Effect of Localized Defect on the Vibration Behavior of Cylindrical Roller Bearing-Rotor System

2013 ◽  
pp. 297-319 ◽  
Author(s):  
U. A. Patel ◽  
S. H. Upadhyay
Keyword(s):  
Roller Bearing ◽  
Rotor System ◽  
Vibration Behavior ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

Nonlinear vibration prediction of cylindrical roller bearing rotor system modeling for localized defect at inner race with finite element approach

2016 ◽  
Vol 231 (4) ◽  
pp. 647-657 ◽  
Author(s):  
Utkarshkumar A Patel ◽  
Bhoomi S Naik
Keyword(s):  
Finite Element ◽  
System Modeling ◽  
Equations Of Motion ◽  
Roller Bearing ◽  
Rotor System ◽  
Nonlinear Matrix Equation ◽  
Time Step ◽  
Vibration Prediction ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

In this paper, an analytical model is proposed to study the behavior of defective bearing and rotor system. An overhung rotor system and defective roller bearing are considered for the study. Rotor is considered with unbalanced mass and bearing is taken as the cylindrical roller bearing having localized surface defect. To analyze all the system components’ effect at one node, finite element method is used to predict exact system vibrations. Euler–Bernoulli’s beam element is used to discretize the shaft. Gyroscopic effect of overhung rotor is also taken into account and governing equations of motion have been modified according to our system. Hertz contact stress theory is used for every roller–race contact to calculate the overall nonlinear bearing force. Governing differential equation is solved by Newmark-β time integration method. Nonlinear matrix equation, which is generated at each time-step in Newmark’s method, is solved by Broyden’s method. Results for defective bearing are obtained and plotted in the time and frequency domain. Poincare map has been plotted to view the system’s minimum stability time. An experiment has been carried out to validate the proposed analysis work. In this paper, it has been shown how rotor dynamic analysis can be achieved numerically with minimum calculations.

Load distribution in cylindrical roller bearing with EHD lubricated contact force

2019 ◽  
Author(s):  
Natália Akemi Hoshikawa Tsuha ◽  
Fabio Nonato ◽  
Katia Lucchesi Cavalca Dedini
Keyword(s):  
Contact Force ◽  
Load Distribution ◽  
Roller Bearing ◽  
Lubricated Contact ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

scholarly journals Dynamic Performance of a Squeeze Film Damper with a Cylindrical Roller Bearing under a Large Static Radial Loading Range

Machines ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 14 ◽  
Author(s):  
Hans Meeus ◽  
Jakob Fiszer ◽  
Gabriël Van De Velde ◽  
Björn Verrelst ◽  
Wim Desmet ◽  
...  
Keyword(s):  
Roller Bearing ◽  
Squeeze Film ◽  
Stable Operation ◽  
Large Power ◽  
Squeeze Film Damper ◽  
Depth Analysis ◽  
Rotor Support ◽  
Cylindrical Roller Bearing ◽  
Radial Loading ◽  
Cylindrical Roller

Turbomachine rotors, supported by little damped rolling element bearings, are generally sensitive to unbalance excitation. Accordingly, most machines incorporate squeeze film damper technology to dissipate mechanical energy caused by rotor vibrations and to ensure stable operation. When developing a novel geared turbomachine able to cover a large power range, a uniform mechanical drivetrain needs to perform well over the large operational loading range. Especially, the rotor support, containing a squeeze film damper and cylindrical roller bearing in series, is of vital importance in this respect. Thus, the direct objective of this research project was to map the performance of the envisioned rotor support by estimating the damping ratio based on the simulated and measured vibration response during run-up. An academic test rig was developed to provide an in-depth analysis on the key components in a more controlled setting. Both the numerical simulation and measurement results exposed severe vibration problems for an insufficiently radial loaded bearing due to a pronounced anisotropic bearing stiffness. As a result, a split first whirl mode arose with its backward component heavily triggered by the synchronous unbalance excitation. Hence, the proposed SFD does not function properly in the lower radial loading range. Increasing the static load on the bearing or providing a modified rotor support for the lower power variants will help mitigating the vibration issues.

Investigation on the drag effect of a rolling element confined in the cavity of a cylindrical roller bearing

2021 ◽  
pp. 135065012110260
Author(s):  
Wenjun Gao ◽  
Shuo Zhang ◽  
Xiaohang Li ◽  
Zhenxia Liu
Keyword(s):  
Open Space ◽  
Roller Bearing ◽  
Flow Characteristics ◽  
Experimental Tests ◽  
Windward Side ◽  
Leeward Side ◽  
Drag Effect ◽  
Rolling Element ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

In cylindrical roller bearings, the drag effect may be induced by the rolling element translating in a fluid environment of the bearing cavity. In this article, the computational fluid dynamics method and experimental tests are employed to analyse its flow characteristics and pressure distribution. The results indicate that the pressure difference between the windward side and the leeward side of the cylinder is raised in view of it blocking the flow field. Four whirl vortexes are formed in four outlets of two wedge-shaped areas between the front part of the cylindrical surface and adjacent walls for the cylinder of L/ D = 1.5 at Re = 4.5 × 103. Vortex shedding is found in the direction of cylinder axis at Re = 4.5 × 104. The relationship between drag coefficient and Reynolds number is illustrated, obviously higher than that of the two-dimensional cylinder in open space.

Dynamics of Rolling-Element Bearings—Part I: Cylindrical Roller Bearing Analysis

1979 ◽  
Vol 101 (3) ◽  
pp. 293-302 ◽  
Author(s):  
P. K. Gupta
Keyword(s):  
Differential Equations ◽  
Normal Force ◽  
Equations Of Motion ◽  
Roller Bearing ◽  
Rolling Element Bearings ◽  
Analytical Formulation ◽  
Rolling Element ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller ◽  
Bearing Analysis

An analytical formulation for the roller motion in a cylindrical roller bearing is presented in terms of the classical differential equations of motion. Roller-race interaction is analyzed in detail and the resulting normal force and moment vectors are determined. Elastohydrodynamic traction models are considered in determining the roller-race tractive forces and moments. Formulation for the roller end and race flange interaction during skewing of the roller is also considered. Roller-cage interactions are assumed to be either hydrodynamic or fully metallic. Simple relationships are used to determine the churning and drag losses.

scholarly journals Mechanical performance analysis of hollow cylindrical roller bearing of cone bit by FEM

Petroleum ◽  
2015 ◽  
Vol 1 (4) ◽  
pp. 388-396 ◽  
Author(s):  
Chuanjun Han ◽  
Cheng Yu ◽  
Ying Li ◽  
Jiawei Yan ◽  
Jie Zhang
Keyword(s):  
Performance Analysis ◽  
Mechanical Performance ◽  
Roller Bearing ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller
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