Article
Engineering, Mechanical
Mo Shuai, Zhang Yingxin, Song Yuling, Song Wenhao, Huang Yunsheng
Summary: The nonlinear dynamic model of the non-orthogonal face gear-rotor-bearing system was established in this study, considering the influence of nonlinear features such as time-varying meshing stiffness, transmission error, tooth backlash, bearing clearance, and collision force and friction between tooth. The effects of excitation frequency, friction coefficient, and support stiffness on the dynamic characteristic of the system were analyzed using various methods. The results revealed that the non-orthogonal gear-rotor-bearing transmission system exhibits a variety of nonlinear characteristics, and the parameters of the system should be controlled to ensure stability and prevent amplitude mutation.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Multidisciplinary
Yong Wang, Yinghua Liao, Huachao Xu
Summary: This study investigates the effects of multi-excitation on the vibration responses of each planetary gear component using a translational-rotational dynamic model. Fourier series are used to simulate the excitation sources, and frequency-response functions are applied to determine their effects on the vibration responses in the whole frequency range. The study effectively solves the problem of superposition of multi-component vibration responses under multi-excitation sources, and reveals the mapping between excitation sources and the vibration response of each planetary gear component.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Mathematics, Interdisciplinary Applications
Suixian Liu, Aijun Hu, Yue Zhang, Ling Xiang
Summary: A nonlinear dynamic model for a multistage planetary gear transmission system is proposed, considering the time-varying meshing stiffness, comprehensive meshing errors and backlash. The system's stability and dynamic behavior under different parameter variations are studied using numerical methods and various analysis techniques.
INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS
(2022)
Article
Chemistry, Multidisciplinary
Julia Scholtyssek, Luka Josephine Bislich, Felix Cordes, Karl-Ludwig Krieger
Summary: This study proposes an approach for monitoring bearings in a two-stage planetary gearbox based on vibration analysis. A convolutional neural network is trained and evaluated using the data of six damage phenomena and one healthy bearing. The results show a high accuracy in detecting different damage severities, with an averaged balanced accuracy of 0.96. However, the classification of unknown damage phenomena is limited to a binary classifier. The study demonstrates the possibility of reliable bearing damage detection and successful transferability of the model for the binary classifier.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Mechanical
Peng Dai, Xingyu Liang, Kun Wang, Jianping Wang, Fengtao Wang, Guichun Yang
Summary: Accurate identification of faults in gearbox requires a clear understanding of its vibration response. Through establishing dynamic model and experimental observation, the vibration characteristics of gear-rotor-bearing systems with localized failures are investigated and discussed. The study reveals that periodic shock is generated due to the presence of localized failures, leading to enhanced vibration intensity at specific frequencies in the faulty part and the generation of harmonic frequency components.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Zhao Wei-qiang, Liu Jie, Zhao Wen-hui, Zheng Yang
Summary: This paper investigates the vibration characteristics of a gear system with pitting faults considering eccentricity and friction, analyzing the effects of the pitting area ratio on vibration features. By calculating time-varying meshing stiffness and solving vibrational differential equations using the energy approach, a comprehensive understanding of the system's vibration response is obtained. Through analysis in the time, frequency, and time-frequency domains, the influences of pitting faults are evaluated, with additional examination on the impact of eccentricity and friction.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Electrical & Electronic
Yang Liu, Yinghou Jiao, Shiyuan Qi, Guangbin Yu, Mengdi Du
Summary: In this study, a 2-DOF oscillator model with spring and damping elements was established to reveal the nonlinear dynamic behavior of gear rattling vibration caused by gear backlash. The influence of different restitution coefficients on gear impact-meshing motion was studied by numerical simulation. The results showed that the grazing bifurcation caused by gear backlash will lead to complex mapping structures of the system and the restitution coefficient directly affects the impact-meshing behavior.
Article
Engineering, Mechanical
Shuai Mo, Yingxin Zhang, Bingrui Luo, Heyun Bao, Guojian Cen, Yunsheng Huang
Summary: This paper studies the nonlinear global behavior evolution process of the non-orthogonal face gear-bearing system. By establishing a coupled vibration model and using the cell mapping method, the long-term evolution process of the system under different parameters is investigated, revealing the transition from periodic response to chaotic response and the coexistence of multiple responses.
MECHANISM AND MACHINE THEORY
(2022)
Article
Engineering, Multidisciplinary
Zhenyong Lu, Lun Liu, Xiaodong Wang, Yinghong Ma, Huizheng Chen
Summary: The paper presents a dynamic modeling and bifurcation analysis of a blade-disk rotor system supported by rolling bearing. The coupled dynamics model of the system is established considering the nonlinearity of rolling bearings and the flexible coupling between multi-stage blades and disk. Numerical simulations are used to obtain the steady-state responses and bifurcation characteristics of the nonlinear system. The results show that the blade mass and stiffness affect the resonance behavior of the linearized rolling bearing system, while blade length and Young's modulus significantly influence the motion patterns and bifurcation characteristics of the system.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Mechanical
Pengfei Wang, Hongyang Xu, Hui Ma, Hongzheng Han, Yang Yang
Summary: This paper analyzes the effects of axial, radial, and tilt misalignments on the dynamic characteristics of the planetary gear set-rotor system. It proposes a nonlinear restoring force model for ball bearings under different misalignment conditions. The dynamic model of the planetary gear set is established using the lumped parameter method, and the rotor is modeled using the Timoshenko beam element. The results show that misalignments reduce vibration amplitude but increase load-bearing area and contact load. Different types of misalignments also affect the varying compliance frequency amplitude of the bearing. The research provides a theoretical basis for fault diagnosis and identification of bearing misalignment in complex rotating machinery systems.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Acoustics
Shengnan Wang, Jianxing Zhou, Adayi Xieeryazidan
Summary: This paper focuses on the vibro-acoustic characteristics of gear-rotor-bearing coupled system under multi-source excitation. An improved dynamic model is developed to calculate the dynamic response, considering factors such as initial bending of shaft, precession effect, and gear eccentricity. An extended computational method is used to predict the radiation noise of the gearbox. Experimental measurements confirm the simulation results and the influences of precession effect on dynamic response and radiated noise are investigated.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2023)
Article
Engineering, Mechanical
Aijun Hu, Suixian Liu, Ling Xiang, Yue Zhang
Summary: This paper proposes a dynamic model for multi-stage planetary gear system with crack fault and analyzes the dynamic responses of the system using various analysis methods. The results show that the crack fault has a significant impact on the system's dynamic characteristics and may lead to chaotic motion.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
Jingyue Wang, Ning Liu, Haotian Wang, E. Jiaqiang
Summary: A torsional vibration model of planetary gear system is established based on lumped mass method, considering nonlinear factors such as friction, time-varying meshing stiffness, backlash, and comprehensive error. The system experiences multiple periodic and chaotic motions influenced by parameters like excitation frequency, damping ratio, comprehensive error amplitude, load and backlash, with tooth friction playing a significant role in shaping the system's bifurcation behavior.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
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, Multidisciplinary
Jing Liu, Shizhao Ding, Ruikun Pang, Xinbin Li
Summary: The study investigates the effects of different roller profiles on the vibrations of double row planetary gear systems (DPGS) and establishes a multi-body dynamic model to analyze the influencing factors. The results indicate that appropriate roller profiles, torque, and input speed can effectively control the vibrations of DPGS.
Article
Engineering, Mechanical
Xuanen Kan, Yanjun Lu, Fan Zhang, Weipeng Hu
Summary: A blade disk system is crucial for the energy conversion efficiency of turbomachinery, but differences between blades can result in localized vibration. This study develops an approximate symplectic method to simulate vibration localization in a mistuned bladed disk system and reveals the influences of initial positive pressure, contact angle, and surface roughness on the strength of vibration localization.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Zimeng Liu, Cheng Chang, Haodong Hu, Hui Ma, Kaigang Yuan, Xin Li, Xiaojian Zhao, Zhike Peng
Summary: Considering the calculation efficiency and accuracy of meshing characteristics of gear pair with tooth root crack fault, a parametric model of cracked spur gear is established by simplifying the crack propagation path. The LTCA method is used to calculate the time-varying meshing stiffness and transmission error, and the results are verified by finite element method. The study also proposes a crack area share index to measure the degree of crack fault and determines the application range of simplified crack propagation path.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Rongjian Sun, Conggan Ma, Nic Zhang, Chuyo Kaku, Yu Zhang, Qirui Hou
Summary: This paper proposes a novel forward calculation method (FCM) for calculating anisotropic material parameters (AMPs) of the motor stator assembly, considering structural discontinuities and composite material properties. The method is based on multi-scale theory and decouples the multi-scale equations to describe the equivalence and equivalence preconditions of AMPs of two scale models. The effectiveness of this method is verified by modal experiments.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Hao Zhang, Jiangcen Ke
Summary: This research introduces an intelligent scheduling system framework to optimize the ship lock schedule of the Three Gorges Hub. By analyzing navigational rules, operational characteristics, and existing problems, a mixed-integer nonlinear programming model is formulated with multiple objectives and constraints, and a hybrid intelligent algorithm is constructed for optimization.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Jingjing He, Xizhong Wu, Xuefei Guan
Summary: A sensitivity and reliability enhanced ultrasonic method has been developed in this study to monitor and predict stress loss in pre-stressed multi-layer structures. The method leverages the potential breathing effect of porous cushion materials in the structures to increase the sensitivity of the signal feature to stress loss. Experimental investigations show that the proposed method offers improved accuracy, reliability, and sensitivity to stress change.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Benyamin Hosseiny, Jalal Amini, Hossein Aghababaei
Summary: This paper presents a method for monitoring sub-second or sub-minute displacements using GBSAR signals, which employs spectral estimation to achieve multi-dimensional target detection. It improves the processing of MIMO radar data and enables high-resolution fast displacement monitoring from GBSAR signals.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xianze Li, Hao Su, Ling Xiang, Qingtao Yao, Aijun Hu
Summary: This paper proposes a novel method for bearing fault identification, which can accurately identify faults with few samples under complex working conditions. The method is based on a Transformer meta-learning model, and the final result is determined by the weighted voting of multiple models.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xiaomeng Li, Yi Wang, Guangyao Zhang, Baoping Tang, Yi Qin
Summary: Inspired by chaos fractal theory and slowly varying damage dynamics theory, this paper proposes a new health monitoring indicator for vibration signals of rotating machinery, which can effectively monitor the mechanical condition under both cyclo-stationary and variable operating conditions.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Hao Wang, Songye Zhu
Summary: This paper extends the latching mechanism to vibration control to improve energy dissipation efficiency. An innovative semi-active latched mass damper (LMD) is proposed, and different latching control strategies are tested and evaluated. The latching control can optimize the phase lag between control force and structural response, and provide an innovative solution to improve damper effectiveness and develop adaptive semi-active dampers.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Menghao Ping, Xinyu Jia, Costas Papadimitriou, Xu Han, Chao Jiang, Wang-Ji Yan
Summary: Identification of non-Gaussian processes is a challenging task in engineering problems. This article presents an improved orthogonal series expansion method to convert the identification of non-Gaussian processes into a finite number of non-Gaussian coefficients. The uncertainty of these coefficients is quantified using polynomial chaos expansion. The proposed method is applicable to both stationary and nonstationary non-Gaussian processes and has been validated through simulated data and real-world applications.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Lei Li, Wei Yang, Dongfa Li, Jianxin Han, Wenming Zhang
Summary: The frequency locking phenomenon induced by modal coupling can effectively overcome the dependence of peak frequency on driving strength in nonlinear resonant systems and improve the stability of peak frequency. This study proposes the double frequencies locking phenomenon in a three degrees of freedom (3-DOF) magnetic coupled resonant system driven by piezoelectricity. Experimental and theoretical investigations confirm the occurrence of first frequency locking and the subsequent switching to second frequency locking with the increase of driving force. Furthermore, a mass sensing scheme for double analytes is proposed based on the double frequencies locking phenomenon.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Kai Ma, Jingtao Du, Yang Liu, Ximing Chen
Summary: This study explores the feasibility of using nonlinear energy sinks (NES) as replacements for traditional linear tuned mass dampers (TMD) in practical engineering applications, specifically in diesel engine crankshafts. The results show that NES provides better vibration attenuation for the crankshaft compared to TMD under different operating conditions.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Wentao Xu, Li Cheng, Shuaihao Lei, Lei Yu, Weixuan Jiao
Summary: In this study, a high-precision hydraulic mechanical stand and a vertical mixed-flow pumping station device were used to conduct research on cavitation signals of mixed-flow pumps. By analyzing the water pressure pulsation signal, it was found that the power spectrum density method is more sensitive and capable of extracting characteristics compared to traditional time-frequency domain analysis. This has significant implications for the identification and prevention of cavitation in mixed-flow pump machinery.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xiaodong Chen, Kang Tai, Huifeng Tan, Zhimin Xie
Summary: This paper addresses the issue of parasitic motion in microgripper jaws and its impact on clamping accuracy, and proposes a symmetrically stressed parallelogram mechanism as a solution. Through mechanical modeling and experimental validation, the effectiveness of this method is demonstrated.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Zhifeng Shi, Gang Zhang, Jing Liu, Xinbin Li, Yajun Xu, Changfeng Yan
Summary: This study provides useful guidance for early bearing fault detection and diagnosis by investigating the effects of crack inclination and propagation direction on the vibration characteristics of bearings.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)