Article
Multidisciplinary Sciences
Qingyuan Xu, Shengwei Sun, Yi Xu, Changlin Hu, Wei Chen, Lei Xu
Summary: This study investigates the dynamic responses of a high-speed train running on a ballastless track under the temperature gradient. A dynamic model is developed and the results show that the proportion of initial force and stress caused by the temperature gradient differs for different calculation items. The maximum dynamic responses are not uniform along the track and the maximum accelerations occur when the fifth or sixth wheel passes the measuring point.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Mechanical
Lei Qin, Chengchao Guo, Wei Sun, Mingxu Zhang, Xuanxuan Chu, Fuming Wang
Summary: This study investigates the damage characteristics of the interface between CRTS II slab track and CA mortar, and proposes a bilinear cohesive zone model (CZM) to describe the mechanical behavior of the interface. The deformation and damage process of the interface are recorded using acoustic emission and digital image correlation techniques, and the effectiveness of the proposed CZM is validated through experimental data.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Xin Xin, Zunsong Ren
Summary: This study establishes a coupled rigid vehicle-flexible track multi-body dynamics model to investigate the influence of mortar disengagement on the dynamic responses of vehicle and track systems. The results indicate that mortar disengagement has minimal effect on the vehicle and track systems, except for significant impacts on the slab displacement and longitudinal tension stress.
APPLIED SCIENCES-BASEL
(2022)
Article
Acoustics
Jun Luo, Shengyang Zhu, Wanming Zhai
Summary: This paper extends the classical vehicle-track coupled dynamics theory by introducing track flexibility and advanced coupling relations into a three-dimensional train-slab track system. The model takes into account longitudinal coupling effects and flexible lateral vibration of track slab, which are often neglected in conventional dynamics models. The proposed dynamics model has been verified using ANSYS software and co-simulation technique, showing that dynamic responses are sensitive to longitudinal coupling effects and slab in-plane vibration, emphasizing the importance of accurate evaluations on train-slab track interactions.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Civil
Juanjuan Ren, Wei Du, Shijie Deng, Yuanjie Xiao, Haolan Li, Genyuan Tian
Summary: The study found that the viscoelastic deformation of CA mortar mainly occurs in the area from the end of the track slab to the third fastener under train loading, which can adversely affect the mechanical capability and deformation behavior of track structures. Considering the viscoelastic deformation of mortar, the maximum mortar stresses under passenger train and freight train loads are 2 to 3 times greater than those under normal conditions, and the vertical accelerations of rail and track slab are significantly larger as well.
KSCE JOURNAL OF CIVIL ENGINEERING
(2021)
Article
Engineering, Civil
Emil Aggestam, Jens C. O. Nielsen, Karin Lundgren, Kamyab Zandi, Anders Ekberg
Summary: This paper focuses on optimizing the dimensions and concrete types of slab tracks in order to minimize greenhouse gas emissions, while meeting the static dimensioning analysis requirement of the European standard. Using a 3D model, the dynamic vehicle-track interaction is analyzed, and contact forces and stress fields are calculated. The study concludes that the panel thickness can be reduced without risking crack initiation, and also develops a reinforced concrete model to predict crack widths and assess when steel reinforcement can be reduced.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Lei Xu, Hubing Liu, Zhiwu Yu
Summary: Modeling, evaluating, and predicting slab track damage and its evolution is currently a challenge and hot topic. This work presents finite element modeling methods and computer modules to compile a simulation program to evaluate slab track damage evolution. The necessity of considering combined fatigue and interfacial damages of slab tracks is illustrated.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Mechanical
Xin Xin, Zunsong Ren, Yi Yin, Jinsheng Gao
Summary: This paper proposes a new detection method for identifying the position and length of mortar void in ballastless slab track, which is difficult to be detected by traditional methods. The method combines vehicle response and a hybrid CNN-SVM classifier to efficiently detect mortar voids. Experimental results show that the proposed method can accurately detect over 90% of mortar void conditions, with higher identification precision for longer mortar voids.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Qingyuan Xu, Hao Sun, Lexuan Wang, Lei Xu, Wei Chen, Ping Lou
Summary: In this paper, a high-speed train-CRTS III slab track-subgrade coupled dynamic model is established to investigate the influence of vehicle number on dynamic characteristics. Results show that for conventional CRTS III slab track, only one vehicle is needed to study track dynamics, while for vibration reduction CRTS III slab track, at least two vehicles are required.
Article
Engineering, Mechanical
Jun Luo, Shengyang Zhu, Wanming Zhai
Summary: This paper discusses the impact of traction and braking operations on track structures in perilous mountain high-speed railways, introducing a novel vehicle-slab track vertical-longitudinal coupled dynamics model.
VEHICLE SYSTEM DYNAMICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Lei Xu, Zheng Li, Wen Bai, Liu Pan, Zhiwu Yu
Summary: With the rapid development of high-speed and urban rail transit, ballastless slab tracks have been widely used, but further research is needed on numerical simulation and dynamic analysis. This study proposes effective and easily programable methods using MATLAB? for vehicle-slab track interaction system construction and long length computation.
ADVANCES IN ENGINEERING SOFTWARE
(2021)
Article
Engineering, Geological
Qingzhi Ye, Qiang Luo, David P. Connolly, Tengfei Wang, Hongwei Xie, Haibo Ding
Summary: The aim of this study is to develop new knowledge about the dynamic behavior of concrete slab track systems enhanced with asphaltic underlays. A numerical simulation approach is used, which includes a coupled multi-body vehicle-track model and a 3D dynamic finite element track-ground model. The models are validated and used to simulate different thicknesses of asphaltic underlays, and the dynamic response is compared to analyze the stress, deflection, acceleration, and strain. The results indicate that stress concentrations occur near the concrete base joints, which should be considered in the design of asphaltic underlays.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Construction & Building Technology
Yukui Wang, Zhenxing He, Kaiyun Wang, Yanbo Bai, Penghao Li
Summary: To reduce the vibration induced by urban rail transit, a new Sleeper Damping Track with Elastic Side-Supporting Pads (SDTESSP) was proposed. The dynamic performance of the SDTESSP was evaluated through the development of a train-SDTESSP coupled dynamic model and a track-tunnel-soil finite element model. Field tests validated the models, showing good agreement in both the time and frequency domains. The vibration transmissibility of the SDTESSP, train-SDTESSP coupled interaction, and train-induced environmental vibration were investigated by comparing it with the Floating-Slab Track (FST), and the results revealed that the damping capacity of the SDTESSP can be similar to that of the FST by adjusting the material parameters of the elastic side-supporting pads.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Transportation Science & Technology
Lei Xu, Tao Lu
Summary: A straightforward and practical method of frequency-domain analysis is developed for coupled vehicle-track system. The influence of track flexibility and spatial coherence of irregularities on system response is systematically studied. Calculations show that track flexibility significantly affects wheel response while the resonance frequencies of car body motions remain unchanged. The spatial coherence of irregularities is important for the system response.
INTERNATIONAL JOURNAL OF RAIL TRANSPORTATION
(2021)
Article
Green & Sustainable Science & Technology
Wenqi Hou, Yong Zheng, Wei Guo, Guo Pengcheng
Summary: The designed PE-VEH system improves energy harvesting efficiency and has minimal impact on the practical operation of the train-SSFST bridge system. By strategically placing the PE-VEH at the end of the FCS, a better energy output efficiency can be achieved.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Automation & Control Systems
Zekui Lyu, Qingsong Xu, Limin Zhu
Summary: In this paper, a new piezoelectric-actuated biaxial compliant microgripper with long strokes is proposed for automatically gripping and rolling tiny rigid objects. The microgripper has been optimized structurally and its performance has been simulated using finite element analysis. Experimental results show that the developed microgripper has the capability to grasp and roll tiny rigid objects, making it promising for precision micromanipulation tasks such as optical fiber alignment.
IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Physical
Liying Zhu, Tianli Han, Xirong Lin, Zhonghua Chen, Chaoquan Hu, Jinyun Liu
Summary: A cost-effective carbonaceous material is prepared from biomass corn pod, and CuCo2O4 nanowires are grown on the surface to form a three-dimensional free-standing electrode for secondary batteries. The electrode shows high stability and low surface reaction barrier. It exhibits high performance as a Li-ion battery anode, with a capacity of 887 mAh/g after 250 cycles and a Coulombic efficiency above 99.7%. It also performs well as an Al-ion battery cathode and Na-ion battery anode, indicating potential for high-valuable energy-storage systems.
APPLIED SURFACE SCIENCE
(2023)
Article
Automation & Control Systems
Peng Guo, Yang Zhang, Weiwei Huang, Nuodi Huang, Long Zhang, Limin Zhu
Summary: In this paper, a generalized reaching-law-based discrete-time integral sliding-mode controller is designed to achieve high output tracking accuracy and avoid significant control efforts for both matched and mismatched disturbances. By synthesizing a disturbance-related integral term based on disturbance decomposition, the proposed sliding surface differs from existing integral sliding surfaces and is crucial for disturbance attenuation. The proposed reaching law introduces an adaptive exponential term into the control gains, which allows for the integration of conventional RL-based DISMC and EC-based DISMC.
ASIAN JOURNAL OF CONTROL
(2023)
Article
Automation & Control Systems
Zekui Lyu, Qingsong Xu, Limin Zhu
Summary: This article presents the design and development of a novel compliant vertical micropositioning stage (VMS) with a millimeter stroke and compact profile. The proposed stage design is inspired by lamina emergent mechanisms and is made of a plate-like material for out-of-plane motion. Analytical models of the stage's stiffness and resonant frequency are established and validated through simulation study. A prototype stage driven by a voice coil motor is fabricated for performance testing, which shows improved geometric advantages compared to existing vertical stages.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Materials Science, Characterization & Testing
Xiaochuan Niu, Liqiang Zhu, Zujun Yu, Xining Xu, Haikuo Shen
Summary: The continuous-welded rail (CWR) can generate longitudinal stress under temperature deviations from the neutral temperature (NT). Real-time monitoring of this longitudinal stress, or equivalently the NT, is a technical challenge. This paper explores the possibility of using nonlinear guided waves to detect the NT and investigates the effects of stress and temperature on the nonlinear parameter of different mode pairs. It is found that stress and temperature have significant influence on the nonlinear parameter, and decoupling their effects is crucial for NT detection. One mode pair shows a clear local minimum at NT, which can be used for NT detection without considering the coupling influence of temperature and stress.
NONDESTRUCTIVE TESTING AND EVALUATION
(2023)
Article
Optics
Bingxin Chen, Hong Pan, Liping Zhu, Hongtao Xu, Hengliang Wang, Lijian Zhang, Xiaomi Yan, Chiyuan Ma, Xuguang Xu, Wei Lu, Zhenghua An, Yanru Song
Summary: Superconducting photodetection offers wide spectral coverage and single photon sensitivity, but the detection efficiency is low in the longer wavelength infrared range. By using a superconducting metamaterial, we achieved nearly perfect absorption at dual color infrared wavelengths and enhanced light coupling efficiency. Our infrared detector demonstrated peak responsivity of 1.2 x 106 V/W and 3.2 x 106 V/W at two resonant frequencies, significantly higher than the non-resonant frequency. This work provides a way to improve the sensitivity of superconducting photodetectors in the infrared range.
Article
Astronomy & Astrophysics
Min-Yu Li, Sheng-Bang Qian, Li-Ying Zhu, Wen-Ping Liao, Er-Gang Zhao, Xiang-Dong Shi, Qi-Bin Sun
Summary: In this study, a corrected version of Kumar et al.'s model based on the Markov Chain Monte Carlo method was used to model 153 out of 173 Kepler HBSs, and the orbital parameters of these HBSs were determined. The results show that the orbital parameters of HBSs can be reliably derived using this method when compared with previous works.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Engineering, Environmental
Yuxian Wang, Chuang Li, Bowen Shen, Liying Zhu, Yangheng Zhang, Ling Jiang
Summary: A new type of nanozyme, Au/Pt NCs@GOX, which couples glucose oxidase (GOX) onto gold-platinum nanoclusters (Au/Pt NCs), has been developed. Through cascade catalytic reaction, it can fully utilize the nutrient-rich environment in the oral cavity to inhibit and eliminate the harmful bacteria F. nucleatum-induced biofilm. Animal experiments have demonstrated that this nanozyme has good safety and can effectively treat periodontitis in rats, reduce inflammation, and promote the regeneration of periodontal tissue.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Xiao-Bo Yang, Wei Li, Ze-Zhong Lin, Jing-Qi Liu, Hong-Xin Jiang, Hao Jia, Wei-Liang Jin, Xin-Long Hou, Bing-Xuan Du, Li-Na Zhu, De-Ming Kong
Summary: Efficient and selective adsorption/removal of Cs+ is crucial for resource utilization and radioactive pollution control. A PAN/PB aerogel with enhanced PB-loading capacity was prepared by pre-doping Fe3+ in PAN nanofibers. The PAN/PB aerogel exhibited interconnected porous structure, ultralight density, improved water stability, increased thermal stability, robust mechanical elasticity, high hydrophilicity, and excellent Cs+ adsorption selectivity. Its practical application potential was demonstrated by the highly efficient and selective adsorption/removal of Cs+ from simulated seawater and salt lake brine.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jiaxu Zhang, Lina Zhu, Chengbiao Wang, Jinxia Huang, Zhiguang Guo
Summary: In order to protect the iron core and heat sink of a mining transformer from damage caused by oil spills or the harsh mine environment, an air spray technology at room temperature was proposed to prepare antigreasy superamphiphobic coatings. These coatings have excellent repellency to liquids, physical and chemical resistance, and outstanding antifouling features, providing a feasible solution for protecting transformer components in the harsh environment.
Article
Computer Science, Interdisciplinary Applications
Yang Zhang, Wenze Zhang, Weiwei Huang, Yijun Shen, Nuodi Huang, Limin Zhu
Summary: This paper presents an improved skeleton curve-guided five-axis sweep scanning method for generating a more efficient scanning path for surfaces with multiple connected skeleton curves. By utilizing an integer linear programming optimization approach, the connection of inspection paths on independent surface patches is optimized, resulting in a shorter scanning path. Experimental results show that this method outperforms other methods.
ROBOTICS AND COMPUTER-INTEGRATED MANUFACTURING
(2023)
Article
Engineering, Chemical
Dong-xiao Cao, Yan Chen, Wei-liang Jin, Wei Li, Rui Wang, Ke Wang, An-na Tang, Li-na Zhu, De-ming Kong
Summary: Rapid and efficient removal of organic dyes from polluted water is important for environmental protection and water resources management. A new anionic covalent organic polymer (COP), named COPOH+CO, with the fastest dye adsorption kinetics so far, was synthesized. COPOH+CO showed a higher adsorption capacity for the cationic dye methylene blue (MB) compared to other COPs, indicating a synergy between its functional groups.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Automation & Control Systems
Dongfang Li, Binxin Zhang, Ping Li, Edmond Q. Wu, Rob Law, Xin Xu, Aiguo Song, Li-Min Zhu
Summary: This work presents an adaptive path-following controller for a multijoint snake robot (MSR) to enhance its adaptability to the environment. The proposed strategy estimates the time-varying parameters and external interference to dynamically adjust the robot's motion state. Estimations are used to compensate for joint torque, reducing path-following errors. Additionally, an anti-sideslip line-of-sight (LOS) guidance strategy is designed to prevent direction angle deviation, improving tracking accuracy and achieving stability.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2023)
Correction
Biochemistry & Molecular Biology
Zailong Tian, Yuzhou Zhang, Liping Zhu, Bin Jiang, Huiqin Wang, Ruxi Gao, Jiri Friml, Guanghui Xiao
Correction
Physics, Nuclear
C. Xu, H. Hua, X. Q. Li, J. Meng, Z. H. Li, F. R. Xu, Y. Shi, H. L. Liu, S. Q. Zhang, Z. Y. Li, L. H. Zhu, X. G. Wu, G. S. Li, C. Y. He, S. G. Zhou, S. Y. Wang, Y. L. Ye, D. X. Jiang, T. Zheng, J. L. Lou, L. Y. Ma, E. H. Wang, Y. Y. Cheng, C. He
