Dynamic characteristics investigation of a dual rotor-casing system considering the comprehensive stiffness of the intermediate bearing
•A comprehensive stiffness model of intermediate bearing is presented.•A reduced model of dual rotor-bearing-casing coupling system is developed.•The effects of typical parameters on the vibration of the system are discussed.•The mechanism of the comprehensive stiffness and system vibration is revea...
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Published in | Journal of sound and vibration Vol. 578; p. 118355 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
26.05.2024
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Abstract | •A comprehensive stiffness model of intermediate bearing is presented.•A reduced model of dual rotor-bearing-casing coupling system is developed.•The effects of typical parameters on the vibration of the system are discussed.•The mechanism of the comprehensive stiffness and system vibration is revealed.
This paper focuses on the vibrational properties of a dual rotor-casing coupled system with nonlinear clearance in the intermediate bearing, considering both the oil film stiffness and Hertzian contact stiffness between rolling elements and raceways. A comprehensive stiffness model for the intermediate bearing has been developed based on elastohydrodynamic lubrication (EHL) and Hertz contact theory. Subsequently, a dynamical model of the dual rotor-bearing-casing system is established using the finite element method, thereby verifying the feasibility of simulating the casing with beam elements. The dimensionality of the system equation is reduced using the fixed-interface component mode synthesis (CMS) method, and the resulting reduced-dimensionality equation is solved using the improved Newmark-β method. The effects of casing support, rotational speed, and radial clearance on the vibration characteristics of the system are investigated. Then, the comprehensive stiffness and coupled vibration characteristics of the system are analyzed to elucidate its intrinsic mechanism. Finally, the contact characteristics within the intermediate bearing under dynamic load are also studied. The results indicate that the support stiffness of the casing has a more significant impact on the second resonance caused by both the inner and outer rotors. The system is prone to experiencing varying compliance (VC) resonance at low rotational speeds. The excessive bearing clearance leads to complex vibrational characteristics of the system, making it challenging to predict its motion. The impact of minor changes in stiffness on system vibration is small when the comprehensive stiffness is large. At this time, the limited effect of oil film stiffness allows it to be disregarded in terms of comprehensive stiffness. Furthermore, the speed significantly influences the contact characteristics within the intermediate bearing under the unbalanced force of the rotor and gravity. |
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AbstractList | •A comprehensive stiffness model of intermediate bearing is presented.•A reduced model of dual rotor-bearing-casing coupling system is developed.•The effects of typical parameters on the vibration of the system are discussed.•The mechanism of the comprehensive stiffness and system vibration is revealed.
This paper focuses on the vibrational properties of a dual rotor-casing coupled system with nonlinear clearance in the intermediate bearing, considering both the oil film stiffness and Hertzian contact stiffness between rolling elements and raceways. A comprehensive stiffness model for the intermediate bearing has been developed based on elastohydrodynamic lubrication (EHL) and Hertz contact theory. Subsequently, a dynamical model of the dual rotor-bearing-casing system is established using the finite element method, thereby verifying the feasibility of simulating the casing with beam elements. The dimensionality of the system equation is reduced using the fixed-interface component mode synthesis (CMS) method, and the resulting reduced-dimensionality equation is solved using the improved Newmark-β method. The effects of casing support, rotational speed, and radial clearance on the vibration characteristics of the system are investigated. Then, the comprehensive stiffness and coupled vibration characteristics of the system are analyzed to elucidate its intrinsic mechanism. Finally, the contact characteristics within the intermediate bearing under dynamic load are also studied. The results indicate that the support stiffness of the casing has a more significant impact on the second resonance caused by both the inner and outer rotors. The system is prone to experiencing varying compliance (VC) resonance at low rotational speeds. The excessive bearing clearance leads to complex vibrational characteristics of the system, making it challenging to predict its motion. The impact of minor changes in stiffness on system vibration is small when the comprehensive stiffness is large. At this time, the limited effect of oil film stiffness allows it to be disregarded in terms of comprehensive stiffness. Furthermore, the speed significantly influences the contact characteristics within the intermediate bearing under the unbalanced force of the rotor and gravity. |
ArticleNumber | 118355 |
Author | Wang, Donghua Zhang, Qingchun Shi, Xiujiang Liu, Kunpeng Li, Wanyou |
Author_xml | – sequence: 1 givenname: Kunpeng orcidid: 0000-0002-1559-381X surname: Liu fullname: Liu, Kunpeng – sequence: 2 givenname: Donghua orcidid: 0000-0002-2705-539X surname: Wang fullname: Wang, Donghua email: wangdonghua@hrbeu.edu.cn – sequence: 3 givenname: Wanyou surname: Li fullname: Li, Wanyou – sequence: 4 givenname: Xiujiang surname: Shi fullname: Shi, Xiujiang – sequence: 5 givenname: Qingchun surname: Zhang fullname: Zhang, Qingchun |
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Keywords | Contact characteristic Dual rotor-casing system Intermediate bearing Comprehensive stiffness |
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SubjectTerms | Comprehensive stiffness Contact characteristic Dual rotor-casing system Intermediate bearing |
Title | Dynamic characteristics investigation of a dual rotor-casing system considering the comprehensive stiffness of the intermediate bearing |
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