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Research on the power generation efficiency of bladeless wind turbines under different degrees of freedom based on bidirectional fluid-solid coupling

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Zhendong yu Chongji/Journal of Vibration and Shock 2025年第12期44卷 150-161页

作者： Wei, Hongwei Liu, Kan Wei, Keqin Jia, Yaya Liu, Qingkuan School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province Shijiazhuang050043 China

A simplified model of the bladeless wind turbine was established and the formula for its power generation efficiency was derived. Numerical simulations were conducted using computational fluid dynamics software Fluent and user-defined functions (UDF), studying the vortex-induced vibration characteristics and power generation efficiency of single and dual degree-of-freedom bladeless wind turbines under different reduced wind speeds. The study shows that the difference in the degrees of freedom of the wind turbine significantly affects its vibration response, aerodynamic characteristics and power generation efficiency. The vibration amplitude initially increases and then decreases as the reduced wind speed increases, remaining stable in certain wind speed ranges. The vibration trajectory of the dual degree-of-freedom wind turbine at reduced wind speeds primarily forms a figure-eight pattern, exhibiting multi-frequency vibrations when the wind speed approaches the natural frequency, with the trajectory becoming chaotic. The power generation efficiency follows a trend of increasing first and then decreasing with the changing reduced wind speed, with the efficiency of the dual degree-of-freedom wind turbine being higher than that of the single degree-of-freedom wind turbine. At a reduced wind speed of Ur = 2. 4, the maximum power generation efficiency of the single degree-of-freedom wind turbine is 25. 19%;at Ur = 3.4, the maximum power generation efficiency of the dual degree-of-freedom wind turbine is 57. 14%. Power generation efficiency is influenced by the combined effects of incoming wind speed, vibration velocity, and lift-drag coefficients. With changes in degrees of freedom and reduced wind speeds, the wake vortex shedding patterns of the wind turbine also vary. The vortex shedding patterns of the three-dimensional bladeless wind turbine at different heights in the span direction are similar to those of the two-dimensional wind turbine, but due to smaller vortice

关键词： Energy dissipation

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The Influence of Parameter Optimization of Rubber Nodes in High-Speed train Turning Arms on Suppressing Hunting Motion

The Influence of Parameter Optimization of Rubber Nodes in H...

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International Conference on Artificial Intelligence and Autonomous Transportation, AIAT 2024

作者： Guo, Tao Li, Ya Liu, Yongqiang Zhan Tianyou College Dalian Jiaotong University Dalian116028 China CRRC Tangshan Co. Ltd. Tangshan063000 China Shijiazhuang Enric Gas Equipment Co. Ltd. Shijiazhuang051000 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China

ISBN: (纸本)9789819639724

To solve the problems of frequent occurrence of lateral instability and abnormal wear of the tread surface during the service of high-speed trains, the stiffness characteristics and its parameters optimization of the rotating arm rubber node were analyzed in this paper. A high-speed train dynamic model was established using the dynamic analysis software Universal Mechanism with a type of 350 km/h high-speed train in China as the research object. Based on the mechanism of primary and secondary vehicle instability, the phenomena of abnormal hunting of the vehicle body and abnormal vibration of the bogie was reproduced through simulation, and the vehicle response and hunting characteristics were analyzed. The Poynting Thomson model, which can represent the stiffness frequency variation characteristic of rotating arm rubber node, was optimized by the genetic optimization algorithm. The research results indicate that the optimized arm node has a significant inhibitory effect on the instability of primary and secondary hunting movements. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Railroad transportation

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A study on the discrete element simulation of heterogeneous asphalt under freeze–thaw cycles

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Discover Civil engineering 2025年第1期2卷 1-19页

作者： Xu, Shuo Yan, Zhanyou Zhang, Yijunjie Zhao, Li Chang, Ruiqing School of Civil Engineering Shijiazhuang Tiedao University Hebei China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Hebei China School of English Studies Tianjin Foreign Studies University Tianjin China School of Traffic and Transportation Shijiazhuang Tiedao University Hebei China

To investigate the meso-mechanical behavior of heterogeneous asphalt mixtures more effectively, a discrete element method (DEM) model was developed and used to simulate uniaxial compression tests. The Weibull distribution function was introduced into the model to characterize the heterogeneity of asphalt particle contact strength, and a nonlinear damage equation derived from linear damage theory was utilized to simulate the initial damage evolution process of the asphalt mixture. The results show that: (1) After 5, 10, and 15 freeze–thaw cycles, the peak stress of the asphalt mixture decreased by 12.2%, 18.7%, and 24.9%, respectively, while the peak strain increased by 1.92%, 6.14%, and 16.1%, consistent with experimental results. (2) Both simulation and experimental damage variable evolution diagrams exhibit an ‘S’ shape, and the Weibull function effectively expresses the heterogeneous characteristics of the asphalt mixture. (3) The shape parameter m characterizes the peak stress and brittleness of the material, while the scale parameter a characterizes its deformation capacity.

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Three-dimensional train-periodic slab track-subgrade dynamics model based on the iterative solution and Green's function method

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Computers and structures 2025年 315卷

作者： Sun, Yu Zhang, Sen Xing, Mengting Shi, Zhiyong Liu, Pengfei College of Transportation Engineering Nanjing Tech University Nanjing210009 China Key Laboratory of Mechanical Behavior Evolution and Control of Traffic Engineering Structures in Hebei Shijiazhuang Tiedao University Shijiazhuang050043 China College of Rail Transit Wuxi University Wuxi214105 China Department of Industrial Engineering University of Florence Florence50139 Italy State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China

This paper develops an iterative solution model for the efficient and accurate simulation of the dynamics of a three-dimensional (3D) train-periodic slab track-subgrade (TPSTS) system. The entire system is divided into the train-rail subsystem and the periodic slab-subgrade subsystem. An ordinary differential equation (ODE) model of the train-rail system is established, and a step-moving strategy is employed to enhance the computational efficiency. A frequency-domain Green's function method (GFM) model is employed for modelling the periodic slab-subgrade. Considering the periodicity, symmetry, and attenuation characteristics of the track structure, the Green's function of the slab-subgrade structure is obtained by conducting harmonic response analysis on a finite element model (FEM) of a quarter slab-subgrade structure. The proposed model is utilized to investigate the vibration characteristics of the high-speed train-track-subgrade system. The results indicate that the model exhibits good convergence, accuracy, and efficiency. The periodicity of the track structure has a significant impact on the statistical values of subgrade displacement and stress amplitudes along the track's longitudinal direction. At the subgrade surface, the amplitudes of displacement, stress, and acceleration exhibit fluctuations in the lateral direction of the track. However, with increasing depth, these amplitudes generally attenuate, leading to a more uniform distribution. © 2025 Elsevier Ltd

关键词： Railroad transportation

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A sequoia-ecology-based metaheuristic optimisation algorithm for multi-constraint engineering design and UAV path planning

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Results in engineering 2025年 26卷

作者： Fan, Shijie Wang, Ruichen Su, Kang Song, Yang Wang, Rui State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China School of Electrical Engineering Southwest Jiaotong University Chengdu611756 China

Current metaheuristic algorithms are typically confined to inspiration from singular perspectives, isolated biological behaviours, or individual phenomena, resulting in inherent limitations that have motivated this study. Diverging from conventional approaches, this paper explores complex biological systems from an ecosystem perspective and conducts comprehensive system modelling, analysis, and algorithmic innovation. Specifically, a novel metaheuristic optimization algorithm inspired by the self-regulating and restorative phenomena observed in sequoia forest ecosystems called the Sequoia Optimization Algorithm (SequoiaOA) is proposed. The sequoia ecosystem exhibits distinctive characteristics including collective growth, resource sharing and networking, adaptability and resilience, reproduction and diversity, and elite retention. Building upon these phenomena, this work presents the first formulation of SequoiaOA, developing its mathematical model and engineering applications through algorithmic modelling and validation from the perspective of ecosystem complexity, self-regulation, and resilience in macro systems. Comparative experiments employing CEC2017 and CEC2022 benchmark functions demonstrate the algorithm's effectiveness through benchmarking against six established metaheuristic algorithms. SequoiaOA achieved superior performance in over 40 % of test functions, outperforming competitors in terms of mean values and variance of objective function measures. Furthermore, its efficacy in addressing real-world multi-constrained engineering challenges was validated through eight engineering design problems. Additional modelling and application experiments in UAV path planning underscore its practical applicability to trajectory optimization tasks. The in-depth discussions reveal that SequoiaOA possesses significant potential for future enhancements and demonstrates broad suitability for diverse optimization problems. The implementation code is available in the Appe

关键词： Biotic

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Research on the Control Technology of High Water Temperature Tunnel Grouting Water Plugging and Heat Insulation 11th

Research on the Control Technology of High Water Temperature...

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11th International Conference on Civil engineering, ICCE 2024

作者： Yang, Tengjie Tian, Baolei Xue, Yongqing Gao, Xinqiang State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China China Railway 18th Bureau Group Corporation Limited Tianjin300222 China

ISBN: (纸本)9783031879586

The surrounding rock experiences the combined impacts of elevated ground stress, high water pressure, and hot groundwater during the deep-buried tunnels with high water temperatures. The stress in the surrounding rock and groundwater flow significantly affects the temperature variations in the tunnel's construction environment. Therefore, studying heat insulation and cooling measures while constructing high-water temperature tunnels is significant. This study uses a numerical simulation method to analyze water plugging and cooling feasibility in high-water temperature tunnels through grouting measures under thermal-fluid-solid coupling conditions. The variation characteristics and laws of the tunnel's stress field, seepage field, and temperature field surrounding rock under different grouting parameters are discussed. The results show that underground hot water is significantly lost when tunnels are excavated without grouting, and the tunnel wall's cooling effect is inferior. After constructing a 5 m grouting ring, excavating the tunnel significantly affects the seepage and temperature fields within the grouting ring. The seepage flow of underground hot water in the tunnel is reduced to about 1/2942 of its original value before grouting, and the temperature of the tunnel wall is significantly reduced. Through orthogonal testing, the order of influence of different grouting parameters on the average temperature of the tunnel wall is determined as follows: grouting permeability k > grouting thickness d > solid thermal conductivity of the grouting ring λ > thermal expansion coefficient of the grouting ring β. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Thermal insulation

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Study on dynamic slaking response characteristics and calculation model of fouled ballast materials in heavy-haul railways

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Construction and Building Materials 2025年 481卷

作者： Yang, Zhihao Liu, Hengwen Deng, Xi Feng, Huaiping Chang, Jianmei Ma, Deliang Feng, Xiaoqing State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Traffic and Transportation Shijiazhuang Tiedao University Shijiazhuang050043 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China

Investigating the dynamic slaking characteristics of fouled ballast is critical for elucidating the mud pumping mechanisms in heavy-haul railway ballasted track beds. In this study, in-situ fouled ballast materials from typical mud pumping sections were collected, and a series of dynamic slaking triaxial tests were conducted. The coupled effects of loading frequency, dynamic stress amplitude, and confining pressure on deformation behavior, water infiltration patterns, and moisture migration characteristics under dynamic slaking conditions were systematically examined. Moreover, the evolutionary mechanisms of softening indices in plastically creeping specimens were quantitatively analyzed, yielding computational models for both softening indices and accumulative plastic strain. Furthermore, based on the improved Iwan series model, a calculation model of the dynamic stress-strain relationship considering the load amplitude and frequency under dynamic slaking conditions was established. The dynamic slaking deformation mechanism of fouled ballast was discussed from three aspects: the hysteresis effect of dynamic slaking deformation, the critical frequency regulation mechanism, and the hydromechanical coupling and feedback laws. Based on the findings, a "frequency-amplitude" collaborative control strategy is proposed for mitigating mud pumping diseases in ballasted track beds. © 2025 Elsevier Ltd

关键词： Ballast (railroad track)

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Reinforcing shell elements for fiber-reinforced composites undergoing large deformations and general motion

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Composite structures 2025年 366卷

作者： Li, Yanhu Lu, Yongjie Song, Jibo Zhang, Linao State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University No. 17 North 2nd Ring East Road Shijiazhuang Hebei050043 China School of Mechanical Engineering Shijiazhuang Tiedao University No. 17 North 2nd Ring East Road Shijiazhuang Hebei050043 China Department of Mechanical and Electrical Engineering Shijiazhuang College of Applied Technology No. 226 Tianning Road Shijiazhuang Hebei050043 China

Fiber-reinforced composites offer excellent mechanical properties and lightweight advantages in multibody systems. However, their significant anisotropy and geometrical and material nonlinearities present challenges for accurate modeling and simulation. In this paper, two new types of reinforcing shell elements are developed within the Absolute Nodal Coordinate Formulation framework. The first type assumes that each fiber behaves as an Euler beam with only tensile and bending stiffness, making it suitable for simulating reinforcing fibers with arbitrary orientations and nonuniform materials and cross-section areas. The second type employs elastic force formulation based on Kirchhoff–Love theory or continuum mechanics. It is suitable for simulating reinforcing fibers that appear in a layered form with unique orientation, material, and cross-section area. The fibers and matrix are described independently in these new reinforcing elements, coupled through consistent deformation compatibility conditions. This approach allows different material models and element formulations for the fibers and matrix to be used. Furthermore, multiple fibers (or layers) can be embedded within a single reinforcing shell element, providing more accurate representations of the actual physical structure. The effectiveness of the developed reinforcing elements is validated through several benchmark problems. Numerical results demonstrate that both types of reinforcing shell elements are locking-free and can automatically capture the reinforcing effects of the fibers and the coupled deformation modes. This investigation enriches the element library of the Absolute Nodal Coordinate Formulation and provides an effective tool for the accurate simulation and optimal design of fiber-reinforced composites in multibody systems. © 2025

关键词： Shells (structures)

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system Reliability Analysis for Truss structures Based on Automatic Updated Model

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Computer Modeling in engineering & Sciences 2023年第3期134卷 2057-2071页

作者： Pengyu Chen Cunbao Zhao He Yao Junliang Li State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang050043China

Multiple failure modes tend to be identified in the reliability analysis of a redundant truss *** identification process involves updating the model for identifying the next potential failure *** we intend to update the finite element model automatically in the identification process of failure modes and further perform the system reliability analysis *** study presents a framework that is implemented through the joint simulation of MATLAB and APDL and consists of three parts:reliability index of a single member,identification of dominant failure modes,and system-level reliability analysis for system reliability analysis of truss ***,RSM(response surface method)combines with a constrained optimization model to calculate the reliability indices *** theβ-unzipping method is adopted to identify the dominant failuremodes,and the system function in MATLAB,as well as the EKILL command in APDL,is used to facilitate the automatic update of the finite element model and realize ***,the differential equivalence recursion algorithmis performed to approximate the reliability indices of failuremodes efficiently and ***,the PNET(probabilistic network evaluation technique)is used to calculate the joint failure probability as well as the system reliability *** illustrative examples demonstrate the accuracy and efficiency of the proposed system reliability analysis framework through comparison with corresponding references.

关键词： Multiple failure modes truss structure automatic update system reliability analysis framework

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Fuzzy-SMC Stabilization Control Based on Vehicle-Road Recognition for Real-time and Variable Speed Conditions (October 2024)

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IEEE Access 2025年

作者： Wang, Guiyang Li, Shaohua Li, Jianchao Hebei College of Industry and Technology Shijiazhuang050091 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang050043 China

Distributed drive vehicles are able to control the output torque of each wheel independently, which can improve vehicle stability. The accuracy of road adhesion coefficient identification has a large impact on the results of yaw rate and side-slip angle estimation. A multivariate controller for real-time identification of road adhesion coefficients is designed for the Fuzzy-SMC (Fuzzy Sliding Mode Control) stability-vehicle speed coupling control of yaw stability and speed tracking of distributed drive electric vehicles. The Improved LM-MMSOFNN ( Levenberg Marquardt Multi-Module Self-Organizing Neural Networks) method is utilized to realize the road adhesion coefficient identification online, fuzzy sliding mode control is used to estimate the gain of the system to eliminate uncertainties and chattering. Hierarchical control method is adopted, the upper layer calculates the additional yaw moment with vehicle longitudinal speed tracking, and the lower layer is torque distribution layer. Considering motor characteristics and longitudinal force requirements, this control problem is transformed into a multi objective optimization problem. In variable speed working condition, compared with SMC control Fuzzy SMC control yaw rate curve is smoother, has less oscillation, the vehicle driving state is smoother. The value of side-slip angle is smaller the whole distance, and the maximum is 0.015deg. Thus it can be verified that the proposed method is adaptive to the real driving requirements. © 2013 IEEE.

关键词： Parameter estimation

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