scholarly journals Experimental and Numerical Investigations of a Flexible Rotor on Flexible Bearing Supports

2005 ◽  
Vol 2005 (3) ◽  
pp. 179-189 ◽  
Author(s):  
J.-J. Sinou ◽  
C. Villa ◽  
F. Thouverez
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Flexible Rotor ◽  
Rolling Bearings ◽  
Campbell Diagram ◽  
Static Tests ◽  
Flexible Supports ◽  
Measured Frequency Response ◽  
Rotor Dynamic

The main goal of this paper is to study, numerically and experimentally, the effects of the bearing support flexibility on the rotor dynamic and the first forward and backward critical speeds. The test rig which is used in this study has been developed and built at the École Centrale de Lyon (France). This flexible rotor, supported by two rolling bearings on flexible supports, is used for three configurations of the flexible supports. The support characteristics are determined experimentally by performing static tests. Moreover, a finite element model of this flexible rotor is presented which consists of a rigid disk on a flexible shaft supported by two bearing supports. On the basis of measured frequency response functions for various rotational speeds, eigenfrequencies and the associated Campbell diagram from the numerical model and the related experimental results for the flexible rotor are discussed. The comparison of these experimental and numerical tests are used in order to update the finite element model and the associated moment stiffness of the two rolling bearings for the three configurations of interest.

Updating Rotor-Bearing Finite Element Models

1997 ◽  
Author(s):  
Cristinel Mares ◽  
Cecilia Surace
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Parameters Estimation ◽  
Flexible Rotor ◽  
Estimation Errors ◽  
Rotor Bearing ◽  
Bearing Stiffness ◽  
Measured Frequency Response ◽  
Stiffness And Damping ◽  
The Finite Element Model

Abstract In this paper, the possibility of updating the finite element model of a rotor-bearing system by estimating the bearing stiffness and damping coefficients from a few measured Frequency Response Functions using a Genetic Algorithm is investigated. The issues of identifiability and parameters estimation errors, computational costs and algorithm tuning are addressed. A simulated example of a flexible rotor supported by orthotropic bearings is used for illustrating the method.

A Flexible Rotor on Flexible Supports: Modeling and Experiments

2009 ◽  
Author(s):  
Emre Dikmen ◽  
Peter van der Hoogt ◽  
Andre´ de Boer ◽  
Ronald Aarts ◽  
Ben Jonker
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Structural Model ◽  
Element Model ◽  
Flexible Rotor ◽  
Static Loads ◽  
Flexible Supports ◽  
Simple Support ◽  
Modeling And Experiments ◽  
Mass Spring

In this study, a flexible rotor with variable support stiffness has been analyzed. Simple support models consisting of mass, spring systems are extracted from modal analysis of the isolated support and by applying static loads to the finite element model of the supports. The derived equivalent models of the supports are then implemented in the finite element based structural model which predicts the dynamic behavior of the rotor. Finally experimental modal analysis of the rotor is performed with different support stiffnesses. The experimental and theoretical results have been compared and different support modeling approaches have been examined.

Lifetime Computational Models of Rolling Bearings in a 1.5MW Wind Turbine’s Epicyclic Gearbox

2012 ◽  
Vol 490-495 ◽  
pp. 1076-1080
Author(s):  
Xin Tan ◽  
Yao Li ◽  
Jun Jie Yang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Computational Model ◽  
Dynamic Model ◽  
Computational Models ◽  
Element Model ◽  
Rolling Bearings ◽  
Load Distributions ◽  
Multi Body

This paper introduces a computational model for calculating the lifetime of rolling bearings in a 1.5MW wind turbine’s epicyclic gearbox. At first, a quasi-dynamic model is established to analyze the skidding of bearings and the skew of rollers. Then, the load distributions on raceways and inner rings of bearings are calculated using the quasi-dynamic model. Meanwhile, a multi-body finite element model established in RomaxWind software is utilized to simulate and analyze dynamics behaviors of the epicyclic gearbox including all bearings. The comparison of bearings’ lifetimes calculated with different methods shows that the quasi-dynamic model can obtain very close results as the multi-body finite element model obtains, but costs less time. Failures occurring on inner and outer rings, such as pitting, adhesion, are mainly resulted from the misalignment of inner rings and roller number on the skidding of bearings

scholarly journals Finite Element Modeling and Vibration Analysis of Sprag Clutch-Flexible Rotor System

2020 ◽  
Author(s):  
chuang huang ◽  
yongqiang zhao ◽  
guanghu jin
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
High Speed ◽  
Element Model ◽  
Vibration Characteristics ◽  
Rotor System ◽  
Operating Conditions ◽  
Resonant Peak ◽  
Flexible Rotor ◽  
Calculation Results

Abstract To study the overall vibration characteristics of the sprag clutch-flexible rotor system (SC-FRS) under high-speed operating conditions, a finite element model of SC-FRS considering rotor flexibility and bearing support stiffness is established based on the proposed calculation method of the stiffness matrix. According to this model, the natural frequency and mode shape of the system are calculated, and the correctness of the model is verified by comparing it with the calculation results of ANSYS software. Under the action of unbalance, the bending-torsion coupled vibration and the dynamic load of the inter-shaft bearings are analyzed, and it is found that the resonant peak in the torsional direction has the same resonance frequency as that in the bending direction. A test rig for the sprag clutch-rotor system is built, and the axis trajectory and critical speed are tested. The test results show that the finite element model of SC-FRS can accurately describe the vibration characteristics of the system.

Finite Element Simulation of Tire-Rim Interface

1989 ◽  
Vol 17 (4) ◽  
pp. 305-325 ◽  
Author(s):  
N. T. Tseng ◽  
R. G. Pelle ◽  
J. P. Chang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Finite Element Simulation ◽  
Contact Pressure ◽  
Element Model ◽  
Experimental Measurements ◽  
Inflation Pressure ◽  
Interference Fit ◽  
Element Simulation ◽  
Rubber Composite

Abstract A finite element model was developed to simulate the tire-rim interface. Elastomers were modeled by nonlinear incompressible elements, whereas plies were simulated by cord-rubber composite elements. Gap elements were used to simulate the opening between tire and rim at zero inflation pressure. This opening closed when the inflation pressure was increased gradually. The predicted distribution of contact pressure at the tire-rim interface agreed very well with the available experimental measurements. Several variations of the tire-rim interference fit were analyzed.

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