Research on Coupling Vibration of Disk Crack and Shaft Crack of Rotor System Based on Finite Element Method

2020 ◽  
pp. 111-116
Author(s):  
Peng-Fei Peng ◽  
Yi-Jui Chiu ◽  
Xiao-Yun Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rotor System ◽  
Coupling Vibration ◽  
Element Method

Theoretical and Numerical Modal Analysis for Nuclear Coolant Pump and its Scaled Rotor System

2010 ◽  
Vol 44-47 ◽  
pp. 985-991
Author(s):  
Chun Ming Gong ◽  
Hong Shen ◽  
Zheng Qiang Yao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Modal Analysis ◽  
Theoretical Method ◽  
Rotor System ◽  
The Finite Element Method ◽  
Coolant Pump ◽  
Similarity Law ◽  
Nuclear Coolant ◽  
Element Method

This paper presents a theoretical transfer matrix method for the modal analysis of nuclear coolant pump, and base on certain similarity law, a scaled rotor system is designed so as to simulate the characteristics of the real nuclear coolant pump, especially the vibration characteristics. Following that, the finite element method is used to verify the accuracy of the above theoretical method since there are a few simplifications in theoretical method compared with the finite element method. Finally the natural vibration frequencies and vibration modes of both nuclear coolant pump and the designed scaled rotor system are attained, which have high similarity with each other, and which confirm the accuracy of the two methods that are used in this article.

Modeling and Analyzing for Rotor System with Imbalance-Misalignment Coupling Faults Based on Nonlinear Finite Element Method

2013 ◽  
Vol 312 ◽  
pp. 292-295
Author(s):  
Fu Ze Xu ◽  
Xue Jun Li ◽  
Guang Bin Wang ◽  
Yi Lin He
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rotor System ◽  
Nonlinear Finite Element ◽  
Rolling Element Bearing ◽  
Nonlinear Finite Element Method ◽  
Time Frequency ◽  
Coupling Faults ◽  
Study Results ◽  
Element Method

This thesis constructs the dynamical model of the imbalance-misalignment coupling faults and the finite element model of the rotor system which are supported by rolling element bearing. It analyses the impacts from the coupling faults to the system on the basis of nonlinear finite element method, dynamic theory and Newmark-beta numerical integration method. It also studies the influence of the unbalance, misalignment and coupling faults to the system by applying the dynamic response chart and time-frequency properties. The study shows that there exist unstable high and low harmonic components, the unbalanced signal overshadowed by misalignment. It also discovers that besides the working frequency, there also exist tow times frequency and other high doubling components on the response spectra with two times frequency for the most. All those study results provide some theoretical reference for the fault diagnosing of the rotor bearing system, the vibration control and the stability research.

scholarly journals Nonlinear Dynamics of Jeffcott Rotor System with Rub-Impact Fault

2011 ◽  
Vol 2-3 ◽  
pp. 722-727
Author(s):  
Ya Zhe Chen ◽  
Li Qun Liu ◽  
Yang Liu ◽  
Bang Chun Wen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Reliability ◽  
Element Model ◽  
Rotor System ◽  
Lumped Mass ◽  
Main Research ◽  
Study Results ◽  
Jeffcott Rotor ◽  
Element Method

The rub-impact fault of Jeffcott rotor system which is generally made of an elastic shaft with supported by two bearings at ends and a lumped mass at the mid-span of shaft is the main research subject of this paper. The mechanical model and finite element model of a lump mass at the mid-span of shaft is set up. The dynamics of it are studied by nonlinear finite element method under the rub-impact conditions, and by investigating the effects of stiffness of stator and the clearance between rotor-stator. From the study results, use finite element method to study the rotor system failure problem is intuitive and convenient, high accuracy, high reliability, can be widely applied.

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