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Analyzing the Form-Finding of a Large-Span Transversely Stiffened Suspended Cable System: A Method Considering Construction Processes

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World Journal of engineering and Technology 2024年第2期12卷 229-244页

作者： Junyu Chen Yanfei Wang Ke Chen Shiqing Huang Xiaowen Xu MOE Key Lab of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou China China Construction Second Engineering Bureau Second Company Shenzhen China Department of Civil Engineering Dazhou Technician College Dazhou China Key Laboratory of Product Packaging and Logistics Packaging Engineering Institute College of Packaging Engineering Jinan University Zhuhai China

The precise control of the shape of transversely stiffened suspended cable systems is crucial. However, existing form-finding methods primarily rely on iterative calculations that treat loads as fixed known conditions. These methods are inefficient and fail to accurately control shape results. In this study, we propose a form-finding method that analyzes the load response of models under different sag and stress levels, taking into account the construction process. To analyze the system, a structural finite element model was established in ANSYS, and geometric nonlinear analysis was conducted using the Newton-Raphson method. The form-finding analysis results demonstrate that the proposed method achieves precise control of shape, with a maximum shape error ranging from 0.33% to 0.98%. Furthermore, the relationships between loads and tension forces are influenced by the deformed shape of the structures, exhibiting significant geometric nonlinear characteristics. Meanwhile, the load response analysis reveals that the stress level of the self-equilibrium state in the transversely stiffened suspended cable system is primarily governed by strength criteria, while shape is predominantly controlled by stiffness criteria. Importantly, by simulating the initial tensioning process as an initial condition, this method solves for a counterweight that satisfies the requirements and achieves a self-equilibrium state with the desired shape. The shape of the self-equilibrium state is precisely controlled by simulating the construction process. Overall, this work presents a new method for analyzing the form-finding process of large-span transversely stiffened suspended cable system, considering the construction process which was often overlooked in previous studies.

关键词： Cable Structure Long-Span Structure Form-Finding Analysis Finite Element Simulation Transverse Cable Stiffening System

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Quantitative Simulation Study of Metal Additive Manufacturing by Kinetic Monte Carlo

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Journal of Applied Mathematics and Physics 2022年第5期10卷 1587-1601页

作者： Kepeng Ouyang Youdi Kuang School of Mechanics and Construction Engineering MOE Key Laboratory of Disaster Forecast and Control in Engineering Jinan Uni-versity Guangzhou China School of Civil Engineering and Architecture Wuyi University Jiangmen China

Metal additive manufacturing (AM) is a disruptive manufacturing technology that takes into account the needs of complex structural forming and high-performance component forming. At present, the understanding of metal additive manufacturing simulation methods is not thorough enough, which restricts the development of metal additive manufacturing. Present work discusses the evolution of KMC method simulation results for simulating metal additive manufacturing at different length ratios and different scanning speeds. The results reveal that as the scanning speed increases, the main grains in the simulation results are transformed from coarse columnar grains to crescent-shaped grains, which are in good agreement with the existing experimental results. Besides, as the ratio of unit physical length to unit simulation length increases, the ratio of unit physical time to unit simulation time gradually decreases.

关键词： Additive Manufacturing Kinetic Monte Carlo Simulation Grain Morphology

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Mechanical Analysis of Interface in Coating Structure under Conical Concave Indenter with FEM

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Journal of Applied Mathematics and Physics 2022年第5期10卷 1509-1524页

作者： Shi-Qing Huang Pan-Jun Tang Wen-Hua Zhang MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China School of Mechanics and Construction Engineering Jinan University Guangzhou China

The evaluation of mechanical properties of coating structures has always been a very important topic in the fields of mechanics, materials, and machinery. The traditional evaluation methods are easy to produce deviation, because the ratio of coating thickness to substrate thickness is too small. Therefore, accurate analysis and calculation is particularly important. Indentation technology is an important means of coating structure analysis and measurement, the basis of standardized application and analysis of coating structure, and a classical method for accurate analysis and calculation of coating structure. The finite element method is a very good means to analyze and study this kind of problems because of its applicability. Based on the finite element method, this paper analyzes and studies the interface connection form, substrate, and local delamination effects of the indentation behavior of the coating structure under the conical concave indenter. In this paper, the finite element method, which is more convenient for analysis and calculation, is used to analyze the influence of interface connection form, substrate, and local delamination on the coating structure. The results of force displacement, interface normal stress, and interface shear stress are analyzed in detail, and the effects of the three effects on the coating structure are proved. The significance of this study is reflected in: based on the analysis of the three effects of interface connection form, substrate, and local delamination, the mechanical properties of the coating structure are more in-depth, which provides some reference for mechanical engineers to design and test the coating structure.

关键词： Coating Structure Finite Element Method Contact Mechanics Interfacial

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Study on Parameter Measurement of Thin Films with Substrate Effect Based on Contact Mechanics

SSRN

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SSRN 2023年

作者： Zhang, Wen-Hua MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China

The development of contact theories for film are valuable for high-precision machining and measurement. Herein, based on the constitutive equations and potential theory method, accurate contact mechanics theories of films under common indenter loading are established, where the film structures are "film with two free boundaries" and "film/rigid substrate". The displacement and stress at arbitrary position can be obtained with the exact solutions, which are represented by elementary functions. It is convenient for engineers applicating the theories when addressing contact problem of films. The influence of substrate effects and film parameters on contact radius and indentation depth was analyzed. It is found that Poisson’s ratio has little influence on indentation curves, which is mainly affected by the elastic modulus. An effective method for measurement of film material parameters is presented. With numerical software platforms, the analytic algorithm could be transformed into numerical codes and be integrated in special software. © 2023, The Authors. All rights reserved.

关键词： Constitutive equations

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Predominant types of regional cold waves in North China and their historical changes

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Atmospheric and Oceanic Science Letters 2024年第4期17卷 46-51页

作者： Xinyi Cheng Yiyi Zhang Jiandong Li Xin Hao Center for Climate System Prediction Research/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of EducationNanjing University of Information Science&TechnologyNanjingChina 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

寒潮事件对东亚地区的社会经济,生态系统和人体健康影响巨大.根据1980-2019年间10月至次年3月的每日寒潮记录和K-means聚类,本文识别出了中国两种不同类型的区域性寒潮(T1和T2). T1区域性寒潮主要影响东北地区,T2区域性寒潮则主要影响... 详细信息

寒潮事件对东亚地区的社会经济,生态系统和人体健康影响巨大.根据1980-2019年间10月至次年3月的每日寒潮记录和K-means聚类,本文识别出了中国两种不同类型的区域性寒潮(T1和T2). T1区域性寒潮主要影响东北地区,T2区域性寒潮则主要影响华北和东部地区.与T1区域性寒潮相比, T2区域性寒潮强度更强,持续时间更长,影响范围更广. 1980–2019年期间, T1区域性寒潮的频率显著增加,而T2区域性寒潮的频率则没有趋势变化. T1和T2区域性寒潮事件均与西伯利亚高压增强有关,然而与它们相关的对流层中层波列明显不同.在T1区域性寒潮事件发生期间,西伯利亚-蒙古上空出现负-正模态的500-hPa位势高度异常波列,削弱了东亚大槽,导致西伯利亚冷空气东移.T1区域寒潮频次增加趋势可能与全球变暖引起的500-hPa位势高度的线性趋势变化有关.与T2区域寒潮事件相关的波列则在乌拉尔山脉,蒙古和华北地区形成了脊-槽-脊环流异常,导致冷空气向东南方向入侵.本文得出结论,由于两类区域寒潮影响不同,西伯利亚高压增强和对流层中层波列模态在我国区域性寒潮事件的预报中应综合考虑.

关键词：寒潮 K-means聚类西伯利亚高压波列

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The Enhancing Effect of the East Asian Subtropical Westerly Jet on Summer Extreme High-Temperature Events over Central-Eastern China Since the Late 1990s

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Advances in Atmospheric Sciences 2025年第3期42卷 453-466页

作者： Chujie GAO Yuyu NIU Gen LI Shanlei SUN Bo LU Chaofan LI Bei XU Jinglong HUANG Xiubao SUN College of Oceanography&Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210098China Key Laboratory of Meteorological Disaster Ministry of Education(KLME)&Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Laboratory for Climate Studies and CMA-NJU Joint Laboratory for Climate Prediction Studies National Climate CenterChina Meteorological AdministrationBeijing 100081China Xiong’an Institute of Meteorological Artificial Intellegence Xiong'an 071708China Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of the Chinese Academy of SciencesBeijing 100049China College of Intelligent Science and Control Engineering Jinling Institute of TechnologyNanjing 211169China

The increase in frequency and intensity of Extreme High-temperature Events(EHEs)over Central-Eastern China(CEC)in recent decades has severely impacted social development and *** observation and reanalysis datasets,this study explores the effect of the East Asian subtropical westerly jet stream(EAJ)on the CEC EHEs for the summers spanning 1979–*** its general relative location to the right side of the upper-level jet stream exit region,CEC would theoretically suffer more EHEs with a stronger and northwardly-shifted EAJ in summer due to the likelihood of abnormal subsidence induced by the ***,such an EAJ–EHE connection has been unstable over the past four decades but has displayed an evident interdecadal *** the late 1990s,the interannual variation of the EAJ was manifested mainly by its meridional displacement in the northeastern part of East Asia;thus,the atmospheric responses were essentially located to the east of CEC,exerting less of an influence on the CEC ***,since the late 1990s,the EAJ variation has featured an intensity change in its center over the northwest portion of the CEC,which has resulted in a westward shift in atmospheric responses to cover the CEC ***,the EAJ could potentially affect the summer CEC EHEs during 2000–*** findings offer support for an in-depth understanding of the formation mechanisms of extreme weather/climate events of this nature and thus provide a scientific reference for seasonal climate predictions.

关键词： summer extreme high-temperature events East Asian subtropical jet atmospheric circulation central-eastern China interdecadal change

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Damage evaluation of steel frame subjected to impact load at midspan

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ce/papers 2023年第3-4期6卷 1202-1206页

作者： Chen, Ying Chen, Wensu Hao, Hong Nie, Zhenhua Jinan University Guangzhou China The Key Laboratory of Disaster Forecast and Control in Engineering Guangzhou China Curtin University Curtin Australia Guangzhou University Guangzhou China

The lower floors of the multi-storey structure can be impacted by the debris from the upper floor caused by gas and bomb explosion, which may induce damage or failure of the impacted substructure and lead to progressive collapse of large-scale structure. The behavior of the frame with a steel beam and two adjacent beam-column joints was numerically analyzed when the beam was impacted at midspan by various combinations of impact mass and velocity. The failure mode of the joints, the impact load and midspan displacement were analyzed. It shows that the beam-column joint fails prior to the beam under all impact loading scenarios. The residual bearing capacity of the frame was also studied by statically pushing-down the substructure after impact loading. A damage index was proposed using the residual capacity of the frame after impact loading divided by the static capacity of the joint without impact loading, and four damage levels, i.e., the minor damage, medium damage, severe damage, and collapse, were defined by the damage index. The boundaries of different damage levels of the frame under various impact loads were fitted, and it can be used to evaluate the damage level of the frame subjected to possible impact loads. © 2023 Ernst & Sohn GmbH.

关键词： Floors

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Random vibration fatigue curve and accelerated vibration test technology of transport package

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Zhendong Gongcheng Xuebao/Journal of Vibration engineering 2022年第2期35卷 297-306页

作者： Wang, Zhi-Wei Liu, Bo Wang, Li-Jun Packaging Engineering Institute Jinan University Zhuhai519070 China MOE Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes Jinan University Zhuhai519070 China Zhuhai Key Laboratory of Product Packaging and Logistics Jinan University Zhuhai519070 China

In this paper, the relation between the von Mises equivalent stress at the concerned point and the root mean square of the excitation acceleration on the transport package under triaxial random vibration excitation is derived. The equivalence between the stress fatigue curve (σ-N curve) at the concerned point and the vibration fatigue curve (Grms-T curve) of the transport package is certificated. For the two types of damage and fatigue models commonly used in engineering, that is, the Basquin type (power function type) and the exponential function, the corresponding Grms-T equations are obtained. The time compression ratio of accelerated random vibration test for transport package is given based on the Grms-T curve, and its validity is verified by the finite element analysis of product model. As the acceleration is easy to analysis and measurement, the accelerated random vibration test technology for transport package based on the Grms-T curve has application and development potential for further researches. © 2022, Editorial Board of Journal of Vibration engineering. All right reserved.

关键词： Exponential functions

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Effect of grain refinement induced by wire and arc additive manufacture (WAAM) on the corrosion behaviors of AZ31 magnesium alloy in NaCl solution

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Journal of Magnesium and Alloys 2023年第1期11卷 217-229页

作者： Jianwei LI Youmin QIU Junjie YANG Yinying SHENG Yanliang YI Xun ZENG Lianxi CHEN Fengliang YIN Jiangzhou SU Tiejun ZHANG Xin TONG Bin GUO School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001PR China Beijing Hangxing Machinery Manufacture Limited Corporation Beijing 100013PR China Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632PR China The Third Academy of CASIC Beijing 100074PR China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan UniversityGuangzhou510632P.R.China Institute of Materials and Process Design Helmholtz-Zentrum HereonMax-Planck-Str.121502 GeesthachtGermany School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000PR China

Additive manufacturing(AM)of Mg alloys has become a promising strategy for producing complex structures,but the corrosion performance of AM Mg components remains *** this study,wire and arc additive manufacturing(WAAM)was employed to produce single AZ31 *** results revealed that the WAAM AZ31 was characterized by significant grain refinement with non-textured crystallographic orientation,similar phase composition and stabilized corrosion performance comparing to the cast *** varied corrosion behaviors were principally ascribed to the size of grain,where cast AZ31 and WAAM AZ31 were featured by micro galvanic corrosion and intergranular corrosion,respectively.

关键词： AZ31 magnesium alloy Wire and arc additive manufacturing(WAAM) Grain refinement Microstructure Intergranular corrosion

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Dynamics of a Gaussian and Non-Gaussian Vibration Excited Discrete Product Packaging System with Hyperbolic Tangent Nonlinearity

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SSRN 2023年

作者： Yang, Song-Ping Deng, Pei-Chang Wang, Zhi-Wei Packaging Engineering Institute College of Packaging Engineering Jinan University Zhuhai519070 China MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes Jinan University Zhuhai519070 China

This paper reveals the dynamical properties of a Gaussian and non-Gaussian vibration excited multi-degree-of-freedom (MDOF) discrete product packaging system (DPPS) with hyperbolic tangent nonlinearity base on a more systematic acceleration response analysis. Firstly, the product package considering multiple critical components is modeled as a general model of MDOF DPPS, centered around the opposite designed purpose with the similar multiple tuned mass damper (MTMD) model, in which the hyperbolic tangent nonlinearity is rarely considered, then approximate solution theory is established to effectively predicate the acceleration response spectrum of the hyperbolic tangent MDOF DPPS under Gaussian random vibration. Secondly, Hermite polynomial is adopted to simulate non-Gaussian vibration excitation, and verified by the actual road excitation signal. On this basis, the non-Gaussian random vibration analysis method is introduced to analyze the acceleration non-Gaussian stochastic response of the system, the sensitivity of the response to the external excitation and system parameters is discussed. Finally, the reliability analysis via the first-passage distribution of the acceleration stochastic response is given. Approximate solution theory can effectively predict acceleration response spectrum of the system under Gaussian random vibration. The proposed non-Gaussian vibration analysis approach can conveniently reproduce actual non-Gaussian vibration excitation and analyze the dynamic properties, the investigation provides a guidance for packaging vibration absorption design. © 2023, The Authors. All rights reserved.

关键词： Reliability analysis

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