Zhibo Geng

University of Electronic Science and Technology of China

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Ke Xiao

Chongqing University

Jiaxu Wang

Southwest Jiaotong University

Junyang Li

Southeast University

Min Chen

University of Electronic Science and Technology of China

Yu Xia

Chongqing University

Yun Kong

Tsinghua University

Yanfeng Han

Chongqing University

Zsófia Lendek

Technical University of Cluj-Napoca

Rui Zhao

University of Science and Technology of China

Qinkai Han

Tsinghua University

Cooperative Institutions

Chongqing University

Chongqing University of Science and Technology

Foshan University

University of Electronic Science and Technology of China

State Key Laboratory of Mechanical Transmission

Nanjing University of Aeronautics and Astronautics

Beijing Institute of Technology

Sun Yat-sen University

Huzhou University

Tsinghua University

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A profile design method to improve the wear performance of misaligned water‐lubricated bearing

Lubrication Science (2021)

Jiefu Wang Yanfeng Han Zhibo Geng Guo Xiang Jiaxu Wang

Abstract The study presents a profile design method to improve the wear performance of misaligned water‐lubricated bearing based on the modified Archard model. This method takes into account the variation of the film thickness under the mixed elastohydrodynamic lubrication (mixed‐EHL). A transient hydrodynamic Reynolds equation model with the Patir–Cheng flow factors is used to predict the evolution of the mixed‐EHL performance over time. The Archard model is extended to predict the time‐varying wear based on the fatigue concept. To verify the effectiveness of the proposed profile design method; the simulation results, including the transient contact pressure, wear depth and wear volume, between the considering and not considering the profile design are compared. To gain insight, several illustrative examples are presented to show the amelioration of the profile design. Parametric studies are reported to show the applicability of the profile design and emphasise the profile height selection. Therefore, the profile design is an extraordinary method to reduce the edge wear.

Transient (computer programming)

Fluid bearing

10.1002/ls.1539

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Citations (16)

New Multi-Channel VSMFxLMS Algorithm for Vibration Reduction of Gear Systems

Chinese Journal of Mechanical Engineering (2024)

Zhibo Geng Min Chen Yingjian Wang Yun Kong Ke Xiao

Abstract At present, the active control of gear vibration mostly relies on existing algorithms. In order to achieve effective vibration reduction of the gear system, particularly during the vibration process, this paper proposes a multi-channel VSMFxLMS algorithm based on the FxLMS algorithm. This novel approach takes into account the time-varying nature of the vibration signal during gear vibration. Adaptive filter power coefficients are updated in a skip-tongue variable-step manner using momentum factors. Firstly, the paper establishes the dynamics model of the gear system and analyzes the nonlinear dynamic characteristics of the system. It then examines the vibration damping effect of the FxLMS algorithm and analyzes its performance under different gear system motion states, considering different step lengths and momentum factors. Lastly, the proposed VSMFxLMS algorithm is compared with the FxLMS algorithm, highlighting the superiority of the former. Overall, this research highlights the potential of a multi-channel VSMFxLMS algorithm in reducing vibrations in gear systems. The study optimizes the performance of gear systems while using advanced control strategies.

10.1186/s10033-024-01112-7

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Nonlinear Dynamic Analysis of a Spur Gear Pair System with Wear Considering the Meshing Position

Lubricants (2024)

Zhibo Geng Min Chen Jiao Wang Yu Xia Yun Kong

In this paper, a nonlinear dynamic model of a parallel shaft gear system consisting of two involute spur gears is developed to investigate the coupling effect between the gradual surface wear of gear teeth over time and nonlinear dynamic characteristics. A uniform wear model that accounts for how the volumetric wear of the gear teeth affect their meshing position, backlash, and stiffness is proposed. Additionally, a nonlinear dynamic model with six degrees of freedom is described that considers friction, time-varying gear backlash, and time-varying meshing stiffness. The proposed model significantly changes the mesh stiffness, not only in terms of value but also in terms of contact ratio. Furthermore, the nonlinear dynamic characteristics of the gear system vary significantly. It is found that the gradual wear of gear teeth affects the meshing position and further has a significant impact on the nonlinear dynamic characteristics of the spur gear system. This paper provides a basis for studying the nonlinear dynamic characteristics of the spur gear system as it experiences the gradual wear of teeth over time.

Spur Gear

Position (finance)

Non-circular gear

Tooth surface

Gear train

10.3390/lubricants12010025

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Citations (5)

Triboelectric Nanogenerator-Embedded Intelligent Self-Aligning Roller Bearing with the Capability of Self-Sensing, Monitoring, and Fault Diagnosis

Sensors (2024)

Hao Shen YuRong Lv Yun Kong Qinkai Han Ke Chen

Monitoring the dynamic behaviors of self-aligning roller bearings (SABs) is vital to guarantee the stability of various mechanical systems. This study presents a novel self-powered, intelligent, and self-aligning roller bearing (I-SAB) with which to monitor rotational speeds and bias angles; it also has an application in fault diagnosis. The designed I-SAB is compactly embedded with a novel sweep-type triboelectric nanogenerator (TENG). The TENG is realized within the proposed I-SAB using a comb-finger electrode pair and a flannelette triboelectric layer. A floating, sweeping, and freestanding mode is utilized, which can prevent collisions and considerably enhance the operational life of the embedded TENG. Experiments are subsequently conducted to optimize the output performance and sensing sensitivity of the proposed I-SAB. The results of a speed-sensing experiment show that the characteristic frequencies of triboelectric current and voltage signals are both perfectly proportional to the rotational speed, indicating that the designed I-SAB has the self-sensing capability for rotational speed. Additionally, as both the bias angle and rotational speed of the SAB increase, the envelope amplitudes of the triboelectric voltage signals generated by the I-SAB rise at a rate of 0.0057 V·deg

Nanogenerator

10.3390/s24237618

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Modelling and analysis of a spur gear pair with the effect of bearing clearances

Journal of the Brazilian Society of Mechanical Sciences and Engineering (2023)

Zhibo Geng Min Chen Yanfeng Han Cheng Wang

Spur Gear

Non-circular gear

10.1007/s40430-023-04297-5

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Citations (1)

A Portable Triboelectric-Electromagnetic Hybrid Nanogenerator for Harvesting Linear Mechanical Energy

Jia Yang Xiucai Wang Naijian Hu Jianwen Chen Xinmei Yu

Nanogenerator

Mechanical energy

10.2139/ssrn.5103976

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Bifurcation and Chaos of a Spur Gear Transmission System With Non-Uniform Wear

Journal of vibration and acoustics (2020)

Zhibo Geng Ke Xiao Junyang Li Jiaxu Wang

Abstract In this study, a nonlinear dynamic model of a spur gear transmission system with non-uniform wear is proposed to analyze the interaction between surface wear and nonlinear dynamic characteristics. A quasi-static non-uniform wear model is presented, with consideration of the effects of operating time on mesh stiffness and gear backlash. Furthermore, a nonlinear dynamic model with six degrees-of-freedom is established considering surface friction, time-varying gear backlash, time-varying mesh stiffness, and eccentricity, and the Runge–Kutta method applied to solve this model. The bifurcation and chaos in the proposed dynamic model with the change of the operating time and the excitation frequency are investigated by bifurcation and spectrum waterfall diagrams to analyze the bifurcation characteristics and the dimensionless mesh force. It is found that surface wear is generated with a change in operating time and affects the nonlinear dynamic characteristics of the spur gear system. This study provides a better understanding of nonlinear dynamic characteristics of gear transmission systems operating under actual conditions.

Eccentricity (behavior)

Limit cycle

10.1115/1.4048269

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Citations (19)

Investigation on Nonlinear Dynamic Characteristics of a New Rigid-Flexible Gear Transmission With Wear

Journal of vibration and acoustics (2019)

Zhibo Geng Ke Xiao Jiaxu Wang Junyang Li

Abstract At present, the mean value of the meshing stiffness and the gear backlash is a fixed value in the nonlinear dynamic model. In this study, wear is considered in the model of the gear backlash and time-varying stiffness. With the increase of the operating time, the meshing stiffness decreases and the gear backlash increases. A six degrees-of-freedom nonlinear dynamic model of a new rigid-flexible gear pair is established with time-varying stiffness and time-varying gear backlash. The dynamic behaviors of the gear transmission system are studied through bifurcation diagrams with the operating time as control parameters. Then, the dynamic characteristics of the gear transmission system are analyzed using excitation frequency as control parameters at four operating time points. The bifurcation diagrams, Poincaré maps, fast Fourier transform (FFT) spectra, phase diagrams, and time series are used to investigate the state of motion. The results can provide a reference for the gear transmission system with wear.

10.1115/1.4043543

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Citations (23)

Nonlinear Dynamic Analysis of a Rigid–Flexible Gear Transmission Considering Geometric Eccentricities

Journal of Computational and Nonlinear Dynamics (2020)

Zhibo Geng Ke Xiao Jiaxu Wang Junyang Li

Abstract Nonlinear vibration, a main factor affecting the dynamic stability, widely exists in the transmission system. In addition, geometric eccentricities caused by the manufacturing errors are inevitable in the gear transmission system, which may lead to the excessive nonlinear vibration. In order to suppress the nonlinear vibration under the excitation of the geometric eccentricities, a rigid–flexible gear pair consisting of the ring gear, the composite material, and the hub is proposed in this study. A dynamic model with nine degrees-of-freedom which considers geometric eccentricities is proposed to analyze the nonlinear dynamic characteristics of the rigid–flexible gear pair. Furthermore, the dynamic characteristics of the rigid–flexible gear pair and the rigid gear pair are compared within a wide range of operating conditions. The comparative analysis demonstrates that the rigid–flexible gear pair has better vibration suppression effect on the system.

10.1115/1.4047336

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Citations (11)

Structural design and dynamic analysis of a metal rubber composite gear pair

Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering (2024)

Zhibo Geng Min Chen Junyang Li Yanfeng Han

This paper introduces a metal rubber composite gear for gear vibration reduction. A comprehensive structural design calculation program is developed for the metal rubber composite gear pair. The design incorporates a gap between the tooth ring and the hub to accommodate thermal expansion and contraction, ensuring smooth transmission without jamming or seizing. The design process takes into consideration the compression and damping properties of the metal rubber material. A significant variable in the design process is the relative density of the metal rubber material. It is utilized to calculate the torsional stiffness, starting friction torque, and dynamic performance of the composite gear pair. To guide and optimize the design process, a nine-degree-of-freedom dynamic model is employed for dynamic analysis. The vibration reduction effect of the metal rubber composite gear is validated through numerical simulations and experimental testing. The results confirm the efficacy of the gear in reducing vibrations. This paper provides valuable insights and guidance for future designs focused on gear vibration reduction, paving the way for further advancements in this field.

10.1177/09544089241274050

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