A SIMPLIFIED WAY OF ESTIMATING A DYNAMIC LOAD RATING FOR THRUST ROLLER BEARINGS

Tribologia ◽  
2020 ◽  
Vol 289 (1) ◽  
pp. 49-55
Author(s):  
Michał LIBERA
Keyword(s):  
Dynamic Load ◽  
Linear Interpolation ◽  
Load Rating ◽  
Rolling Bearings ◽  
Thrust Bearings ◽  
Bearing Angle ◽  
Speed Up ◽  
The Difference ◽  
Dynamic Load Rating ◽  
Selection Of

The method of calculating the bearing capacity of rolling bearings is described in the ISO 281 standard. The calculation procedure for roller thrust bearings presented there, depending on the value of the nominal bearing angle, requires the selection of one of two formulas. Then, using the table, one reads the value of the factor depending on the geometry of the bearing components. To facilitate and speed up calculations (and perhaps also increase their accuracy), this article proposes a formula that is adapted to numerical applications, replaces linear interpolation with a proper non-linear function and allows calculations to be made for a specific value of the nominal bearing angle, but not within the range of 15°. The difference between the values calculated according to the proposed formula and the value calculated according to ISO 281 is, on average, around 3%.

Re-Evaluation of Basic Dynamic Load Rating and Life Formula for a Ball Screw

2007 ◽  
Vol 50 (1) ◽  
pp. 88-95 ◽  
Author(s):  
Shigeo Shimizu ◽  
Hirokazu Shimoda ◽  
Chandra Shekhar Sharma
Keyword(s):  
Dynamic Load ◽  
Ball Screw ◽  
Load Rating ◽  
Dynamic Load Rating

Study on the Life Distribution and Reliability of Roller Based Linear Bearing

2007 ◽  
Author(s):  
Shigeo Shimizu ◽  
Hirokazu Shimoda ◽  
Katsuji Tosha
Keyword(s):  
Fatigue Life ◽  
Test Data ◽  
Dynamic Load ◽  
Distribution Functions ◽  
Load Rating ◽  
Life Test ◽  
Life Distribution ◽  
Dynamic Load Rating ◽  
Log Normal ◽  
Log Normal Distribution

A study on the life distribution and reliability for roller guides with cage is carried out with a total number of 90 test samples in two lots (Ns = 38 and 52), and fatigue life distribution functions, such as two and three parameters Weibull distribution, and log-normal distribution are used for analyzing the test data. The basic dynamic load rating formula standardized by ISO in 2004 is also compared with the life test data in relation to the effect of crowning on both ends of the carriage raceway. Weibull slope, compatibility of distribution functions and λbm factor are also examined.

Theoretical Reevaluation of Basic Dynamic Load Rating and Rating Life for Linear Bearings

2008 ◽  
Vol 51 (4) ◽  
pp. 460-468 ◽  
Author(s):  
Shigeo Shimizu ◽  
Hirokazu Shimoda ◽  
Chandra S. Sharma
Keyword(s):  
Dynamic Load ◽  
Load Rating ◽  
Dynamic Load Rating

Rolling Fatigue Life and Reliability of Ball Screws

2007 ◽  
Author(s):  
Hirokazu Shimoda ◽  
Shigeo Shimizu ◽  
Katsuji Tosha ◽  
Yushi Otani
Keyword(s):  
Fatigue Life ◽  
Weibull Distribution ◽  
Test Data ◽  
Dynamic Load ◽  
Ball Screw ◽  
Test Machine ◽  
Load Rating ◽  
Life Test ◽  
Dynamic Load Rating ◽  
Fatigue Life Test

The experimental formula based on Lundberg-Palmgren theory has been used for the calculation of basic dynamic load rating of ball screws because its contact state resembles that of angular contact ball bearings. However, the compatibility between the theoretical and the actual rating life of ball screws has not been yet confirmed by life tests and probability theory. The inherent properties of ball screws are also not considered in this formula. In this paper, the authors deal with the development of ball screw life test machine and fatigue life test for ball screws with a total number of 31 test samples. Type and occurrence location of the initial failure of each sample are investigated. The fatigue life test data are analyzed with two and three parameters Weibull distribution functions. The basic dynamic load rating of the ball screws are also estimated from the life test data. The results are summarized as follows: (1) Initial failures are generated at the surface of the balls and the nut raceway as a spalling. (2) The life distribution of the test data fairy well fits three parameters Weibull distribution function. (3) Basic dynamic load rating, which is estimated by the life test, is approximately in agreement with that of manufacturer’s catalog.

SERVICEABILITY-BASED DYNAMIC LOAD RATING OF A LT20 BRIDGE

2004 ◽  
Vol 28 (6) ◽  
pp. 33-36 ◽  
Author(s):  
P. Siswobusono ◽  
S.-E. Chen ◽  
S. Jones ◽  
D. Callahan ◽  
T. Grimes ◽  
...  
Keyword(s):  
Dynamic Load ◽  
Load Rating ◽  
Dynamic Load Rating

Basic dynamic load rating analysis of Clutch Release Bearings

2009 ◽  
Author(s):  
Alan Bueno Marques ◽  
Gustavo dos Santos Gioria ◽  
João Bosco Lourenço Pereira ◽  
Everton Cleto Domingues
Keyword(s):  
Dynamic Load ◽  
Load Rating ◽  
Dynamic Load Rating

COMBINATORIAL POLYNOMIALLY COMPUTABLE CHARACTERISTICS OF SUBSTITUTIONS AND THEIR PROPERTIES

2020 ◽  
Vol 7 (2) ◽  
pp. 34-41
Author(s):  
VLADIMIR NIKONOV ◽  
◽  
ANTON ZOBOV ◽  
Keyword(s):  
Mathematical Expectation ◽  
Point Of View ◽  
Small Range ◽  
Computational Point ◽  
Wide Range ◽  
Bijective Function ◽  
The Difference ◽  
Element Base ◽  
Selection Of

The construction and selection of a suitable bijective function, that is, substitution, is now becoming an important applied task, particularly for building block encryption systems. Many articles have suggested using different approaches to determining the quality of substitution, but most of them are highly computationally complex. The solution of this problem will significantly expand the range of methods for constructing and analyzing scheme in information protection systems. The purpose of research is to find easily measurable characteristics of substitutions, allowing to evaluate their quality, and also measures of the proximity of a particular substitutions to a random one, or its distance from it. For this purpose, several characteristics were proposed in this work: difference and polynomial, and their mathematical expectation was found, as well as variance for the difference characteristic. This allows us to make a conclusion about its quality by comparing the result of calculating the characteristic for a particular substitution with the calculated mathematical expectation. From a computational point of view, the thesises of the article are of exceptional interest due to the simplicity of the algorithm for quantifying the quality of bijective function substitutions. By its nature, the operation of calculating the difference characteristic carries out a simple summation of integer terms in a fixed and small range. Such an operation, both in the modern and in the prospective element base, is embedded in the logic of a wide range of functional elements, especially when implementing computational actions in the optical range, or on other carriers related to the field of nanotechnology.

Sign in / Sign up

Export Citation Format

Share Document