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2nd International Conference on Materials Engineering and Automatic control, ICMEAC 2013

作者： Huang, Wen Zhu Zhang, Wen Tao Ma, Huai Xiang Li, Fang Du, Yan Liang School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang China Optoelectronic System Laboratory Institute of Semiconductors Chinese Academy of Sciences Beijing China Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Tiedao University Shijiazhuang China

ISBN: (纸本)9783037857250

This study aims at providing a practical method in large structure health monitoring. A novel fiber optic rosette based on distributed feedback (DFB) fiber laser for acoustic emission (AE) detection and location is presented. The ultra-narrow line width of the DFB fiber laser will result in high resolution in AE wave detection using a fiber optic interferometric demodulation method. The directivity of the fiber optic rosette is investigated. A rosette with three DFB fiber lasers is tested in the experiment to determine the direction of propagation of AE waves. © (2013) Trans Tech Publications, Switzerland.

关键词： Fiber lasers

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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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Mechanical and Failure Characteristics of Shear keys on Immersed Tunnel Segment Joints under Differential Settlements

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Procedia Engineering 2016年 166卷 373-378页

作者： Zhi-nan Hu Yong-li Xie School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang 050043 China The Key Laboratory for Health Monitoring and Control of Large Structures Shijiazhuang 050043 China College of Highway Chang’an University Xi’an 710064 China

In order to research mechanical and failure characteristics of shear keys on immersed tunnel segment joints, a 1:4.69 large scale immersed tunnel physical model test was conducted on a settlement platform. Bending and twisting working conditions of segment joints caused by uneven settlements and uneven back-silting were simulated, by means of controlling the lifting jacks under the settlement platform. Simultaneously, a 3-D numerical simulation which considered the nonlinearity of rubber pads and contacting effects between segment joints was carried out. The results shows that vertical shear keys have main contribution to resist expansion of segment joints in bending condition, and vertical shear keys on the soft layer have larger shear forces than that on the hard layer. In addition, shear stresses were mainly concentrated at the terminal corners and connecting corners between shear keys and segments. Correspondingly, at the terminal corners and connecting corners between shear key and segments appeared 30° ∼60° and 45° extending cracks respectively. At last, some structural strengthen suggestions on shear keys were offered for immersed tunnel design.

关键词： Immersed tunnel Segment joints Shear keys Failure characteristics Differential settlements

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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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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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Evolution Law of Frost-Heaving Pressure of Frozen Circles in Surrounding Rock around Water-Rich Tunnels in Cold Regions

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Zhongguo Gonglu Xuebao/China Journal of Highway and Transport 2022年第9期35卷 340-351页

作者： Zheng, Xin-Yu Xu, Fei Sun, Hao-Kai Gao, Yang Wei, Li-Yuan Geotechnical and Structural Engineering Research Center Shandong University Shandong Jinan250061 China Key Laboratory of Large Structure Health Monitoring and Control Shijiazhuang Tiedao University Hebei Shijiazhuang050043 China State Key Laboratory for Geomechanics & Deep Underground Engineering China University of Mining and Technology Jiangsu Xuzhou221116 China School of Civil Engineering Southwest Jiaotong University Sichuan Chengdu610031 China

The frost-heaving evolution mechanism of frozen circles in surrounding rock around water-rich tunnel is a key scientific problem that affects the operation safety in cold regions. To explore the evolution law of frost-heaving pressure in frozen circles in such surrounding rock, scaled three-dimensional geomechanical model tests were carried out. In these tests, freezing of a water-bearing surrounding rock at low temperature was considered. The temperature field distribution characteristics of surrounding rock at the tunnel portal section was simulated by introducing ambient air into the tunnel for cooling. Micro-pressure sensors were employed to dynamically monitor the frost-heaving pressure in real time. The spatial and temporal evolution curves of the frost-heaving pressure were obtained for various water content and thickness in surrounding rock. The fitting formulas for parameters such as the frost-heaving rate of surrounding rock, thickness of the frozen circles, and water content were established utilizing multiple regression analysis. Based on this, a theoretical solution for the frost-heaving pressure of the frozen circles in surrounding rock under plain strain state was derived considering the influence of water content and proportion index of surrounding rock. The thermal stress method was used to simulate the evolution characteristics of frost-heaving pressure. Combined with numerical simulations, the test method and theoretical solution were further verified by comparing the predicted frost-heaving pressure with the theoretical and test values. The results indicate that the temperature field of surrounding rock undergoes changes in three stages. This is similar to a regular spoon with a handle-like evolution process;the temperature field of the water-bearing surrounding rock exhibits a non-linear distribution in the descending stage;the temperature field of surrounding rock shows a lagging characteristic relative to the environmental temperature. The sha

关键词： Temperature

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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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Study on the Band Gap and Directional Wave Propagation Mechanism of Novel Single-Phase Metamaterials

SSRN

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SSRN 2022年

作者： Cheng, Shu-Liang Yang, Hong-Yun Yan, Qun Wang, Bin Sun, Yong-Tao Xin, Ya-Jun Ding, Qian Yan, Hao Wang, Liang Key Laboratory of Mechanical Reliability for Heavy Equipment and Large Structure of Hebei Province Yanshan University Qinhuangdao China Tianjin Key Laboratory of Soft Soils and Engineering Environment Tianjin Chengjian University Tianjin China Department of Mechanics Tianjin Key Laboratory of Nonlinear Dynamics and Control Tianjin University Tianjin China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang China Key Laboratory of Aeroacoustics and Dynamics Aircraft Strength Research Institute Xi’an China Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province Yanshan University Qinhuangdao China

In this paper, a new type of single-phase metamaterial is proposed. Based on the finite element method, the band gap characteristics of the structures with different branches are comprehensively analyzed, and the existence of the band gap is further verified by the frequency response transmission spectrum. Then, the propagation characteristics of elastic waves of different frequencies in different combinations of structures are investigated respectively. The results show that the proposed single-phase metamaterial structure has an excellent band gap range, and under the action of relatively low-frequency elastic waves, the wave propagation in the structure has a certain direction and regionality, while the elastic waves at higher frequencies are applied, the propagation direction of the wave tends to propagate in all directions. This paper provides a new idea for studying the structural design of metamaterials with specific wave propagation directions. © 2022, The Authors. All rights reserved.

关键词： Energy gap

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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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