Stiffness and geometry characteristics of flange connection with bolt failure and its influence on rotor dynamics

Liu, Yu; Zhao, Diwen; Guo, Xuanbo; Ai, Yanting

doi:10.1177/09544062221147405

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…Yu Liu [10] obtained the stiffness characteristics and shaft bending characteristics of flange connection after bolt failure via numerical simulation and experimental tests. The rotor motion equation with local stiffness asymmetry and initial bending characteristics caused by flange connection bolt failure was established.…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Disc–Drum Connection Bolt Preloading Rotor Assembly Modal Characteristics and Diagnosis Technology

Wang,

Xue,

Zhang

et al. 2024

Machines

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The drum rotor of an aero-engine is connected by one or multiple mounting edges through bolts, and their dynamics are significantly influenced by the preload state of the bolts. Long working hours in challenging environments can result in the deterioration of bolt pre-tightening during assembly or service, which impacts the rotor’s dynamic stability and overall performance. Currently, there are no available methods for detecting the dynamic characteristics of the drum connection components. This paper analyzes the impact of the natural characteristics of the drum composite structure of a high-pressure aero-engine turbine based on the refined finite element method when the preloading state changes. Two conditions of deviation and uneven stiffness distribution were applied to the connected components of the drum. The analysis focused on the impact of the pre-tightening state on its natural frequency. After analyzing the feasibility of identifying the pre-tightening state, two methods are proposed. These methods focus on changes in natural frequency and mode shape, specifically the sensitive natural frequency change method and the mode step change method. The methods proposed in this paper can serve as a reference for evaluating the quality of assembling complex disc–drum structures with multiple bolt connections.

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Section: Introductionmentioning

confidence: 99%

Research on the Influence of Disc–Drum Connection Bolt Preloading Rotor Assembly Modal Characteristics and Diagnosis Technology

Wang,

Xue,

Zhang

et al. 2024

Machines

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“…The review of the literature above indicates that it is necessary to study the stiffness characteristic of the flange joint with a spigot using the FE method and experiments, and establish the corresponding simplified analytical model for convenience of use. For this reason, based on the authors' previous finite element studies [25,28], an experimental instrument is built to study and verify the stiffness characteristics of the flange joint, and a simplified analytical model is proposed on this basis.…”

Section: Introductionmentioning

confidence: 99%

Stiffness Characteristics and Analytical Model of a Flange Joint with a Spigot

Liu,

Wang,

Liu

et al. 2023

Symmetry

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Flange joints with spigots are widely used in aero-engines. The spigot will restrict the shear slipping between flanges, which, in turn, affects the stiffness characteristics of the joint. The current model and research on flange joints without spigots may not be suitable for the dynamic characteristics of aero-engines. Moreover, the complexity of contact pairs limits the application of the flange joint finite element (FE) model in aero-engine dynamics analysis. Therefore, a simplified analytical model of a flange joint with a spigot is proposed in this paper. First, the stiffness characteristic of the flange joint with a spigot is studied using the FE method. Second, a corresponding experiment is executed to verify the result of the FE analysis. Furthermore, based on the former FE and experimental analysis, one section of a flange joint is simulated by the Jenkins friction model and a spring. Then, a simplified analytical model of the entire flange joint is built according to the different statuses of each section. Finally, a simulation analysis of the stiffness characteristic is performed. The result shows that the simplified analytical model can be utilized to describe the bending stiffness characteristic of the flange joint with a spigot.

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Static Nonlinear Modeling and Correction of Spring Element in Bolted Structure of Aeroengine

Zhao,

Li,

Cheng

et al. 2024

Lecture Notes in Mechanical Engineering

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Stiffness and geometry characteristics of flange connection with bolt failure and its influence on rotor dynamics

Cited by 6 publications

References 29 publications

Research on the Influence of Disc–Drum Connection Bolt Preloading Rotor Assembly Modal Characteristics and Diagnosis Technology

Research on the Influence of Disc–Drum Connection Bolt Preloading Rotor Assembly Modal Characteristics and Diagnosis Technology

Stiffness Characteristics and Analytical Model of a Flange Joint with a Spigot

Static Nonlinear Modeling and Correction of Spring Element in Bolted Structure of Aeroengine

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