检索结果-内蒙古大学图书馆

Development and application of tail brush elastic test device

Scientific Reports 2025年第1期15卷 1-24页

作者： Li, Jingkai Guo, Jingbo Yang, Shaopu Han, Mengze Li, Jie Zhang, Ziyue Ren, Zifeng Ge, Jun Liu, Jinbo Department of Mechanical Traffic and Transportation Shijiazhuang Tiedao University Hebei Shijiazhuang 050043 China Department of Mechanical Engineering Shijiazhuang Tiedao University Hebei Shijiazhuang 050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Hebei Shijiazhuang 050043 China

The shield tail brush loss elasticity is the key reason for the failure of shield tail seal. However, due to the limitation of test equipment, there is little research on the elastic properties of tail brush. In this research, a tail brush elastic test device was developed. Through this device, the tail brush is tested for elasticity. In this test, the grease filling layer number, tail brush mass, tail clearance, pressing number and pressing time were taken as the influencing factors, and the elastic coefficient and resilience force were taken as the response values. Single-factor test was carried out for each factor, then based on the Plackett-Burmanf theory and Box-Behnken response surface design theory, the ANOVA method was used to find out the significant degree of each factor’s influence on the quantitative index. The prediction model of elastic coefficient and resilience force was fitted based on RSM theory, and the verification group was added to verify the reliability of the prediction model. The results showed that the significance of influencing factors on the elasticity coefficient was ranked as follows: tail clearance > pressing number > pressing time > grease filling layer number. The significance of influencing factors on brush resilience F was ranked as follows: tailclearance > grease filling layer number > pressing time > pressing number. The accuracy of elastic coefficient regression model is 94.1%. The accuracy of the resilience force regression model is 99.56%, and the accuracy of the prediction model is high, which can be used to predict the elasticity coefficient and resilience force. Finally, the elastoplastic development mechanism of tail brush is discussed, and the safety standard of tail brush is proposed, which provides a basis for the selection of tail brush in practical construction. © The Author(s) 2025.

关键词： Box-Behnken test Elastic coefficient Plackett-Burman test Resilience force Shield tail sealing system Tail brush

来源：评论

学校读者我要写书评

暂无评论

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...

引用

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 Shijiazhuang 050043 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang 050043 China China Railway 18th Bureau Group Corporation Limited Tianjin 300222 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： Grouting Prevention and control High Water Temperature Tunnel Numerical Simulation Orthogonal Test Thermal-Fluid-Solid coupling

来源：评论

学校读者我要写书评

暂无评论

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

引用

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)

来源：评论

学校读者我要写书评

暂无评论

Research on dynamic characteristics of electromagnetic SD oscillator system under state feedback control

引用

International Journal of Non-Linear Mechanics 2025年 176卷

作者： Wang, Meiqi Zu, Qian Wang, Ruichen Qin, chengwei Liu, Pengfei School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China Hebei Key Laboratory of Mechanical Power and Transmission Control Shijiazhuang Tiedao University Shijiazhuang050043 China CRRC Tangshan Co. Ltd Tangshan064000 China

To enhance the robustness of the smooth and discontinuous (SD) oscillator system, an electromagnet incorporating displacement-velocity state feedback control is integrated above the oscillator. The electromagnetic interaction between the electromagnet and the oscillator facilitates accelerated system stabilization. This study investigates a novel electromagnetic SD oscillator. Initially, the steady-state amplitude-frequency and phase-frequency response characteristics are derived using the averaging method, with an analysis of how each state feedback parameter influences the amplitude-frequency curve. Utilizing Lyapunov stability theory and the Routh criterion, the stability conditions for the system's periodic solutions are established. Subsequently, the Melnikov theorem is employed to determine the necessary conditions for the onset of chaos within the system. Dynamic bifurcation analysis, maximum Lyapunov exponent (LLE) curves, and system behaviors under various parameters are examined to assess the impact of state feedback parameters on the chaotic boundary curve. On this basis, the global bifurcation characteristics of different parameters of the system are studied by using the cell mapping method, and the influence of each parameter on the number of attractors and the domain of attraction is analyzed. Finally, the displacement transmissibility is used to evaluate the vibration isolation effect of the system. The findings indicate that the electromagnetic SD oscillator exhibits superior vibration reduction capabilities, effectively mitigating chaos and bifurcation phenomena. Optimal selection of state feedback parameters enables rapid system stabilization under external excitation conditions. © 2025 Elsevier Ltd

关键词： state feedback

来源：评论

学校读者我要写书评

暂无评论

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

引用

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)

来源：评论

学校读者我要写书评

暂无评论

Design and vibration reduction performance analysis of a 6-DOF nonlinear vibration isolation platform by employing bio-inspired multi-joint X-structure

引用

Nonlinear Dynamics 2025年

作者： Jiang, Guoqing Zang, Haoxiang Xiong, Yuanhao Shen, Yongjun Guo, Zhenkun Yang, Yang Li, Meng School of Mechanical Engineering Zhejiang Sci-Tech University Hangzhou 310018 China School of Civil Engineering & Transportation Beihua University Jilin 132013 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang 050043 China Beijing Engineering Research Center of Monitoring for Construction Safety Beijing University of Civil Engineering and Architecture Beijing 100044 China School of Mechanics and Aerospace Engineering Southwest Jiaotong University Chengdu 610031 China

A novel six-degree-of-freedom (6-DOF) passive vibration isolation platform is studied, which consists of six nonlinear bionic multi-joint isolation structures, top and base platforms. It achieves excellent and adjustable vibration isolation performance in all six directions. By using the multi-rigid system analysis method, the static equilibrium equation and dynamic equation of the 6-DOF isolation platform are established. Vibration isolation performance in six directions (three translational and three rotational) is analyzed, with transmissibility as the indicator. The results show that: (a) By appropriately adjusting structural parameters based on their impact on the platform’s nonlinear stiffness characteristics, the vibration isolation performance in one direction can be optimized (with the minimum isolation frequency reaching as low as 1.1 Hz) without compromising the platform’s loading capacity;(b) By symmetrically arranging the multi-joint structures between layers, the novel vibration isolation platform can demonstrate superior high static and low dynamic stiffness (HSLDS) property and thus excellent vibration isolation performance;(c) The designed isolation platform exhibits low dynamic stiffness even when positioned far from the vibration equilibrium point, enabling low-frequency isolation performance under large displacement vibrations;(d) The platform exhibits directional differences in vibration isolation performance, with better isolation observed in the P_x and P_y directions compared to P_z, and in the P_α and P_β directions compared to P_γ. © The Author(s), under exclusive licence to Springer Nature B.V. 2025.

关键词： Bio-inspired structure Nonlinear vibration isolation Six directions vibration isolation Stewart platform

来源：评论

学校读者我要写书评

暂无评论

system Reliability Analysis for Truss structures Based on Automatic Updated Model

引用

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

来源：评论

学校读者我要写书评

暂无评论

Fuzzy-SMc Stabilization control Based on Vehicle-Road Recognition for Real-time and Variable Speed conditions (October 2024)

引用

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

来源：评论

学校读者我要写书评

暂无评论

On the Polygonal Wear Evolution of Heavy-Haul Locomotive Wheels due to Wheel/Rail Flexibility and Its Mitigation Measures

引用

chinese Journal of mechanical engineering 2024年第1期37卷 40-61页

作者： Yunfan Yang Feifan chai Pengfei Liu Liang Ling Kaiyun Wang Wanming Zhai State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengdu 610031China

Wheel polygonal wear can immensely worsen wheel/rail interactions and vibration performances of the train and track,and ultimately,lead to the shortening of service life of railway *** present,wheel/rail medium-or high-frequency frictional interactions are perceived as an essential reason of the high-order polygonal wear of railway wheels,which are potentially resulted by the flexible deformations of the train/track system or other external *** this work,the effect of wheel/rail flexibility on polygonal wear evolution of heavy-haul locomotive wheels is explored with aid of the long-term wheel polygonal wear evolution simulations,in which different flexible modeling of the heavy-haul wheel/rail coupled system is ***,the mitigation measures for the polygonal wear of heavy-haul locomotive wheels are *** results point out that the evolution of polygonal wear of heavy-haul locomotive wheels can be veritably simulated with consideration of the flexible effect of both wheelset and *** of mixed-line operation of heavy-haul trains and application of multicut wheel re-profiling can effectively reduce the development of wheel polygonal *** research can provide a deep-going understanding of polygonal wear evolution mechanism of heavy-haul locomotive wheels and its mitigation measures.

关键词： Heavy-haul locomotive Wheel polygonal wear Wheel/rail flexibility Long-term polygonal wear evolution Mitigation measures

来源：评论

学校读者我要写书评

暂无评论

Subharmonic resonance of single-degree-of-freedom piecewise-smooth nonlinear oscillator

引用

Acta Mechanica Sinica 2020年第5期36卷 1109-1118,I0003页

作者： Jiangchuan Niu Wenjing Zhang Yongjun Shen Shaopu Yang State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China

Take the single degree of freedom nonlinear oscillator with clearance under harmonic excitation as an example,the 1/3 subharmonic resonance of piecewise-smooth nonlinear oscillator is *** approximate analytical solution of 1/3 subharmonic resonance of the single-degree-of-freedom piecewise-smooth nonlinear oscillator is *** changing the solving process of Krylov-Bogoliubov-Mitropolsky(KBM)asymptotic method for subharmonic resonance of smooth nonlinear system,the classical KBM method is extended to piecewise-smooth nonlinear *** existence conditions of 1/3 subharmonic resonance steady-state solution are achieved,and the stability of the subharmonic resonance steady-statesolution is also *** is found that the clearance affects the amplitude-frequency response of subharmonic resonance in the form of equivalent negative *** a demonstration example,the accuracy of approximate analytical solution is verified by numerical solution,and they have good *** on the approximate analytical solution,the infuences of clearance on the critical frequency and amplitude-frequency response of 1/3 subharmonic resonance are analyzed in *** analysis results show that the KBM method is an effective analytical method for solving the subharmonic resonance of piecewise-smooth nonlinear *** it provides an effective reference for the study of subharmonicr esonance of other piecewise-smooth systems.

关键词： Subharmonic resonance Piecewise-smooth system Approximate analytical solution Asymptotic method

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：