Nonlinear vibration analysis of rotors supported by ball bearings

Download

index.pdf

Date

2019

Author

Bahan, Doğancan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

226
views

131
downloads

Performance of ball bearing-rotor systems is highly dependent on and often limited by characteristics of ball bearings. Ball bearings are nonlinear by their nature and this nonlinearity must be investigated rigorously to correctly predict vibration response of the system. The steady-state periodic response of rotor systems with nonlinear ball bearings is investigated. The rotor is modeled with the Finite Element Method. Nonlinear model for the bearings considers finite number of balls, bearing clearance and contact between balls and races. The nonlinear differential equation of motion is converted to a nonlinear algebraic equation set by Harmonic Balance Method. Receptance Method is applied to decrease the number of nonlinear equations to be solved. Newton’s Method with arc-length continuation is used to solve the resulting equation set. Case studies are performed to investigate bearing vibrations such as varying compliance resonance, response to unbalance and interaction of flexible rotor-bearing vibrations.

Subject Keywords

Rotors, Rotors Bearings., Rotor-bearing systems, varying compliance

URI

http://etd.lib.metu.edu.tr/upload/12624328/index.pdf
https://hdl.handle.net/11511/44503

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Nonlinear Dynamic Analysis of an Asymmetric Ball Bearing Rotor System Bahan, Doğancan; Ciğeroğlu, Ender (2019-11-14) Performance of ball bearing–rotor systems are highly dependent on and often limited by characteristics of ball bearings. Several studies are available in the literature, investigating varying compliance and subharmonic resonances of ball bearings. Most of the studies are carried out with rigid rotors to focus on modelling of the bearings. There exist few studies which take flexibility of rotors into account. Furthermore, even if the rotor flexibility is modelled, most of the time symmetrical rotors are cons...
Development of load distribution model and micro-geometry optimization of four-point contact ball bearings Yılmaz, Sinan; Akkök, Metin; Department of Mechanical Engineering (2018) The unique kinematic characteristics and load-carrying capabilities of four-point contact ball bearings make these bearings being widely used in demanding applications. Particularly, four-point contact ball bearings are preferred due to their reverse axial load carrying capability and high level of stability. In this study, micro and macro geometrical aspects of these bearings are investigated and compared with the conventional ball bearings. Once the geometry and internal kinematics of four-point contact b...
Dynamic characterization of bolted joints using FRF decoupling and optimization Tol, Serife; Özgüven, Hasan Nevzat (2015-03-01) Mechanical connections play a significant role in predicting dynamic characteristics of assembled structures. Therefore, equivalent dynamic models for joints are needed. Due to the complexity of joints, it is difficult to describe joint dynamics with analytical models. Reliable models are generally obtained using experimental measurements. In this paper an experimental identification method based on FRF decoupling and optimization algorithm is proposed for modeling joints. In the method the FRFs of two subs...
A non-linear mathematical model for dynamic analysis of spur gears including shaft and bearing dynamics Özgüven, Hasan Nevzat (Elsevier BV, 1991-3) A six-degree-of-freedom non-linear semi-definite model with time varying mesh stiffness has been developed for the dynamic analysis of spur gears. The model includes a spur gear pair, two shafts, two inertias representing load and prime mover, and bearings. As the shaft and bearing dynamics have also been considered in the model, the effect of lateral-torsional vibration coupling on the dynamics of gears can be studied. In the non-linear model developed several factors such as time varying mesh stiffness an...
Lateral Response Comparison of Unbonded Elastomeric Bearings Reinforced with Carbon Fiber Mesh and Steel Naghshineh, Ali Karimzadeh; Akyüz, Uğurhan; Caner, Alp (2015-01-01) The vertical and horizontal stiffness used in design of bearings have been established in the last few decades. At the meantime, applicability of the theoretical approach developed to estimate vertical stiffness of the fiber-reinforced bearings has been verified in different academic studies. The suitability of conventional horizontal stiffness equation developed for elastomeric material, mainly for steel-reinforced elastomeric bearings, has not been tested in detail for use of fiber-reinforced elastomeric ...

Citation Formats

D. Bahan, “Nonlinear vibration analysis of rotors supported by ball bearings,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Mechanical Engineering., Middle East Technical University, 2019.