A unified modeling approach for rotating flexible shaft-disk systems with general boundary and coupling conditions

Zhao, Shengnan; Zhang, Xuening; Zhang, Shengguang; Safaei, Babak; Qin, Zhaoye; Chu, Fulei

doi:10.1016/j.ijmecsci.2022.107073

Cited by 26 publications

(5 citation statements)

References 56 publications

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“…To ensure that the sleeve sufficiently creates contact pressure with the coupling during the first tightening process, it is necessary to apply a load that expands the sleeve at least as much as the existing gap. The internal pressure required to expand the sleeve by the gap can be calculated with respect to the maximum thickness of the sleeve using Equation ( 6) and then converted into an axial force through Equation (7).…”

Section: First Tightening Loadmentioning

confidence: 99%

“…The key distinction lies in their ability to address relative displacements between shafts, with rigid coupling lacking this capability and flexible coupling incorporating elastic elements to compensate for such displacements [2]. For this reason, flexible couplings have recently garnered significant attention, evidenced by a multitude of publications [3][4][5][6][7][8][9][10][11][12]. Nevertheless, flange coupling, a representative form of rigid coupling, remains a prevalent method for joining large shaft systems subjected to repeated high shear loads during shaft rotation, owing to its capacity to transmit substantial torque, coupled with a straightforward structure and cost-effectiveness [2].…”

Section: Introductionmentioning

confidence: 99%

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Integrated Design of Hydraulic Coupling Bolts for Large Shaft Systems

Park,

Lee,

Lee

et al. 2023

Applied Sciences

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Hydraulic coupling bolts are used in a wide range of industrial sectors, where ensuring the structural integrity and reliability of shaft systems is of paramount importance. However, research on systematic design methods for these specialized bolts is still lacking. In this study, an integrated design was used on hydraulic coupling bolts with M72 specification, considering both the tightening and untightening processes. First, the second tightening load was determined based on material strength, stress concentration and safety factors. Subsequently, the upper and lower limits of the first tightening loads were calculated using the thick-walled cylinder theory. An appropriate first tightening load maintaining the tightening force in both the axial and radial directions was obtained using finite element analysis. Design variables for the adapter configuration and oil passage shape were selected, and their impact on structural integrity was assessed using finite element analysis. The optimal combination of these design variables was derived. Finally, operational experiments for hydraulic coupling bolts were conducted according to the design results. The test results demonstrated a successful tightening and untightening process, confirming the effectiveness of the proposed design method.

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Section: First Tightening Loadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integrated Design of Hydraulic Coupling Bolts for Large Shaft Systems

Park,

Lee,

Lee

et al. 2023

Applied Sciences

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“…Subsequently, Du et al 20 proposed a tie-bolt rotor model considering the contact effect between adjacent disks based on the fractal contact theory and inquired into the effect of preload level on the response of the system. Zhao et al 21,22 established a mathematical model of a shaft-disk-drum rotor system with bolted joints based on the Lagrange equation and studied the effect of drum shape and joint parameters on the dynamic characteristic of the system. Yu et al 23 performed the simulation to study the effect of stiffness loss induced by the stick-slip behavior of spigot on the critical speed of bolted joint rotor system, showing that the stiffness loss would result in the critical speed of the system being reduced.…”

Section: Introductionmentioning

confidence: 99%

A parametric study of a bolted joint rotor-bearing system with an unbalanced offset disk

Zhu,

Li,

Wen

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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The turbine disk is the core component of an aero-engine whose position and unbalanced force seriously affect the vibration stability of the rotor system. Ignoring the influence of the offset disk may result in discrepancies between real-world scenarios and numerical simulation results. The present work aims to explore the nonlinear dynamic characteristics of rotor systems under the coupling of bolted joint and offset disk effect, as well as the influence of offset disk position and its unbalanced force on the system dynamic behavior and bending stiffness of bolted joint also investigated. The governing equations of a bolted joint rotor-bearing system with an offset disk were established based on the finite element method and derived as a dimensionless expression in the first. Then, the Newmark method was employed for the numerical solution of the motion equations, and then a bifurcation analysis of the rotor system and the evolution of bending stiffness for the bolted joint was studied. Next, by comparing the frequency-amplitude diagrams, bifurcation diagrams, time history, shaft obits, and bending stiffness diagrams of the bolted joint, the effect of the offset disk position and its unbalanced force on the nonlinear system dynamic was revealed. Finally, an experimental study was carried out to verify the numerical result using the bolted joint rotor test rig with an offset disk. The analysis result of the present work can provide theoretical guidance for structure design and stability analysis on the aero-engine.

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“…20,21,22 Wang et al 23 investigated chaos, jumping, and other complex nonlinear phenomena in the magnetorheological damper-rotor system, and found that the nonlinearity level can be alleviated effectively by applying an appropriate excitation current and oil supply pressure. Zhao et al 24,25 developed dynamic modeling methods to investigate the coupling vibrations of flexible shaft systems, and then studied the natural frequencies and dynamic responses of the rotor system. Current research on composite rotors is primarily focused on the linear dynamics, with specific focus on the natural frequencies and instability thresholds caused by internal damping.…”

Section: Introductionmentioning

confidence: 99%

Effect of laminate parameters on nonlinear dynamic characteristic of the composite rotor-bearing system with pedestal looseness

Yang,

Xuan,

Qin

et al. 2023

Advances in Mechanical Engineering

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The nonlinear dynamics of the composite shaft rotor-bearing system are greatly affected by the orientation angle layer and its proportion of the ply, i.e., the ratio of the orientation angle layer in the laminate. This paper presents a nonlinear dynamic analysis of a composite rotor-bearing system with pedestal looseness that considers the nonlinear oil film force and the pedestal looseness. Nonlinear phenomena including periodic, quasi-periodic, and chaotic motions are analyzed. The analysis results indicate that the stiffness and damping coefficients of a composite shaft tube can be influenced strongly by the laminate parameters, which can in turn affect the instability speed of the rotor system. To enhance the oil film instability speed of the composite rotor system, it is essential to maximize the ratio of the small orientation angle layer or the ±45° layer. Additionally, increasing the ratio of the small orientation angle layers in the shaft tube leads to a higher rotational speed for loosening instability. The research results obtained in this paper have important theoretical value for the design of composite rotor-bearing systems.

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A unified modeling approach for rotating flexible shaft-disk systems with general boundary and coupling conditions

Cited by 26 publications

References 56 publications

Integrated Design of Hydraulic Coupling Bolts for Large Shaft Systems

Integrated Design of Hydraulic Coupling Bolts for Large Shaft Systems

A parametric study of a bolted joint rotor-bearing system with an unbalanced offset disk

Effect of laminate parameters on nonlinear dynamic characteristic of the composite rotor-bearing system with pedestal looseness

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