The geometric homogeneity of rollers, namely the dimension and shape deviations among rollers in a roller bearing, is one most important manufacturing errors. However, to best authors’ knowledge, no specified investigation has been carried out on effects friction torque tapered bearings (TRBs). By introducing diameter deviation distribution form with deviation, this study presents mathematic mo...

FOR some years we have been engaged on the problem of extracting enzymes from micro-organisms. It is well known that most bacteria and yeasts carry out oxidations and metabolic processes at a rate incomparably higher than that of animal tissues. The peculiar virtue of micro-organisms as the source of enzymes is therefore self-evident. A certain amount of success has been attained in extracting ...

Roller bearing failure is a major factor in failure of rotating machinery. As a fatal defect is detected, it is common to shut down the machinery as soon as possible to avoid catastrophic damages. Performing such an action, which usually occurs at inconvenient times, typically results in substantial time and economical losses. It is, therefore, important to monitor the condition of roller beari...

Abstract: Thin-walled integrated flexible support structures are the major trend in the development of current rolling bearing technology. A thin-walled, integrated, squirrel-cage flexible support roller bearing, quasi-dynamic iterative finite element analysis (FEA) model is established in this paper. The FEA model is used to calculate the structural deformation of the thin-wall rings and suppo...

In this article, the type of roller slip behavior that may result in formation white-etching cracks (WECs) wind turbine gearbox bearings is identified. A new hypothesis based on inner raceway normal contact load magnitude at time proposed as probable cause WECs. For purpose, maximum loads are identified when occurs high-speed shaft different mean speeds. Subsequently, annual probability occurre...

The roller bearing characteristic frequencies contain very little energy, and are usually overwhelmed by noise and higher levels of structural vibrations. Therefore, envelope spectrum analysis is widely used to detection bearing localized fault. In order to overcome the shortcomings in the traditional envelope analysis in which manually specifying a resonant frequency band is required, a new ap...