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Transient heat conduction analysis using the NURBS-enhanced scaled boundary finite element method and modified precise integration method

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Acta Mechanica Solida Sinica 2017年第5期30卷 445-464页

作者： Gao Lin Peng Li Jun Liu pengchong zhang School of Hydraulic Engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Center for Offshore Foundation Systems Faculty of EngineeringUniversity of Western AustraliaPerth WA6009Australia

The Non-uniform rational B-spline （NURBS） enhanced scaled boundary finite element method in combination with the modified precise integration method is proposed for the transient heat conduction problems in this paper. The scaled boundary finite element method is a semi-analytical technique, which weakens the governing differential equations along the circumferential direction and solves those analytically in the radial direction. In this method, only the boundary is discretized in the finite element sense leading to a re- duction of the spatial dimension by one with no fundamental solution required. Neverthe- less, in case of the complex geometry, a huge number of elements are generally required to properly approximate the exact shape of the domain and distorted meshes are often un- avoidable in the conventional finite element approach, which leads to huge computational efforts and loss of accuracy. NURBS are the most popular mathematical tool in CAD industry due to its flexibility to fit any free-form shape. In the proposed methodology, the arbitrary curved boundary of problem domain is exactly represented with NURBS basis functions, while the straight part of the boundary is discretized by the conventional Lagrange shape functions. Both the concepts of isogeometric analysis and scaled boundary finite element method are combined to form the governing equations of transient heat conduction analy- sis and the solution is obtained using the modified precise integration method. The stiffness matrix is obtained from a standard quadratic eigenvalue problem and the mass matrix is determined from the low-frequency expansion. Finally the governing equations become a system of first-order ordinary differential equations and the time domain response is solved numerically by the modified precise integration method. The accuracy and stability of the proposed method to deal with the transient heat conduction problems are demonstrated by numerical examples.

关键词： Transient heat conduction analysisScaled boundary finite elementmethodNURBSIsogeometric analysisModified precise integration method

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Early-age Hydration Characteristics of Composite Binder Containing Graphite Powder

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Journal of Wuhan University of Technology(Materials Science) 2022年第6期37卷 1252-1261页

作者： HE Wei SONG Shaomin MENG Xia zhang pengchong SUN Xu School of Civil and Transportation Engineering Beijing University of Civil Engineering and ArchitectureBeijing 100044China Architectural Design and Research Institute of Tsinghua University Co. Ltd.Beijing 100084China

The early-age hydration characteristics of composite binder containing graphite powder(GP)with two different finenesses were investigated by determining the hydration heat,thermo gravimetric,morphology of hardened paste as well as the compressive strength of *** experimental results show that:replacing 2%-6%of cement with graphite powder significantly improves the piezoresistive effect of early age mortar,can be used to monitor accidental loads caused by dropped objects,collisions,or other accident events,and thus avoids initial *** GP provides additional nucleation sites that lead to a fast formation of hydration products(nucleation-site effect).However,due to the almost hydrophobic water contact angle,most of the GP causes a large number of micro-cracks in the hydrated paste(gap effect).Because of the lamellar shape and high surface energy,GP is easily balled and can not be uniformly distributed in the composite,resulting in clumping together and wrapping some of the cement particles(barrier effect).Due to nucleation-site effect,when the dosages of coarse and fine GP reached 2%and 4%,1 d strength were increased by 9.1%and 9.6%,*** 3 days,as the interior damage caused by the gap effect gradually increased,and the retarding effect on cement hydration caused by barrier effect was *** has an obvious negative effect on compressive ***,micro-cracks caused by fine GP are less,so its negative effect on 3 d compressive strength is lower.

关键词： graphite powder Portland cement early-age hydration piezoresistive effect comprehensive strength

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The Static Solution for the Layered Piezoelectric Bounded Domain with Side Face Load by the Modified SBFEM

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Advances in Applied Mathematics and Mechanics 2018年第1期10卷 209-241页

作者： Shan Lu Jun Liu Gao Lin Zihua zhang pengchong zhang State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalianLiaoning 116024China School of Hydraulic Engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalianLiaoning 116024China Ocean Engineering Joint Research Center of DUT-UWA State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalianLiaoning 116024China Faculty of Civil Engineering Ningbo University315211China

The static response of two-dimensional horizontal layered piezoelectric bounded domain with side face load was *** this paper,the modified scaled boundary finite element method(SBFEM)is provided as an effective semi analytical *** method is used to solve the static problem for the layered piezoelectric bounded *** scaling line definition extends the SBFEM to be more suitable for analyzing the multilayered piezoelectric bounded *** avoids the limitations of original SBFEM in modeling the horizontal layered bounded *** modified SBFEM governing equation with piezoelectric medium is derived by introducing Duality variable in the Hamilton *** derivation technology makes the progress be *** novel displacement and electric governing equations of the modified SBFEM is given together by the first *** node forces can be expressed as power exponent function with radial coordinate by introducing the auxiliary variable and using the eigenvalue *** novel modified SBFEM solution of layered bounded domain with piezoelectric medium is *** new power expansion function of layered piezoelectric medium with side face load is *** technology significantly extends the application range of modified *** novel treatment of side face load for the layered piezoelectric bounded domain is *** studies are conducted to demonstrate the accuracy of proposed technique in handling with the static problem of layered bounded domain with piezoelectric medium for side face *** influence of the side face load type and depth are discussed in detail.

关键词： Modified scaled boundary finite element method piezoelectric medium side face load layered bounded domain

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Electrochemical Identification of Yulania spp. by Fingerprinting of Leaves Using Glassy Carbon Electrode

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Phyton-International Journal of Experimental Botany 2022年第11期91卷 2549-2558页

作者： Zhiguo Lu Yuhong Zheng pengchong zhang Boyuan Fan Aimin Yu Li Fu Institute of Botany Jiangsu Province and Chinese Academy of Sciences(Nanjing Botanical GardenMem.Sun Yat-Sen)Nanjing210014China Hangzhou Botanical Garden(Hangzhou West Lake Academy of Landscape Science) Hangzhou310013China College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhou310018China Department of Chemistry and Biotechnology Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyHawthornVIC 3122Australia

In this communication,we used electrochemical sensor for recording the electrochemical profiles of eleven species of Yulania *** leaf *** solvents and two buffer conditions were used for electrochemical fingerprints *** electrochemical fingerprints can be converted to different patterns and consequently for species *** results indicate the pattern recognition is much convenient than that of the recognition of species directly using voltammetric *** current information in electrochemical fingerprinting represents the type and amount of electrochemically active molecules,which linked to the genetic differences among the ***,the electrochemical fingerprints were applied for further phylogenetic *** phylogenetic tree deduced from voltametric curves is divided into three main *** first clade contains ***,Liriodendron chinense,***,***,*** second clade contains ***,***,***,and *** third clade contains Y.×soulangeana,Manglietia fordiana and *** addition,*** is not in these main *** results demonstrate that electrochemical fingerprinting can be used as a com-plementary tool in the study of phylogenetics.

关键词： Phylogenetic Yulania spp. plant identification fingerprints chemotaxonomy

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瓦斯压力在线监测预警机制应用研究

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中国矿业 2020年第S1期29卷 131-135,154页

作者：张鹏冲瓦斯灾害监控与应急技术国家重点实验室重庆400037 中煤科工集团重庆研究院有限公司重庆400037

为了能准确、有效、及时地预测预报井下煤矿瓦斯突出,根据高瓦斯煤层应力场与瓦斯场具有典型的耦合效应,且瓦斯压力场与地应力场的关系主要表现在瓦斯压力的变化上这一原理,在平煤股份十矿己15-16煤层和己17煤层安装一套煤矿瓦斯突出灾... 详细信息

为了能准确、有效、及时地预测预报井下煤矿瓦斯突出,根据高瓦斯煤层应力场与瓦斯场具有典型的耦合效应,且瓦斯压力场与地应力场的关系主要表现在瓦斯压力的变化上这一原理,在平煤股份十矿己15-16煤层和己17煤层安装一套煤矿瓦斯突出灾害实时监测预警系统,利用该系统中的煤层瓦斯压力实时监测功能,实时在线监测揭煤区域煤层瓦斯压力变化情况。结果表明:煤层瓦斯压力变化随着瓦斯抽放时间而降低,而随着瓦斯解吸量的增加升高;监控到的瓦斯突出煤层瓦斯压力的变化符合正常规律,开发的煤矿瓦斯突出灾害监测预警系统能够连续监测煤层瓦斯压力及其变化动态,为煤矿瓦斯突出灾害监测预警提供了技术基础和有效手段。

关键词：瓦斯突出瓦斯压力预警系统连续在线监测

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谢桥矿半原位沿空留巷技术

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煤矿安全 2014年第8期45卷 104-106页

作者：张鹏冲张农季卫斌中煤科工集团重庆研究院有限公司重庆400037 中国矿业大学矿业工程学院江苏徐州221116 中国矿业大学深部煤炭资源开采教育部重点实验室江苏徐州221116

针对谢桥矿11426综采工作面所处地质条件,基于"Y"型通风沿空留巷煤与瓦斯共采理论,解决了架棚巷道沿空留巷的支护难题,采用半原位留巷顶板4大主动控顶区强化控制技术提高顶板稳定性,详细介绍了留巷期间顶板及墙体的加固方案和留巷充填... 详细信息

针对谢桥矿11426综采工作面所处地质条件,基于"Y"型通风沿空留巷煤与瓦斯共采理论,解决了架棚巷道沿空留巷的支护难题,采用半原位留巷顶板4大主动控顶区强化控制技术提高顶板稳定性,详细介绍了留巷期间顶板及墙体的加固方案和留巷充填工艺。现场矿压观测数据显示,架棚留巷中空注浆锚索索注一体化控顶配合4大区域主动控顶,有效地控制了巷道变形。留巷稳定后断面面积满足要求,试验达到预期效果,从而证明了该留巷技术的科学性。

关键词：半原位留巷架棚巷道充填工艺矿压观测

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碱和微波改性沸石及对亚铁离子的吸附研究

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非金属矿 2012年第1期35卷 70-72,80页

作者：栗印环张秀兰张倩张鹏冲信阳师范学院化学化工学院河南信阳464000

采用微波辐射技术和NaOH对天然沸石进行活化改性处理,研究了改性沸石对水溶液中Fe2+的吸附性能及影响因素。结果表明:经浓度为0.8 mol/L的NaOH和微波功率480W辐射5 min改性的沸石吸附性能良好,在溶液pH值为7及常温条件下,改性沸石在用量... 详细信息

采用微波辐射技术和NaOH对天然沸石进行活化改性处理,研究了改性沸石对水溶液中Fe2+的吸附性能及影响因素。结果表明:经浓度为0.8 mol/L的NaOH和微波功率480W辐射5 min改性的沸石吸附性能良好,在溶液pH值为7及常温条件下,改性沸石在用量为10 g/L、振荡吸附时间为40 min时,对质量浓度为224 mg/L的Fe2+的去除率为99.5%。改性沸石对Fe2+的吸附规律较好地符合Langmuir吸附等温式。采用0.8 mol/L的NaOH作为改性沸石的再生剂,可使其再生重复使用。

关键词：微波改性沸石吸附亚铁离子再生

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基于人工透射边界的核电厂结构抗震分析

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核动力工程 2016年第5期37卷 24-28页

作者：李建波梅润雨林皋张鹏冲大连理工大学海岸与近海工程国家重点实验室辽宁大连116024

目前核电厂结构-地基地震动力相互作用模型仍局限为规范建议的简单集总参数模型,或以粘弹性边界为代表的基本有限元地基模型,缺乏精度相对较高的分析方法。本文将高精度的二次透射人工边界地基模型引入核电结构抗震的分析领域,针对厂房... 详细信息

目前核电厂结构-地基地震动力相互作用模型仍局限为规范建议的简单集总参数模型,或以粘弹性边界为代表的基本有限元地基模型,缺乏精度相对较高的分析方法。本文将高精度的二次透射人工边界地基模型引入核电结构抗震的分析领域,针对厂房结构的复杂约束,采用隐显式方法求解,显式积分时域结果后处理等关键问题,基于ANSYS软件提出了模型解决方案,并以实例形式验证了本文方法与模型的适用性。结果表明,文中模型适用于核电厂建筑物动力响应的有限元分析。

关键词：透射人工边界结构-地基动力相互作用核电厂结构抗震安全评价

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突出矿井水力压裂增透技术应用研究

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能源与环保 2021年第7期43卷 66-71页

作者：张鹏冲瓦斯灾害监控与应急技术国家重点实验室重庆400037 中煤科工集团重庆研究院有限公司重庆400037

针对煤与瓦斯突出矿井煤层透气性差、瓦斯较难抽采的现状,为提高突出矿井的抽采效果,改善矿井抽掘采衔接紧张的局面,提出采用水力压裂增透技术,结合保安矿现场实际考察应用情况,详细介绍了适用于矿井的水力压裂工艺流程及参数。现场实... 详细信息

针对煤与瓦斯突出矿井煤层透气性差、瓦斯较难抽采的现状,为提高突出矿井的抽采效果,改善矿井抽掘采衔接紧张的局面,提出采用水力压裂增透技术,结合保安矿现场实际考察应用情况,详细介绍了适用于矿井的水力压裂工艺流程及参数。现场实践表明,水力压裂后,掘进条带区域的煤层瓦斯抽采纯量相比原始未压裂煤体的瓦斯抽采纯量提高1倍以上,煤层透气性系数相比原始煤层透气性系数提高8倍以上。水力压裂技术可精准提高矿井煤层的透气性,增大瓦斯抽采浓度和抽采量,大大缩短了瓦斯预抽时间,可进一步提升瓦斯抽采钻孔的抽采能力,有效缩短抽采达标时间,为采煤工作面本煤层预抽提供了瓦斯抽采空间,解决了矿井抽掘采衔接紧张问题,可为相似地质条件矿井提供参考。

关键词：突出矿井掘进条带穿层钻孔水力压裂煤层透气性工艺流程

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突出矿井瓦斯抽采参数优化研究与应用

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现代矿业 2020年第8期36卷 194-196页

作者：张鹏冲瓦斯灾害监控与应急技术国家重点实验室重庆400037 中煤科工集团重庆研究院有限公司

围绕突出矿井瓦斯抽采参数设定,进行了相应的理论计算。针对二景矿15205工作面,在充分考察不同钻孔间距抽采数据的基础上,通过分析比较不同试验区域瓦斯抽采达标时间,得到了抽采钻孔间距与抽采达标时间的关系。研究成果得到了成功应用... 详细信息

围绕突出矿井瓦斯抽采参数设定,进行了相应的理论计算。针对二景矿15205工作面,在充分考察不同钻孔间距抽采数据的基础上,通过分析比较不同试验区域瓦斯抽采达标时间,得到了抽采钻孔间距与抽采达标时间的关系。研究成果得到了成功应用和检验,为类似矿井瓦斯抽采参数优化提供了参考。

关键词：突出矿井抽采达标参数优化抽采半径

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