Effect of Stator dynamics on the Chaotic Behavior of Rotor-Disk-Bearing System under Rub-Impact between Disk and Stator

Rahi, Abbas; Haghani, Ahmad; Safarpour, Pedram

doi:10.22060/ajme.2019.14979.5754

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	Effect of Stator dynamics on the Chaotic Behavior of Rotor-Disk-Bearing System under Rub-Impact between Disk and Stator
Article 11, Volume 4, Issue 1, Winter and Spring 2020, Page 101-110 PDF (1317 K)
Document Type: Research Article
DOI: 10.22060/ajme.2019.14979.5754
Authors
Abbas Rahi ; Ahmad Haghani; Pedram Safarpour
Faculty of Mechanical & Energy Engineering, Shahid Beheshti University
Abstract
In the present study, the effect of stator dynamics on the chaotic behavior of a rotor-disk-bearing system with rub-impact between disk and stator is investigated. The governing equations of motion are derived using Jeffcott model and Newton's second law and then are made dimensionless. Governing Equations are also achieved utilizing the Short Bearing Theory and considering nonlinear forces acting on the oil film. Furthermore, unbalance force and bow shaft force which cause rub-impact between disk and stator are considered in the equations of motion. In the beginning, the system is modeled regardless of stator dynamics, and then the stator dynamics is also considered in the modeling of the system. In both cases, the system behavior is studied by bifurcation diagrams, time series diagrams, phase plane diagrams, power spectrum diagrams, Poincaré maps, and maximum Lyapunov exponent, respectively. The obtained results show that the type of stator dynamics modeling has a significant effect on the prediction of the response of a disk-bearing system with rub-impact between disk and stator. In other words, the results show the system has a chaotic behavior without considering the dynamics of the stator in mathematical modeling, while in the case of considering the stator dynamics and using the suitable values for the stator stiffness, the motion behavior of the system can be changed from the chaotic to the regular and periodic motion. Keywords: Rotor-disk-bearing, stator dynamics, rub-impact, chaotic behavior.
Keywords
Rotor-disk-bearing; stator dynamics; rub-impact; chaotic behavior
Main Subjects
Modeling of Dynamical System; Nonlinear Vibration


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