Article
Engineering, Mechanical
Dong Guo, Qinfeng Ning, Shuaishuai Ge, Yawen Wang, Yi Zhou, Xiaohui Shi
Summary: A nonlinear dynamic model is developed in this paper to study the vibration response and nonlinear behavior of gear rattle. The model considers multiple nonlinear factors and is verified through comparison with bench test results. Parametric study using various analysis methods reveals important characteristics of the system, providing guidance for the understanding and control of gear rattle.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Mechanical
Wei Liu, Kai Shi, Valerii Tupolev, Guangbin Yu, Bing Dai
Summary: This paper investigates the nonlinear dynamics of a two-stage planetary gear system with elastic ring gear and sliding friction. Compared to previous studies, this research considers the effect of sliding friction and ring's elasticity on the system behavior. Numerical examples are used to compare the behaviors of the TSPG model with sliding friction and elastic component with the lumped parameter model.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Yangshou Xiong, Quanwei Wang, Kang Huang, Zongshan Zhou
Summary: In a transmission system, the combination of metal small gears and plastic large gears can reduce weight and noise, as well as ensure strength and longevity. However, research on metal-plastic friction is still insufficient. This study focused on the ADC12-POM gear pair and conducted friction tests to determine the friction coefficients under different conditions. A calculation model for the friction coefficients was established.
TRIBOLOGY TRANSACTIONS
(2023)
Article
Engineering, Mechanical
Zhengfa Li, Zaigang Chen, Wanming Zhai
Summary: This paper establishes a dynamic model of spur gear pair considering the extended tooth contact, coupling effect between gear neighboring teeth, and some time-varying parameters. The study reveals the impact of the extended tooth contact and coupling effect on the bifurcation characteristics of the gear system. The results show that the coupling effect between neighboring teeth intensifies the system bifurcation and chaotic motion, while extended tooth contact enhances this effect. However, more extended tooth contact decreases the parameter range of system bifurcation.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
Yuqing Liu, Zaigang Chen, Jieyu Ning, Kaiyun Wang, Wanming Zhai
Summary: This study investigates the characteristics of the locomotive traction motor operating in a vibration environment by coupling the dynamic equations of the rotor and bearings, and considering elastic deformations and nonlinear contact forces. The results indicate that the elastic deformations of the shaft and bearings can change the dynamic response of the traction motor and its support bearings.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2022)
Article
Engineering, Mechanical
Esteban Bernal, Maksym Spiryagin, Qing Wu, Chris Bosomworth, Ben Sneath, Colin Cole
Summary: This paper proposes a methodology to improve the accuracy of wear analyses of locomotive-track interaction by using dynamic simulations. The proposed method considers in-train forces and utilizes a co-simulation approach to implement simulation results on a detailed locomotive vehicle dynamic model. The wheel-rail contact stress and slip results are then processed into a Dynamic Load Spectrum. Experimental measurements using this method provided more realistic wear rates, allowing for accurate estimation of rail material volume loss.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Mohammad Lutfar Rahaman, Esteban Bernal, Maksym Spiryagin, Chris Bosomworth, Ben Sneath, Qing Wu, Colin Cole, Tim McSweeney
Summary: This study investigates the effect of slip rate on the traction coefficient of the wheel/rail interface under replicated tribological and locomotive operating conditions using a twindisc machine. The results show that the traction coefficient decreases as the slip rate increases. The interface materials have less time to accumulate strain hardening under a faster slip rate, resulting in a smaller increase in surface hardness. The shorter running-in period under a higher slip rate indicates that the surface micro-geometry of the interface materials reaches a steady state faster. The findings of this research can be valuable for improving locomotive traction control systems and enhancing the safety and maintenance efficiency of railway operations.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Francesc Perez-Rafols, Lucia Nicola
Summary: A model is proposed to study the incipient sliding of contacts in the presence of friction and adhesion, showcasing different contact pressure profiles under varying parameters. Experimental investigation is conducted on the contact between a smooth cylinder and a flat body under strong adhesion-friction interactions.
Article
Mathematics, Interdisciplinary Applications
Kang Huang, Zhenbang Cheng, Yangshou Xiong, Guangzhi Han, Luyang Li
Summary: This study investigates the dynamic characteristics of a spur gear pair system with two kinds of gear backlash, focusing on modeling and deriving the sliding friction force. A torsional dynamic model is established, and simulation experiments are conducted using rotational velocity and initial gear backlash as variables. Comparison of system behavior reveals that the system with fractal backlash exhibits chaos at higher rotational speed and initial gear backlash, while the system with fixed backlash displays richer nonlinear dynamic behaviors. The results provide insights for future spur gear design and manufacturing.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Engineering, Mechanical
Ling-Yun Zhu, Zheng-Fa Li, Xiang-Feng Gou, Jian-Fei Shi
Summary: The study focuses on the safety characteristics and evolutionary mechanisms of spur gear pairs, establishing a comprehensive teeth contact safety domain and providing a method to judge system safety characteristics. Through calculations and analysis like multi-initial values bifurcation diagrams, the distribution of coexistence attractors and transition of system motions under the established safety domain are revealed.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Multidisciplinary Sciences
Hao Liu, Dayi Zhang, Kaicheng Liu, Jianjun Wang, Yu Liu, Yifu Long
Summary: This paper proposes a nonlinear dynamic model for gear systems, considering the time-varying characteristics of meshing parameters caused by transverse vibration and the influence of sliding friction. The dynamic responses of the new and previous models are compared by using input speed and friction coefficient as control parameters. The results show that transverse vibration affects the meshing parameters and sliding friction, leading to distinctive nonlinear dynamic responses. This study provides a basis for further research and enhances the understanding of system vibration control.
Article
Engineering, Mechanical
Yishen Zhang, Changguang Zhou, Hutian Feng
Summary: This study proposes a meticulous friction torque model that takes into account both asperity interaction and fluid traction mechanisms in micro-scale physical analysis. The model is validated through experimental data and is more suitable for light to moderate working conditions, contributing to a better understanding and prediction of friction torque.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Cheng Wang, Mao Ken
Summary: This paper accurately calculates contact path, length of contact line, load distribution, and transmission errors of helical gear pairs using loaded tooth contact analysis. By combining with elastohydrodynamic lubrication theory, a calculation method for the sliding friction coefficient on tooth surfaces is proposed.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Siyu Wang, Rupeng Zhu
Summary: A non-linear dynamic model of a fixed-axis spur planetary gear-rotor-bearing system for the gearbox in Geared Turbofan (GTF) engine is established and analyzed, revealing abundant non-linear behaviors and dynamic characteristics. The dynamic response under varying frictional coefficients is demonstrated, and vibration characteristics are investigated and controlled through changing support stiffness of star bearing. These results provide insights into undesirable dynamic motion and serve as a reference for the design and control of gear systems.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Rituraj Rituraj, Andrea Vacca, Manuel Rigosi
Summary: This paper presents a novel methodology for modeling the hydro-mechanical losses in external gear machines (EGMs). The study shows that meshing friction is the dominant source of torque losses, and the predicted efficiencies from the model match those observed in experiments.
MECHANISM AND MACHINE THEORY
(2021)
