scholarly journals INVESTIGATION OF ROLLING AND SLIDING FRICTION FORCES

2020 ◽  
Vol 2020 (1) ◽  
pp. 228-228
Author(s):  
Natal'ya Scherbina ◽  
Evgeniya Sergacheva
Keyword(s):  
Sliding Friction ◽  
Friction Forces

The influence of the angle of inclination of the plane along which the sliding and rolling of rubber washers with different weights is carried out on the theoretical and practical length of movements of these objects is considered

scholarly journals Analytical substantiation of constructive parameters of rotating field board of plow’s body

2019 ◽  
Vol 126 ◽  
pp. 00038
Author(s):  
Vladimir Konovalov ◽  
Sergey Konovalov ◽  
Victoria Igumnova
Keyword(s):  
Sliding Friction ◽  
Rolling Friction ◽  
High Energy ◽  
Cultivated Plants ◽  
Friction Forces ◽  
Technical Parameters ◽  
Cutting Resistance ◽  
Different Depths ◽  
Analytical Relations ◽  
Rotating Field

The article shows importance of use of dump plowing for formation and maintenance of soil structure and pest control and diseases of cultivated plants. A significant drawback of plowing process is indicated, which is its high energy intensity. To reduce energy consumption, it is proposed to use rotating field boards, which allow replacing sliding friction forces with rolling friction forces. The article presents a description of design of plow’s body with rotating field board and notes that without a preliminary analytical study and justification of initial parameters, their use may not be effective. Analytical relations connecting value of radius of rotating field of board, rate of collapse of soil, allowable value of indentation of field board into soil and specific force of cutting resistance of soil that ability to use it for baseline technical parameters. To analyze obtained dependence, the article presents its graphical solution. The authors obtained an expression for determining the value of arm’s force of reference reaction from soil to balance a plow’s body, in addition, this indicator can be used to adjust a body when working on soils with different physical and mechanical parameters and at different depths.

Experimental Study of Friction in a Pneumatic Actuator at Constant Velocity

1993 ◽  
Vol 115 (3) ◽  
pp. 575-577 ◽  
Author(s):  
Lee E. Schroeder ◽  
Rajendra Singh
Keyword(s):  
Experimental Study ◽  
Experimental Method ◽  
Friction Force ◽  
Constant Velocity ◽  
Sliding Friction ◽  
Pneumatic Actuator ◽  
Friction Forces ◽  
Friction Models ◽  
Semi Empirical ◽  
Force Data

This paper describes an experimental method of determining sliding friction forces in a pneumatic actuator. Several empirical and semi-empirical friction models are evaluated using measured friction force data. A repeatability study is also performed to qualitatively assess friction randomness and a change in friction regimes.

Intelligent Modeling of Contact Mechanics and Friction Dynamics

2005 ◽  
Author(s):  
R. Marumo
Keyword(s):  
Contact Mechanics ◽  
Dynamic Models ◽  
Sliding Friction ◽  
Dynamic Modelling ◽  
Contact Friction ◽  
Friction Forces ◽  
Intelligent Modeling ◽  
Adhesion Contact ◽  
Frictional Forces ◽  
Friction Dynamics

This paper considers the investigations into adhesion, contact mechanics metal erosion effects, wear and tare as a result of the effects of frictional forces. Mechanical components rely on friction for the transformation and delivery of energy from point A to point B. This requires the knowledge of combined energies as well as their associated dynamic models and ancillary parameters. Adhesion, contact, friction and wear are major problems limiting both the fabrication yield and lifetime of any devices. Since it is the area of real contact, which determines the sliding friction, adhesion interaction may strongly affect the friction force even when no adhesion can be detected in a pull-off experiment. Therefore a good scientific dynamic modelling of friction forces is a prerequisite for the understanding and monitoring of friction adverse effect on mechanical systems for good maintenance purposes.

scholarly journals Experimental Estimation of Wear Resistance of Polyamide Composites, Reinforced By Carbon and Glass Fibres Used in Metal-Polymer Gearings

2020 ◽  
Vol 14 (4) ◽  
pp. 206-210
Author(s):  
Myron Chernets ◽  
Myroslav Kindrachuk ◽  
Anatolii Kornienko ◽  
Alina Yurchuk
Keyword(s):  
Mathematical Model ◽  
Wear Resistance ◽  
Sliding Friction ◽  
Characteristic Functions ◽  
Model Parameters ◽  
Linear Wear ◽  
Wear Model ◽  
Friction Forces ◽  
Material Wear ◽  
Metal Polymer

Abstract The method of model triboexperimental studies to determine the basic mathematical model parameters of materials wear resistance at sliding friction is considered. The quantitative relative experimental characteristics of wear resistance of glass fibre and carbon fibre reinforced polyamide used in metal-polymer gear couple have been determined. Wear resistance functions of these functional polymeric composites have been established as the basic ones in the tribokinetic mathematical model of material wear for sliding friction conditions. Also, according to the conducted researches, wear resistance diagrams were constructed. They may be used as graphical indicators of wear resistance in the required range of specific friction forces. The dependences that connect the characteristic functions of wear resistance of these materials (obtained by the developed mathematical tribokinetic wear model) with linear wear and gearing service life are presented.

scholarly journals THE GRINDING MECHANISM ON A KNIFE CENTRIFUGAL GRINDING MACHINE

2020 ◽  
pp. 485-492
Author(s):  
Ivan Andreyevich Voronin ◽  
Yuriy Davidovich Alashkevich ◽  
Viktor Anatol'yevich Kozhukhov
Keyword(s):  
Mechanical Characteristics ◽  
Sliding Friction ◽  
Rolling Friction ◽  
Friction Forces ◽  
Inertial Body ◽  
Grinding Mechanism ◽  
Working Bodies ◽  
Grinding Machine ◽  
Fibrous Suspension ◽  
Physical And Mechanical Characteristics

The article presents a methodology for calculating the force effect on a fibrous suspension of working bodies in a centrifugal grinding apparatus. The aim of the research is to calculate the force per tooth of an inertial body at different speeds of rotation of the rotor, to determine the effect of the circumferential speed of movement of inertial bodies on the grinding process of fibrous semi-finished products. The article discusses the mechanism of grinding on a centrifugal knife grinding apparatus, determines the tangential shear forces at the contact of the grinding satellite knives with the grinding bowl knives, determines the effect on the fiber of rolling friction forces and sliding friction forces when the grinding satellite knives come into contact with the grinding bowl knives, as well as the effect of specific pressure at the point of contact of the satellite knives with the grinding bowl knives under the influence of inertial forces. Based on the research results, it is scientifically substantiated that the forces arising at the minimum of the considered values of the rotation speed of inertial bodies are sufficient to break the fiber when using this installation for grinding fibrous semi-finished products. An increase in the speed of rotation of the satellites causes a positive change in the physical and mechanical characteristics of the finished castings.

Measurements and Interpretations of Sliding Wear Damage in Metals

1985 ◽  
Vol 107 (4) ◽  
pp. 483-490 ◽  
Author(s):  
P. J. Blau
Keyword(s):  
Sliding Wear ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Sliding Contacts ◽  
Friction Forces ◽  
Wear Damage ◽  
Microstructural Deformation

Research on sliding friction and wear of metals has involved studies of subsurface microstructural deformation. This paper considers the difficulties of measuring deformation and analyzing the implications of such studies on several bases: (1) defining the physical extent of sliding-induced deformation, (2) making appropriate measurements of deformation for complex tribological conditions, and (3) correlating microstructural wear damage with the measurable friction forces on sliding contacts. Data for unlubricated block-on-ring tests of Cu and 1020 steel on 4619 steel are used to demonstrate limitations and correlations possible with metallographic studies in tribology.

Mechanics and Sliding Friction in Belt Drives With Pulley Grooves

2005 ◽  
Vol 128 (2) ◽  
pp. 494-502 ◽  
Author(s):  
Lingyuan Kong ◽  
Robert G. Parker
Keyword(s):  
System Analysis ◽  
Sliding Friction ◽  
General Purpose ◽  
Computational Technique ◽  
Belt Drive ◽  
Friction Forces ◽  
Belt Drives ◽  
Contact Points ◽  
Torque Loss ◽  
Axially Moving

The steady mechanics of a two-pulley belt drive system are examined where the pulley grooves, belt extension and wedging in the grooves, and the associated friction are considered. The belt is modeled as an axially moving string with the tangential and normal accelerations incorporated. The pulley grooves generate two-dimensional radial and tangential friction forces whose undetermined direction depends on the relative speed between belt and pulley along the contact arc. Different from single-pulley analyses, the entry and exit points between the belt spans and pulleys must be determined in the analysis due to the belt radial penetration into the pulley grooves and the coupling of the driver and driven pulley solutions. A new computational technique is developed to find the steady mechanics of a V-belt drive. This allows system analysis, such as speed/torque loss and maximum tension ratio. The governing boundary value problem (BVP) with undetermined boundaries is converted to a fixed boundary form solvable by a general-purpose BVP solver. Compared to flat belt drives or models that neglect radial friction, significant differences in the steady belt-pulley mechanics arise in terms of belt radial penetration, free span contact points, tension, friction, and speed variations.

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