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10th International Conference on Structural Health Monitoring of Intelligent Infrastructure, SHMII 2021

作者： Nie, Zhenhua Xie, Yongkang Ma, Hongwei College of Science & Engineering Jinan University Guangdong Guangzhou China The Key Laboratory of Disaster Forecast and Control in Engineering Guangdong Guangzhou China Dongguan University of Technology Dongguan China

Vibration response based damage detection methods have attracted much attention due to that they are model free methods. However, in the most of structural health monitoring systems, excessive number of sensors installed on the bridge bring high costs and huge data. In this paper, a novel damage detection method based on recursive principal component analysis (RPCA) is proposed. The displacement responses are collected and decomposed recursively to obtain the orthogonal projection deviation at each moment while the moving vehicle is passing through the bridge. When the moving vehicle passes the damage location, a significant change of projection deviation will occur due to the discontinuity of the responses, which can be used to indicate the damage location. Numerical simulations performed on a simply supported beam bridge subjected to a moving load demonstrate the effectiveness of the proposed approach. It is noticed that only two sensors without limitation of placement location are needed in this data-driven method while no reference data is required, which leads the presented approach to be a good candidate for baseline free structural health monitoring with very limited measurement information. © 2021 International Conference on Structural Health Monitoring of Intelligent Infrastructure: Transferring Research into Practice, SHMII. All rights reserved.

关键词： Damage detection

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Comparative studies on Structural Damage Detection using different kinds of Objective Functions based on Modal Data

Comparative studies on Structural Damage Detection using dif...

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International Conference on Intelligent Transportation, Big Data & Smart City (ICITBS)

作者： Zepeng Chen Di Zhao School of Transportation and Civil Engineering & Architecture Foshan University Foshan China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

In order to investigate the ability of different objective functions based on modal data for SDD problems, six objective functions are defined and a comparison study is presented in this paper. To make a fair comparison, a quantified index name damage vector consistency is defined to describe the consistency between the identified damage vector factor and the assume one. Simply-supported beam with 10 finite elements is simulated which provides modal data generation and damage cases simulation. The percentage of DVC equaling to 100% in the all 100 times is also calculated which shows the objective function based on MTMAC is the best one for SDD.

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New finite strain elastoplastic equations for accurately and explicitly simulating pseudoelastic-to-plastic transition effects of shape memory alloys

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Applied Mathematics and Mechanics(English Edition) 2020年第10期41卷 1583-1596页

作者： Siyu WANG Lin ZHAN Huifeng XI Heng XIAO School of Mechanics and Construction Engineering MOE Key Lab of Disaster Forecast and Control in EngineeringJinan University601 West Huangpu AvenueGuangzhou 510632China Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China

A new finite strain elatoplastic J2-flow model with coupling effects of both isotropic and anisotropic hardening is proposed with the co-rotational logarithmic *** terms of certain single-variable shape functions representing uniaxial loading and unloading curves,explicit multi-axial expressions for the three hardening quantities incorporated in the new model proposed are derived in unified forms for the purpose of automatically and accurately simulating complex pseudoelastic-to-plastic transition effects of shape memory alloys(SMAs)under multiple loading-unloading *** examples show that with only a single parameter of direct physical meaning for each cycle,accurate and explicit simulations may be achieved for extensive data from multiple cycle tests.

关键词： shape memory alloy(SMA) finite deformation pseudo-elasticity plasticity cyclic loading transition effect elastoplastic equation explicit and accurate approach

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Detection and Attribution of Changes in Thermal Discomfort over China during 1961-2014 and Future Projections

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Advances in Atmospheric Sciences 2022年第3期39卷 456-470,543-552页

作者： Wanling LI Xin HAO Li WANG Yuqing LI Jiandong LI Huixin LI Tingting HAN Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of EducationNanjing University of Information Science and TechnologyNanjing 210044China Nansen-Zhu International Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China

In this study, variation in the frequency of thermal discomfort days over China during the period of 1961-2014,including heat discomfort days(HDDs) and cold discomfort days(CDDs), and the influence of external forcings on it are discussed. HDDs are the conditions of overheating and overhumidity(represented by humidity index), and CDDs reflect the dangers from cold temperatures and winds(represented by wind chill index). Observations show significant increases(decreases) in the frequency of HDDs(CDDs) over China from 1961 to 2014, with clear regional distinctions. The historical ALL and greenhouse gas(GHG) simulations can sufficiently reproduce the spatial patterns of the observational trend in the frequency of both HDDs and CDDs over China. Further, the impacts of GHG and anthropogenic forcings on the HDDs(CDDs) are detectable over China, except for central and eastern China, based on the optimal fingerprinting method. GHG forcing is identified as a dominant factor for the observational changes in the frequency of HDDs over southern China;GHG and anthropogenic forcings have dominant effects on the variation in the frequency of CDDs over southwestern China. Although trends in the frequency of HDDs and CDDs in historical aerosol forcing simulations seems to be opposite to observations, an aerosol signal fails to be detected. Natural forcing contributes to the observational variation in the frequency of HDDs over northwestern China. In addition, the future projections of thermal discomfort days indicate that Chinese residents will face more threats of heat discomfort and fewer threats of cold discomfort in the future under global warming.

关键词： thermal discomfort greenhouse gas anthropogenic influence natural forcing aerosol forcing

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Full Characterization of the Work-Hardening Behavior of Metals:An Accurate and Explicit Approach

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Acta Mechanica Solida Sinica 2020年第4期33卷 479-486页

作者： Zan Zhou Siyu Wang Lin Zhan Huifeng Xi Heng Xiao School of Mechanics and Construction Engineering and MOE Key Lab of Disaster Forecast and Control in Engineering Jinan UniversityGuangzhou 510632China Shanghai Institute of Applied Mathematics and Mechanics&School of Mechanics and Engineering Science Shanghai UniversityShanghai 200072China

A new approach is proposed to characterize the work-hardening behavior of metals based on the stress-strain data from uniaxial extension *** this new approach,the yield strength as a function of the plastic work can be determined by directly fitting a wellchosen single-variable shape function to any given uniaxial data from the initial yielding up to the strength limit,in an explicit sense with no need to carry out the usual tedious trial-and-error procedures in treating nonlinear elastoplastic rate equations toward identifying numerous unknown *** examples show that the simulation results with the new approach are in accurate agreement with the test data.

关键词： Metals Elastoplasticity Finite strain Work-hardening Yield strength Strength limit Explicit characterization

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Numerical Simulation of Harmonic Response Analysis for Small Out-Line Package

Numerical Simulation of Harmonic Response Analysis for Small...

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Software engineering, Social Network Analysis and Intelligent Computing (SSAIC), Asia-Pacific Conference on

作者： Hai Lin Xianshan Dong Wei Su Qinwen Huang Agam Tomar School of Mechanics and Construction Engineering Jinan University Guangzhou China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key lab of Disaster Forecast and Control in Engineering Guangzhou China Faculty of Engineering and Mathematical Sciences University of Western Australia Australia

ISBN: (数字)9798350393682

ISBN: (纸本)9798350393699

In order to discuss the influence of the number of sheets on acceleration and frequency curve of sample surface, the finite element model of clamp, SOP sample and metal sheet is firstly established with Solidworks. Different number of sheets are laid on the surface of SOP sample. Then changing the number of the paper sheets, harmonic response analysis is converted based on modal analysis. The influence of different number of sheet on acceleration and frequency curve is discussed. The results show the relation between acceleration-frequency curve of different thickness of paper, which provides reference for packaging design.

关键词： Solid modeling Social networking (online) Modal analysis Metals Packaging Harmonic analysis Numerical simulation

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The Effects of RF Power and Cavity Structure on the Plasma Discharge Characteristics of RPS

The Effects of RF Power and Cavity Structure on the Plasma D...

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Electronics and Devices, Computational Science (ICEDCS), International Conference on

作者： Hai Lin Wei Su Ming Chen Renhuai Liu School of Mechanics and Construction Engineering Jinan University Guangzhou China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Guangzhou China

In this paper, a two-dimensional model of plasma diffusion in remote plasma source discharge chamber is established by COMSOL plasma module. The electron density and electron temperature distributions inside the discharge cavity were obtained by adjusting the thickness of alumina coating and the magnitude of RF power parameters. Based on the results, the authors discuss the effects of different alumina coating thickness and RF power on the electron density and electron temperature inside the discharge cavity, which provide theoretical guidance for the subsequent optimization of the internal structure of the discharge cavity and the discharge parameters.

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Research of Mechanism and Experimental on Deformation and Permeability of Low Permeability Coal Under the Stress Loading and Methane Desorption

SSRN

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SSRN 2023年

作者： Peng, Jiansong Li, Zhiqiang State Key Laboratory of Coal mine Disaster Dynamics and Control Chongqing University Chongqing400030 China MOE Engineering Center of Mine Disaster Prevention and Rescue Henan Polytechnic University Henan Jiaozuo454000 China

The deformation characteristics of coal are the important factor affecting the permeability of gas desorption-migration. There is a great significance for exploring evolution law between the deformation and permeability of coal body during the process of gas desorption and migration to improve the gas extraction efficiency. The self-developed triaxial desorption-migration strain test system was used to carry out the simultaneous test of desorption-migration apparent permeability and deformation of different gas pressures, confining pressures and different types of gases. The experimental method for measuring the apparent permeability in the process of gas desorption-migration was proposed. The characteristics of deformation and apparent permeability in the process of gas desorption and migration was analyzed. An evolution model was established for investigating the relationship between apparent permeability and desorption strain during the process of gas desorption and migration based on elasticity theory and conservation principle. In the process of gas adsorption-desorption-migration in low permeability coal seam, the relationship among desorption strain, gas pressure, stress and apparent permeability is discussed. Meanwhile, the dominant factors of coal deformation are analyzed. Subsequently, the axial swelling deformation decreases first and then increases with the decrease of gas pressure of CH4. At the high gas pressure stage, the radial compression deformation decreases gradually, and at the low gas pressure stage, the radial swelling deformation increases gradually. But the axial deformation is larger than the radial deformation as a whole. The axial strain and volumetric strain are linear with time, and the radial strain is power function with time. The fitting show that the apparent permeability has an exponential relationship with the volumetric strain difference of adsorption-desorption-migration. The comparison test between CH4 and He shows that the def

关键词： Desorption

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One family of 13315 stable periodic orbits of non-hierarchical unequal-mass triple systems

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Science China(Physics,Mechanics & Astronomy) 2021年第1期64卷 108-113页

作者： XiaoMing Li XiaoChen Li ShiJun Liao MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction EngineeringJinan UniversityGuangzhou510632China Department of Earth Atmospheric and Planetary SciencesMassachusetts Institute of TechnologyCambridge02139USA School of Civil Engineering and Transportation South China University of TechnologyGuangzhou510641China Department of Engineering Science University of OxfordOxfordOX13PJUK Center of Advanced Computing School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai200240China

The three-body problem can be traced back to Newton in 1687,but it is still an open question *** that only a few periodic orbits of three-body systems were found in 300 years after Newton mentioned this famous *** triple systems are common in astronomy,practically all observed periodic triple systems are hierarchical(similar to the Sun,Earth and Moon).It has traditionally been believed that non-hierarchical triple systems would be unstable and thus should disintegrate into a stable binary system and a single star,and consequently stable periodic orbits of non-hierarchical triple systems have been expected to be rather ***,we report here one family of 135445 periodic orbits of non-hierarchical triple systems with unequal masses;13315 among them are *** with the narrow mass range(only 10-5)in which stable"Figure-eight"periodic orbits of three-body systems exist,our newly found stable periodic orbits have fairly large mass *** find that many of these numerically found stable non-hierarchical periodic orbits have mass ratios close to those of hierarchical triple systems that have been measured with astronomical *** implies that these stable periodic orbits of non-hierarchical triple systems with distinctly unequal masses quite possibly can be observed in *** investigation also suggests that there should exist an infinite number of stable periodic orbits of non-hierarchical triple systems with distinctly unequal *** that our approach has general meaning:in a similar way,every known family of periodic orbits of three-body systems with two or three equal masses can be used as a starting point to generate thousands of new periodic orbits of triple systems with distinctly unequal masses.

关键词： three-body problem non-hierarchical system periodic orbits

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Seasonal to interannual prediction of air pollution in China:Review and insight

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Atmospheric and Oceanic Science Letters 2022年第1期15卷 21-26页

作者： Zhicong Yin Huijun Wang Hong Liao Ke Fan Botao Zhou Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjingChina Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) ZhuhaiChina Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjingChina School of Atmospheric Sciences Sun Yat-sen University/Guangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesGuangzhouChina

Complex air pollution problems have resulted in considerable adverse impacts on the environment,human health,and economy in ***,owing to strict regulations since 2013,the air quality has been greatly ***,the prevention of air pollution has entered a critical stage in combination with climate change mitigation in *** seasonal to interannual prediction of air pollution(haze,surface 03,and sandstorms) could support the government in planning for air pollution control on an annual *** from all over the world have made great progress in understanding climate change and the variability of air pollution and associated physical mechanisms in China,which has provided a scientific basis for the development of climate prediction of air *** paper reviews the progress made in air-pollution climate prediction,and gives some critical insights including update of predictand,change of predictability,and development of coupled model.

关键词： Air pollution Climate prediction PM2.5 Ozone Sandstorm

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