Article
Mechanics
Pengfei Wang, Hongyang Xu, Hui Ma, Yang Yang, Qingkai Han, Bangchun Wen, Xiaopeng Li
Summary: A rotor dynamic model with bearing dynamic misalignment is established to study the nonlinear vibration problem caused by the dynamic misalignment of rolling bearings in rotating machinery. The effects of single and two bearings' dynamic misalignment and the phase relationship of two dynamic misalignment bearings on the rotor vibration characteristics are investigated. Furthermore, the influence of bearing clearance, raceway curvature radius, ball number, and radial load on the nonlinear vibration response of the dynamic misalignment bearing-unbalance rotor system is analyzed. The results indicate that dynamic misalignment can excite vibration at twice the rotor frequency, increase resonance speed, and enhance the rotor's hardening-type nonlinearity characteristics. The influence of out-of-phase dynamic misalignment on rotor resonance is greater than that of in-phase misalignment. The system stability can be improved by reducing bearing clearance and increasing the curvature radius coefficient. The vibration caused by bearing dynamic misalignment can be reduced by selecting bearings with more balls and appropriately increasing the bearing load.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Mechanical
Christoph Baum, Hartmut Hetzler, Simon Schroeders, Tim Leister, Wolfgang Seemann
Summary: A novel physical and mathematical model of foil air bearings was developed with a focus on computational time-efficiency for rotor dynamic investigations. The model, which accounts for nonlinear deformation behavior and linear viscous damping, was validated using published experimental data and reduction technique, showing a decrease in computation time up to a factor of 1000 with a slight loss in accuracy. The bearing model was also coupled with a rigid rotor model to demonstrate its applicability during a run-up and coast-down.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
P. Ganai, J. C. Atwal, R. K. Pandey, J. K. Dutt
Summary: This paper investigates the performance of oil-lubricated bump journal bearings with micro-pockets on top foil surfaces for lightly loaded applications. The influence of the number and attributes of the pockets on the bearing's performance behaviors is discussed. The study finds that the top foil with six pockets performs the best, followed by four, eight, and ten pockets. The micro-pocketed foil reduces the coefficient of friction by 7-18% compared to plain foil and improves the rotor stability.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Hongchuan Cheng, Yimin Zhang, Wenjia Lu, Zhou Yang
Summary: A mathematical model is presented to study the dynamic properties of rotor-bearing coupling system under various effects, and the impact of typical parameters on the mechanical characteristics of the rotor system is analyzed. The results offer theoretical support for controlling the rotor-bearing system and studying the nonlinear vibration mechanism in practical applications.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Engineering, Mechanical
Yuanyuan Liu, Xiaodong Sun, Kian K. Sepahvand, Steffen Marburg
Summary: This paper introduces an analytical model of a three-pad squeeze film bearing and analyzes its static and dynamic performance through numerical methods, showing good agreement with experimental results. The study suggests that eccentricity can be controlled by adjusting vibration amplitude or nominal clearance of the bearing, while decreasing rotation speed or increasing vibration amplitude will increase direct stiffness and damping coefficients.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Energy & Fuels
Muhammad Imran Sadiq, Wan Aizon W. Ghopa, Mohd Zaki Nuawi, Mohammad Rasidi Rasani, Nor Kamaliana Khamis, Mohd Radzi Abu Mansor
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, Mechanical
Wenzhuo Zhang, Ming Li
Summary: This study establishes a dynamic model of the rotor-bearing system subjected to the coupled heave and pitch motions of a ship sailing in head waves, and analyzes the effects on the system's dynamic characteristics. The results show complex quasi-periodic motion and dynamic bifurcation characteristics of the system, indicating a potential failure of the system at high speeds.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2022)
Article
Thermodynamics
Mo Yang, Hao Xuan, Tao Qin, Yikun Wang, Yuebin Zhou, Wen Zhang
Summary: This paper presents a nonlinear dynamic analysis of a composite rotor-bearing system with pedestal looseness, considering the nonlinear oil film force and the pedestal looseness. The results indicate that the stiffness and damping coefficients of a composite shaft tube can be strongly influenced by the laminate parameters, affecting the instability speed of the rotor system. To enhance the oil film instability speed, maximizing the ratio of the small orientation angle layer or the ±45° layer is essential. The research results have important theoretical value for the design of composite rotor-bearing systems.
ADVANCES IN MECHANICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Runeng Zhou, Yongpeng Gu, Jiang Cui, Gexue Ren, Suyuan Yu
Summary: This paper investigates the Hopf bifurcation behavior in gas foil bearing-rotor systems and provides insights into the nonlinear dynamic characteristics of systems with supercritical or subcritical Hopf bifurcations. The research demonstrates that systems with a supercritical Hopf bifurcation exhibit better dynamic characteristics, and parameter analysis shows that foil stiffness and aspect ratio have significant effects on the type of bifurcation.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Chuanbing Zhang, Hongrui Ao, Hongyuan Jiang
Summary: Hybrid gas dynamic bearings (HGDBs) are designed to enhance the viscous damping and stiffness of conventional gas foil bearings (GFBs). The coupling of rarefied gas effect, roughness effect, and gas leakage effect decreases the static load-carrying capacity, while dynamic coefficients are influenced by the dynamic sliding bearing model.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Kang Zhang, Kai Feng, Wenjun Li, Lijun Song
Summary: The study presents a numerical model that efficiently reflects the actual mechanical properties of O-rings and the coupling between aerodynamic and aerostatic effects on the performance of a rotor-PAJB system. The model is well verified by experimental results, showing the significant impact of O-ring material and quantity on the stability of the system.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Mechanical
Jianbo Zhang, Zhifang Deng, Kun Zhang, Hailiang Jin, Tao Yuan, Ce Chen, Zhimin Su, Yitao Cao, Zhongliang Xie, Danyang Wu, Jingping Sui
Summary: In this paper, the steady state and dynamic performances of aerostatic bearings are studied using the finite difference method. The linear stability of the aerostatic bearing is also investigated. The results show that geometry parameters, rotational speed, and supply pressure have significant effects on the performances of aerostatic bearings.
Article
Mathematics, Applied
Zhongliang Xie, Kang Yang, Jian Jiao, Weiyang Qin, Tao Yang, Chao Fu, Anbo Ming
Summary: This paper clarifies the mechanism of the dynamic characteristics of the water-lubricated bearing-rotor coupling system at different operating stages. Dynamic models of the system are developed to investigate the influences of different operating modules on the dynamic characteristics. The effects of different speeds, different loads, and different impacts are analyzed. Experimental results verify the validity of the newly developed models, providing theoretical foundations for the optimum design of such bearing-rotor systems.
Article
Engineering, Mechanical
Huihui Miao, Changyou Li, Chenyu Wang, Mengtao Xu, Yimin Zhang
Summary: This study investigates the dynamic characteristics of the CNC vertical milling machine spindle system using a novel dynamic model. Factors influencing spindle vibration behavior and stability, such as spindle speed, bearing parameters, and external factors, are identified and analyzed. Experimental validation of the model's effectiveness suggests it can benefit spindle structural design and machining accuracy optimization.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Zhongliang Xie, Jian Jiao, Kang Yang, Tao He, Rugang Chen, Weidong Zhu
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)
Article
Engineering, Mechanical
Weimin Wang, Qihang Li, Jinji Gao, Jianfei Yao, Paul Allaire
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2016)
Article
Engineering, Mechanical
Qihang Li, Weimin Wang, Brian Weaver, Houston Wood
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2017)
Article
Engineering, Multidisciplinary
Guangfu Bin, Xuejun Li, Yiping Shen, Weimin Wang
Article
Engineering, Mechanical
Qihang Li, Weimin Wang, Brian Weaver, Xing Shao
MECHANISM AND MACHINE THEORY
(2018)
Article
Engineering, Mechanical
Weimin Wang, Binbin Liu, Ya Zhang, Xing Shao, Paul E. Allaire
TRIBOLOGY INTERNATIONAL
(2018)
Article
Chemistry, Analytical
Zhongsheng Chen, Jianhua Liu, Chi Zhan, Jing He, Weimin Wang
Article
Engineering, Mechanical
Qihang Li, Weimin Wang, Fulei Chu
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2019)
Article
Engineering, Multidisciplinary
Wang WeiMin, Shao Xing, Li QiHang, Gao JinJi, Hao ZeRui
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2019)
Article
Engineering, Mechanical
Kang Chen, Weimin Wang, Xulong Zhang, Ya Zhang
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Engineering, Aerospace
Weimin Wang, Xulong Zhang, Dongfang Hu, Dengpeng Zhang, Paul Allaire
CHINESE JOURNAL OF AERONAUTICS
(2020)
Article
Engineering, Mechanical
Weimin Wang, Dongfang Hu, Qihang Li, Xulong Zhang
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2020)
Article
Acoustics
Qihang Li, Brian Weaver, Fulei Chu, Weimin Wang
JOURNAL OF SOUND AND VIBRATION
(2020)
Review
Engineering, Mechanical
Zhongsheng Chen, Hao Sheng, Yemei Xia, Weimin Wang, Jing He
Summary: The paper highlights the importance and challenges of blade tiptiming (BTT) technique as a method for blade vibration monitoring. It outlines the three main challenges faced by BTT technology, comprehensively reviews the developments of BTT probes, signal preprocessing, and vibration monitoring, and discusses future trends.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Construction & Building Technology
Xing Shao, Weimin Wang, Weibo Li, Qihang Li
Summary: This paper presents an active fast vibration control strategy for rotating machinery, which has been experimentally validated and implemented in a model to significantly reduce vibration amplitudes in a short period of time.
STRUCTURAL CONTROL & HEALTH MONITORING
(2021)
Article
Engineering, Multidisciplinary
Binbin Liu, Weimin Wang, Ya Zhang, Xing Shao, Weibo Li
JOURNAL OF FAILURE ANALYSIS AND PREVENTION
(2018)
Article
Engineering, Multidisciplinary
A. A. Aganin, A. I. Davletshin
Summary: A mathematical model of interaction of weakly non-spherical gas bubbles in liquid is proposed in this paper. The model equations are more accurate and compact compared to existing analogs. Five problems are considered for validation, and the results show good agreement with experimental data and numerical solutions. The model is also used to analyze the behavior of bubbles in different clusters, providing meaningful insights.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Hao Wu, Jie Sun, Wen Peng, Lei Jin, Dianhua Zhang
Summary: This study establishes an analytical model for the coupling of temperature, deformation, and residual stress to explore the mechanism of residual stress formation in hot-rolled strip and how to control it. The accuracy of the model is verified by comparing it with a finite element model, and a method to calculate the critical exit crown ratio to maintain strip flatness is proposed.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Shengwen Tu, Naoki Morita, Tsutomu Fukui, Kazuki Shibanuma
Summary: This study aimed to extend the finite element method to cope with elastic-plastic problems by introducing the s-version FEM. The s-version FEM, which overlays a set of local mesh with fine element size on the conventional FE mesh, simplifies domain discretisation and provides accurate numerical predictions. Previous applications of the s-version FEM were limited to elastic problems, lacking instructions for stress update in plasticity. This study presents detailed instructions and formulations for addressing plasticity problems with the s-version FEM and analyzes a stress concentration problem with linear/nonlinear material properties.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Bo Fan, Zhongmin Wang
Summary: A 3D rotating hyperelastic composite REF model was proposed to analyze the influence of tread structure and rotating angular speed on the vibration characteristics of radial tire. Nonlinear dynamic differential equations and modal equations were established to study the effects of internal pressure, tread pressure sharing ratio, belt structure, and rotating angular speed on the vibration characteristics.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
X. W. Chen, Z. Q. Yue, Wendal Victor Yue
Summary: This paper examines the axisymmetric problem of a flat mixed-mode annular crack near and parallel to an arbitrarily graded interface in functionally graded materials (FGMs). The crack is modeled as plane circular dislocation loop and an efficient solution for dislocation in FGMs is used to calculate the stress field at the crack plane. The analytical solutions of the stress intensity factors are obtained and numerical study is conducted to investigate the fracture mechanics of annular crack in FGMs.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Xumin Guo, Jianfei Gu, Hui Li, Kaihua Sun, Xin Wang, Bingjie Zhang, Rangwei Zhang, Dongwu Gao, Junzhe Lin, Bo Wang, Zhong Luo, Wei Sun, Hui Ma
Summary: In this study, a novel approach combining the transfer matrix method and lumped parameter method is proposed to analyze the vibration response of aero-engine pipelines under base harmonic and random excitations. The characteristics of the pipelines are investigated through simulation and experiments, validating the effectiveness of the proposed method.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Xiangyu Sha, Aizhong Lu, Ning Zhang
Summary: This paper investigates the stress and displacement of a layered soil with a fractional-order viscoelastic model under time-varying loads. The correctness of the solutions is validated using numerical methods and comparison with existing literature. The research findings are of significant importance for exploring soil behavior and its engineering applications under time-varying loads.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Thuy Dong Dang, Thi Kieu My Do, Minh Duc Vu, Ngoc Ly Le, Tho Hung Vu, Hoai Nam Vu
Summary: This paper investigates the nonlinear torsional buckling of corrugated core sandwich toroidal shell segments with functionally graded graphene-reinforced composite (FG-GRC) laminated coatings in temperature change using the Ritz energy method. The results show the significant beneficial effects of FG-GRC laminated coatings and corrugated core on the nonlinear buckling responses of structures.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Zhihao Zhai, Chengbiao Cai, Qinglai Zhang, Shengyang Zhu
Summary: This paper investigates the effect of localized cracks induced by environmental factors on the dynamic performance and service life of ballastless track in high-speed railways. A mathematical approach for forced vibrations of Mindlin plates with a side crack is derived and implemented into a train-track coupled dynamic system. The accuracy of this approach is verified by comparing with simulation and experimental results, and the dynamic behavior of the side crack under different conditions is analyzed.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
James Vidler, Andrei Kotousov, Ching-Tai Ng
Summary: The far-field methodology, developed by J.C. Maxwell, is utilized to estimate the effective third order elastic constants of composite media containing random distribution of spherical particles. The results agree with previous studies and can be applied to homogenization problems in other fields.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Kim Q. Tran, Tien-Dat Hoang, Jaehong Lee, H. Nguyen-Xuan
Summary: This study presents novel frameworks for graphene platelets reinforced functionally graded triply periodic minimal surface (GPLR-FG-TPMS) plates and investigates their performance through static and free vibration analyses. The results show that the mass density framework has potential for comparing different porous cores and provides a low weight and high stiffness-to-weight ratio. Primitive plates exhibit superior performance among thick plates.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Bence Hauck, Andras Szekrenyes
Summary: This study explores several methods for computing the J-integral in laminated composite plate structures with delamination. It introduces two special types of plate finite elements and a numerical algorithm. The study presents compact formulations for calculating the J-integral and applies matrix multiplication to take advantage of plate transition elements. The models and algorithms are applied to case studies and compared with analytical and previously used finite element solutions.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Wu Ce Xing, Jiaxing Wang, Yan Qing Wang
Summary: This paper proposes an effective mathematical model for bolted flange joints to study their vibration characteristics. By modeling the flange and bolted joints, governing equations are derived. Experimental studies confirm that the model can accurately predict the vibration characteristics of multiple-plate structures.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Pingchao Yu, Li Hou, Ke Jiang, Zihan Jiang, Xuanjun Tao
Summary: This paper investigates the imbalance problem in rotating machinery and finds that mass imbalance can induce lateral-torsional coupling vibration. By developing a model and conducting detailed analysis, it is discovered that mass imbalance leads to nonlinear time-varying characteristics and there is no steady-state torsional vibration in small unbalanced rotors. Under largely unbalanced conditions, both resonant and unstable behavior can be observed, and increasing lateral damping can suppress instability and reduce lateral amplitude in the resonance region.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Yong Cao, Ziwen Guo, Yilin Qu
Summary: This paper investigates the mechanically induced electric potential and charge redistribution in a piezoelectric semiconductor cylindrical shell. The results show that doping levels can affect the electric potentials and mechanical displacements, and alter the peak position of the zeroth-order electric potential. The doping level also has an inhibiting effect on the first natural frequency. These findings are crucial for optimizing the design and performance of cylindrical shell-shaped sensors and energy harvesters.
APPLIED MATHEMATICAL MODELLING
(2024)
