Dynamic Interactions Between the Rolling Element and the Cage in Rolling Bearing Under Rotational Speed Fluctuation Conditions

2019 ◽  
Vol 141 (9) ◽  
Author(s):  
Wenbing Tu ◽  
Ya Luo ◽  
Wennian Yu
Keyword(s):  
Dynamic Model ◽  
Rotational Speed ◽  
Rolling Bearing ◽  
Nonlinear Dynamic Model ◽  
Dynamic Interactions ◽  
Interaction Forces ◽  
Rolling Element ◽  
Speed Fluctuation ◽  
Rolling Elements ◽  
Fluctuation Frequency

Abstract A nonlinear dynamic model is proposed to investigate the dynamic interactions between the rolling element and cage under rotational speed fluctuation conditions. Discontinuous Hertz contact between the rolling element and the cage and lubrication and interactions between rolling elements and raceways are considered. The dynamic model is verified by comparing simulation result with the published experimental data. Based on this model, the interaction forces and the contact positions between the rolling element and the cage with and without the rotational speed fluctuation are analyzed. The effects of fluctuation amplitude, fluctuation frequency, and cage pocket clearance on the interaction forces between the rolling element and the cage are also investigated. The results show that the fluctuation of the rotational speed and the cage pocket clearance significantly affects the interaction forces between the rolling element and the cage.

Nonlinear Dynamic Modeling and Vibration Analysis of Faulty Rolling Bearing Based on Collision Impact

2021 ◽  
Vol 16 (6) ◽  
Author(s):  
Longkui Zheng ◽  
Yang Xiang ◽  
Chenxing Sheng
Keyword(s):  
Kinetic Energy ◽  
Potential Energy ◽  
Dynamic Model ◽  
Nonlinear Dynamic ◽  
Rolling Bearing ◽  
Hertzian Contact ◽  
Nonlinear Dynamic Model ◽  
Impact System ◽  
Rolling Element ◽  
The Impact

Abstract This study proposes a new nonlinear dynamic model of rolling bearing faults based on a collision impact system. The dynamic model accounts for the collision impact system consisting of the rolling elements and localized faults according to the nonlinear Hertzian contact. First, considering the impact of the rolling element and fault structure, the collision impact system between rolling element and localized fault is established, and the vibration responses of the collision impact system can be obtained. Second, the overall rolling bearing is treated as a mass-spring model, and the contact between the rolling element and raceway is treated as a nonlinear spring that conforms to the Hertzian contact deformation theory. Third, according to the Lagrange equation, overall potential energy, overall kinetic energy, elastic potential energy, and kinetic energy of the collision impact system are used to describe the vibration characteristics. Considering the impact of collision impact systems, a nonlinear dynamic model of rolling bearing faults is established. The simulated acceleration results based on the nonlinear dynamic model are compared to experimental results. The comparison indicates that the numerical model can be used to predict the vibration characteristics of rolling bearings faults effectively.

Rolling bearing damping for dynamic analysis of multi-body systems—experimental and theoretical results

2000 ◽  
Vol 214 (1) ◽  
pp. 33-43 ◽  
Author(s):  
P Dietl ◽  
J Wensing ◽  
G C van Nijen
Keyword(s):  
Hydrodynamic Lubrication ◽  
Rolling Bearing ◽  
Classical Approach ◽  
Lubricated Contacts ◽  
Rolling Element ◽  
Rolling Elements ◽  
Experimental Approaches ◽  
Multi Body ◽  
Damping Model ◽  
Damping Capability

The present paper deals with the measurement and calculation of the damping capability of rolling element bearings. Rolling bearing damping is strongly influenced by the lubricated contacts between rolling elements and raceways. A theoretical model for calculating lubricant film (elasto-hydrodynamic lubrication) damping is briefly described in the first part of this paper. Furthermore, a relationship for estimating damping due to other dissipative mechanisms in the bearing is suggested. In the second part, two experimental approaches for measuring rolling bearing damping are discussed. The first (more ‘classical’) approach is based on conventional frequency response measurements and was used to verify the developed damping model regarding the influence of bearing lubrication, speed and preload. Finally, a new experimental approach for identifying rolling bearing damping is presented, eliminating some of the drawbacks of the ‘classical’ approach.

scholarly journals Analisa Getaran Akibat Kerusakan Deep Grove Ball Bearing Seri 6003RS

2019 ◽  
Vol 9 (02) ◽  
pp. 39-43
Author(s):  
Muhamad Riva’i ◽  
Nanda Pranandita
Keyword(s):  
Ball Bearing ◽  
Rolling Bearing ◽  
Internal Diameter ◽  
Outer Diameter ◽  
Outer Race ◽  
Deep Groove ◽  
Deep Groove Ball Bearing ◽  
Rolling Element ◽  
Rolling Elements ◽  
Vibration Measuring

Measurement of the damage of elements in bearing can be by measuring the vibration generated in the form of a frequency signal when the pad is rotating. Measurement of vibration on the bearing by using vibration measuring instrument. Damage to the rolling bearing includes damage to the cage, outer ring, inner ring and balls. The rolling bearings used in this study are deep groove ball bearing type 6003 RS with internal diameter (d) = 17 mm, outer diameter (D) = 35 mm, bearing thickness (B) = 10, number of rolling elements (Nb) = 10 pieces, and the diameter of the rolling element (Bd) = 4.75 mm. In the rotation of the bearing (Fr) = 2003 rpm (33.38 Hz) we found the experimental results of bearings that have been damaged in the outer race at 138 Hz frequency, inner race damage at 196 Hz frequency, (ball) at a frequency of 88.8 Hz and cage damage at a frequency of 13.8 Hz.

Detection of the Process Equipment Components Flaws with the Aid of Thermography

2008 ◽  
Vol 59 (3) ◽  
pp. 325-330
Author(s):  
Atef Mazioud ◽  
Jean Felix Durastanti ◽  
Laurent Ibos ◽  
Nicoleta Teodorescu
Keyword(s):  
Mechanical Vibration ◽  
Flaw Detection ◽  
Infrared Camera ◽  
Rolling Bearing ◽  
Process Equipment ◽  
Rolling Element ◽  
Rolling Elements ◽  
Detection And Diagnosis ◽  
Bearing Cap ◽  
Spalling Defect

The paper presents the problem of the process equipment parts flaw detection with the aid of thermography instead of vibratory analysis. It is presented as an example, a new method (proposed by the authors) of the spalling in rolling-element bearings detection and diagnosis. The idea is to show the existing correlation between the outside temperature of the bearing cap and the vibratory level generated by increasing occurrence of the defect. An experimental study was performed on the test ring which allows the generation, in a progressive manner, of a spalling defect on the external ring of the rolling bearing. On this test rig, simultaneously were measured the mechanical vibration in the radial direction (by means of a piezoelectric accelerometer) and the bearing cap external surface temperature (by means of an infrared camera). The results exhibit a significant correlation between both measures. A detailed study of the heat transfer between the rolling elements and the spalling outside border permits evaluation of the temperature rise due to the heat generated from the defect.

Investigation of the dynamic local skidding behaviour of rollers in cylindrical roller bearings

2019 ◽  
Vol 233 (4) ◽  
pp. 899-909
Author(s):  
Wenbing Tu ◽  
Ya Luo ◽  
Wennian Yu ◽  
Yinquan Yu
Keyword(s):  
Dynamic Model ◽  
Great Influence ◽  
Rolling Element Bearings ◽  
Sliding Velocity ◽  
Hertz Contact ◽  
Nonlinear Dynamic Model ◽  
Roller Bearings ◽  
Impact Forces ◽  
Rolling Element ◽  
Cylindrical Roller

Skidding has a great influence on the reliability and the life of rolling element bearings. The previous research of bearing skidding mainly focussed on the gross skidding of bearings under severe conditions. However, the local skidding of rolling element also exists and cannot be ignored when bearing normally runs at steady state. In this paper, considering the discontinuous contact between the roller and the cage, the Hertz contact between the roller and races, lubrication, centrifugal effects and the cage pocket clearance, a nonlinear dynamic model is established to investigate the local skidding behaviour of a roller in cylindrical roller bearings. The equations of the dynamic model are solved by the fourth-order Runge–Kutta algorithm and verified by comparing simulation results with the published experimental data. The results show that the local skidding of the roller still noticeably exists in bearings even when the gross skidding can be ignored, especially on the inner raceway. The local skidding at the entry of the loaded zone may cause the smearing on the raceway surface. However, it can be found that the probability of the local skidding of the roller will be decreased by increasing radial load and reducing the bearing rotational speed. The cage pocket clearance would induce violent fluctuations on the roller rotational angular velocity as well as on the sliding velocity. Furthermore, it can generate extraordinary impact forces between the rollers and the cage. Thus, the cage pocket clearance should be carefully considered in the design of bearings.

scholarly journals Dynamic positioning accuracy of dual-axis drive mechanism of satellite antenna with multi-clearance coupling

2018 ◽  
Vol 198 ◽  
pp. 06002
Author(s):  
Chaoqun Qi ◽  
Huibo Zhang ◽  
Bindi You ◽  
Jizhuang Fan ◽  
Shijie Dai
Keyword(s):  
Dynamic Model ◽  
Rotational Speed ◽  
Radial Clearance ◽  
Driving Mechanism ◽  
Dynamic Positioning ◽  
Nonlinear Dynamic Model ◽  
Positioning Accuracy ◽  
Satellite Antenna ◽  
Drive Mechanism ◽  
Axis Drive

The dual-axis drive mechanism of satellite antenna as a typical multi-joint aerospace mechanism consists of azimuth axis and pitch axis. The multi-clearance contained within those drive joint cause contact and impact in joint, and consequently affect the dynamic positioning accuracy. A nonlinear dynamic model of planetary gears with multiple clearances couplings is proposed to investigate the influence mechanism of clearances on the dynamic performances. The nonlinear factors such as radial clearance, backlash and time-varying meshing stiffness of the bearing are considered in the model. And the dynamic model of double-axis driving mechanism of satellite antenna with multi-clearance coupling is established. Then positional and rotational speed error curves of antenna reflector at different rotational speed are respectively analyzed. The numerical simulation results show that the influence of multi-clearance coupling on the dynamic positioning accuracy of double-axis drive mechanism of satellite antenna is remarkable.

Dynamics of Bearing Shaft Systems

2005 ◽  
Author(s):  
Farshid Sadeghi ◽  
Carl Wassgren ◽  
Nicholas Prenger ◽  
Niranjan Ghaisas ◽  
Eric Chamberlain
Keyword(s):  
Rolling Bearing ◽  
Rolling Element Bearings ◽  
Loading Conditions ◽  
Rotating Shaft ◽  
Type Analysis ◽  
Rolling Element ◽  
Rolling Elements ◽  
Bearing Dynamics ◽  
Bearing System

The objective of this study was to develop a bearing model which can be combined with shafts, gears etc. to virtually investigate the motion and loading of the elements in the bearing. Models for ball, cylindrical and tapered rolling bearing dynamics have been designed, developed and combined with rigid and flexible shafts subject to various loading conditions and eccentric masses. The results from this investigation demonstrated that for rotating shaft bearing systems, the motion and the loads on the rolling elements are significantly different than that predicted by static and / or quasi-static type analysis. Results from shaft bearing system, where shaft may be supported by combinations of ball and rolling element bearings will be demonstrated. Cage motion and stability under various load and speed combinations will be discussed.

Multibody Rolling Bearing Calculations: Computer Program BEAST

2005 ◽  
Author(s):  
E. Ioannides ◽  
L.-E. Stacke ◽  
D. Fritzson ◽  
I. Nakhimovski
Keyword(s):  
Computer Program ◽  
High Efficiency ◽  
Rapid Development ◽  
Rolling Bearing ◽  
Rolling Element Bearings ◽  
Jet Engines ◽  
Simulation Tools ◽  
Rolling Element ◽  
Rolling Elements ◽  
Multi Body

The need for rapid development of high efficiency jet engines and other mechanical systems has forced the pace of development of simulation tools so that the detailed behavior of the rolling element bearings can be simulated. This includes modeling of the motions, the exchanged forces, and heat between all the bearing components, i.e. rings, cage and rolling elements. The computer program BEAST is a multi-body computer program with sophisticated and robust modeling of the tribological contacts in the bearing where the exchange of forces between the bearing components takes place.

scholarly journals A Simplified Mathematical Model for the Analysis of Varying Compliance Vibrations of a Rolling Bearing

2020 ◽  
Vol 10 (2) ◽  
pp. 670 ◽  
Author(s):  
Radoslav Tomović
Keyword(s):  
Mathematical Model ◽  
Parametric Analysis ◽  
Rolling Bearing ◽  
Influential Factors ◽  
Radial Clearance ◽  
Radial Load ◽  
Simplified Approach ◽  
Rolling Element ◽  
Rolling Elements ◽  
Varying Compliance

In this paper, a simplified approach in the analysis of the varying compliance vibrations of a rolling bearing is presented. This approach analyses the generation of vibrations in relation to two boundary positions of the inner ring support on an even and an odd number of the rolling element of a bearing. In this paper, a mathematical model for the calculation of amplitude and frequency of vibrations of a rigid rotor in a rolling bearing is presented. The model is characterized by a big simplicity which makes it very convenient for a practical application. Based on the presented mathematical model a parametric analysis of the influence of the internal radial clearance, external radial load and the total number of rolling elements on the varying compliance vibrations of rolling bearing was conducted. These parameters are the most influential factors for generating varying compliance vibrations. The results of the parametric analysis demonstrate that with the proper choice of the size of the internal radial clearance and external radial load, the level of the varying compliance vibrations in a rolling bearing can be theoretically reduced to zero. This result opposes the opinion that varying compliance vibrations of rolling bearing cannot be avoided, even for geometrically ideally produced bearing.

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