scholarly journals Dynamic Contact Characteristics of Elastic Composite Cylindrical Roller Bearing

2015 ◽  
Vol 9 (1) ◽  
pp. 703-708 ◽  
Author(s):  
Jianghong Yu ◽  
Ran Zhang ◽  
Wen Yang ◽  
Qishui Yao
Keyword(s):  
Roller Bearing ◽  
Dynamic Contact ◽  
Element Model ◽  
Dynamic Responses ◽  
Response Analysis ◽  
Elastic Composite ◽  
Fluctuation Amplitude ◽  
Cylindrical Roller Bearing ◽  
Explicit Dynamic ◽  
Cylindrical Roller

Elastic composite cylindrical roller bearing is a kind of new bearing. In view of its structural particularity, explicit dynamics finite element model of elastic composite cylindrical roller bearing is established by utilizing ABAQUS/EXPLICIT. Dynamic responses of elastic composite cylindrical roller bearing are analyzed and response analysis is compared under different radial loads and rotation speeds. Dynamic responses of elastic composite cylindrical roller bearing are analyzed and response analysis is compared under different radial loads and rotation speeds. Results show that rolling and holder lag in rotation is as being compared to inner ring. The motion processes of all the holder, inner ring and roller have certain periodicity. Fluctuation amplitude of inner ring displacement increases with load. Response increases with rotation speed when amplification decreases. Analysis results can offer beneficial reference for further research on dynamic characteristics of elastic composite cylindrical roller bearing.

Modal and harmonic response analysis of a rolling bearing coupled by rigid and flexible materials

2019 ◽  
Vol 9 (9) ◽  
pp. 1017-1024
Author(s):  
Jianghong Yu ◽  
Lei Xiang ◽  
Wen Yang ◽  
Chao Li ◽  
Yaoyao Deng ◽  
...  
Keyword(s):  
Structural Parameters ◽  
Excitation Frequency ◽  
Roller Bearing ◽  
Response Analysis ◽  
Harmonic Response ◽  
Flexible Materials ◽  
Roller Bearings ◽  
Elastic Composite ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

Elastic composite cylindrical roller bearing is a new type of rolling bearings. Its rolling body is composed of rigid and flexible materials. In order to investigate the modal characteristics and harmonic response rules of the elastic composite cylindrical roller bearings with different structural parameters, we computed the modal solutions of a cylindrical roller bearing and the elastic composite cylindrical roller bearings with filling degrees of 40%, 50% and 65%, and determined the scope of the excitation frequency according to the computed first twelve orders of the modal frequency. On this basis, we analyzed the steady-state response under a sinusoidal alternating load as well as the vibration conditions of the elastic composite cylindrical roller bearings with different filling degrees within the excitation scope, and explored the relationship between the responses such as displacement and stress and the excitation frequency. The results showed that the natural frequencies of the elastic composite cylindrical roller bearings with filling degrees of 40% and 50% were similar to that of a solid bearing, while that of the elastic composite cylindrical roller bearings with a filling degree of 65% was relatively smaller than that of a solid bearing. The vibration modes of the bearings mainly manifested as bending and torsional deformation of the inner rings. Under the action of an excitation load, the peak responses of the bearings occurred near the fifth and sixth orders of the natural frequency. This research can provide a theoretical reference for the optimal design and engineering applications of the elastic composite cylindrical roller bearings.

Dynamic Analysis of a Cylindrical Roller Bearing With Time-Varying Localized Defects on Raceways

2015 ◽  
Author(s):  
Fengtao Wang ◽  
Li Chen ◽  
Heng Liu ◽  
Minqing Jing ◽  
Wei Chen ◽  
...  
Keyword(s):  
Roller Bearing ◽  
Step Function ◽  
Dynamic Responses ◽  
Experimental Comparison ◽  
Time Varying ◽  
Proposed Model ◽  
Time Domains ◽  
Localized Defects ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

An existing defect on the bearing raceway may evolve with the interactions between the bearing elements, and the evolutions of the defect may be divided into different stages. In this study, a dynamic model for a cylindrical roller bearing with localized defects on raceways is developed to investigate vibration character of the bearing in these stages. The coupling of centrifugal forces, gravity forces and the slipping of the roller are considered. The half sine function and step function are used to construct time-varying models of defects in different stages, which is reflected on the local deflection. The system dynamic equations are solved by the fourth-order Runge-Kutta integration method with variable steps. Time domains and frequency domains are used to analyze dynamic responses of the bearing in every defect stage, which can be used as a reference of fault diagnosis. An experimental comparison in the previous study is carried out to validate the proposed model.

scholarly journals A Design Method for a New Type of Cylindrical Roller Bearing Based on Edge Effect

2016 ◽  
Vol 10 (1) ◽  
pp. 98-108
Author(s):  
Yao Qishui ◽  
Yang Wen ◽  
Li Chao ◽  
Yu Jianghong
Keyword(s):  
Neural Network ◽  
Genetic Algorithm ◽  
Bp Neural Network ◽  
Roller Bearing ◽  
Deep Hole ◽  
Design Variables ◽  
Elastic Composite ◽  
New Type ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

The elastic composite cylindrical roller bearing is a new type of bearing designed with polytetrafluoroethylene filling in a deep hole hollow roller. This design can improve the stress concentration and also performance of the bearing. A study was conducted to parameterize the deep hole structure to obtain its design variables, the angle a and radius c by studying the influence of the design on stress concentration in elastic composite cylindrical roller bearing edge; to determine the BP neural network sample data using orthogonal test and finite element methods; to establish mapping relationship between the design variables and the maximum stress by BP neural network learning algorithm and to obtain the objective function required for structural optimization of genetic algorithm. The study attempts to optimize, search and calculate the most fitting structural parameters of elastic composite cylindrical roller by genetic algorithm with NU318E bearing as the optimization object and obtain the values of optimal design variables as a = 48.68° and c=9.67mm. The work also includes minimization of the comprehensive value of the maximum contact stress and the maximum equivalent stress of the edge and elliptic zones of elastic composite cylindrical roller after optimizing and increasing the contact fatigue service and bearing capacity of the bearing. The optimization procedure and method presented in this paper can serve as a useful reference to the optimization of structure for other elastic composite cylindrical roller edges.

Study on the Performance of Wollastonite Modified PTFE Composite Material

2015 ◽  
Vol 1089 ◽  
pp. 28-32 ◽  
Author(s):  
Jiang Hong Yu ◽  
Chao Li ◽  
Qi Shui Yao
Keyword(s):  
Composite Materials ◽  
Roller Bearing ◽  
Small Dimension ◽  
Heavy Load ◽  
Ptfe Composite ◽  
Light Load ◽  
Elastic Composite ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller ◽  
Load Conditions

In the research, Polytetrafluoroethene (PTFE) is applied in a newly elastic composite cylindrical roller bearing, i.e. PTFE is modified into the traditional hollow cylindrical roller bearing so as to improve the vibration, wearing properties and life span of the roller bearing. The results show that bearing capacity of the same dimension of WF/PTFE composite materials is higher than that of WP/PTFE composite materials. Small dimension of WF-PTFE composite materials has the best wearing properties under light load conditions; large dimension of WF-PTFE composite materials has better bearing capacity and wearing properties than small dimension of WF filler under heavy load conditions. Compare to traditional method, Rolling stress improves by filler PTFE materials using our method reduces by 17.1% under light load conditions and reduces by 27.7% under heavy load conditions. The research provides basis for the modified material of the elastic composite cylindrical roller bearing.

Distribution characteristics of stress and displacement of rings of cylindrical roller bearing

2018 ◽  
Vol 233 (12) ◽  
pp. 4348-4358 ◽  
Author(s):  
Xu Hao ◽  
Xinxin Gu ◽  
Xianwen Zhou ◽  
Xin Liao ◽  
Qingkai Han
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Roller Bearing ◽  
Mesh Size ◽  
Element Model ◽  
Housing System ◽  
Bearing Stiffness ◽  
Stiffness Characteristics ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller

In this paper, the developed finite element model of the shaft-cylindrical roller bearing–bearing housing system is established considering the temperature effect and clearance change. The displacement, raceway stress, and bearing stiffness characteristics of the inner and outer rings of the bearing are systematically investigated. The proposed finite element model is validated through adjusting mesh size of the bearing and the comparison of the elastic deformation of the bearing with the experiment. The influence of load, clearance, and temperature expansion on the displacement distribution of the inner and outer rings of the bearing, raceway stress, and stiffness characteristics are all discussed. The obtained results indicate that an appropriate selection of thermal expansion stress can obtain desirable working ambient temperature of the bearing under different clearances, which can serve as an efficient tool in the design of bearing parameters.

scholarly journals Safety Characteristic Evaluation of Cage in Cylindrical Roller Bearing at the Stage of Start-Up and Stop

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Zhang Wenhu ◽  
Wu Zhimin ◽  
Deng Sier ◽  
Zhang Song ◽  
Tian Heng ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Structural Parameters ◽  
Roller Bearing ◽  
Element Model ◽  
Main Shaft ◽  
Start Up ◽  
Cylindrical Roller Bearing ◽  
Safety Characteristic ◽  
Cylindrical Roller

The dynamics model of cylindrical roller bearing (CRB) in aeroengine main shaft was promoted and solved by Hilber–Hughes–Taylor (HHT) integer algorithm with variable step in combination with symmetric multiprocessing (SMP) parallel solving technology, and a finite element model of roller to cage contact was built. The dynamic characteristics of CRB at the stage of start-up and stop were analyzed firstly, and then, the collision forces between rollers and cage were used as the boundary conditions of the finite element model to discuss the influences of working conditions, structural parameters, and materials on the stress distribution and safety characteristic of cage at the stage of start-up and stop. The findings will provide the theoretical basis for the designing of CRB in aeroengine main shaft.

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