Related references
Note: Only part of the references are listed.
Article
Engineering, Mechanical
Zhongliang Xie et al.
Summary: The high temperature liquid Lead-Bismuth (PbBi) solution lubricated bearing plays a crucial role in the two-circuit main loop system of nuclear power stations. This study developed revised dynamic lubrication models considering cavitation effects and investigated the influences of clearances, rotating speeds, eccentricity ratios, and annular guiding grooves on the hydrodynamic characteristics. The results confirm the relationship between peak pressure, speeds, and eccentricity ratios, as well as the impact of clearances on maximum/minimum pressure. Theoretical analysis coincided with experimental data, verifying the rationality and correctness of the lubrication models.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
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Zhongliang Xie et al.
Summary: This study presents a breakthrough in the performance of load increase, drag reduction, vibration decrease and noise containment through the design of a double-liner bearing structure. By constructing a fluid-structure-acoustic interaction hydrodynamic model and analyzing the lubrication performances considering cavitation effects and sound radiation, the study investigates the fluid-structure-acoustic characteristics and sound radiation laws with different material combinations, as well as the effects of operating conditions on deformation and stress. The results show a close relationship between acoustic performances and material combinations.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Zhongliang Xie et al.
Summary: This paper proposes a novel double-liner bearing to overcome the disadvantages of traditional water-lubricated single-liner bearings, aiming for breakthroughs in high-load, low-resistance, vibration attenuation, and noise reduction performances. By establishing a fluid-structure interaction dynamic model of the sandwich liner bearing and considering turbulent effects, the influences of eccentricity ratios and liner thickness on lubrication performance are studied, revealing the evolution mechanisms of liner thickness on lubrication performances. The results demonstrate superior lubrication behaviors in the sandwich liner bearing. This study enriches the theoretical systems of lubrication and provides new ideas and approaches for bearing design and R&D, which is of significant importance.
TRIBOLOGY INTERNATIONAL
(2023)
Review
Engineering, Mechanical
Zhongliang Xie et al.
Summary: This paper provides a detailed summary of water-lubricated bearings in five typical aspects: lubrication regime, fluid-solid interaction (FSI), thermal effect, tribological behaviors, and vibration-noise performances. It extracts and acquires the influencing factors, judgement criteria, and lubrication mechanism of the lubrication regime. The methodology and parameters influencing temperature rise are summarized. The generation mechanism of tribological behaviors and vibration & noise is obtained. The paper systematically combs and summarizes the theories and methods of water-lubricated bearings, pointing out the existing problems and urgent technologies that need to be solved. The findings can serve as a distinct theoretical and methodological reference for further investigation on water-lubricated bearings.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Xinxing Ma et al.
Summary: This study focuses on the effective suppression of large-amplitude self-excited vibrations in spline-shafting systems using a nonlinear energy sink (NES). The study develops a nonlinear dynamic model for the system and explores the mechanism of friction-induced vibration and instability. The results show that the NES can effectively reduce vibration and alleviate large-amplitude self-excited vibration, providing guidance for the dynamic design of complex rotor systems.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Huaitao Shi et al.
Summary: This paper proposes a novel digital twin (DT) model for dynamical updating and real-time mapping of local defect extension in rolling bearings. The model combines mechanism models and real-time sensor data to directly map the full life-cycle defect sizes. The XJTU-SY bearing dataset is applied to assess the accuracy of the novel DT model in characterizing the local defect extension of the full life-cycle in rolling bearings.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Zhongliang Xie et al.
Summary: Traditional water-lubricated bearings face challenges in forming effective lubricating film under extreme low-speed and heavy-duty conditions, leading to shortcomings such as low-load, high-resistance, high-vibration, and high-noise. The paper proposes a novel multi-field coupling lubrication model to investigate the mixed lubrication performances and critical characteristics of these bearings. By developing functional mapping relationships and building rotor dynamic models, the paper reveals the variation mechanisms of dynamic behaviors and verifies the correctness of the model and algorithm through theoretical analysis and experiment. The academic value of this research is expected to achieve a novel breakthrough in forming effective hydrodynamic film under extreme severe conditions for water-lubricated bearings.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Fangcheng Xu et al.
Summary: This study improves the stiffness of air foil bearings by using an external gas supply method. By adjusting the gas supply pressure, the vibration characteristics of the bearing-rotor system can be actively controlled to adapt to changing operating conditions.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Zhongliang Xie et al.
Summary: This paper investigates the lubrication mechanisms of a novel water-lubricated bearing considering thermal effect. A revised thermodynamic lubrication model with FSI and thermal methodology is built, and the static characteristic parameters of water-film and the variation laws of the liner are studied. The effects of rotational speeds, eccentricity ratios, and liner thickness on thermal performances are analyzed, and the internal mechanisms of the large temperature difference are revealed. Results provide theoretical support for the design and application of such bearings and enrich the theoretical systems of lubrication regime.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Multidisciplinary
Wujiu Pan et al.
Summary: This paper investigates the impact of high maneuverability on the rotor system of fighter aircraft, and establishes corresponding system models for analysis. By comparing the system responses under different maneuvering loads, it reveals the differences in potential risks and frequency components under different maneuvers. The research results provide a cognitive basis for the mechanism of system rubbing faults under different maneuvers.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Aerospace
Yongfeng Wang et al.
Summary: This paper studies the coupling vibration characteristics between the rotor and supporting structure, as well as the dynamic stiffness of the supporting structure. The research shows that the dynamic stiffness of the supporting structure is influenced by both the structural parameters and the frequency of the excitation force. When the excitation frequency is high and close to the resonance frequency, the dynamic stiffness may decrease sharply, leading to the generation of more resonance frequencies and changes in the critical speed.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Mechanics
Hussein Sayed et al.
Summary: Investigating the dynamics and stability of flexible rotors supported by journal bearings is crucial in designing efficient and reliable rotating machines. This study examines a model of a flexible rotor supported by two symmetric journal bearings. The nonlinear bearing forces are evaluated using either a direct solution of the Reynolds equation or analyzing it to obtain linear and nonlinear bearing stiffness and damping coefficients. These coefficients are obtained for different operating conditions and bearing parameters. The results are validated with previous literature and a perturbation analysis is used to investigate the validity range of the bearing coefficients. A novel technique based on polynomial fitting is used to represent the bearing coefficients as a function of the bearing parameters, enabling the study of the dynamics of the flexible rotor model using numerical continuation techniques. The effect of bearing design parameters on system stability, such as groove angle, length to diameter ratio, and static pressure, is also investigated.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2022)
Article
Engineering, Mechanical
Zhongliang Xie et al.
Summary: The paper investigates the static and dynamic lubrication parameters of the floating ring bearing (FRB) by proposing modified lubrication models and utilizing multiscale methods to enhance calculation accuracy and efficiency. The study analyzes the influence of various factors on lubrication performances and concludes that the clearance ratio affects the inner oil film while the vertical load influences the bearing's lubrication performances. These conclusions are applicable to similar floating ring bearings.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Yi Zhang et al.
Summary: The study investigates the potential unstable vibration phenomena of the floating-ring bearing supported turbocharger rotor system in high-speed and high-temperature environments. A numerical model is used to analyze its nonlinear vibration behavior and a method to avoid fluid-induced instability is proposed.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Mechanics
Bin Chen et al.
Summary: This paper studies the sub-harmonic and super-harmonic periodic motions, eigenvalue dynamics, and period doubling bifurcation tree of a nonlinear rotor system. The study applies an implicit discrete mapping method and proposes a thirteen-parameter polynomial oil film force model to accurately reveal the system's dynamic characteristics.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2022)
Article
Engineering, Mechanical
Jaroslav Zapomel et al.
Summary: The paper presents a new design concept for a hydrodynamic bearing lubricated by composite magnetic fluids. The mathematical model and computational procedures were developed to study the behavior and performance of the bearing. The research shows that increasing the magnetic induction in the bearing gap improves the bearing load capacity and centers the journal. The advantage of this bearing is its semiactive operation principle.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Zhongliang Xie et al.
Summary: This study investigates the fluid structure interaction (FSI) dynamic behaviors of water-lubricated bearings with axial asymmetric grooves. Revised FSI models considering cavitation and turbulent effects are proposed. The simulations are consistent with existing literature and experimental data, confirming the accuracy of the model. The effects of groove types and locations on dynamic behaviors are systematically explored, showing that the separation effects of the local asymmetric grooves coupled with the rotation effects enhance the hydrodynamic effects, leading to increased maximum pressure values and load carrying capacity (LCC).
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Shouan Chen et al.
Summary: This paper investigates the impact of imperfect journal on the tribo-dynamic behavior of water-lubricated bearings during start-up. The numerical model shows that the shape error of the journal can affect the performance of the bearing, but within a reasonable range, it can also improve the tribological performance.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Marine
Qianwen Huang et al.
Summary: An appropriate assessment of the dynamical response of the marine propeller shaft is crucial for optimal power delivery to the propeller and minimizing unnecessary mechanical friction of supporting bearings. This study proposes a numerical model to analyze friction-induced vibration with velocity-dependent and stick-slip friction, and validates a Newton-Raphson & Newmark-fl solving method to solve the nonlinear model. The response of the dynamic friction coefficient, relative velocity, and reaction force are obtained, and an optimized design for the propeller shaft and supporting bearings is achieved based on the proposed numerical model.
Article
Engineering, Mechanical
Zhaogang Jing et al.
Summary: This paper investigates the interface effect in the lubrication performance of a step slider bearing through experimental and theoretical studies. It is found that the oleophobic F-DLC coating on the step slider increases the film thickness/load-carrying capacity and decreases the coefficient of friction. Contact angle measurements show that the inlet step surface has lower affinity to the lubricant compared to the outlet land due to surface roughness. Theoretical analyses reveal that different interfacial slip velocities on the inlet step and the outlet land can lead to changes in the load-carrying capacity and the COF.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Hongyang Xu et al.
Summary: This study proposes a novel dynamic model of the bearing-rotor system, considering the inner ring dynamic misalignment and incorporating nonlinearity and axial restraint. The accuracy of the model is verified through experimentation, and the effects of misalignment angle, radial clearance, and rotational speed on system dynamic characteristics are analyzed.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Multidisciplinary
Yang Kang et al.
Summary: This paper proposes a novel estimation method for accurately estimating the time-varying dynamic coefficients (TVDCs) of journal bearings without the need for a tachometer. The method combines a phase-based approach to extract the instantaneous angular speed and an iteration strategy based on the square-root cubature Kalman filter (SRCKF) to estimate the TVDCs in the time domain. Simulation and experimental studies demonstrate the effectiveness of the proposed method in estimating the TVDCs of journal bearings under speed-variable conditions and different levels of measurement noise.
Article
Energy & Fuels
Muhammad Imran Sadiq et al.
Summary: This study evaluated the dynamic characteristics of bio-oils in journal-bearing applications and compared them with SAE40 lubricant. The results showed that bio-oils exhibited better responsiveness and lower cross-coupled stiffness coefficients, which reduced rotor instability.
Article
Engineering, Marine
Junchao Zhu et al.
Summary: This paper investigates the impact of underwater explosion shock on the lubrication performance of ship stern bearings. A coupling model of shaft longitudinal vibration and bearing lubrication is established, and the influencing factors are analyzed.
INTERNATIONAL JOURNAL OF NAVAL ARCHITECTURE AND OCEAN ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Yang Kang et al.
Summary: This study proposes a novel method for updating the finite element model of a rotor-discs system using measured modal parameters, which includes updating system mass and stiffness matrices through particle swarm optimization algorithm and determining a damping matrix based on experimental modal frequencies and damping ratios. The updated model shows higher accuracy in predicting frequency responses and identifying dynamic coefficients.
Article
Engineering, Mechanical
Zhongliang Xie et al.
Summary: This paper investigates the influences of misalignment on the lubrication performances of water lubricated bearing, proposing a modified lubrication model. Results show that misalignment increases maximum pressure and shear stress, decreases minimum film thickness, reduces certain lubrication regions, ultimately deteriorating lubrication performances on the interface.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
J. C. Atwal et al.
Summary: This paper explores the performance parameters of a sector-shaped pad thrust bearing lubricated with water using a new pocket design, considering the effects of turbulence and cavitation. The study investigates the effects of new pocket attributes and compares the performance behaviors achieved with the new pocketed pad bearing with plain pad and rectangular pocketed bearing.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Zhongliang Xie et al.
Summary: This paper aims to reveal the micro interface lubrication regimes of water lubricated bearings through computational fluid dynamic analysis. The influences of operating conditions and dimensionless structural parameters on fluid features are explored, and experimental data verifies the correctness of the lubrication model. The research results lay a solid foundation for further optimal design of such bearings.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Nuclear Science & Technology
Zhongliang Xie et al.
Summary: This study focuses on the rotor dynamic analysis of the vertical hydro-hybrid bearing-rotor system of a two-circuit main loop liquid Sodium pump system. A new modelling method is proposed and verified with comparison of lubrication parameters. Modal analysis and harmonic response simulation are conducted, providing insights into the system's behavior under different operating conditions.
ANNALS OF NUCLEAR ENERGY
(2021)
Article
Engineering, Multidisciplinary
Ning Ding et al.
Summary: Accurate bearing degradation analysis and RUL prediction are crucial for industrial safety and economic loss prevention. This paper introduces a novel transfer learning method based on the LSTM-DNN network and domain adaptation for journal bearing RUL prediction under different work conditions. Results demonstrate the effectiveness of the proposed model in achieving higher accuracy than other transfer learning approaches.
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Engineering, Mechanical
Guo Xiang et al.
Summary: The study aims to develop a numerical model for investigating coupled water-lubricated bearings under propeller disturbance, with a validating experiment showing that disturbing moment increases the transient contact force of the bearings and coupling hydrodynamic pressure significantly affects their tribo-dynamic behaviors. Parametric studies reveal optimal radial clearance and tilting angles for minimizing contact force, while numerical results highlight the importance of propeller rotor mass on the bearings' tribo-dynamic responses.
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