Article
Acoustics
Yi Yang, Jinyuan Tang, Niaoqing Hu, Guoji Shen, Yuehao Li, Lun Zhang
Summary: This study proposes a comprehensive time-varying mesh stiffness calculation method considering the crack position and emphasizes the influences of two tooth crack types. The applicability and accuracy of the method are validated using the finite element method, and the effects of crack on gear dynamic characteristics are investigated. Several statistic parameters are applied to evaluate the health conditions for the spur gear system.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Mechanical
Siyu Wang, Rupeng Zhu
Summary: This study focuses on the gear crack in helical gear pair, and introduces improved models for spatial crack propagation paths and limiting line to characterize the crack effect. The influence of crack parameters and types on the time varying mesh stiffness of helical gear pair is also investigated.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Yanan Wang, Hao Wang, Keyuan Li, Baijie Qiao, Zhixian Shen, Xuefeng Chen
Summary: This paper investigates the influence of time-varying mesh stiffness (TVMS) on the vibration of gear transmission systems, focusing on spiral bevel gears. The analytical models for perfect and cracked gears are established to evaluate TVMS, and the effects of crack length and depth on mesh stiffness and dynamic response are studied. Experimental results confirm the significant impact of tooth crack faults on the gear response.
MECHANISM AND MACHINE THEORY
(2023)
Article
Engineering, Mechanical
He Dai, Feng Chen, Chao Xun, Xinhua Long
Summary: This paper proposes a numerical method for calculating the dynamic mesh forces of planetary gear transmissions, with experimental validation showing good agreement between the calculated and measured forces. The effects of addendum modification on time-varying mesh stiffness are considered, and an experimental method using gear tooth root-fillet strain signals is developed to measure the dynamic ring-planet mesh forces.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Jieyu Ning, Zaigang Chen, Yunsheng Zhi, Xia Hua, Wanming Zhai
Summary: An improved method based on the theory of elastic mechanics for circular ring is proposed in this paper to accurately calculate the mesh stiffness of spur gears with tooth root crack. The calculated results are validated by the finite element method, and the effects of different parameters on the stiffness are investigated.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
Lantao Yang, Desheng Zou, Xiuquan Sun, Liming Wang, Yimin Shao, Fengshou Gu, Andrew Ball, David Mba
Summary: This paper proposes a new TVMS calculation model for cracked gears considering tip relief (TR), which is verified by finite element method and reveals the effects of TR, load and crack parameters on TVMS and dynamic characteristics of gears.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
Abderrahim Baccar, Nuno Dourado, Ali Akrout, Ahmed Hammami, Fakher Chaari, Mohamed Haddar
Summary: Polymer spur gears have advantages over metallic gears in terms of cost, weight, and corrosion resistance. This study focuses on the mechanical behavior of a polymer spur gear, with and without cracks, using the extended finite element method with cohesive approach to analyze the effect of crack propagation on mesh stiffness. The results show that crack initiation occurs in the fillet radius and propagates into the tooth thickness. Dynamic responses are further analyzed for healthy and cracked tooth gearboxes using the obtained mesh stiffness.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Akash Patel, Piyush Shakya
Summary: This article discusses the impact of cracks on gears, proposes a model for simulating crack propagation path, explores a method for handling non-stationary signals, and introduces a new state feature for severity level classification. The effectiveness of the simulation model is validated through experiments.
MECHANISM AND MACHINE THEORY
(2021)
Article
Engineering, Mechanical
Zimeng Liu, Erliang Shang, Yifan Huangfu, Hui Ma, Jiazan Zhu, Songtao Zhao, Xinhua Long, Zhanwei Li
Summary: This study investigates the vibration characteristics of gear systems operating at high speeds and under heavy loads in the presence of multi-tooth spalling faults. By establishing a time-varying meshing stiffness model and a flexible helical gear dynamic model, the effects of rotational speed, spalling surface morphology scale, spalling depth, and location of spalling occurrence on the meshing process and vibration response are analyzed.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Oguz Dogan, Onur Can Kalay, Fatih Karpat
Summary: Gears are critical machine elements that transmit power and motion, but they may suffer from faults due to various factors. This study investigates the influence of tooth root cracks on the single-tooth and meshing stiffness characteristics of standard and asymmetric involute spur gears. The results show that tooth cracks can decrease gear stiffness, and factors such as backup ratio and tooth asymmetry also affect the stiffness characteristics.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Mechanical
Hongzheng Han, Hui Ma, Hongxu Tian, Zhike Peng, Jiazan Zhu, Zhanwei Li
Summary: This paper proposes a three-dimensional loaded tooth contact analysis model considering the variation of the center distances and tooth root crack fault in a planetary gear train (PGT). The time-varying meshing stiffness caused by the crack fault of the planet gear and the radial assembly error of the output shaft is revealed. By introducing the time-varying meshing stiffness as the vibration excitation source into a coupling PGT-shaft dynamic model, the dynamic response under the joint influence of assembly error and crack fault is calculated. A signal decomposition method based on the distribution law of sidebands is proposed, which separates the sidebands caused by the assembly error and the crack fault. The proposed signal decomposition method improves the accuracy of diagnosing the crack fault of the planet gear under the influence of the radial assembly error of the output shaft, as validated by condition indicators (CIs).
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Chongyang Xie, Wei Yu
Summary: In this paper, a new gear dynamic model is proposed based on the real-time gear mesh stiffness (GMS). The model is validated by comparing the simulated results with experimental results, showing that it provides more reasonable predictions for gear dynamic response.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Lantao Yang, Liming Wang, Yimin Shao, Chris K. Mechefske, Qiuyuan Chen
Summary: A new calculation method is proposed in the study to accurately consider the impact of tooth and rim cracks on tooth fillet foundation stiffness, which is validated by finite element method results. The proposed method can be employed for more accurate calculation of mesh stiffness of cracked gears and further serve the fault diagnosis process of spur gear systems.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Mechanical
Zhixian Shen, Laihao Yang, Baijie Qiao, Wei Luo, Xuefeng Chen, Ruqiang Yan
Summary: In this study, a model of mesh relationship with gear wear is established, and the vibration characteristics of gear wear are investigated. The results indicate that gear wear does not change the structure of the spectrum, but it alters the amplitude of the meshing frequencies and their sidebands. Several condition indicators can be used as important bases for judging the gear wear state.
FRONTIERS OF MECHANICAL ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Hongzheng Han, Hui Ma, Haixu Wang, Jiazan Zhu, Zhanwei Li, Zimeng Liu
Summary: This study investigates the tooth root crack fault of the spiral bevel gear pair (SBGP) by establishing a finite element model and performing tooth contact analysis. The maximum tooth root stress is analyzed considering assembly errors, and the tooth root crack fault of the bevel pinion with different crack degrees is simulated. The time-varying mesh stiffness (TVMS) of the SBGP with different degrees of the pinion tooth root crack fault is obtained. The sensitivities of various statistical indicators for identifying the tooth root crack fault of SBGP under the influence of assembly errors are verified. This paper provides a necessary theoretical basis for the analysis and diagnosis of tooth root crack faults in the SBGP transmission system.
Article
Engineering, Mechanical
Omar D. Mohammed, Matti Rantatalo, Jan-Olov Aidanpaa
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2015)
Article
Engineering, Mechanical
Omar D. Mohammed, Matti Rantatalo, Jan-Olov Aidanpaa
ENGINEERING FAILURE ANALYSIS
(2013)
Article
Instruments & Instrumentation
O. D. Mohammed, M. Rantatalo
Article
Engineering, Mechanical
Omar D. Mohammed, Matti Rantatalo, Jan-Olov Aidanpaa, Uday Kumar
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2013)
Article
Engineering, Mechanical
Ahmed Shehata, Md Asif Adnan, Omar D. Mohammed
ENGINEERING FAILURE ANALYSIS
(2019)
Article
Computer Science, Interdisciplinary Applications
Omar D. Mohammed, Akshay D. S. Bhat, Peter Falk
Summary: In this article, a structured approach combining meta-models and robust optimization is developed to effectively change the tooth flank contact pattern. This approach can reduce noise, vibration, and harshness (NVH) while improving the durability of gears. By using this method, a unique optimal design solution can be obtained.
SIMULATION MODELLING PRACTICE AND THEORY
(2022)
Proceedings Paper
Health Care Sciences & Services
Omar D. Mohammed, Sadok Sassi
Summary: This paper proposes an experimental method to detect and quantify cracks in spur gear teeth using modal analysis, and validates the frequency response functions obtained analytically through experimental validation. The results of modal analysis show a significant deviation in response peak location for cracked teeth, with larger deviations observed for bigger crack sizes. This experimental validation supports the previous analytical method using frequency response functions.
2022 PROGNOSTICS AND HEALTH MANAGEMENT CONFERENCE, PHM-LONDON 2022
(2022)
Review
Engineering, Mechanical
Omar D. Mohammed, Matti Rantatalo
ENGINEERING FAILURE ANALYSIS
(2020)
Proceedings Paper
Engineering, Mechanical
Omar D. Mohammed, Matti Rantatalo
ADVANCES IN CONDITION MONITORING OF MACHINERY IN NON-STATIONARY OPERATIONS
(2014)
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)
