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Ultrahigh-speed distributed Brillouin reflectometry

Light(Science & Applications) 2016年第1期5卷 349-356页

作者： Yosuke Mizuno Neisei Hayashi Hideyuki Fukuda Kwang Yong Song Kentaro Nakamura Institute of Innovative Research Tokyo Institute of TechnologyMidori-kuYokohama 226-8503Japan Research Center for Advanced Science and Technology The University of TokyoMeguro-kuTokyo 153-8904Japan Servo Laboratory FANUC CorporationOshino-muraYamanashi 401-0597Japan Department of Physics Chung-Ang UniversityDongjak-guSeoul 06974Korea

Optical fibre sensors based on Brillouin scattering have been vigorously studied in the context of structural health monitoring on account of their capacity for distributed strain and temperature ***,real-time distributed strain measurement has been achieved only for two-end-access systems;such systems reduce the degree of freedom in embedding the sensors into structures,and furthermore render the measurement no longer feasible when extremely high loss or breakage occurs at a point along the sensing ***,we demonstrate real-time distributed measurement with an intrinsically one-end-access reflectometry configuration by using a correlation-domain *** this method,the Brillouin gain spectrum is obtained at high speed using a voltage-controlled oscillator,and the Brillouin frequency shift is converted into a phase delay of a synchronous sinusoidal waveform;the phase delay is subsequently converted into a voltage,which can be directly *** a single-point measurement is performed at an arbitrary position,a strain sampling rate of up to 100 kHz is experimentally verified by detecting locally applied dynamic strain at 1 *** distributed measurements are performed at 100 points with 10 times averaging,a repetition rate of 100 Hz is verified by tracking a mechanical wave propagating along the *** drawbacks of this ultrahigh-speed configuration,including the reduced measurement accuracy,lowered spatial resolution and limited strain dynamic range,are also discussed.

关键词： Brillouin scattering distributed strain and temperature sensing high-speed measurement nonlinear optics optical fibre sensors

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Influence of the Moho surface distribution on the oil and gas basins in China seas and adjacent areas

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Acta Oceanologica Sinica 2023年第3期42卷 167-188页

作者： Yimi Zhang Wanyin Wang Linzhi Li Xingang Luo Dingding Wang Tao He Feifei Zhang Jing Ma Institute of Gravity and Magnetic Technology School of Geology Engineering and GeomaticsKey Laboratory of Western China’s Mineral Resources and Geological Engineering of Ministry of EducationChang’an UniversityXi’an 710054China China National Offshore Oil corporation(CNOOC)Research Institute Co. Ltd.Beijing 100028China National Engineering Research Center of Offshore Oil and Gas Exploration Beijing 100028China Key Laboratory of Marine Geology and Environment Chinese Academy of SciencesQingdao 266071China Department of Earth Sciences Memorial University of NewfoundlandSt.John’sNewfoundland AlB3X5Canada Qingdao Institute of Marine Geology China Geological SurveyQingdao 266071China

Owing to the strategic significance of national oil and gas resources,their exploration and production must be prioritized in *** and gas resources are closely related to deep crustal structures,and Moho characteristics influence oil and gas ***,it is important to study the relationship between the variation of the Moho surface depth undulation and hydrocarbon basins for the future prediction of their *** Moho depth in the study area can be inverted using the Moho depth control information,the Moho gravity anomaly,and the variable density distribution calculated by the infinite *** on these results,the influences of Moho characteristics on petroleum basins were *** found that the Moho surface depth undulation deviation and crustal thickness undulation deviation in the hydrocarbon-rich basins are large,and the horizontal gradient deviation of the Moho surface shows a positive linear relationship with oil and gas resources in the *** oil-bearing mechanism of the Moho basin is further discussed *** Moho uplift area and the slope zone correspond to the distribution of oil and gas *** tensile stress produced by the Moho uplift can form tensile fractures or cause tensile fractures on the surface,further developing into a fault or depression basin that receives *** organic matter can become oil and natural gas under suitable chemical and structural *** the action of groundwater or other dynamic forces,oil and natural gas are gradually transported to the uplift or the buried hill in the depression zone,and oil and gas fields are formed under the condition of good *** research results can provide new insights into the relationship between deep structures and oil and gas basins as well as assist in the strategic planning of oil and gas exploration activities.

关键词： China Seas and adjacent areas Moho surface oil and gas basins

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Large Telescope Wind Load Estimation with Gradient Segments Superposition and its Servo Control

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天文和天体物理学研究:英文版 2023年第9期23卷 79-90页

作者： Jia-Heng Yu Song Xue Tian Luan Long-Yang Wang Pei-Yuan Lian Yue-Fei Yan De-Qing Kong Wu-Lin Zhao Qian Xu Cong-Si Wang School of Mechano-Electronic Engineering Xidian UniversityXi’an 710071China Guangzhou Institute of Technology Xidian UniversityGuangzhou 510555China University of Chinese Academy of Sciences Beijing 100049China The 39th Research Institute of China Electronics Technology Group corporation Xi’an 710065China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China

Obtaining the wind load distribution on the telescope aperture is very important to estimate its influence and reduce the wind disturbance on the telescope *** aperture of the radio telescope structure can be as large as 100 m and therefore,the uniform wind load on the aperture assumption is not suitable for the radio telescope with large *** this paper,a gradient segments superposition method for calculating the wind load has been *** proposed method has been constructed by combining two regional ***,reflecting surface has been evenly divided in the altitudinal ***,the reflecting surface has been divided into several uniform rings assuming that the wind load coefficient on different rings are *** the 110 m aperture radio telescope,the wind load estimation results differ by 28%.After that,a structural dynamics model of telescope has been established and a fuzzy PID controller has been designed to reduce wind *** Root Mean Square Error of telescope pointing under wind disturbance has been reduced by 67.8%.It is suggested that the proposed wind load estimation method has lay a solid foundation for the design of the large telescope system under wind disturbance.

关键词： methods analytical-methods data analysis-methods numerical-telescopes

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structural Optimization Using Biological Variables to Understand How Bones Design Holes

Structural Optimization Using Biological Variables to Unders...

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The Fourth World Congress of structural and Multidisciplinary Optimization

作者： Satchi Venkataraman Raphael T.Haftka Andrew J.Rapoff AeroChem corporation Box 90087 Gainesville FL 32607 University of Florida Department of Aerospace Engineering Mechanics and Engineering Science Box 116250 Gainesville FL 32611-6250 USA University of Florida Department of Aerospace Engineering Mechanics and Engineering Science Box 116250 Gainesville FL 32611-6250 USA

＜正＞Bones do not normally fracture near blood vessel holes. This in part may be related to profiles of porosity, mineralization, and histologic architecture （defined later） near the holes, as these parameters are known to affect bone stiffness and strength. This paper optimizes these material parameters in a simple model of a cross section of the bone in an attempt to duplicate the observed material variation. The objective function is the failure index （loosely, stress-strength ratio） under uniaxial loads. The optimum distributions were similar to those previously observed by us （Gotzen et al. 2001）, but the reduction in the failure index was not sufficient to prevent failure at the hole. This may indicate that the limitations imposed on variations in material property distribution were too constraining, or that data used for the material model was not accurate enough.

关键词： Stress concentration bone plate with hole functionally graded materials optimization.

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Multiscale strain alleviation of Ni-rich cathode guided by in situ environmental transmission electron microscopy during the solid-state synthesis

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Journal of Energy Chemistry 2023年第9期84卷 467-475页

作者： Fengyu Zhang Yunna Guo Chenxi Li Tiening Tan Xuedong Zhang Jun Zhao Ping Qiu Hongbing Zhang Zhaoyu Rong Dingding Zhu Lei Deng Zhangran Ye Zhixuan Yu Peng Jia Xiang Liu Jianyu Huang Liqiang Zhang School of New Energy and Materials China University of Petroleum BeijingBeijing 102249China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004HebeiChina School of Materials Science and Engineering Beihang UniversityBeijing 100191China Sichuan New Energy Vehicle Innovation Center Yibin 644000SichuanChina School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105HunanChina Peking University Institute of Advanced Agricultural Sciences Shandong Laboratory of Advanced Agricultural Sciences at WeifangWeifang 261000ShandongChina China Oil&Gas Pipeline Network corporation Department of Engineering Beijing 100026China Hebei Key Laboratory of Applied Chemistry College of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004HebeiChina Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105HunanChina

Ni-rich layered oxides are one of the most promising cathode materials for Li-ion batteries due to their high energy ***,the chemomechanical breakdown and capacity degradation associated with the anisotropic lattice evolution during lithiation/delithiation hinders its practical ***,by utilizing the in situ environmental transmission electron microscopy(ETEM),we provide a real time nanoscale characterization of high temperature solid-state synthesis of LiNi_(0.8)CO_(0.1)Mn_(0.1)O_(2)(NCM811) cathode,and unprecedentedly reveal the strain/stress formation and morphological evolution mechanism of primary/second ary particles,as well as their influence on electrochemical *** show that stress inhomogeneity during solid-state synthesis will lead to both primary/secondary particle pulverization and new grain boundary initiation,which are detrimental to cathode cycling stability and rate *** to alleviate this multiscale strain during solid-state synthesis,we introduced a calcination scheme that effectively relieves the stress during the synthesis,thus mitigating the primary/secondary particle crack and the detrimental grain boundaries formation,which in turn improves the cathode structural integrity and Li-ion transport kinetics for long-life and high-rate electrochemical *** work remarkably advances the fundamental understanding on mechanochemical properties of transition metal oxide cathode with solid-state synthesis and provides a unified guide for optimization the Ni-rich oxide cathode.

关键词： Ni-rich cathode In situ ETEM Solid-state synthesis Multiscale strain alleviation

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Research on the reconstruction method of porous media using multiple-point geostatistics

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Science China(Physics,Mechanics & Astronomy) 2010年第9期53卷 122-134页

作者： ZHANG Ting 1,2,3, LI DaoLun 1,2 , LU DeTang 1,2 & YANG JiaQing 1,2 1 Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China 2 Research Center of Oil and Natural Gas, University of Science and Technology of China, Hefei 230027, China 3 The 28th Research Institute, China Electronics Technology Group corporation, Nanjing, 210007, China University of Science and Technology of China Department of Modern Mechanics Hefei China (GRID:grid.59053.3a) (ISNI:***) University of Science and Technology of China Research Center of Oil and Natural Gas Hefei China (GRID:grid.59053.3a) (ISNI:***) China Electronics Technology Group corporation The 28th Research Institute Nanjing China (GRID:grid.464269.b) (ISNI:***) University of Science and Technology of China Department of Modern Mechanics Hefei China (GRID:grid.59053.3a) (ISNI:***) University of Science and Technology of China Research Center of Oil and Natural Gas Hefei China (GRID:grid.59053.3a) (ISNI:***)

The pore structural characteristics have been the key to the studies on the mechanisms of fluids flow in porous media. With the development of experimental technology, the modern high-resolution equipments are capable of capturing pore structure images with a resolution of microns. But so far only 3D volume data of millimeter-scale rock samples can be obtained losslessly. It is necessary to explore the way of virtually reconstructing larger volume digital samples of porous media with the representative structural characteristics of the pore space. This paper proposes a reconstruction method of porous media using the structural characteristics captured by the data templates of multiple-point geostatistics. In this method, the probability of each structural characteristic of a pore space is acquired first, and then these characteristics are reproduced according to the probabilities to present the real structural characteristics in the reconstructed images. Our experimental results have shown that: (i) the deviation of LBM computed permeability respectively on the virtually reconstructed sandstone and the original sample is less than 1.2%; (ii) the reconstructed sandstone and the original sample have similar structural characteristics demonstrated by the variogram curves.

关键词： porous media reconstruction multiple-point geostatistics pore space training image variogram data template

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Analysis of structural behavior during collision event accounting for bow and side structure interaction

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Theoretical & Applied Mechanics Letters 2017年第1期7卷 6-12页

作者： Aditya Rio Prabowo Dong Myung Bae Jung Min Sohn Ahmad Fauzan Zakki Bo Cao Qing Wang Interdisciplinary Program of Marine Convergence Design Pukyong National University Busan 48513 Republic of Korea Department of Naval Architecture Diponegoro University Tembalang Semarang 50268 Central Java Indonesia Department of Naval Architecture and Marine Systems Engineering Pukyong National University Busan 48513 Republic of Korea China Shipbuilding Industry corporation Economic Research Center Beijing 100012 China College of Shipbuilding Engineering Harbin Engineering University Harbin 150000 China

The main goal of this study was to investigate the effects of selected ship collision parameter values on the characteristics of the absorbed energy in several ship collision scenarios. Non-linear simulations were performed using a finite element method （FEM） to obtain virtual experiment data. In the present research, the size of the side damage from a collision phenomenon were measured and used to verify the numerical configuration together with the calculation results using an empirical equation. Parameters in the external dynamics of a ship collision such as the location of the contact point and velocity of the striking ship were taken into consideration. The internal energy and deformation size on the side structure were discussed further in a comparative study. The effects of the selected parameters on several structural behaviors, namely energy, force, and damage extent were also observed and evaluated in this section. Stiffener on side hull was found to contribute significantly into resistance capability of the target ship against penetration of the striking bow. Remarkable force during penetration was observed to occur when inner shell was crushed as certain velocity was applied in the striking bow.

关键词： Collision phenomenon Bow-side hull interaction Finite element analysisInternal energy Damage extent

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The DASA Graben in Northern Niger:A Case of a Paleo-Mesozoic Basin Evolving from Uplifting to Rifting

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Journal of Geological Resource and Engineering 2020年第3期8卷 67-79页

作者： Sani Abdoulwahid KonatéMoussa Wollenberg Peter Department of Geology Abdou Moumouni UniversityB.P.10662NiameyNiger Global Atomic corporation TorontoCanada

The N70°DASA graben is a closed-rift that seems to be the deepest part of the Tim MersoïBasin,which is located in the northwestern part of Niger in West *** contains more than 805 m of Paleozoic-Mesozoic *** tectonic subsidence and uplifting was calculated by using well log data and deducing the variations in sedimentary thicknesses over *** mapping and tectono-sedimentary analysis indicate that the structural evolution of the DASA trough is characterized by two major periods:(1)the first period was marked by an uplift stage ranging from the Carboniferous to the *** was typified by a weak subsidence rate(3.45 m/Ma on average),under a transpressive tectonic regime,with a decrease in the thickness of the sedimentary series along the axial zone of the trough,and an increase of the thickness towards the border areas;(2)the second period was characterized by a higher subsidence rate(4.11 m/Ma on average)related to a change in the tectonic *** was marked by a rifting stage preserved over a long period,subjected to an extensive tectonic regime,from the Triassic to the lower Cretaceous,during which the highest thicknesses of the sedimentary series developed in the axial zone of the *** structural and sedimentological features defined the DASA graben as a particular type of syn-sedimentary basin evolving from a transpressive tectonic regime during the Paleozoic to an extensive tectonic regime during the Lower ***,the second period marked by an extensional regime would probably be related to the opening of the first stages of the Atlantic Ocean.

关键词： DASA graben tectono-sedimentary uplift rifting polyphasic evolution north Niger.

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Challenge to Welding and Joining Technology for Applying Multi-material in Electric Vehicle Production

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材料科学与工程（中英文A版） 2022年第4期12卷 107-114页

作者： Tomoyuki Ueyama Shinichi Hasegawa Takaaki Miyauchi Testuo Era Hidetoshi Fujii DAIHEN(OTC)corporation Kobe 658-0033Japan Joining and Welding Research Institute Osaka University Ibaraki 567-0047Japan

Advanced high strength steel,aluminum alloy and plastic materials are used in the right places for the purpose of reducing the weight of EV(electric vehicle)bodies and in-vehicle parts,and multi-material structures are ***,it is difficult to handle the welding and joining processes of automobile structures by the conventional arc welding and resistance spot welding,which have been applied to steel joining,and various joining processes are being applied depending on the *** above mentioned background,the authors have developed some unique joining processes for multi-materials that are used in the right *** paper introduces the dissimilar metal joining between the galvanized steel and aluminum alloy by laser arc hybrid process,the metal/thermoplastic dissimilar material joining using laser process and the solid-state resistance spot joining process of advanced high strength steel for EV body structural ***,the authors describe the high-speed plasma jet GTA(Gas Tungusten Arc)welding process of copper applied to electrical components such as motors.

关键词： Arc welding laser arc hybrid dissimilar joining spot joining electric vehicle.

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Collapse and Reinforcement of Pipe-Framed Greenhouse under Static Wind Loading

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Journal of Civil Engineering and Architecture 2020年第11期14卷 583-594页

作者： Yasushi Uematsu Kazuya Takahashi National Institute of Technology(KOSEN) Akita CollegeAkita 011-8511Japan Engineering Headquarters Shimizu CorporationChuo-kuTokyo 104-8370Japan

The present paper investigates the collapse process of a pipe-framed greenhouse under static wind loading based on a non-linear finite element *** purpose is to establish a more reasonable wind resistant design method for such *** structures are so flexible that the fluid-structure interaction(FSI)is considered in the *** practice,iterative analyses of the structure’s response and the wind pressure distribution on the deformed structure are *** wind direction is normal to the *** fluid dynamics(CFD)analysis with a RANS turbulence model is used for evaluating the time-averaged wind pressure coefficient distribution on the *** the geometric and the material non-linearity are considered in the structural *** collapse behavior obtained is consistent with the practical one often observed in damage *** on the results,discussion is made of the validity of the current design guideline commonly used in *** same analysis is carried out for various reinforced *** effect of each reinforcement method on the improvement of wind resistance of the structure is investigated on the basis of the allowable stress and deformation limits specified in the current design guideline.

关键词： Pipe-framed greenhouse static wind loading collapse process reinforcement FSI CFD finite element method(FEM)

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