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Experimental validation of a vertical wheel load measurement system

International Journal of Simulation: Systems, Science and Technology 2016年第12期17卷 6.1-6.4页

作者： Song, Ying Du, Yanliang Sun, Baochen School of Transportation Institute Shijiazhuang Tiedao University Shijiazhuang City050043 China Hebei Key laboratory of Structure Health Monitoring and Control Shijiazhuang Tiedao University Shijiazhuang City050043 China

A new on-track measuring method for vertical wheel/rail contact force based on PVDF strain sensors is developed, which overcomes the difficulties found in other conventional methods by resistance strain gauges. A rail model for the measurement was made and a laboratory load test using this method was performed to verify the proposed technique. Firstly, the test was performed under the condition that vertical load acts on various points along the rail direction. Secondly, the interference of bending by lateral force on rail surface strain caused by vertical force was investigated. Finally, the expected correlation between vertical wheel/rail contact force and strain responses measured by PVDF sensors was confirmed. The experimental results are perfectly compliant with the theoretical analysis and simulation calculations, which verify that the proposed method has sufficient practicability of monitoring vertical wheel load on commercial lines. © 2016, UK Simulation Society. All rights reserved.

关键词： Loads (forces)

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Full-Scale Cutting Experiments of Different Granite Integrity Using Tunnel Boring Machine Disc Cutter

SSRN

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SSRN 2022年

作者： Sun, Hao-Kai Gao, Yang Chen, Yong Geotechnical and Structural Engineering Research Center Shandong University Jinan250061 China Key Laboratory for Structure Health Monitoring and Control in Hebei Province Shijiazhuang Tiedao University Shijiazhuang050043 China

The complex geological conditions of tunnels with tunnel boring machine make geological exploration very difficult. To explore the method of predicting the rock mass integrity based on the cutterhead vibration signal, the mapping relationship between the rock mass integrity, cutter forces, and cutterhead vibration was studied by the full-scale rotary cutting machine. Our finding is that the mean amplitude, the single peak value of the normal force, and the RMS values of the cutterhead vibration all increase with ascending rock mass integrity. The average amplitude and single peak value decrease, and the RMS value increase with the increase of the rotation speed. The average amplitude increases, the single peak value decreases, and the RMS value increases as the advance speed increase. We demonstrated that there is an obvious corresponding relationship between the normal force and the vibration, and rock mass and operating parameters have significant effects on the vibration characteristics. © 2022, The Authors. All rights reserved.

关键词： Boring machines (machine tools)

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A Novel Rough-Surface Direct Wave Suppression Algorithm b ased on Energy Adaptive Analysis

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Journal of Engineering Science and Technology Review 2016年第4期9卷 202-208页

作者： Yong, Yang Weigang, Zhao Yanliang, Du Hao, Zhang School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing100044 China The Key Laboratory for Health Monitoring and Control of Large Structures in Hebei Province Shijiazhuang Tiedao University Shijiazhuang050043 China Department of Urban & Civil Engineering Ibaraki University Hitachi 316-8511 Japan

As a nondestructive testing technology, ground penetrating radar (GPR) is widely used in the detection and recognition of high-speed railway subgrade diseases. Rough-surface direct wave suppression caused by locomotive vibration and subgrade irregularity is a challenge in the GPR signal process. Flat-surface assumption makes traditional method difficult to apply directly to the rough terrain environment. To remove rough-surface direct wave and improve the signal-to-noise ratio, a new adaptive algorithm is proposed in this paper. First, according to the characteristic of electromagnetic wave propagation, the echo model of GPR was constructed, and the composition of ground radar echo signal was analyzed. Next, the eigenvalue and eigenvector of the echo signal and ground direct wave were studied. With the increase of relative permittivity, the energy eigenvector of direct wave and echo signal converged to the same vector space. On this basis, a rough-surface direct wave suppression framework based on energy feature adaptive analysis was proposed. Finally, a numerical simulation and field experiment were carried out to verify the feasibility of the algorithm. Results showed that the algorithm effectively suppresses the rough ground direct wave, and the processing result preserves the target echo more completely. Without intervention, this method can be applied in automatic direct wave suppression, which will promote the development of automatic identification technology in the detection of railway subgrade diseases. © 2016. Eastern Macedonia and Thrace Institute of Technology. All rights reserved.

关键词： Vector spaces

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Experimental and Probabilistic Study of Fatigue Crack Growth Behavior of Steel Q345qc Under Different Stress Ratios

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SSRN 2023年

作者： Ke, Lu Li, Youlin Li, Chuanxi Feng, Zheng Zhu, Furui Liang, Longming Mei, Shuyu Key Laboratory of Disaster Prevention and Structural Safety of China Ministry of Education School of Civil Engineering and Architecture Guangxi University Guangxi Nanning530004 China Key Laboratory of Large Structure Health Monitoring and Control Shijiazhuang050043 China Department of Architectural Engineering Hanyang University 222 Wangsimni-ro Seongdonggu Seoul04763 Korea Republic of Changsha University of Science and Technology China

The stress ratio effects and the scatter of the fatigue test results are the key issues in the design of steel fatigue performance. This paper reports an experimental and probabilistic investigation of the fatigue crack growth (FCG) behavior of steel Q345qC. Firstly, the microstructural characteristics and mechanical properties of steel Q345qC were examined via an optical microscope and tensile tests. Next, the FCG behavior of steel Q345qC was investigated under different stress ratios. The fatigue crack growth rate (FCGR) equations incorporating survival probabilities were proposed based on Paris and Walker laws. Finally, the theoretical FCG life under different survival probabilities in the crack stable growth region is calculated based on the integral formulas of Paris and Walker equations and compared with the tested FCG life. The experimental results demonstrate that the larger the stress ratio, the smaller the length of stress intensity factor (SIF) amplitude experienced in the stable growth region and the smaller the SIF at the end of this region. Both Paris and Walker equations can be used for FCGR calculations when the survival probability is set as 50% and the error between them and the tested values is smaller. The FCG life is calculated using the integral formula based on the Walker law with a high safety tolerance and a wide application interval of stress ratio when the survival probability is set as 90%. © 2023, The Authors. All rights reserved.

关键词： Fatigue crack propagation

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Effect of different TiCl4 processing on mesoporous TiO2/CH3NH3PbI3 Heterojuction Solar Cells

Effect of different TiCl4 processing on mesoporous TiO2/CH3N...

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第十四届中国光伏大会暨2014中国国际光伏展览会

作者： Jinjin Zhao Peng Wang Zhenghao Liu Liyu Wei Chong Liu Xing Zhang Ying Xu Jiandong Fan Yaohua Mai The Key Laboratory for Health Monitoring and Control of Large Structures Shijiazhuang 050043 School School of Materials Science and Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043 College Physics Science and technology HeBei UniversityBaoding City 071002

Very recently,organic–inorganic lead halide based perovskites (CH3NH3PbX3(X:Cl,Br,or I)) have emerged as a new class of light absorbers for thin film solar cells.[1] A PCE exceeding 15% was realized recently with two... 详细信息

关键词： perovskite solar cell TiCl4 processing two-step deposition mesoporous pore filling ratio

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Erratum to: Analytical Solutions of Cracks Emanating from an Elliptic Hole in an Infinite Plate under Tension (Chinese Journal of Mechanical Engineering, (2014), 27, 5, (1057-1063), 10.3901/CJME.2014.0526.300)

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Chinese Journal of Mechanical Engineering (English Edition) 2019年 1-1页

作者： Liu, Shuhong Duan, Shijie Department of Engineering Mechanics Shijiazhuang Tiedao University Shijiazhuang050043 China The Key Laboratory for Health Monitoring and Control of Large Structures of Hebei Province Shijiazhuang050043 China Department of Adult Education Shijiazhuang Tiedao University Shijiazhuang050043 China

The original version of this article unfortunately contained a mistake. The presentation of the DOI in printed version was incorrect. The corrected DOI is given below. DOI: 10.3901/CJME.2014.0526.300. © 2014, Chi...

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structure Crack monitoring Based on Long-gauge FBG Sensor

Structure Crack Monitoring Based on Long-gauge FBG Sensor

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The 2nd International Conference on Structural health monitoring and Integrity Management(第二届国际结构健康监测与完整性管理会议)

作者： ZHANG Wen-tao BIAN Ce HUANG Lin XU Hong-bin DU Yan-liang LI Fang Optoelectronic System Laboratory Institute of SemiconductorsChinese Academy of SciencesBeijingChina Key Lab.of Structure Health Monitoring and Control of Hebei ProvinceShijiazhuang Tiedao UniversityShijiazhuangChina Graduate School of Shijiazhuang Tiedao UniversityShijiazhuangChina

Crack detection is very important for long-term large-scale structural health monitoring(SHM).Fiber optic sensor has been approved to have good performance in application in *** this paper,we present a novel method to monitoring the crack by using long-gauge FBG sensor.A FBG with a gauge length of 50 mm is *** the crack pass through the FBG,the reflect spectrum of FBG will be expanded or *** position of the crack will result in different Shape of the *** analyzing the characteristics of the spectrum,the position of the crack can be detected and the opening width of the crack can be estimated.

关键词： Fiber Bragg Grating crack detection sensitivity resolution

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Ice Gathering Feature in the Soil Freezing Process and its Influence on Soil Local Deformation

SSRN

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SSRN 2023年

作者： Wang, Meng Li, Xu Du, Yan-Liang Zhang, Yu-Zhi Chen, Jian-Bing Xu, Fei Gao, Yang Dong, Zhang School of Safety Engineering and Emergency Management Key Laboratory of Large Structure Health Monitoring and Control Shijiazhuang Tiedao University Shijiazhuang050043 China Key Laboratory of Urban Underground Engineering of Ministry of Education Beijing Jiaotong University Beijing100044 China Qinghai Research and Observation Base Key Laboratory of Highway Construction & Maintenance Technology in Permafrost Regions Ministry of Transport Qinghai Xining810001 China CCCC First Highway Survey and Design Research Institute Co. Ltd National Key Laboratory for Road Engineering Safety and Health in High-Cold and High-Altitude Regions Key Laboratory for Highway Construction and Maintenance Technology in Permafrost Regions

The variation in frozen soil’s ice content is the main cause of engineering diseases in cold regions. However, currently, there is a lack of experimental data on the coupling of frozen local temperature, ice content, and local deformation. This paper focused on the frost heave process in unsaturated soil and utilized a self-developed multi-field coupled frost heave test device. In the soil column frost heave test, the temporal and spatial variations of local temperature, pore volume ice content, and local strain were synchronously collected, and the decoupling of multi-source data in a single test was realized. Based on the test data, the following conclusions were drawn: 1. In unsaturated silty clay, a critical frost segregation temperature exists. When the local temperature is between the freezing point and the critical temperature, both the deformation and ice content of the soil continue to increase. For non-bottom frost segregation cracks that meet this condition, their width can also increase continuously and slowly. When the local temperature falls below the critical frost segregation temperature, the rate of local deformation and ice content variation gradually slows down. 2. The critical temperature can be approximated from the turning point of the soil’s SFCC. 3. Segregation cracks in unsaturated frozen soil can form partially frozen cracks with a maximum ice saturation of less than 60%. The mechanism behind their formation may be related to water film thickness and freezing rate. The findings of this study contribute to the improvement of the theoretical framework of frozen soil mechanics. © 2023, The Authors. All rights reserved.

关键词： Frozen soils

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Comprehensive Verification and Analysis of Multi-Scale Remote Sensing Products for Surface Freezing- Thawing Status on the Qinghai-Tibet Plateau

Comprehensive Verification and Analysis of Multi-Scale Remot...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Xiaokang Kou Zhaoyang Jia Shuang Yan Mengjie Jin Yuzhi Zhang Tianliang Wang Key Laboratory of Roads and Railway Engineering Safety Control (Shijiazhuang Tiedao University) Ministry of Education Shijiazhuang Hebei China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang Hebei China Institute of Geographical Sciences Hebei Academy of Sciences Hebei Engineering Research Center for Geographic Information Application Shijiazhuang Hebei China Key Laboratory for Health Monitoring and Control of Large Structures in Hebei Province Shijiazhuang Tiedao University Shijiazhuang Hebei China

ISBN: (数字)9781728163741

ISBN: (纸本)9781728163758

The surface soil freezing and thawing (F/T) status plays important roles in water and energy exchanges, hydrology cycle and terrestrial ecosystem. Passive microwave remote sensing tends to be one of the most effective ways of monitoring global surface F/T status, due to its strong sensitivity to the changes of liquid water and its short revisiting period. Many surface F/T products have been produced based on the observations from different passive microwave sensors. However, due to the differences in spatial scales, satellite data sources, transit times etc., the accuracy and the consistency of different F/T products need to be well considered in front of the comprehensive utilization. In this study, the surface F/T products with resolutions of 36 km, 25 km, 25 km and 6 km derived from SMAP, SSMIS, AMSR-2, AMSR-2 (downscaling) were validated separately based on the in-situ observations in Ngari prefecture and Maqu on the Qinghai-Tibet Plateau. Then a comparison analysis was conducted on the F/T products derived from SMAP and SSMIS to figure out the consistency between F/T products derived from different sensors. The results show that: 1) the verification accuracy in Maqu is higher than that in Ngari prefecture, which reflects the limited capability of passive microwave in identifying the soil surface F/T status in the arid region. 2) The F/T products with resolutions of 6 km and 25 km, which were both derived from AMSR-2 and have the same transit time, showed similar validation accuracies. 3) There is a good agreement between the F/T products derived from SMAP and that from SSMIS. This study will be conducive to the comprehensive application of multi-scale F/T products in the fields of climate change and ecological environment.

关键词： Microwave radiometry Microwave theory and techniques Satellite broadcasting Land surface Spatial resolution Microwave imaging Orbits

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Main structure Design and Constructional Safety control of large-span Gravel Surrounding-Rock Tunnel

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IOP Conference Series: Materials Science and Engineering 2020年第6期780卷

作者： Li De-kang Li Hao-ran OuYang Zuo-lin Yue Zhi-guo Dong Yan-dong Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang Hebei 050043 China The Key Laboratory for Health Monitoring and Control of Large Structures Shijiazhuang Tiedao University Shijiazhuang Hebei 050043 China Shuohuang Railway Development Limited Liability Company Yuanping Shanxi 034100 China

As the construction of large-span gravel surrounding-rock tunnel is very difficult which has serious security risks, it is significant to choose a set of reasonable structure design methods and safety control schemes. This paper taked a large-span gravel road tunnel in Jinan Expressway as an example. Through combining theoretical analysis with numerical simulation, the main structure design process of the large-span IV level surrounding-rock tunnel was divided into four steps, meanwhile concrete measure basis and testing methods were given. According to the engineering geological conditions and the structure design schemes, the construction schemes and monitoring measurement projects of large-span gravel surrounding-rock tunnel were determined to ensure the safety of tunnel construction. This paper provides a complete example scheme for the design and construction of the main structure of the large-span IV class surrounding-rock tunnel, which provides a reference for similar projects in the future.

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