Article
Acoustics
Shiqian Chen, Kaiyun Wang, Chao Chang, Bo Xie, Wanming Zhai
Summary: A two-level adaptive chirp mode decomposition (ACMD) approach is developed in this paper for wheel flat detection on railway vehicles under variable-speed conditions. Both dynamics simulation and experiment results indicate that the proposed approach can accurately detect small-sized wheel flats under strong interferences.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Chemistry, Multidisciplinary
Araliya Mosleh, Pedro Aires Montenegro, Pedro Alves Costa, Rui Calcada
Summary: This study focuses on identifying the type and optimal position of sensors for wayside monitoring system to detect wheel flats, using 3D numerical simulation to identify flats and analyze the influence of sensor type and location on the accuracy of the detection system.
APPLIED SCIENCES-BASEL
(2021)
Article
Acoustics
Yue Zhao, Qiang Li, Jianwei Yang, Changdong Liu, Jinhai Wang
Summary: This paper develops a Lagrangian form dynamic model of a railway vehicle with a gear transmission system to explore the influence of wheel polygonal fault on the gear transmission system. The results show that the wheel polygonal fault has amplitude/frequency modulation effects on the gear system's time/frequency response and causes periodic fluctuations in the speed curve under traction conditions. The order of the wheel polygonal fault has a greater impact on rotational speed fluctuation than the amplitude in the non-resonant region.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Acoustics
Chaozhi Ma, Liang Gao, Yang Xu, Xiaopei Cai, Bowen Hou, Liangliang Wang
Summary: This study proposes an improved vibration model to understand the wheel polygonal wear mechanism on high-speed railways. Simulation schemes and indices are introduced to measure the growth degree of the wheel polygon at each order, and the correlation between wheel polygonal wear and wheel-rail coupled resonances is studied. The results show that both the track-bed vibrations and the improved fastener model have an impact on wheel polygonal wear, while the track-bed broadband modal vibrations have a minor contribution.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Civil
Hutang Sang, Jing Zeng, Yayun Qi, Caihong Huang, Jian Mu
Summary: This study predicts and analyzes the wheel wear of high-speed railway vehicles during the acceleration process, which is of great importance for improving operating characteristics and developing friction management strategies near railway stations, especially in complex climatic environments. Detailed dynamic models and a comprehensive gear transmission system are used to accurately capture the dynamic responses of the motor car. The influence of friction coefficient is considered by setting the length of the simulated track interval with different friction coefficients according to the Gaussian distribution function. A Proportional-Integral(PI) creep controller is introduced to adapt to varying wheel-rail contact conditions, and a wheel wear prediction model based on the aforementioned submodels is established.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART F-JOURNAL OF RAIL AND RAPID TRANSIT
(2023)
Article
Thermodynamics
Wei Guo, Yan Long, Zhenyu Bai, Xiaobo Wang, Hanyun Liu, Zhen Guo, Sui Tan, Hui Guo, Yuquan Wang, Yongkang Miao
Summary: This paper proposes a variable stiffness triboelectric nano-generator (VSTENG) for harvesting vibration energy from high-speed railway bridges. The working principle and theoretical models of VSTENG are introduced, and numerical and finite element models are established. The results show that the VSTENG can generate nonlinearity vibrations in a wide frequency range and has a high energy-harvesting capacity, which is verified by shake table tests.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Mechanical
Jingmang Xu, Qiantao Ma, Siqi Zhao, Jiayin Chen, Yao Qian, Rong Chen, Ping Wang
Summary: The study found that, compared to a normal wheel and a wheel flat on the interval rail, a wheel flat on the wheel load transition of the frog area will excite greater vertical wheel-rail forces and vertical axle box vibration acceleration when crossing a turnout. In the turnout area, the main frequency band of the vertical vibration acceleration of the axle box is 550-800 Hz, which is rarely affected by the size of flats or the speed of the vehicle. The third-order bending mode of the wheel is excited when the wheel transits from the wing rail to the point rail.
VEHICLE SYSTEM DYNAMICS
(2022)
Article
Engineering, Mechanical
Ahmed Guerine, Bilal Abderezzak, Abdelkhalak El Hami
Summary: This paper presents an uncertainty analysis of a two-stage gear system. The Chaos Polynomial method is used to investigate the influence of angle uncertainty on the dynamic response of the system, and the Monte Carlo simulation is employed to verify the suitability and accuracy of this method.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Multidisciplinary
Bao Zhang, Xiaoping Su
Summary: The control of high-speed rocking vibration of the steering wheel is crucial for vehicle comfort performance. The most effective method is through the reasonable design of wheel alignment parameters. However, under high-speed driving conditions, the wheel alignment parameters change dynamically, intensifying the vibration of the steering wheel. Therefore, it is meaningful to study and control the dynamic characteristics of wheel alignment parameters.
Review
Chemistry, Analytical
Wenjie Fu, Qixin He, Qibo Feng, Jiakun Li, Fajia Zheng, Bin Zhang
Summary: Wheel flats are common surface defects in railway wheels that can cause high wheel-rail contact forces and lead to rapid deterioration and failure if not detected early. Timely and accurate wheel flat detection is crucial for ensuring train safety and reducing maintenance costs. This paper reviews recent wayside deployment techniques and signal processing methods for wheel flat detection. Sound-based, image-based, and stress-based methods are introduced and summarized, along with their advantages and disadvantages. The paper also discusses signal processing methods for different detection techniques. The future direction of wheel flat detection is believed to be focused on simplification, sensor fusion, algorithm accuracy, and operational intelligence, particularly with the development of machine learning algorithms and railway databases.
Article
Engineering, Chemical
Xueping Wang, Jun Zhang, Jianyong Zuo
Summary: In this paper, a wheelset-rail finite element model was established for contact analysis, and a calculation method for wheel tread wear was proposed. The study found that there was a small difference between the predicted wear amounts and the measured data, and the predicted worn profiles had the same change trend as the measured profiles. This calculation method has high computational efficiency and reliability, and it has significant research significance and practical value.
Article
Thermodynamics
Kihan Kwon, Junhyeong Jo, Seungjae Min
Summary: In the development of electric vehicles, multi-speed transmissions are an alternative to single-speed transmissions that require optimization of gear ratios and shifting patterns. The transmission efficiency depends on torque, speed, and drive gear, directly impacting the optimal design. By considering variable transmission efficiency, energy efficiency and dynamic performance can be improved compared to single-speed transmissions.
Article
Materials Science, Multidisciplinary
Y. Lei, T. Li, M. Y. Su, C. Li, H. Y. Wang, T. Cong, L. H. Dai
Summary: Using the SHPB with hat-shaped punch shear technique, the adiabatic shearing behavior in the web and the rim of high-speed train railway wheel steel was investigated. Different initial microstructure characteristics were observed in the web and rim specimens with different heat treatment. It was shown for the first time that pre-eutectoid ferrite deforms at first and pearlite interlamellar spacing influences the structural softening sequence during shear band evolution in the railway wheel steel, with shear bands more prone to emerge in the rim.
Article
Engineering, Mechanical
Yue Zhao, Qiang Li, Jianwei Yang, Aihua Zhu, Jinhai Wang, Changdong Liu
Summary: Wheel polygonalization is a common failure in wheelsets that can impact the safety and comfort of railway vehicles. This study aims to clarify the formation mechanism of fault signals under variable speed conditions for improved feature extraction accuracy. The results show that the dynamic evolution of fault statistical characteristics is positively correlated with speed and fault severity, with sharper fluctuations under braking conditions.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Jianfeng Sun, Enrico Meli, Xinwu Song, Maoru Chi, Weidong Jiao, Yonghua Jiang
Summary: This paper presents a monitoring system for hunting motions of high-speed railway vehicles, which takes into account real-time wheel/rail contact relationships. The proposed system predicts the lateral displacement and yaw angle of the wheelset, as well as the wheel/rail contact relationships, in an efficient, effective and low-cost way. The Hankel matrix-based singular value decomposition method is applied for prediction using the collected bogie lateral accelerations as inputs. The wheel/rail contact analysis is performed using the look-up table method for real-time performance. The accuracy and efficiency of the proposed method are validated through comparisons with simulated and experimental results.
VEHICLE SYSTEM DYNAMICS
(2023)
Article
Engineering, Manufacturing
Deepak Kumar, Ravi Shankar Rai, Vivek Bajpai, Nirmal Kumar Singh
Summary: This study presents an accelerated growth technique for the fabrication of 2D assembly of ZnO nanostructures and investigates the impact of concentration variance on their morphology. The results show that ZnO nanostructures grown at different concentrations exhibit distinct morphologies and crystal structures.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
Article
Energy & Fuels
Ka Zhang, Jianwei Yang, Changdong Liu, Jinhai Wang, Dechen Yao
Summary: This paper establishes an electromechanical coupling model of a high-speed train and investigates the characteristics of the traction drive system during train operation. Numerical simulation results show that the meshing frequency and high harmonics rotation frequency affect the stator current, and there are differences in the RMS values of the current during traction and braking.
Article
Engineering, Mechanical
Jinhai Wang, Jianwei Yang, Yunlei Lin, Yuping He
Summary: This study analyzes the impact of different profile shifts on the time-varying meshing stiffness (TVMS) and dynamic characteristics of gear systems. Positive individual shifts decrease gear tooth stiffness and TVMS, leading to stronger vibrations, while negative shifts increase tooth stiffness and TVMS, reducing vibration. Compound shifts in S-gearing have a slight impact on TVMS but significantly affect the dynamic characteristics.
MECHANISM AND MACHINE THEORY
(2022)
Article
Transportation Science & Technology
Jinhai Wang, Jianwei Yang, Yuzhu Wang, Yongliang Bai, Tieling Zhang, Dechen Yao
Summary: The study proposes an ensemble decision approach that combines the dislocated time-frequency representation and a pre-trained convolutional neural network for evaluating the health status of railway vehicle gearboxes. Experimental results show that continuous wavelet transform and synchrosqueezed transform outperform time-domain signal and short-time Fourier transform in diagnostic performance. Additionally, the dislocated operation helps the CNN learn characteristics of continuous signals more deeply and increases the sample size, leading to improved accuracy and stability in diagnosis.
INTERNATIONAL JOURNAL OF RAIL TRANSPORTATION
(2022)
Article
Computer Science, Interdisciplinary Applications
Jianwei Yang, Fu Liu, Aihua Zhu, Jinhai Wang, Dechen Yao, Xiaohui Wang, Ziming Kou
Summary: The study designed a virtual reality guidance system for teaching urban railway vehicle overhaul skills, aiming to improve students' enthusiasm and gains from learning.
COMPUTER APPLICATIONS IN ENGINEERING EDUCATION
(2022)
Article
Materials Science, Multidisciplinary
Mohan Kumar, Vivek Bajpai
Summary: This paper studies the formation mechanism of top burr in downmilling operation on Ti6Al4V. The mechanism shows that top burr is a combination of tear material from upmilling and deformed material from side bulging. Various shapes of top burr formation at different cutting parameters were explored. Three types of burr formation were found, which significantly affected the surface finish after milling. The effect of feed per tooth and depth of cut on top burr formation and surface roughness was analyzed, and an optimum parameter was proposed for better output response.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Multidisciplinary
Minghui Wei, Jianwei Yang, Dechen Yao, Jinhai Wang, Zhongshuo Hu
Summary: This paper proposes a bearing fault detection method that combines empirical mode decomposition and adaptive time-varying parameter short-time Fourier synchronous squeezing transform (AFSST). Experimental results show that this method has better time-frequency resolution and energy-efficient compression rate, and it has good diagnostic ability and robustness under multiple operating conditions.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2022)
Article
Polymer Science
Li Jiafeng, Jiang Pengfei, Yang Jianwei, Fan Tiantang, Yang Hongbo, Sui Junhui, Cao Lu
Summary: The shape memory properties of 3D-printed b-PLA vascular stent are studied and compared with PLA. The b-PLA stent exhibits excellent shape recovery rate and self-expanding properties, while maintaining good cell compatibility. The results confirm the potential of b-PLA stent for biomedical applications.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Engineering, Manufacturing
Deepak Kumar, Mangal Singh Sisodiya, Vivek Bajpai
Summary: The purpose of this paper is to evaluate the feasibility of a novel gap-controlled strategy for micro-EDM process using magnetic levitation. The experiments showed that the developed technology achieved uniform and smooth discharge without arcing and short circuits, with high material removal rate and low tool wear rate and surface roughness. Compared to traditional EDM, the maglev mu-EDM is more stable.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2023)
Article
Engineering, Civil
Chaochao Ma, Aihua Zhu, Fan Zhang, Jianwei Yang, Peiwen Sun
Summary: This study investigates the combined effect of aerodynamic loads arising during the process of two high-speed trains passing each other (TPEO) and different track excitations on wheel wear. The results show that TPEO increases wheel wear under different track excitations, especially at the moment of TPEO.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART F-JOURNAL OF RAIL AND RAPID TRANSIT
(2023)
Article
Engineering, Mechanical
Rajesh Sahoo, Nirmal Kumar Singh, Vivek Bajpai
Summary: This research aims to model the material removal process of EDM by analyzing the real-time V-I waveforms during the spark occurrence. The experiments conducted on Titanium grade-5 alloy verify the model and show that gap voltage is the most significant parameter affecting the material removal rate. SEM and EDS analysis confirm the presence of surface alloying.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Materials Science, Composites
Ravi Shankar Rai, Vivek Bajpai
Summary: Hydrothermal technique was used to deposit CuO nanostructures on woven carbon fibers (WCF) to enhance the mechanical properties of epoxy resin composites. The results indicated that the CuO-coated WCF reinforced epoxy resin composites exhibited improved impact strength, tensile strength, and in-plane shear strength.
POLYMER COMPOSITES
(2023)
Article
Engineering, Mechanical
Arnab Das, Abisoor Rishi Sharan Mundu, Vivek Bajpai
Summary: This study proposes an approach to improve the tribological performance of lead free brass in high-speed micro turning by incorporating hybrid cryogenic cooling. Liquid nitrogen and vegetable oil-based MQL are supplied simultaneously to the machining interface. The performance is compared with cutting oil-based MQL and cryogenic cooling. The results show that the hybrid cooling strategy significantly improves surface quality, reduces burr formation, and decreases tool wear, providing steady state performance.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Manufacturing
Arnab Das, Vivek Bajpai
Summary: This article proposes a strategy to generate a lubricating passage on turning inserts, with the aim of minimizing friction and cutting force. The lubricating passage consists of micro grooves on the insert along the normal plane, allowing for the favorable flow of lubricant and removal of chips. As a result, a better lubricating interface is formed at the chip-tool contact zone, leading to reduced friction and cutting force. When combined with Minimum Quantity Lubrication (MQL), these inserts have achieved a maximum 55% reduction in cutting force. Additionally, they have also shown significant reductions in flank wear and average surface roughness, and have acted as chip breakers.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Engineering, Mechanical
Willy Ank de Morais, Railson Bolsoni Falcao, Mario Boccalini Jr, Fernando Jose Gomes Landgraf
Summary: This study compares the fatigue behavior of bcc Nb-48 wt%Ti (Ti-36at%Nb) alloy parts processed by Laser Powder Bed Fusion (L-PBF) using two different types of powders (spherical powder produced by Plasma Atomization and irregularly shaped powder produced by Hydride-Dehydride). The results show that the fatigue behavior is similar for both powders, but the specimens produced from the Hydride-Dehydride powder have higher dispersed results. Fracture primarily occurs in the porosities near the machined sample surface, and the fatigue cracks propagate in a zigzag mode parallel to the L-PBF building direction.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Guoxi Jing, Shuai Sun, Teng Ma, Shubo Li, Tian Ma, Junchao Wei, Jianchao Pang
Summary: This study proposes a parameter identification method for predicting the TMF life of CGI materials used in cylinder heads. The study evaluates the TMF behavior of RuT450 material and successfully predicts its TMF life using multi-objective optimization. The results highlight the influence of plastic strain amplitude, temperature, and strain rate on the damage mechanism and life prediction.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xin Zhang, Xu Li, Weipeng Xu, Kuidong Gao, Kao Jiang, Xinyu Wang, Hongxin Wei
Summary: Conical picks are commonly used in tunnel excavation and often experience high temperatures during the cutting process. This study investigated the influence of temperature on the wear of conical picks and proposed a method for measuring rock abrasiveness that takes into account the thermal effect. The experimental results showed that cooling liquid reduced the maximum temperature and the mean mass loss of the conical pick. Additionally, the study examined the characteristics of oxygen and found evidence of peeling, cracking, and oxidation on the grinding rod used for rock abrasiveness measurement.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Vivek Srivastava, Deependra Singh, A. G. Rao, V. P. Deshmukh
Summary: Engine gear failures are a significant concern in various industries. Investigating each gear failure and determining the root cause is important for preventing future failures. This study used experimental and numerical analysis techniques to investigate the premature failure of a flywheel gear in a marine diesel engine. The findings revealed that the gear failed due to overload stresses caused by overload torque generated from sudden inertial thrust in the internal combustionengine.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Jun Zhang, Weidong Liu, Feilong Liu, Zhiqiang Yang, Jinfang Peng, Minhao Zhu
Summary: During a major overhaul of an aeroengine, a cracked stator vane of the low-pressure compressor was discovered, with the crack originating from a corrosion pit located on the arc transition between the leading edge and the upper edge plate. The fracture surface exhibited signs of fatigue cracks, indicating a pit-related fatigue crack. Metallographic examination revealed that most corrosion pits were distributed beneath the bulging or peeling paint layer on the leading edge and the concave side. Identification of the corrosion products showed the presence of sulfate and alumina, suggesting atmospheric corrosion as a likely cause for the cracked stator vane.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Juan Jose Jimenez de Cisneros Fonfria, Ester Olmeda, Susana Sanz, Maria Garrosa, Vicente Diaz
Summary: Energy absorbing devices in vehicles can partially transform impact energy and protect passengers. In this paper, the failure analysis of the underframe crumple zone in a train car was conducted through finite element simulations, showing that the component acted properly after the impact.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Fengqi Zhang, Gang Luo, Haiyang Zhang, Peihong Cong, Lulu Liu, Wei Chen
Summary: In this study, a predictive model for bird strike trajectory was developed based on the quasi-linear viscoelastic model. By combining simulation analysis under multiple conditions, the model reproduced the trajectory change law in low and medium speed bird impact experiments.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
S. M. de Gouveia, L. de Abreu Correa, D. B. Teles, M. Oliveira, T. G. R. Clarke
Summary: Emergency Shutdown Valves (EDSVs) are used in industrial applications to interrupt fluid flow during hazardous events. The damage to the valve seats can be detected by analyzing the pressure and torque data. This study compared three processing options and found that evaluating the complete signature with a Gradient Boosting Classifier algorithm is the most effective strategy.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xinyan Jin, Kai Wang, Hongwei Qian
Summary: This study investigated the root cause of an abnormal premature groove-clogging failure on a sink roll in a hot-dip galvanizing line. It was found that the failure was caused by the buildup of a large amount of Fe2Al5Znx dross in the grooves, and the key factor was the control of Tstrip.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Zhiqiang Li, Jie Li, Cen Li, Xiaodong Xie, Zhiyong Yang
Summary: In this study, the microstructure evolution of the material in the hot spot area of the high-speed train brake disc was observed and the mechanism of mechanical property degradation was obtained through tensile tests. The research results provide guidance for crack damage identification of the brake disc and condition-based maintenance.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Lijia Luo, Yincheng Wang, Wei Chen, Zuming Zhao, Wenfei Chen, Shiyi Bao
Summary: Tube-to-tube impact wear is a significant factor in the failure of alloy 690 tubes in nuclear steam generators. This paper investigates the wear damage mechanism and detection method of alloy 690 tubes under tube-to-tube impact loads. The results reveal the wear damage mechanism through analysis of macro and micro morphologies as well as metallographic structures. A nonlinear ultrasonic wave mixing method is proposed for damage detection and a detection device is developed to implement this method. Experimental results indicate that the damage mode of tube-to-tube impact wear varies with impact load and cycle number, and the nonlinear modulation index is effective in assessing the damage degree of alloy 690 tubes.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xing-Ju Yang, Feng Lin, Xu Du, Lu Qiu
Summary: This paper proposes a novel method of improving the progressive collapse resistance of RC frame structures by adding locally debonded kinked steel plates (KPs). Experimental tests and finite element analysis reveal that the addition of KPs significantly enhances the ultimate resistance and deformability of the beam-slab substructures. The mechanism of resistance improvement is explained, and an analytical model is developed for predicting the ultimate resistance of the structures.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xiaohe Wang, Zengqiang Cao
Summary: This paper presents a dynamic installation (DI) method based on electromagnetic force to reduce damage to composite laminates and improve joint performance. The study shows that DI can effectively decrease installation resistance, reduce severe damage to laminates, and improve stress distribution in the joint.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Jitong Cui, Yingying Kong, Cuiwei Liu, Baoping Cai, Faisal Khan, Yuxing Li
Summary: This paper presents a method for quantifying the failure probability of hydrogen doped pipelines and utilizes Bayesian network for quantitative calculation. The results show that this method can more accurately assess the failure probability of hydrogen doped pipelines and provide a decision basis for preventing failure accidents.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Yiping Jiang, Maoru Chi, Jungang Yang, Liangcheng Dai, Yuchen Xie, Zhaotuan Guo
Summary: This article investigates and simulates the derailment of empty freight trains at the switch section of a turnout in the diverging route, and proposes preventive measures. The results show that the derailment is caused by the combined effect of various factors, and reducing the longitudinal coupler force and the wheel rail friction coefficient can decrease the possibility of derailment. Additionally, installing a guard rail in front of the turnout can effectively prevent derailment.
ENGINEERING FAILURE ANALYSIS
(2024)
