Signature Analysis of Roller Bearing Vibrations: Lubrication Effects

1992 ◽  
Vol 206 (3) ◽  
pp. 193-202 ◽  
Author(s):  
Y-T Su ◽  
Y-T Sheen ◽  
M-H Lin
Keyword(s):  
Roller Bearing ◽  
Vibration Energy ◽  
Running Speed ◽  
Oil Film ◽  
Spacing Distribution ◽  
Surface Irregularities ◽  
Vibration Signature ◽  
Bearing Assembly ◽  
Bearing Vibration ◽  
Lubricant Viscosity

This study investigates the vibration signature of roller bearings, induced by the surface irregularities of components, under various lubricating conditions. The bearing vibration is modelled as the output of the bearing assembly which is subjected to the excitations of surface irregularities through the oil-film. The oil-film acts as a spring between the roller and race. The stiffness of oil-film under different lubricating conditions is studied from the empirical equation of minimum oil-film thickness. It is shown that the vibration spectra of a normal roller bearing may have a pattern of equal frequency spacing distribution (EFSD) whose frequency information is similar to that of a damaged bearing. Under large loading and low running speed, the vibration energy is low if the lubricant viscosity is high. On the other hand, at high running speed, the vibration energy is high with high lubricant viscosity.

Oil Film Thickness in Lightly-Loaded Roller Bearings

1974 ◽  
Vol 16 (6) ◽  
pp. 386-390 ◽  
Author(s):  
H. Bahadoran ◽  
R. Gohar
Keyword(s):  
Film Thickness ◽  
Similar Condition ◽  
Thrust Bearing ◽  
Roller Bearing ◽  
Optical Interferometry ◽  
Oil Film ◽  
Roller Bearings ◽  
Tapered Roller

The effects of speed, load and roller geometry on the oil film thickness and shape in a complete roller bearing are demonstrated experimentally by means of optical interferometry. At quite moderate roller speeds, increase of film thickness becomes inhibited. This effect is attributed to a truncated inlet meniscus, a similar condition having been observed elsewhere with a ball-and-plate machine and with a model of a tapered-roller thrust bearing.

Evaluation of Tapered Roller Bearing Vibration Velocity as Data Series Using Grey System Theory

2012 ◽  
Vol 443-444 ◽  
pp. 97-104
Author(s):  
Xin Tao Xia ◽  
Wei Wei Man
Keyword(s):  
System Theory ◽  
Probability Distributions ◽  
Roller Bearing ◽  
Grey System Theory ◽  
Vibration Velocity ◽  
Data Series ◽  
Grey System ◽  
Tapered Roller Bearing ◽  
Tapered Roller ◽  
Bearing Vibration

With the help of the grey system theory and without any prior information on probability distributions and trends, this paper focus on modeling for the tapered roller bearing vibration velocity as a data series. And the experimental investigation shows that the estimated residual is very small and can satisfy the engineering requirement, laying the foundation for controlling over the vibration of tapered roller bearings in the manufacturing process.

scholarly journals Non-linear vibro-impact phenomenon belying transmission idle rattle

2008 ◽  
Vol 222 (10) ◽  
pp. 1909-1923 ◽  
Author(s):  
O Tangasawi ◽  
S Theodossiades ◽  
H Rahnejat ◽  
P Kelly
Keyword(s):  
Dynamic Model ◽  
Squeeze Film ◽  
Automotive Transmission ◽  
Lumped Parameter ◽  
Squeeze Film Effect ◽  
Vibration Signature ◽  
Impact Characteristics ◽  
Gear Rattle ◽  
Lubricant Viscosity ◽  
Transmission Gear

This paper investigates automotive transmission gear rattle. Specifically, idle gear rattle, where the repetitive impacts of teeth are subject to light loads is investigated. Hydrodynamic regime of lubrication prevails in lightly loaded impact of teeth pairs. Formation of a lubricant film is due to the combined entraining motion of the lubricant and squeeze film effect. A lumped parameter inertial dynamic model, comprising hydrodynamic impact and flank friction for pairs of simultaneous teeth pairs of loose gears is developed. The overall dynamic model includes seven loose gear pairs and rigid body lateral motions of input and output transmission shafts. Therefore, the influence of fluid film behaviour on idle gear rattle is determined, which has hitherto not attracted sufficient research studies. Gear rattle is manifested by a vibration signature, which corresponds to the bands of frequencies due to torsional engine oscillations, meshing frequencies, and impact characteristics of lubricated conjunctions. The spectral contributions are affected by lubricant rheology, specifically its bulk viscosity variation with temperature. It has been found that spectral disposition tends towards lower frequency contributions with reducing lubricant viscosity because of rising temperatures and lowering lubricant stiffness. The findings conform with the experimental results, also reported in the paper. It has also been shown that squeeze film motion plays a significant role in the propensity of transmission system to rattle.

Bearing Signature Analysis as a Medium for Fault Detection: A Review

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
M. S. Patil ◽  
Jose Mathew ◽  
P. K. RajendraKumar
Keyword(s):  
Fault Detection ◽  
Vibration Measurement ◽  
Signature Analysis ◽  
Rolling Element Bearings ◽  
Bearing Defects ◽  
Rolling Element ◽  
Vibration Signature ◽  
Recent Trends ◽  
Bearing Vibration ◽  
Detection And Diagnosis

Rolling element bearings find widespread domestic and industrial application. Defects in bearing unless detected in time may lead to malfunctioning of the machinery. Different methods are used for detection and diagnosis of the bearing defects. This paper is intended as a tutorial overview of bearing vibration signature analysis as a medium for fault detection. An explanation for the causes for the defects is discussed. Vibration measurement in both time domain and frequency domain is presented. Recent trends in research on the detection of the defects in bearings have been included.

Roller Bearing Fault Diagnosis Based on IMF Kurtosis and SVM

2013 ◽  
Vol 694-697 ◽  
pp. 1160-1166
Author(s):  
Ke Heng Zhu ◽  
Xi Geng Song ◽  
Dong Xin Xue
Keyword(s):  
Fault Diagnosis ◽  
Roller Bearing ◽  
Fault Classification ◽  
Support Vector ◽  
Bearing Fault ◽  
Bearing Fault Diagnosis ◽  
Mode Decomposition ◽  
Diagnosis Method ◽  
Bearing Vibration ◽  
The Imf

This paper presents a fault diagnosis method of roller bearings based on intrinsic mode function (IMF) kurtosis and support vector machine (SVM). In order to improve the performance of kurtosis under strong levels of background noise, the empirical mode decomposition (EMD) method is used to decompose the bearing vibration signals into a number of IMFs. The IMF kurtosis is then calculated because of its sensitivity of impulses caused by faults. Subsequently, the IMF kurtosis values are treated as fault feature vectors and input into SVM for fault classification. The experimental results show the effectiveness of the proposed approach in roller bearing fault diagnosis.

A Numerical Model for Oil Film Flow in an Aero-Engine Bearing Chamber and Comparison With Experimental Data

2004 ◽  
Author(s):  
Mark Farrall ◽  
Kathy Simmons ◽  
Stephen Hibberd ◽  
Philippe Gorse
Keyword(s):  
Experimental Data ◽  
Boundary Conditions ◽  
Roller Bearing ◽  
Numerical Approach ◽  
Oil Droplets ◽  
Two Phase ◽  
Oil Film ◽  
Aero Engine ◽  
The Impact ◽  
Engine Bearing

The work presented forms part of an on-going investigation, focusing on modelling the motion of a wall oil film present in a bearing chamber and comparison with existing experimental data. The film is generated through the impingement of oil droplets shed from a roller bearing. Momentum resulting from the impact of oil droplets, interfacial shear from the airflow, and gravity cause the film to migrate around the chamber. Oil and air exit the chamber at scavenge and vent ports. A previously reported numerical approach to the simulation of steady-state two-phase flow in a bearing chamber, that includes in-house sub-models for droplet-film interaction and oil film motion, has been extended. This paper includes the addition of boundary conditions for the vent and scavenge together with a comparison to experimental results obtained from ITS, University of Karlsruhe. The solution is found to be sensitive to the choice of boundary conditions applied to the vent and scavenge.

scholarly journals Comparative study of selected bearing vibration measuring systems

Mechanik ◽  
2018 ◽  
Vol 91 (7) ◽  
pp. 498-500 ◽  
Author(s):  
Stanisław Adamczak ◽  
Mateusz Wrzochal
Keyword(s):  
Comparative Study ◽  
Roller Bearing ◽  
Rolling Bearing ◽  
Vibration Monitoring ◽  
Monitoring Systems ◽  
Measuring Systems ◽  
Bearing Vibration ◽  
Vibration Measuring

Roller bearing manufacturers have individual bearing vibration monitoring systems, consisting of several key components. Despite the fact that the principle of operation of these systems is the same, they differ from each other with some constructional solutions, whereas the type of construction used has an impact on the accuracy of measuring vibrations of a rolling bearing.

scholarly journals Working in of roller ends and bars of cylindrical roller bearings at combined radial and axial loads

2021 ◽  
Vol 2094 (4) ◽  
pp. 042071
Author(s):  
I M Klebanov ◽  
V V Murashkin ◽  
M I Kondratev ◽  
I E Adeyanov ◽  
K A Polyakov
Keyword(s):  
Strain State ◽  
Roller Bearing ◽  
Axial Loads ◽  
Standard Size ◽  
Force Interaction ◽  
Oil Film ◽  
Roller Bearings ◽  
Bearing Rings ◽  
Yaw Angle ◽  
Cylindrical Roller

Abstract The paper investigates the influence of the process of running-in the ends of rollers and sides of cylindrical roller bearings on the conditions of hydrodynamic contact of these parts: the formation of an oil film and friction. For this purpose, the results of finite element modeling of the stress-strain state of the bearing parts in contact: the inner ring, the side flange and a fragment of the axle of the wheelset, and the multi-mass simulation of the dynamics of the bearing operation are used. The influence of the yaw angle of the roller on the size and shape of the contact area on the side is investigated. The dependences for calculating the thickness of the oil film in the contact between the ends of the rollers and the flanges of the bearing rings are being refined, which now make it possible to take into account the misaligned position of these parts during their force interaction. The results are illustrated using the example of a roller bearing of standard size 232926.

Vibration Monitoring and Damage Quantification of Ball Bearings for Household Appliances

2005 ◽  
Author(s):  
F. K. Choy ◽  
D. Konrad ◽  
E. Labus ◽  
R. Wu
Keyword(s):  
Vibration Monitoring ◽  
Ball Bearings ◽  
Household Appliances ◽  
Rejection Level ◽  
Bearing Assembly ◽  
Bearing Vibration ◽  
Vibration Signatures ◽  
The Relationship ◽  
High Rejection ◽  
Vibration Noise

The main objective of this paper is to determine the relationship between bearing vibration/noise and the amount of flaws existed in a ball bearing assembly. In this study, 30 “good” and 30 “bad” typical ball bearings used for transmissions in household appliances are used for experimental vibration testing and measurements of flaws. While the “good” bearings are obtained form the lot of bearings tested for acceptable noisy level and the “bad” bearings are obtained from the lot with high rejection level. Although some irregularities are found in the ball elements, but most of the flaws are found in the outer races of the “bad” bearings. The levels of the flaws are measured using micrometers and vibration levels of the bearings are obtained from the accelerometers attached to the bearing supports at the bearing test rig. Time domain, frequency domain, and chaotic vibration signatures for the bearing are examined to correlate with the levels of flaws in the outer races of the bearings. The results from the FFT spectra show that the average vibration amplitude of the “bad” bearing is about 5 times higher than those of the “good” bearings.

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