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Smoothed particle hydrodynamics based numerical study of hydroplaning considering permeability characteristics of runway surface

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Frontiers of Structural and Civil Engineering 2024年第3期18卷 319-333页

作者： Yang YANG xingyi zhu Denis JELAGIN Alvaro GUARIN Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 200092China Auto Engineering Research Institute BYD Auto Industry Company LimitedShenzhen 518118China Department of Civil and Architectural Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden

The presence of water films on a runway surface presents a risk to the landing of *** tire of the aircraft is separated from the runway due to a hydrodynamic force exerted through the water film,a phenomenon called *** a lot of numerical investigations into hydroplaning have been conducted,only a few have considered the impact of the runway ***,computational problems,such as excessive distortion and computing efficiency decay,may arise with such numerical models when dealing with the thin water *** paper presents a numerical model comprising of the tire,water film,and the interaction with the runway,applying a mathematical model using the smoothed particle hydrodynamics and finite element(SPH-FE)*** material properties and geometric features of the tire model were included in the model framework and water film thicknesses from 0.75 mm to 7.5 mm were used in the numerical ***,this work investigated the impacts of both surface texture and the runway *** interaction between tire rubber and the rough runway was analyzed in terms of frictional force between the two *** SPH-FE model was validated with an empirical equation proposed by the National Aeronautics and Space Administration(NASA).Then the computational efficiency of the model was compared with the traditional coupled Eulerian-Lagrangian(CEL)*** on the SPH-FE model,four types of the runway(Flat,SMA-13,AC-13,and OGFC-13)were *** simulation of the asphalt runway shows that the SMA-13,AC-13,and OGFC-13 do not present a hydroplaning risk when the runway permeability coefficient exceeds 6%.

关键词： SPH-FE approach hydroplaning numerical simulation surface texture runway surface reconstruction

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Bird’s-eye view of recycled solid wastes in road engineering

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Journal of Road Engineering 2024年第2期4卷 93-150页

作者： zhuangzhuang Liu Tengteng Feng xingyi zhu Jie Gao Kui Hu Meng Guo Fan Gu Feng Li School of Highway Chang'an UniversityXi'an 710064China Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang'an UniversityXi'an 710064China Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 200092China School of Civil Engineering and Architecture East China Jiaotong UniversityNanchang 330013China College of Civil Engineering and Architecture Henan University of TechnologyZhengzhou 450001China State Key Laboratory of Bridge Engineering Safety and Resilience Beijing University of TechnologyBeijing 100124China Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing 100124China School of Traffic&Transportation Engineering Changsha University of Science and TechnologyChangsha 410114China School of Transportation Science and Engineering Beihang UniversityBeijing 102206China

Recent trends in road engineering have explored the potential of incorporating recycled solid wastes into infrastructures that including pavements,bridges,tunnels,and accessory *** utilization of solid wastes is expected to offer sustainable solutions to waste recycling while enhancing the performance of *** review provides an extensive analysis of the recycling of three main types of solid wastes for road engineering purposes:industrial solid waste,infrastructure solid waste,and municipal life solid *** solid wastes suitable for road engineering generally include coal gangue,fly ash,blast furnace slag,silica fume,and steel slag,*** solid wastes recycled in road engineering primarily consist of construction&demolition waste,reclaimed asphalt pavements,and recycled cement ***,recent exploration has extended to the utilization of municipal life solid wastes,such as incinerated bottom ash,glass waste,electronics waste,plastic waste,and rubber waste in road engineering *** recycled solid wastes are categorized into solid waste aggregates,solid waste cements,and solid waste fillers,each playing distinct roles in road *** of solid waste acting aggregates,cements,and fillers in road infrastructures were fully investigated,including their pozzolanic properties,integration effects to virgin materials,modification or enhancement solutions,engineering *** of these materials not only addresses the challenge of waste management but also offers environmental benefits aiming carbon neutral and contributes to sustainable infrastructure ***,challenges such as variability in material properties,environmental impact mitigation,secondary pollution to environment by leaching,and concerns regarding long-term performance need to be further *** these challenges,the recycled solid wastes hold immense potential in revolutionizing road construction

关键词： Road engineering Industrial solid waste Infrastructure solid waste Municipal life waste Recycled materials

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黄土高原题材油画研究--以丁方为例

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艺术科技 2024年第1期37卷 103-105,121页

作者：祝幸益江苏师范大学美术学院江苏徐州221116

目的:文章以专注于黄土高原创作的丁方为研究对象,研究其油画创作中图像选择的深意与技法创新,阐述其作品的内在精神特质和文化意图。方法:文章采用图像分析法、个案研究法、文献研究法、比较法等方法,梳理黄土高原油画发展情况。丁方... 详细信息

目的:文章以专注于黄土高原创作的丁方为研究对象,研究其油画创作中图像选择的深意与技法创新,阐述其作品的内在精神特质和文化意图。方法:文章采用图像分析法、个案研究法、文献研究法、比较法等方法,梳理黄土高原油画发展情况。丁方作为高原油画创作的先锋,文章从技法、题材、构图、用色等多方面分析其油画作品《城》系列、《剑形的意志》系列,并探讨丁方绘画作品中的悲剧性精神内核及文化意图。结果:丁方的艺术创作源于有根源性的精神文化涌动,从画面结构、叙事手法、选材偏好都可以看出其久远深厚的古典精神。其艺术是走在前沿的,表现出艺术创作者对“真、善、美”的高度追求,同时包含了对生命终极价值的独特理解。结论:基于丁方对时代的感受,从大地情愫、自我价值这两个方面分析其作品中的文化意图与当代意义。大地情愫与自我意识是密不可分的,黄土地及在高原上生长的生灵万物,是民族历史反思的起点,在赭石、土黄、炭黑杂糅的粗粝土地中,深蕴着自我感知与力量的进现。丁方将黄土高原坚厚的意志及人文关怀用综合材料的反复方式表现,重塑了“天人合一”的哲思,为中国艺术界增添了一抹亮色,使黄土高原成为毋庸置疑的华夏精神载体。

关键词：黄土高原油画丁方

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2018—2022年贵阳市某高校大学生体检肝功能结果分析

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中国校医 2024年第3期38卷 165-167页

作者：朱星一张伟贵州大学医院

目的了解近年贵阳市某高校大学生体检肝功能结果及肝炎病毒标志物检测情况，为该校学生肝功能异常及肝炎预防保健工作提供科学依据。方法对贵阳市某高校2018—2022年本科新生与毕业生体检肝功能[含血清丙氨酸氨基转移酶（ALT）和天门... 详细信息

目的了解近年贵阳市某高校大学生体检肝功能结果及肝炎病毒标志物检测情况，为该校学生肝功能异常及肝炎预防保健工作提供科学依据。方法对贵阳市某高校2018—2022年本科新生与毕业生体检肝功能[含血清丙氨酸氨基转移酶（ALT）和天门冬氨酸氨基转移酶（AST）]资料用SPSS进行统计分析，转氨酶异常者进一步检查肝炎病毒标志物判断肝功能异常原因。结果该校本科毕业生体检肝功能异常比例（4.7%）较新生入学体检比例（3.5%）增加，差异具有统计学意义（χ2=73.512,P<0.001）；本科新生和毕业生肝功能异常复查中均未检测出HAV IgM抗体、HCV病毒抗体、HEV IgM抗体，本科毕业生HBsAg阳性检出比例（10.0%）较本科新生（7.3%）增加，差异具有统计学意义（χ2=6.666,P=0.010）。结论贵阳市某高校2018—2022年本科毕业生肝功能异常检出率高于新生，其中肝功能异常中HBsAg阳性检出率本科毕业生高于新生，需要重视和加强高校学生肝功能异常及肝炎管理和防控工作。

关键词：大学生转氨酶肝炎病毒标志物

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Synthesis and characterization of geopolymer from lunar regolith simulant based on natural volcanic scoria

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Chinese Journal of Aeronautics 2022年第1期35卷 144-159页

作者： Siqi ZHOU xingyi zhu Chenghong LU Feng LI School of Transportation Science and Engineering Beihang UniversityBeijing 100083China Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 200092China

In this study,a new GVS(Ground Volcanic Scoria)lunar regolith simulant was *** similarity between GVS and lunar soil was proved by comparison with Apollo lunar soil samples and other commercial lunar soil ***,GVS lunar regolith simulant was investigated as the source material for preparing geopolymer to produce building material for lunar colony *** study the possibility of preparing geopolymer from GVS lunar regolith simulant and the optimum activator formulation as well as the optimum curing conditions,alkaline activated GVS slurries with different mixing ratios based on an orthogonal test scheme were *** geopolymer products based on GVS were characterized by flexural strength test,compressive strength test,X-ray fluorescence(XRF),X-ray diffraction(XRD),Fourier Transform Infrared Spectroscopy(FTIR),Scanning Electron Microscope coupled with Energy Dispersive Spectroscopy(SEM-EDS),29Si magic angle spinning-nuclear magnetic resonance(29Si MAS-NMR),and 27Al *** experimental results indicate that changes in the mass ratio of sodium hydroxide and GVS and curing temperature have the most significant influence on the flexural strength and compressive strength,*** GVS-based geopolymer can obtain the highest 28-day compressive strength and 28-day flexural strength up to 75.6 MPa and 6.3 *** results imply that the changes of Si occurring in a variety of environments that explaining preliminarily about the reaction mechanism of GVS-based *** study approves the feasibility of making a geopolymer derived from the GVS lunar regolith simulant and the potential utilization of geopolymer based on lunar regolith for construction of the lunar colony in future space exploration.

关键词： Geopolymer Lunar regolith simulant Mechanical properties Microstructure Moon colony Volcanic scoria

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Printability and hardening performance of three-dimensionally-printed geopolymer based on lunar regolith simulant for automated construction of lunar infrastructure

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Frontiers of Structural and Civil Engineering 2023年第10期17卷 1535-1553页

作者： Feng LI Rongrong ZHANG Siqi ZHOU xingyi zhu School of Transportation Science and Engineering Beihang UniversityBeijing 100083China Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 200092China

Using an in situ lunar regolith as a construction material in combination with 3D printing not only reduces the weight of materials carried from the Earth but also improves the automation of lunar infrastructure *** study aims to improve the printability of a geopolymer based on a BH-1 lunar regolith simulant,including the extrudability,open time,and buildability,by controlling the temperature and adding *** parameters were used to represent printability with different water-to-binder ratios,printing temperatures,and contents of *** mechanical properties of the hardening geopolymer with different filling paths and loading directions were *** results show that heating the printed filaments with a water-to-binder ratio of 0.32 at 80°C can adjust the printability without adding any additive,which can reduce the construction cost of lunar *** printability of the BH-1 geopolymer can also be improved by adding 0.3%Attagel-50 and 0.5%polypropylene fiber by mass at a temperature of 20℃to cope with the changeable environmental conditions on the *** curing under a simulated lunar environment,the 72-h flexural and compressive strengths of the geopolymer specimens reach 4.1 and 48.1 MPa,respectively,which are promising considering that the acceleration of gravity on the Moon is 1/6 of that on the Earth.

关键词： geopolymer lunar regolith simulant 3D printing rheology printability

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Preparation and Characterization of High-Strength Geopolymer Based on BH-1 Lunar Soil Simulant with Low Alkali Content

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Engineering 2021年第11期7卷 1631-1645页

作者： Siqi Zhou Chenghong Lu xingyi zhu Feng Li School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 200092China

The construction of a lunar base and habitation on the Moon has always been on researchers’*** materials used in in situ lunar resources are of great significance for saving expensive space *** this study,a new type of lunar soil simulant named Beihang(BH)-1 was *** chemical mineral composition and microstructure of BH-1 closely resemble those of real lunar soil,as verified by X-ray fluorescence spectroscopy(XRF),X-ray diffraction(XRD),scanning electron microscopy(SEM),and reflectance *** research also synthesized a geopolymer based on BH-1 cured at simulated lunar atmospheric *** also investigated the effect of supplementing aluminum(Al)sources on the enhancement of geopolymer strength based on *** rheological behavior of alkali-activated BH-1 pastes was determined for ***,XRD,Fourier transform infrared spectroscopy,SEM coupled with energy dispersive spectroscopy,and 27Al magic angle spinningnuclear magnetic resonance were used to characterize resulting *** test findings showed that the rheology of BH-1 pastes fits the Herschel–Bulkley model,and they behaved like a shear-thinning *** results showed that the 28-day compressive strength of the BH-1 geopolymer was improved by up to 100.8%.Meanwhile,the weight of additives required to produce per unit strength decreased,significantly reducing the mass of materials transported from the Earth for the construction of lunar infrastructure and saving space transportation *** analyses showed that the mechanism to improve the mechanical properties of the BH-1 geopolymer by adding an additional Al source enhances the replacement of silicon atoms by Al atoms in the silicon–oxygen group and generates a more complete and dense amorphous gel structure.

关键词： Space exploration Lunar base Geopolymer Lunar soil simulant Rheology

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Fast multipole boundary element analysis of 2D viscoelastic composites with imperfect interfaces

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Science China(Technological Sciences) 2010年第8期53卷 2160-2171页

作者： zhu xingyi CHEN WeiQiu HUANG ZhiYi LIU YiJun Department of Civil Engineering Zhejiang UniversityZijingang CampusHangzhou 310058China Department of Engineering Mechanics Zhejiang UniversityYuquan CampusHangzhou 310027China Department of Mechanical Engineering University of CincinnatiCincinnatiOhio 45221-0072USA

A fast multipole boundary element method(FMBEM)is developed for the analysis of 2D linear viscoelastic composites with imperfect viscoelastic *** transformed fast multipole formulations are established using the time domain method. To simulate the viscoelastic behavior of imperfect interfaces that are frequently encountered in practice,the Kelvin type model is *** FMBEM is further improved by incorporating naturally the interaction among inclusions as well as eliminating the phenomenon of material *** all the integrals are evaluated analytically,high accuracy and fast convergence of the numerical scheme are *** numerical examples,including planar viscoelastic composites with a single inclusion or randomly distributed multi-inclusions are *** numerical results are compared with the developed analytical solutions,which illustrates that the proposed FMBEM is very efficient in determining the macroscopic viscoelastic behavior of the particle-reinforced composites with the presence of imperfect *** laboratory measurements of the mixture creep compliance of asphalt concrete are also compared with the prediction by the developed model.

关键词： boundary element method fast multipole method viscoelasticity imperfect interface multi-inclusion composite

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Waterbomb-origami inspired triboelectric nanogenerator for smart pavement-integrated traffic monitoring

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Nano Research 2022年第6期15卷 5450-5460页

作者： Yafeng Pang xingyi zhu Ying Yu Shuainian Liu Yu Chen Yi Feng Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 200092China Department of Civil and Environmental Engineering Shantou UniversityShantou 515063China School of Mechanical Engineering Tongji UniversityShanghai 200092China College of Electronic and Information Engineering Tongji UniversityShanghai 200092China

With a rapid development of intelligent transportation systems(ITSs),traffic monitoring has gained increasing ***,we present a new kind of waterbomb-origami-inspired triboelectric nanogenerator(WO-TENG)as a traffic monitoring system to integrate smart pavement with lightweight,cost-effective,excellent deformability,flexibility,and self-rebounding *** electrical performance is significantly improved by more than 67%compared with current origami-based TENG,and multi tribo-pairs have great *** fully-packaged self-driven WO-TENG is further developed to integrate smart pavement,which can successfully decouple the influence of vehicle speed and weight on the sensing *** phenomenon demonstrates the feasibility and stability of the WO-TENG for traffic *** of the voltage amplitude and time interval electrical wave,vehicle speed,number of vehicles,and types of vehicles can be further evaluated *** work can not only address the challenge of traditional traffic monitoring system,but also promote the development of TENG based self-powered sensors in ITSs.

关键词： waterbomb-origami triboelectric nanogenerator smart pavement traffic monitoring

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结构沥青和自由沥青分离实验装置的研发

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中国现代教育装备 2024年第1期 80-83页

作者：孙艳娜朱兴一孙大权洪玲同济大学道路与交通工程教育部重点实验室上海201804

结构沥青和自由沥青侧重于理论教学,而未开设相应的实验课程,原因在于缺乏结构沥青和自由沥青分离的实验装置。研发了一套结构沥青和自由沥青分离实验装置,通过逐层洗脱的方法得到结构沥青和自由沥青,将理论教学中的概念知识转化为可操... 详细信息

结构沥青和自由沥青侧重于理论教学,而未开设相应的实验课程,原因在于缺乏结构沥青和自由沥青分离的实验装置。研发了一套结构沥青和自由沥青分离实验装置,通过逐层洗脱的方法得到结构沥青和自由沥青,将理论教学中的概念知识转化为可操作的实体实验,加深学生对沥青材料的理解。对比分析结构沥青和自由沥青的模量性能差异,确定了结构沥青膜厚度,为沥青混合料配合比设计提供参考和指导。经过实验课程检验,验证了该实验装置具有较好的稳定性和可行性。

关键词：实验装置实验教学结构沥青自由沥青

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