The influence of rotor-stator contact on the nonlinear vibration of an asymmetrical rotor

Ali Fasihi; Majid Shahgholi; Grzegorz Kudra; Maryam GhandchiTehrani; Jan Awrejcewicz

doi:10.1007/s11071-025-11525-1

The influence of rotor-stator contact on the nonlinear vibration of an asymmetrical rotor

Ali Fasihi^*
, Majid Shahgholi
, Grzegorz Kudra^*
, Maryam GhandchiTehrani
, Jan Awrejcewicz

^*Corresponding author for this work

Dynamics and Vibration

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

This study investigates the nonlinear vibration behavior of an asymmetric rotor subjected to rotor-stator contact effects. The rotor is mounted on elastic supports and excited by an unbalanced force arising from the eccentricity of its center of gravity. The governing equations of motion are derived using Hamilton’s principle and Rayleigh beam theory, incorporating geometric and inertial nonlinearities due to shaft inextensibility. Numerical solutions reveal complex dynamic behaviors, including transitions among periodic, period-n, and chaotic motions. Bifurcation diagrams and phase portraits are utilized to explore the influence of key system parameters, such as rotational speed, contact stiffness, damping coefficient, and asymmetry.

Original language	English
Pages (from-to)	27435–27457
Number of pages	23
Journal	Nonlinear Dynamics
Volume	113
Early online date	16-Jul-2025
DOIs	https://doi.org/10.1007/s11071-025-11525-1
Publication status	Published - Oct-2025

Keywords

rotor-stator contact
asymmetric rotor
bifurcation
period-n motion

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title = "The influence of rotor-stator contact on the nonlinear vibration of an asymmetrical rotor",

abstract = "This study investigates the nonlinear vibration behavior of an asymmetric rotor subjected to rotor-stator contact effects. The rotor is mounted on elastic supports and excited by an unbalanced force arising from the eccentricity of its center of gravity. The governing equations of motion are derived using Hamilton{\textquoteright}s principle and Rayleigh beam theory, incorporating geometric and inertial nonlinearities due to shaft inextensibility. Numerical solutions reveal complex dynamic behaviors, including transitions among periodic, period-n, and chaotic motions. Bifurcation diagrams and phase portraits are utilized to explore the influence of key system parameters, such as rotational speed, contact stiffness, damping coefficient, and asymmetry.",

keywords = "rotor-stator contact, asymmetric rotor, bifurcation, period-n motion",

author = "Ali Fasihi and Majid Shahgholi and Grzegorz Kudra and Maryam GhandchiTehrani and Jan Awrejcewicz",

year = "2025",

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doi = "10.1007/s11071-025-11525-1",

language = "English",

volume = "113",

pages = "27435–27457",

journal = "Nonlinear Dynamics",

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TY - JOUR

T1 - The influence of rotor-stator contact on the nonlinear vibration of an asymmetrical rotor

AU - Fasihi, Ali

AU - Shahgholi, Majid

AU - Kudra, Grzegorz

AU - GhandchiTehrani, Maryam

AU - Awrejcewicz, Jan

PY - 2025/10

Y1 - 2025/10

N2 - This study investigates the nonlinear vibration behavior of an asymmetric rotor subjected to rotor-stator contact effects. The rotor is mounted on elastic supports and excited by an unbalanced force arising from the eccentricity of its center of gravity. The governing equations of motion are derived using Hamilton’s principle and Rayleigh beam theory, incorporating geometric and inertial nonlinearities due to shaft inextensibility. Numerical solutions reveal complex dynamic behaviors, including transitions among periodic, period-n, and chaotic motions. Bifurcation diagrams and phase portraits are utilized to explore the influence of key system parameters, such as rotational speed, contact stiffness, damping coefficient, and asymmetry.

AB - This study investigates the nonlinear vibration behavior of an asymmetric rotor subjected to rotor-stator contact effects. The rotor is mounted on elastic supports and excited by an unbalanced force arising from the eccentricity of its center of gravity. The governing equations of motion are derived using Hamilton’s principle and Rayleigh beam theory, incorporating geometric and inertial nonlinearities due to shaft inextensibility. Numerical solutions reveal complex dynamic behaviors, including transitions among periodic, period-n, and chaotic motions. Bifurcation diagrams and phase portraits are utilized to explore the influence of key system parameters, such as rotational speed, contact stiffness, damping coefficient, and asymmetry.

KW - rotor-stator contact

KW - asymmetric rotor

KW - bifurcation

KW - period-n motion

U2 - 10.1007/s11071-025-11525-1

DO - 10.1007/s11071-025-11525-1

M3 - Article

SN - 0924-090X

VL - 113

SP - 27435

EP - 27457

JO - Nonlinear Dynamics

JF - Nonlinear Dynamics

ER -

The influence of rotor-stator contact on the nonlinear vibration of an asymmetrical rotor

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Keywords

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