Flat Rough Surfaces." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-69079.

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Анотація:
In this paper we consider the contact between two rectangular rough surfaces that provide normal and tangential contact force as well as contact moment to counteract the net moment imposed by the applied forces. The surfaces are permitted to develop slight angular misalignment and thereby contact moment is derived. Through this scheme it is possible to also define elastic contribution to friction since the half-plane tangential contact force on one side of an asperity is no longer balanced by the half-plane tangential force component on the opposite side. The elastic friction force however is shown to be of a much smaller order than the contact normal force. Approximate closed form equations are found for contact force and moment as functions of separation, asperity radius of curvature sum, mean plane slope and nominal contact dimension. The approximate equations are shown to give error within seven percent.
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Звіти організацій з теми "Moment of frictional forces"

1

Rubin, Alex, Alan Omar Loera Martinez, Jake Dow, and Anna Puglisi. The Huawei Moment. Center for Security and Emerging Technology, July 2021. http://dx.doi.org/10.51593/20200079.

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Анотація:
For the first time, a Chinese company—Huawei—is set to lead the global transition from one key national security infrastructure technology to the next. How did Washington, at the beginning of the twenty-first century, fail to protect U.S. firms in this strategic technology and allow a geopolitical competitor to take a leadership position in a national security relevant critical infrastructure such as telecommunications? This policy brief highlights the characteristics of 5G development that China leveraged, exploited, and supported to take the lead in this key technology. The Huawei case study is in some ways the canary in the coal mine for emerging technologies and an illustration of what can happen to U.S. competitiveness when China’s companies do not have to base decisions on market forces.
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2

Winter, Charlie, Abdul Sayed, and Abdullah Alrhmoun. A “New” Islamic Emirate? The Taliban’s Outreach Strategy in the Aftermath of Kabul. RESOLVE Network, January 2022. http://dx.doi.org/10.37805/ogrr2022.1.afg.

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Анотація:
As the Taliban’s forces swept across Afghanistan in July and August, their triumphalist—and fundamentally revolutionary—discourse became exponentially more pronounced. The moment it seized Kabul, however, the Taliban had to reorder its communications priorities. As Afghanistan’s new de facto government, it needed to expand on what its outreach strategists had been doing to date, i.e., setting out political aspirations, emphasizing military capabilities, and attacking the legitimacy of adversaries. Now, it had to take on a more complex strategic communications task: demonstrating that its new state would be able to follow through on what as a movement it had been promising for decades. Drawing on tens of thousands of data points ingested by ExTrac’s automated crawlers from the Taliban’s online networks on Telegram and Twitter as well as an array of pro-Taliban static websites, this report examines how the fall of Kabul impacted the Taliban’s outreach strategy.
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