Study on Nonlinear Vibration and Dynamic Characteristics of Rigid Rotor Roller Bearing System

2009 ◽  
Author(s):  
Li Cui ◽  
Changli Liu ◽  
Jianrong Zheng
Keyword(s):  
Dynamic Characteristics ◽  
Roller Bearing ◽  
Nonlinear Behavior ◽  
Analysis Data ◽  
Rotor System ◽  
Hertzian Contact ◽  
Accurate Analysis ◽  
Axis Orbit ◽  
Raphson Method ◽  
Bearing System

Rotor system supported by roller bearing displays complicated nonlinear behavior due to nonlinear Hertzian contact force of roller bearing. In this paper, nonlinear bearing forces of roller bearing under four-dimensional loads are given, and four-DOF dynamic equations of rotor roller bearing system are established. The Newmark-β method and Newton-Raphson method are used to solve the nonlinear equations. In order to obtain accurate analysis data, the dynamic characteristics of rotor roller bearing system are computed considering coupling of bearing and rotor system. Finally, the critical speed of the rotor roller bearing system and axis orbit of the rotor are measured on a rotor bearing test bench, which are compared with the analysis results. The results demonstrate that the model and methods put forward in this paper to forecast the characteristics of rotor roller bearing system are precise.

Study on dynamic characteristics of angular ball bearing with non-linear vibration of rotor system

2008 ◽  
Vol 222 (9) ◽  
pp. 1811-1819 ◽  
Author(s):  
L-Q Wang ◽  
L Cui ◽  
L Gu ◽  
D-Z Zheng
Keyword(s):  
Dynamic Characteristics ◽  
Ball Bearing ◽  
Linear Equations ◽  
Rotor System ◽  
Hertzian Contact ◽  
Initial Contact ◽  
Linear Vibration ◽  
Non Linear ◽  
Linear Behaviour ◽  
Bearing System

A rotor system supported by an angular ball bearing displays very complicated non-linear behaviour due to non-linear Hertzian contact force. The non-linear force and moment caused by the ball bearing are calculated on the basis of the relationship between deflection, and five-degree-of-freedom dynamic equations of the rotor ball bearing system are established. The Newmark-β method and the Newton—Raphson method are used to solve the non-linear equations. The dynamic characteristics of angular ball bearings are computed, considering the non-linear vibration of the rotor system. Taking angular ball bearing QJS208ACQ4C1/HNP4 as an example, the effects of the vibration of the rotor system on bearing dynamic characteristics are analysed. The results show that the spin-to-roll ratio of balls, the slide ratio of the cage, and stiffness of the bearing all vary obviously with the non-periodic vibration range of the rotor; initial contact angle and axial load of the ball bearing change the non-linear dynamic nature of the rotor system and dynamic characteristics of the bearing. The rotor ball bearing system can work stably by choosing the structural and operation parameters reasonably.

Dynamic simulation for a tapered roller bearing considering a localized surface fault on the rib of the inner race

2017 ◽  
Vol 231 (4) ◽  
pp. 670-683 ◽  
Author(s):  
Jing Liu ◽  
Yimin Shao ◽  
Xiaomeng Qin
Keyword(s):  
Dynamic Simulation ◽  
Roller Bearing ◽  
Simulation Method ◽  
Vibration Characteristics ◽  
Hertzian Contact ◽  
Tapered Roller Bearing ◽  
Bearing Condition Monitoring ◽  
Tapered Roller ◽  
Inner Race ◽  
Bearing System

Vibration characteristics of a tapered roller bearing system will be significantly affected by a localized surface fault in the rib of the inner race. The operating condition for the tapered roller bearing system is always monitored to prevent serious failures from happening based on changes in the vibration characteristics. However, most of the previous works are focused on dynamic simulations for a localized surface fault in the race surface. A new dynamic simulation method for a tapered roller bearing with a localized surface fault on the rib of the inner race is proposed. The non-Hertzian contact of taper roller to races and rib is considered. The time-varying deflection excitation caused by the fault is formulated in the proposed method, as well as both the axial and radial contact deformation between the races and rollers. Effects of the axial load, radial load, and fault sizes on the vibration characteristics for the tapered roller bearing are analyzed. An experimental investigation is also developed to validate the proposed method. The results show that the proposed dynamic simulation method can formulate the vibration characteristics for the tapered roller bearing caused by the localized surface fault on the rib of the inner race, which may give some guidance for the tapered roller bearing condition monitoring and fault diagnosis, especially for the incipient localized surface fault.

Nonlinear Dynamics Analysis of Excitation Frequency under the Influence of the Rotor-Stator-Bearing System with Rub-Impact Fault

2014 ◽  
Vol 952 ◽  
pp. 169-175
Author(s):  
Gui Zhen Liu ◽  
Ying Yu ◽  
Bang Chun Wen
Keyword(s):  
Periodic Motion ◽  
Lagrange Equation ◽  
Excitation Frequency ◽  
Nonlinear Behavior ◽  
Rotor System ◽  
System Control ◽  
Nonlinear Phenomena ◽  
Control Parameters ◽  
Mechanical Models ◽  
Bearing System

Established the unsteady oil-film force with rub-impact fault of rotor-stator-bearing system mechanical models by using Lagrange equation, Application of numerical analysis to study it, concluded that the rotor system in frequency as the only incentive system control parameters of orbit and bifurcation diagrams; analysis of the nonlinear behavior of the response of the system and the failure mechanism, provide a theoretical basis for the safe operation of the rotor system and fault diagnosis. The results show that, when the excitation frequency as the only control parameters, the system exist periodic motion, quasi periodic motion and chaotic motion etc abundant nonlinear phenomena.

Experimental and numerical investigations on dynamic characteristics of gear-roller-bearing system

2019 ◽  
Vol 140 ◽  
pp. 730-746 ◽  
Author(s):  
Tiancheng Ouyang ◽  
Zixiang Su ◽  
Shuoyu Li ◽  
Guicong Huang ◽  
Nan Chen
Keyword(s):  
Dynamic Characteristics ◽  
Roller Bearing ◽  
Numerical Investigations ◽  
Bearing System

Effect of Varying the Number of Rollers on Dynamics of a Cylindrical Roller Bearing

2014 ◽  
Author(s):  
Aditya Sharma ◽  
M. Amarnath ◽  
P. K. Kankar
Keyword(s):  
Nonlinear Dynamic ◽  
Fourier Transforms ◽  
Roller Bearing ◽  
Hertzian Contact ◽  
Design Stage ◽  
Nonlinear Dynamic Model ◽  
Rotor Bearing ◽  
Cylindrical Roller Bearing ◽  
Cylindrical Roller ◽  
Bearing System

In present paper, nonlinear dynamic model has been developed for cylindrical roller bearings. The Hertzian contact theory is used to derive a two degree of freedom model which considers nonlinearity due to clearance. The nonlinear dynamic behaviour of cylindrical roller bearing has been studied with varying number of rollers supporting load. The modified Newmark-β numerical integration technique has been used to solve the equations of motion. All the results are presented in the form of Fast Fourier Transforms and Poincarè maps. As the number of rollers is increases, system becomes stiffer. The results show that the number of rollers supporting load is one of the important parameters affecting the dynamics of rotor bearing system. Therefore, it must be considered at the design stage to understand the dynamic characteristics and stability of the rotor bearing system.

Analysis of Non-Linear Dynamic on Unsteady Oil-Film Force Rotor-Stator-Bearing System with Rub-Impact Fault

2013 ◽  
Vol 401-403 ◽  
pp. 49-54
Author(s):  
Gui Zhen Liu ◽  
Ying Yu ◽  
Bang Chun Wen
Keyword(s):  
Periodic Motion ◽  
Lagrange Equation ◽  
Excitation Frequency ◽  
Nonlinear Behavior ◽  
Rotor System ◽  
System Control ◽  
Nonlinear Phenomena ◽  
Control Parameters ◽  
Oil Film ◽  
Bearing System

Established the unsteady oil-film force with rub-impact fault of rotor-stator-bearing system mechanical models by using Lagrange equation, Application of numerical analysis to study it, concluded that the rotor system in frequency as the only incentive system control parameters of orbit and bifurcation diagrams; analysis of the nonlinear behavior of the response of the system and the failure mechanism, provide a theoretical basis for the safe operation of the rotor system and fault diagnosis. The results show that, when the excitation frequency as the only control parameters, the system exist periodic motion, quasi periodic motion and chaotic motion etc abundant nonlinear phenomena.

Evaluation of Oil Bearing Supported Rotors Coupled by Flexible Coupling

2009 ◽  
Author(s):  
Choong Hyun Kim ◽  
Kyeong Soo Lee ◽  
Yong-Bok Lee
Keyword(s):  
Dynamic Characteristics ◽  
Rotor System ◽  
Analytical Evaluation ◽  
Flexible Coupling ◽  
Oil Film ◽  
Mechanical Coupling ◽  
Rotor Bearing ◽  
Bearing System

In this study, analytical evaluation of dynamic characteristics of the mechanical coupling and its effect on the coupled rotor-bearing system are presented. The results indicate that the oil film bearing supported rotor system may successfully be coupled by the flexible coupling.

Experiment Research of Two-Span Rotor-Bearing System with Rub-Impact and Crack Faults

2013 ◽  
Vol 706-708 ◽  
pp. 1335-1338
Author(s):  
Yue Gang Luo ◽  
Song He Zhang ◽  
Bin Wu ◽  
Hui Ma
Keyword(s):  
Dynamic Characteristics ◽  
Frequency Component ◽  
Rotor System ◽  
Test Rig ◽  
Experiment Research ◽  
Coupling Faults ◽  
Rotor Bearing ◽  
Frequency Components ◽  
Bearing System

The test rig of two-span rotor-bearing system with rub-impact and crack faults was constructed. The vibration of the rotor-bearing system was observed for different conditions, such as single rub-impact fault, double rub-impact faults and coupling faults of rubbing and crack. The 3D-waterfall spectrum of rotor system was used to analyze the dynamic characteristics of the system during faults. The results indicate there appears 6-superharmonic frequency component on double rub-impact faults. The amplitudes of subharmonic frequencies decrease obviously and it of superharmonic frequencies increases on coupling faults of rubbing and crack, and the superharmonic frequency components are different obviously in different span.

Theoretical and experimental dynamics analysis of rotor-bearing system supported by elliptical bearings

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zhiming Zhao ◽  
Rui Zhang ◽  
Feng Ji ◽  
Xiaoyang Yuan
Keyword(s):  
Peer Review ◽  
Dynamic Characteristics ◽  
Critical Speed ◽  
Design Method ◽  
Large Diameter ◽  
Rotor System ◽  
Content Type ◽  
Vibration Data ◽  
Rotor Bearing ◽  
Bearing System

Purpose High power and speed are new demands for rotating machinery which needs the journal bearings with high dynamic characteristics. The critical speed of the rotor-bearing system is one of the most significant parameters to evaluate the dynamic characteristics. This paper aims to investigate the theoretical and experimental analysis of a rotor system supported by large diameter elliptical bearings. Design/methodology/approach To obtain the theoretical and experimental support for rotor-bearing system design, dynamic characteristics theoretical analysis based on the finite difference method is given and an experiment focuses on critical speed identification is carried out. Findings The theoretical calculation results indicate that the critical speed is near to 800 rpm and there is no large vibration amplitude round working speed (1,500 rpm). Using the test bench in the factory unit, vibration data including three experimental processes are obtained. According to the vibration data, the critical speed is identified which also indicates that it is stable when working at 1,500 rpm. Originality/value The design method for the rotor system supported by large diameter elliptical bearing can be obtained by the theoretical and experimental results shown in this paper. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2020-0122/

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