Radial Clearance is Key Factor Affecting Roller Bearing Life Prediction in Tri-Cone Bit

2008 ◽  
Vol 44-46 ◽  
pp. 233-238
Author(s):  
Chang Gen Bu
Keyword(s):  
Heat Treatment ◽  
Mathematical Model ◽  
Contact Stress ◽  
Life Prediction ◽  
Friction Pair ◽  
Roller Bearing ◽  
Radial Clearance ◽  
Bearing Life ◽  
Key Factor

The life of tri-cone bits will directly affect the economic and technical drilling target. In order to control and evaluate bit’s life, the paper builds up the calculating mathematical model, which is suitable for determination of tri-cone bit’s life, to rationally design the radial clearance of non standard bearings. Effect of the radial clearance on the life of roller bearing was systematically deduced. The larger the radial clearance is; the higher the contact stress is; and the shorter the roller bearing life is. It follows from the model that the key factor of the radial clearance should be taken into consideration besides structure data and anti-friction pair’s heat treatment of roller bearing in order to decrease the contact stress of anti-friction pair and prolong the bit’s life.

scholarly journals Run-out based crossed roller bearing life prediction by utilization of accelerated testing approach and FE numerical models

2017 ◽  
Vol 130 ◽  
pp. 99-110 ◽  
Author(s):  
Luca Quagliato ◽  
Dongwook Kim ◽  
Nara Lee ◽  
Soyoung Hwang ◽  
Joseph Domblesky ◽  
...  
Keyword(s):  
Life Prediction ◽  
Numerical Models ◽  
Roller Bearing ◽  
Accelerated Testing ◽  
Bearing Life ◽  
Testing Approach

Cold extrusion of conical cups with cylindrical cavity

2016 ◽  
Vol 1 (1) ◽  
pp. 8-14 ◽  
Author(s):  
Н. Коробова ◽  
N. Korobova ◽  
А. Дмитриев ◽  
A. Dmitriev ◽  
Н. Толмачев ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Mathematical Model ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Cold Extrusion ◽  
Extrusion Force ◽  
Low Carbon ◽  
Cylindrical Punch ◽  
The Mathematical Model

The method and results of the study of reverse extrusion of billet by cylindrical punch in a conical expanding matrix are described. The mathematical model, which we developed for the determination of specific extrusion force, is described too. The study by statistical method verified the adequacy of the model. This model made possible to assess the resistance of punches and showed the ability to produce deformation of a billet made of low carbon steel without heating. The developed process includes the operation of segmenting of the cylindrical workpieces from bar, heat treatment, lubrication and extrusion of the workpieces. The two-way cold extrusion of a billet is produced in a matrix alternatively by two punches. The design of the stamp is described. The stamp is specialized for reverse extrusion of a billet. In its construction the moving mechanism of action of the two alternately punches in one matrix is used.

Analysis of Interaction Peculiarities in the System “OUTSIDER – PHYSICAL PROTECTION SYSTEM” for Nuclear Facility

2015 ◽  
Vol 1084 ◽  
pp. 609-612
Author(s):  
Alexey Godovykh ◽  
Margarita Parepko ◽  
Boris Stepanov
Keyword(s):  
Mathematical Model ◽  
Conflict Resolution ◽  
Conflict Situation ◽  
Nuclear Facility ◽  
Physical Protection ◽  
The Real ◽  
Protection Systems ◽  
Key Factor ◽  
Physical Laws

The paper presents an approach to evaluating the effectiveness of physical protection systems (PPS). Considering the fact that different processes are subject to universal physical laws and principles of development, a parallel was drawn between the concepts of conflict resolution field to description of interaction in the system “outsider – PPS”. The description of mathematical model in the form of dependence with respect to the real conflict in the system “outsider – PPS” is given. The result of the model analysis is determination of the parameter, allowing estimating the rate of threat increase in conflict situation. Also competence of PPS operator is considered in the framework of the work. Furthermore, actions of operator were taken as a key factor affecting the efficiency of the whole security system. To resolve identified issues ways to develop special qualities required for the operator and their professional skills through training were suggested. Also the issues of control of psychophysiological characteristics of PPS staff were addressed.

Determination of Rolling Contact Stress Distribution by X-ray Diffraction

1989 ◽  
Vol 33 ◽  
pp. 341-352
Author(s):  
David L. Milan
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Contact Stress ◽  
Rolling Direction ◽  
Roller Bearing ◽  
Rolling Contact ◽  
Outer Race ◽  
Contact Stress Distribution ◽  
Inner Race

AbstractAn investigation was conducted of the potential for detection of the contact stress distribution in tapered roller bearing components made of carburized steel. Various raceway stress distributions were created by control of the profile and alignment of the rolling surfaces. Determination of residual stress in the rolling direction and peak breadth were made using a multiple tilt sin2 ψ technique. The measurements were made at the surface and at depths below the surface. It was found that the distribution of residual stress and peak breadth perpendicular to the rolling direction in the layers below the surface of the inner race correlated highly with the imposed contact stress distribution. The correlation was less in the case of the outer race. The residual stress distribution measured on the surface of the inner race was observed to be inversely proportional to the contact stress distribution.

Nonlinear analysis of cylindrical roller bearing under the influence of defect on individual and coupled inner–outer race

2018 ◽  
Vol 233 (2) ◽  
pp. 404-428 ◽  
Author(s):  
Sachin P Patel ◽  
S H Upadhyay
Keyword(s):  
Mathematical Model ◽  
Axial Load ◽  
Roller Bearing ◽  
Equation Of Motion ◽  
Radial Clearance ◽  
Normal Loading ◽  
Peak Displacement ◽  
Outer Race ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

In this paper, new mathematical model has been developed for the cylindrical roller bearing by considering coupled influence of radial deflection due to normal loading, roller titling, roller skewing, radial clearance, and also individual as well as coupled inner and outer race defects. Novel defect function is also developed for inner and outer race defects based on literature, to make a set of nonlinear equations for mathematical model, which are solved by using MATLAB. Newmark-β method is applied to solve the equation of motion. The results are plotted in time domain, velocity-displacement, and envelope analysis. The obtained results show the sensitiveness of the system with the variations in speed for the inner, outer, and combined inner–outer race defects. The peak displacement, velocity, and acceleration have been observed for various defects which are helpful to obtain the system’s dynamic behavior under speed varying condition for combined radial and axial load. A major finding of this paper is regarding the understanding of the system’s behavior like periodic to chaotic under varying speed conditions with the attention of individual and coupled inner and outer race defects with the inclusion of normal loading, tilting, skewing, and radial clearance effect and validation of simulated results with the calculated one.

Overview of the Methods for Service Life Prediction on Gears

2011 ◽  
Vol 488-489 ◽  
pp. 727-730
Author(s):  
Boris Aberšek ◽  
Jože Flašker
Keyword(s):  
Mathematical Model ◽  
Service Life ◽  
Crack Propagation ◽  
Life Prediction ◽  
Complex Structure ◽  
Almost All ◽  
The Mathematical Model ◽  
Multiaxial Loadings ◽  
Real Complex

For designing machines and devices the dimensioning with respect to service life is increasingly taken into account. This applies also for gearing which are still today one of very important components of almost all machines. The problem of determination of the service life of gearing is directly related to geometry of gears, multiaxial loadings, materials and appropriate models for prediction of the crack propagation. Obviously gears and gearing belong to the real complex structure, by correctly selected and carefully planned experiments we obtained results with which we can confirm and justified the mathematical model for calculating different parameters, i.e. service life.

DETERMINATION OF PERFORMANCE INDICATORS OF THE TRUCK KrAZ-6510TE

2020 ◽  
pp. 19-26
Author(s):  
Olexandr Pavlenko ◽  
Serhii Dun ◽  
Maksym Skliar
Keyword(s):  
Mathematical Model ◽  
Surface Friction ◽  
Building Structures ◽  
Maximum Torque ◽  
Military Equipment ◽  
Military Vehicles ◽  
Force Magnitude ◽  
Vehicle Mobility ◽  
The Mathematical Model

In any economy there is a need for the bulky goods transportation which cannot be divided into smaller parts. Such cargoes include building structures, elements of industrial equipment, tracked or wheeled construction and agricultural machinery, heavy armored military vehicles. In any case, tractor-semitrailer should provide fast delivery of goods with minimal fuel consumption. In order to guarantee the goods delivery, tractor-semitrailers must be able to overcome the existing roads broken grade and be capable to tow a semi-trailer in off-road conditions. These properties are especially important for military equipment transportation. The important factor that determines a tractor-semitrailer mobility is its gradeability. The purpose of this work is to improve a tractor-semitrailer mobility with tractor units manufactured at PJSC “AutoKrAZ” by increasing the tractor-semitrailer gradeability. The customer requirements for a new tractor are determined by the maximizing the grade to 18°. The analysis of the characteristics of modern tractor-semitrailers for heavy haulage has shown that the highest rate of this grade is 16.7°. The factors determining the limiting gradeability value were analyzed, based on the tractor-semitrailer with a KrAZ-6510TE tractor and a semi-trailer with a full weight of 80 t. It has been developed a mathematical model to investigate the tractor and semi-trailer axles vertical reactions distribution on the tractor-semitrailer friction performances. The mathematical model has allowed to calculate the gradeability value that the tractor-semitrailer can overcome in case of wheels and road surface friction value and the tractive force magnitude from the engine. The mathematical model adequacy was confirmed by comparing the calculations results with the data of factory tests. The analysis showed that on a dry road the KrAZ-6510TE tractor with a 80 t gross weight semitrailer is capable to climb a gradient of 14,35 ° with its coupling mass full use condition. The engine's maximum torque allows the tractor-semitrailer to overcome a gradient of 10.45° It has been determined the ways to improve the design of the KrAZ-6510TE tractor to increase its gradeability. Keywords: tractor, tractor-semitrailer vehicle mobility, tractor-semitrailer vehicle gradeability.

Sign in / Sign up

Export Citation Format

Share Document