Article
Engineering, Multidisciplinary
Nobutoshi Ozaki, Toma Taniguchi, Toshiki Hirogaki, Eiichi Aoyama
Summary: This paper proposes a method to analyze the frequency and phase shift of chatter vibration using a two-dimensional discrete Fourier analysis of the chatter mark, and confirms the effectiveness of the proposed method.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2023)
Article
Engineering, Mechanical
Xing Lu, Jie Sun, Zhen Wei, Guangtao Li, Dianhua Zhang
Summary: This paper introduces a new model to predict the minimum friction coefficient in rolling mills, improving friction balance and designing optimal rolling conditions to expand the stability range of the friction.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Metallurgy & Metallurgical Engineering
Zhi-ying Gao, Bo Tian, Yang Liu, Li-yuan Zhang, Mao-lin Liao
Summary: The study focused on chatter instability in a 5-stand cold tandem rolling mill and successfully suppressed the chatter while improving rolling efficiency through an optimization model, providing valuable insights for intelligent manufacturing of the rolling process.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Cheng Qian, Liuliu Zhang, Changchun Hua
Summary: This paper studies the vibration suppression control strategy for rolling mill systems under time varying delay, considering the nonlinear rolling force and disturbance during the dynamic rolling process. A hydraulic coupling vibration model is established based on the flow equation and Newton's second law. Meanwhile, a time-delayed coupling vibration state space model is introduced via choosing the appropriate state variables to account for the input delay caused by strip thickness measurement. The effectiveness of the proposed control algorithm is verified through numerical simulation results.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Manufacturing
Zhaolun Liu, Peng Li, Jiahao Jiang, Bin Liu
Summary: This study investigates the impact of the nonlinear stiffness of the hydraulic cylinder on the vibration behavior of the rolling mill system. It is found that a higher nonlinear stiffness leads to greater instability in the mill system, while weaker nonlinear stiffness results in the vibration gradually converging to stability.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Construction & Building Technology
Ziwei Mo, Chun-Ho Liu, Yat-Kiu Ho
Summary: This study characterizes the flows of the Atmospheric Surface Layer (ASL) over real urban morphology using wind tunnel experiments, highlighting the noticeable variations of mean wind speed and turbulence statistics in the inertial sublayer (ISL) and roughness sublayer (RSL). It also introduces a new analytical solution to improve the prediction of ASL mean wind speeds and observes that turbulence statistics in the RSL velocities are positively skewed with high kurtosis.
BUILDING AND ENVIRONMENT
(2021)
Article
Engineering, Industrial
Alper Dumanli, Burak Sencer
Summary: The paper introduces a new active vibration control strategy for shaping the Stability Lobe diagram to achieve higher material removal rates. The controller is designed as a feedback filter with optimized parameters to suppress regeneration dynamics. The proposed strategy has been successfully applied to systems with significant vibration suppression effects in turning dynamics.
CIRP ANNALS-MANUFACTURING TECHNOLOGY
(2021)
Article
Construction & Building Technology
Yijiang Xue, Wei Hao
Summary: Affected by nonlinear aerodynamic damping near the vortex lock-in wind speed, the accurate evaluation of nonlinear aerodynamic damping plays a vital role in response prediction and vibration control of tall buildings. In this study, an analytical approach is proposed to extract the aerodynamic damping by utilizing the probability distribution characteristic of vibration amplitude of stochastic crosswind response with different structural damping ratio. By linear least-squares fitting of the PDF of crosswind displacement, the identification of amplitude-dependent aerodynamic damping can be performed at the given wind speed.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Automation & Control Systems
Yang Zhang, Weizhong Wang, Huan Zhang, Haichao Li, Cuirong Liu, Xiaozhong Du
Summary: This study proposes a vibration monitoring method for strip rolling mills based on the digital twin model, which effectively reduces the complexity and cost of traditional monitoring systems. By establishing a coupling vibration mechanism model and a digital twin model, the vibration of the rolling mill can be accurately monitored and analyzed, and corresponding measures to suppress the vibration can be proposed.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Marine
Jia Chen, Jianming Yang, Kunfan Shen, Zhongqiang Zheng, Zongyu Chang
Summary: This study investigates the nonlinear rolling of a ship under the combined excitation of harmonic excitation and Gaussian white noise excitation. The Fokker-Planck equation for nonlinear stochastic ship rolling is derived and numerically solved using the finite element method and Crank-Nicolson method. The findings are consistent with Monte Carlo simulation, demonstrating the applicability and effectiveness of the numerical methods used. The effects of harmonic excitation amplitude and stochastic excitation intensity on nonlinear ship rolling are also analyzed, providing important references for ship stability and capsizing research.
Article
Chemistry, Analytical
Rongrong Peng, Xingzhong Zhang, Peiming Shi
Summary: This paper proposes a method for diagnosing faults in rolling mill bearings using the improved sparrow search algorithm deep belief network (ISAA-DBN). The method converts non-stationary vibration signals into two-dimensional spectral kurtosis time-frequency images using the fast spectral kurtosis approach and decreases the data dimension using principal component analysis (PCA). The intelligent optimized self-adaptive function of the deep belief network is achieved using the sparrow search algorithm.
Article
Mechanics
Jin Wang, Eugenio Brusa, Yan Peng, Xiangyang Zhao, Menghan Wang, Cristiana Delprete, Chiara Gastaldi
Summary: This paper investigates the dynamic behavior of a rolling mill during variable gauge rolling and establishes the dynamic rolling force model and the hydraulic cylinder dynamic model. The Incremental Harmonic Balance Method and the Runge-Kutta method are used to analyze the amplitude-frequency characteristics and vibration characteristics of the rolling mill system.
Article
Engineering, Industrial
Bora Eren, Soohyun Nam, Burak Sencer
Summary: This paper presents a generalized prediction method for cutting force and regenerative chatter stability in the modulated turning process. It models the uncut chip thickness by considering tool kinematics and surface topography, and predicts the cutting forces using orthogonal cutting mechanics. A semi-discretization-based solution is developed to accurately predict the stability lobe diagrams for the modulated turning process.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Chaofan Sun, Wu Zhao, Dan Huang, Hongbin Zhang
Summary: This paper investigates the stability of horizontal nonlinear vibration of four-high cold mill under the effects of gyro-precession and eccentricity between rolls. The results show the effect of different parameter variation on the nonlinear dynamic behavior of horizontal vibration in rolling system. The study provides a theoretical reference for service stability and dynamic reliability of the rolling mill system.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Manufacturing
Hongbin Zhang, Wu Zhao, Dan Huang, Chaofan Sun, Junkai Fan
Summary: This article reveals the vibration stability of the cold rolling system under different parameter conditions by establishing a vertical nonlinear vibration model. The results show that parameter changes can cause bifurcation and chaos, and a nonlinear phenomenon of the system is also found. Furthermore, the parameter matching regions for periodic and chaotic motions of the cold rolling system are determined.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Engineering, Electrical & Electronic
Yifan Li, Yaocheng Yang, Sajad Saraygord Afshari, Xihui Liang, Zaigang Chen
Summary: In this study, an adaptive CFRE method is proposed to evaluate the health condition of rolling bearings under time-varying operating speed. This method directly extracts fault-related characteristic curves in a time-frequency representation, addressing the issues of search bandwidth selection and rationality of cost function in CFRE. Numerical simulations and experimental investigations demonstrate that the proposed method is more robust to interferences and noise, and has a smaller root mean square error in estimating bearing characteristics under variable speed conditions.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Engineering, Mechanical
Zheng-Fa Li, Ling-Yun Zhu, Shi-Qian Chen, Zai-Gang Chen, Xiang-Feng Gou
Summary: This article discusses the influence of backlash and contact ratio on the safety characteristics of gear transmission systems, and proposes a nonlinear dynamics model and the concept of safety domains to study these influences. The results show that time-varying backlash plays an important role in identifying multi-state meshing and establishing safety domains.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Civil
Yuqing Liu, Zaigang Chen, Xia Hua, Wanming Zhai
Summary: This study analyzes the impact of rotor eccentricity on the dynamic performance of traction motors and motor bearings, and extracts the fault vibration features. The results show that rotor eccentricity worsens the vibration conditions of the traction motor and intensifies the interactions between motor bearing components.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART F-JOURNAL OF RAIL AND RAPID TRANSIT
(2022)
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, Yifan Li, Wanming Zhai
Summary: This study establishes a skidding dynamics model of lubricated rolling bearings, considering the interactions between the roller and races, as well as the cage. The effects of lubricant stiffness, film thickness, friction coefficient, passing flow resistances, and resistance torques on the dynamic characteristics of the bearing are analyzed. The study also explores methods to mitigate skidding, such as adjusting roller number, lubricant properties, and interference fit. The results show that skidding is induced by low tangential friction forces and high passing flow resistances, and can be alleviated by strengthening interactions at the roller-race interface or reducing running resistance.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Zaigang Chen, Yunsheng Zhi, Kaiyun Wang, Wanming Zhai
Summary: This study establishes a rigid-flexible locomotive coupled dynamics model of an HX locomotive and investigates the effects of the drive and transmission system on the wheel-rail dynamic response and wheel polygonal wear. The evolution of wear depth under different running speeds and wheel profile initial states is also studied.
VEHICLE SYSTEM DYNAMICS
(2023)
Article
Engineering, Mechanical
Yifan Li, Xin Zhang, Zaigang Chen, Yaocheng Yang, Changqing Geng, Ming J. Zuo
Summary: This paper proposes a novel time-frequency ridge estimation (TFRE) method, which integrates a new cost kernel function and an adaptive search region detection principle to improve the performance of ridge estimation. Experimental results demonstrate that the proposed TFRE outperforms state-of-the-art methods in ridge estimation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Multidisciplinary
JieYu Ning, ZaiGang Chen, WanMing Zhai
Summary: An improved mesh stiffness calculation method for helical gear with spatial crack is proposed in this study to consider the coupling effects between neighboring loaded teeth, improving the accuracy and applicability of the calculation. The load distribution law for the engaged cracked tooth along the tooth width and profile can be obtained. The results show that the mesh stiffness of the multi-tooth engagement calculation using this model can be further improved compared with traditional methods.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Kun Yue, Zhong Kang, Mengjie Zhang, Liming Wang, Yimin Shao, Zaigang Chen
Summary: An improved gear meshing power loss calculation method is proposed in this paper to consider the coupling effects between gear friction and dynamic characteristics. A six degrees-of-freedom gear dynamic model and power loss iteration calculation process are established, and the effects of gear surface quality and loads on power loss are analyzed. Experimental results show that this method is in better agreement with the experimental results compared to the traditional method.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Yuqing Liu, Zaigang Chen, Kaiyun Wang, Wanming Zhai
Summary: The gear transmission in high-speed trains is important for transmitting traction torque. Wheel-rail interactions can affect the gear transmission and support bearings on curves with larger centrifugal forces. To address this, a spatial vehicle-track coupled dynamics model is proposed, considering various factors such as time-varying mesh stiffness, dynamic transmission error, support stiffness, and internal interactions of the gearcase bearing. Results show that the lateral force and derailment coefficient are affected by the lateral component of the mesh force, and the centrifugal effect influences the contributions of the gear pair's lateral and vertical motions.
VEHICLE SYSTEM DYNAMICS
(2023)
Article
Automation & Control Systems
Yifan Li, Yaocheng Yang, Ke Feng, Ming J. J. Zuo, Zaigang Chen
Summary: This article proposes a new automated and adaptive ridge extraction method for accurately extracting the instantaneous frequency information of signal components from time-frequency graphs. It has the advantage of assessing machine health conditions without rotational speed measurement.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Engineering, Mechanical
Zirui Ye, Zaigang Chen, Ziwei Zhou, Wanming Zhai
Summary: This paper develops a dynamics model of a locomotive with direct drive traction system, taking into account the electromechanical coupling effect and nonlinearities in the wheel-rail contact and flexible transmission coupling. The results show that the harmonic components in the electrical subsystem have significant effects on the key components of the locomotive and can cause resonance in the mechanical transmission system at specific speeds. The resonance can be eliminated by adopting a harmonic suppression algorithm.
VEHICLE SYSTEM DYNAMICS
(2023)
Article
Engineering, Electrical & Electronic
Yifan Li, Ke Feng, Yuejian Chen, Zaigang Chen
Summary: In this article, a multioperator morphological undecimated wavelet (MOMUW) approach is proposed to effectively denoise and extract impulse features from vibration mixtures. Experimental results demonstrate that the proposed method can accurately detect wheelset bearing compound faults and outperforms the existing approaches. Moreover, the success and failure of MUWs with different operators and levels in bearing fault diagnosis are analyzed and compared, providing a theoretical foundation for constructing new MUWs.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Mechanical
Zaigang Chen, Jieyu Ning, Guojun Yang, Zhihui Chen, Jizhong Yang, Wanming Zhai
Summary: This study developed a dynamic model for the rack railway vehicle and track system to evaluate their dynamic behaviors on large-slope lines. The research found that the vibration responses of the wheelset and the rack are mainly influenced by the gear-rack mesh excitations, and the presence of gear-rack engagement reduces wheel loads.
VEHICLE SYSTEM DYNAMICS
(2023)
Article
Engineering, Mechanical
Yaoxiang Yu, Liang Guo, Zaigang Chen, Hongli Gao, Zhifeng Shi, Guoli Zhang
Summary: Two cage crack models are proposed in this study and coupled with the axle-box bearing model to investigate the dynamic characteristics and changes in contact forces caused by cracks.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
