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Article
Engineering, Mechanical
Jie Hong et al.
Summary: This paper investigates the combination resonances of bolted rotor systems with asymmetric preloads under multi-frequency excitation and proposes a new breathing model. Theoretical and experimental studies demonstrate that combination resonances could occur in practical dual rotor systems near specific frequencies.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Multidisciplinary
Shengnan Zhao et al.
Summary: A dynamic modeling method is proposed for shaft-disk-drum (SDM) rotor systems with elastic connections and supports, and the coupling vibrations of disk, drum and shaft are investigated. The motion equations for flexible SDM rotor systems are derived using Lagrange equation by expanding displacement fields with orthogonal polynomials obtained by Gram-Schmidt process. The proposed modeling approach is verified and can be applied to more complex configurations.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Mechanical
K. Prabith et al.
Summary: This paper proposes a numerical method to capture the nonlinear dynamic characteristics of an aero-engine rotor system undergoing multi-disk rub-impact, and studies the steady-state response of the system using model reduction and semi-analytic techniques. It is found that under multi-disk rub-impact, the response characteristics and stability of the system are significantly affected, leading to various types of whirl motions.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Cunjian Zou et al.
Summary: This paper analyzes the feasibility of the identification method for the pre-tightening state of the mating surface based on vibration theory. It also studies the influence of the pre-tightening state change on the rotor dynamic characteristics through finite element method and experimental method. Three identification methods for the pre-tightening state of the mating surface are proposed to solve engineering problems caused by improper assembly or harsh environment.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
Shengnan Zhao et al.
Summary: A unified modeling approach for investigating the general coupling vibrations of rotating flexible shaft-disk systems is developed in this study. The method considers the effects induced by rotation and utilizes artificial springs to represent boundary and coupling conditions, obtaining motion equations for flexible shaft-disk systems. The approach overcomes the deficiencies of existing methods and can be extended to complex rotor systems.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Mechanics
Runchao Zhao et al.
Summary: This paper proposes a modified contact model for the gas turbine rotor system, which considers the effect of elastoplastic deformation and is compared with verified experimental results. By introducing an equivalent material layer, a finite element model is established and the dynamic response of the rotor system is solved using the Newmark-fl method. The results show that the proposed contact model accurately reflects the actual contact state and the preload amount leads to the appearance of multiple combined frequency components.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2022)
Article
Acoustics
Lei Li et al.
Summary: This paper proposes a method for identifying the unbalance value of full-size rotor systems through scaling laws and scaled models. The effectiveness of the method is verified through numerical and experimental case studies, and the results show that the unbalance values can be accurately identified.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Mechanical
Haopeng Zhang et al.
Summary: This paper establishes a rotor system model with cubic supporting stiffness and looseness fault using the Lagrange method. The dynamic response of the double disk rotor system is solved using HB and RK methods, with the accuracy of HB method justified in comparison to the RK method. Experimental results validate the accuracy of theoretical and numerical results in capturing the main nonlinear behaviors of looseness fault and nonlinear supporting stiffness.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Tianrui Yang et al.
Summary: In this paper, a finite element model is established to analyze the effects of rotating-flexible shaft-disk-drum system with bolted joints. The model takes into account rotation-induced effects and is validated by literature and experiments. Several conclusions are drawn regarding the natural characteristics of the SDR system.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Rui Yang et al.
Summary: This study analyzed the influence of resonance characteristics and rotor eccentric excitation on the fault characteristic frequencies of a bearing-rotor system running in flexible bearing supports. The results showed that resonance characteristics and rotor eccentric excitation have different effects on the quality of bearing fault vibration signals at different speeds.
MECHANISM AND MACHINE THEORY
(2022)
Article
Engineering, Mechanical
Kai Sun et al.
Summary: This paper investigates the variable stiffness of an elastic ring-supported rotor system, proposes a mathematical model, and verifies it through experiments. It also analyzes the effects of variable stiffness on the dynamic characteristics and critical speed of the rotor system.
NONLINEAR DYNAMICS
(2022)
Article
Mechanics
Yuqi Li et al.
Summary: This study investigates the nonlinear vibration properties of a rotor-bearing system with a multi-disk bolted joint under a fixed-point rubbing fault. A mathematical model is developed to analyze the effect of rub-impact positions on the system's nonlinear dynamics. Numerical simulations are used to examine the dynamic behavior of the system under different rubbing fault positions and investigate its chaotic response.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2022)
Article
Engineering, Mechanical
Yuqi Li et al.
Summary: This study focuses on the dynamic characteristics of the bolted joint rotor system and the coupling effect of rubbing and bolted joint on rotor dynamics. By establishing a dynamic model and conducting experimental research, the impact of rotor-stator rub on the vibration characteristics of the rotor system and the influence of the radial stiffness of the stator on the mechanical properties of the bolted joint and rotor dynamics are revealed.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Multidisciplinary
Pingchao Yu et al.
Summary: This study proposed a new analytical model of bolted joint to effectively describe the joint's nonlinearity and damping. The bolted joint mainly causes stiffness loss and damping nonlinearity in the rotor system, which can be reduced by decreasing flange length, friction coefficient, and interference fit of the spigot.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Acoustics
Yuqi Li et al.
Summary: This study investigates the dynamic modeling of rotating machinery using a nonlinear autoregressive (NARX) model with external inputs. A new modeling method called the frequency sweep system identification approach is proposed to establish a single-input single-output (SISO) NARX model for rotating machinery over a wide range of rotational speeds. The feasibility of the proposed modeling approach is validated through numerical and experimental cases, providing a modeling basis for the analysis and design of rotating machinery.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Mechanics
Xianglin Wu et al.
Summary: The study established a dynamic model of the rod-fastening rotor-bearing system and analyzed the influence of various factors on the nonlinear dynamic characteristics of the system. The results showed that increasing the pre-tightening load can increase contact stiffness, while increasing rod diameter can delay partial separation of contact surfaces. Uneven pre-tightening load significantly affects the fluctuation of stiffness coefficients and can lead to self-excited vibration frequencies. The number of rods, rod diameter, and contact surface roughness also impact the system's dynamic characteristics.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Acoustics
Yulin Jin et al.
Summary: This study investigates the nonlinear vibration characteristics of a dual-rotor-bearing-coupling misalignment system with blade-casing rubbing through numerical simulation and experimental measurement. By establishing a dynamic model and reducing the model order, the results show that the numerical and experimental results are consistent, revealing the nonlinear vibration characteristics of the system.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Mechanical
K. Prabith et al.
Summary: This paper investigates the influence of rub parameters on the stability of a two-spool rotor system undergoing rub-impact. It explores the effects of rotor-stator contact stiffness, coefficient of friction, and clearance on system response and stability, and observes different responses between co-rotation and counter-rotation modes. Increasing friction coefficient leads to early onset of bifurcations, while higher contact stiffness and clearance delay bifurcation onset. The response characteristics of co-rotating and counter-rotating systems are found to be distinct, with counter-rotating systems entering the quasi-periodic regime more rapidly.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Seyed-Ehsan Mir-Haidari et al.
Summary: Efficient testing protocols were developed in this research for accurate detection and quantification of nonlinearities in aeroengine casing assemblies. The integration of theoretical FE modelling techniques with advanced experiment formulations resulted in significantly improved time efficiency and accuracy in nonlinear testing.
NONLINEAR DYNAMICS
(2021)
Article
Mechanics
Longkai Wang et al.
Summary: This study investigates the nonlinear dynamic characteristics of a rod fastening rotor-bearing system with internal damping through mathematical modeling and simulations. The results show that internal damping has both low-speed attenuation and high-speed amplification effects on nonlinear dynamic response, and reduces the instability threshold. Therefore, internal damping must be strictly considered in dynamic modeling and analysis of complex rotors.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Engineering, Mechanical
Tian Gao et al.
Summary: This paper focuses on the dynamic phenomena, physical mechanism, and occurrence conditions of paroxysmal impulse vibrations in a dual-rotor system with an inter-shaft bearing defect. The study reveals that the occurrence of paroxysmal impulse vibrations is closely related to the relationship between the rotation frequency of the high-pressure rotor and the defect frequencies of the dual-rotor system.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Yuqi Li et al.
Summary: This study proposes a bolted-disk joint element that considers dynamic parameters and establishes a dynamic model for rotor systems with bolted-disk joints. The research uses numerical methods and graphical analyses to study the system's dynamic behavior under different stiffness conditions, and also examines the influence of bending stiffness of bolted disk joints on system response.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Xumin Guo et al.
FRONTIERS OF MECHANICAL ENGINEERING
(2020)
Article
Engineering, Mechanical
Wei Sun et al.
ENGINEERING FAILURE ANALYSIS
(2020)
Article
Mechanics
Yang Yang et al.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2020)
Article
Engineering, Mechanical
Yang Yang et al.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2020)
Article
Engineering, Mechanical
Yang Yang et al.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Acoustics
Tikam Chand Gupta
JOURNAL OF VIBRATION AND CONTROL
(2019)
Article
Engineering, Aerospace
Jin Zeng et al.
AEROSPACE SCIENCE AND TECHNOLOGY
(2019)
Article
Engineering, Aerospace
Roque Corral et al.
AEROSPACE SCIENCE AND TECHNOLOGY
(2018)
Article
Acoustics
Mian Jiang et al.
JOURNAL OF SOUND AND VIBRATION
(2017)
Article
Engineering, Mechanical
Zhaoye Qin et al.
ENGINEERING FAILURE ANALYSIS
(2016)
Article
Engineering, Mechanical
Loic Salles et al.
NONLINEAR DYNAMICS
(2016)
Article
Engineering, Mechanical
Kuan Lu et al.
NONLINEAR DYNAMICS
(2015)
