检索结果-南通市图书馆

An intuitive parameterization method with inherently high-order differentiability for co.pressor blade sections based on ellipse hierarchical deformation

引用

Chinese Journal of Aeronautics 2023年第8期36卷 74-90页

作者： Chuanrui SI Jinxin CHENG Zhengqing ZHU Zhitong CHEN Qinglong HAO School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China zaozhuang beihang machine tool innovation research institute co. LtdZaozhuang 277500China Ningbo institute of Technology Beihang UniversityNingbo 315832China

Shape parameterization has a crucial influence on the optimal solution of aerodynamic *** paper proposes a novel parameterization method for co.pressor blade sections based on the three-level deformation of the ellipse,which simultaneously satisfies the requirements of flexibility,smoothness,intuitiveness,and *** proposed method,the first-level deformation directly co.trols nine key geometric parameters to co.struct the blade section profile,and then the seco.d-and third-level deformations are performed respectively to co.rsely and finely modify the profile while keeping the key geometric parameters *** three levels of deformation effectively deco.pose the design space without destroying the ellipse’s infinite differentiability,allowing designers to work only with intuitive shape-related parameters to design blade sections with inherently high-order *** verify the effectiveness,six existing blade sections are first fitted and then one of them is selected for a three-level *** results show that the geometry and aerodynamic performance of the fitted and the original blade sections are in good agreement,and the loss co.fficient of the optimized blade section is reduced by a total of 36.41%,with 27.34%,8.45%,and 0.62%reductions for the first to the third level,***,the proposed parameterization method facilitates the design of lower-loss and higher-load co.pressor blade sections.

关键词： Aerodynamics Blade sections co.pressors Deformation Ellipse Parameterization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A review of modeling,simulation,and co.trol technologies of altitude ground test facilities for co.trol application

引用

Chinese Journal of Aeronautics 2023年第9期36卷 38-62页

作者： Xitong PEI Xi WANG Jiashuai LIU Meiyin ZHU Zhihong DAN Ai HE Keqiang MIAO Louyue ZHANG Zheng XU research institute of Aero-Engine Beihang UniversityBeijing 100191China Science and Technology on Altitude Simulation Laboratory AECC Sichuan Gas Turbine EstablishmentMianyang 621703China School of Energy and Power Engineering Beihang UniversityBeijing 100191China beihang Hangzhou innovation institute Yuhang Hangzhou 310023China institute for Aero Engine Tsinghua UniversityBeijing 100084China institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China

As the pivotal test equipment of aero-engines design,finalization,improvement,modification,etc.,the Altitude Ground Test Facilities(AGTF)plays an important role in the research and development of the *** the rapid development of advanced high-performance aeroengine,the increasing demand of high-altitude simulation test is driving AGTF to improve its test ability and level of automation and *** modeling method,simulation tool,and co.trol technology are the key factors to support the improvement of the AGTF co.trol *** main purpose of this paper is to provide an overview of modeling methods,simulation tools,and co.trol technologies in AGTF co.trol system for future ***,it reviews the evolution of AGTF in the world,from the early formative stage to integration ***,the mathematical modeling method of AGTF for co.trol application is ***,the simulation tools used in the AGTF co.trol system are overviewed from numerical simulation to hardware-in-loop simulation and further to semi-physical ***,the co.trol technologies used in the AGTF co.trol system are summarized from single-variable co.trol to multivariable integrated co.trol,and from classical co.trol theory to modern co.trol ***,reco.mendations for future research are ***,this review article provides extensive literature information for the modeling,simulation,and co.trol design of AGTF for co.trol application.

关键词： Altitude ground test facilities co.trol system Modeling and simulation Robust co.trol Temperature and pressure co.trol

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Deco.ple charge transfer reactions in the Li-ion battery

引用

Journal of Energy Chemistry 2024年第5期92卷 759-798页

作者： Yuxuan Bai Qiu-An Huang Kai Wu Jiujun Zhang institute for Sustainable Energy/co.lege of Sciences Shanghai UniversityShanghai 200444China Ningde co.temporary innovation Laboratory Contemporary Amperex Technology Co.LimitedNingde 352100FujianChina

In the development of Li-ion batteries(LIBs)with high energy/power density,long cycle-life,fast charging,and high safety,an insight into charge transfer reactions is *** electrochemical impedance spectrosco.y(EIS)is regarded as a powerful diagnosis tool,it is not a direct but an indirect *** respect to this,some critical questions need to be answered:(i)why EIS can reflect the kinetics of charge transfer reactions;(ii)what the inherent logical relationship between impedance models under different physical scenes is;(iii)how charge transfer reactions co.pete with each other at multiple *** work aims at answering these questions via developing a theory framework so as to mitigate the blindness and uncertainty in unveiling charge transfer reactions in *** systematically answer the above questions,this article is organized into a three-in-one(review,tutorial,and research)type and the following co.tributions are made:(i)a brief review is given for impedance model development of the LIBs over the past half century;(ii)an open source co.e toolbox is developed based on the unified impedance model;(iii)the co.petive mechanisms of charge transfer reactions are unveiled based on the developed EIS-toolbox@*** work not only clarifies theoretical fundamentals,but also provides an easy-to-use open source co.e for EIS-toolbox@LIB to optimize fast charge/discharge,mitigate cycle aging,and improve energy/power density.

关键词： Electrochemical impedance spectrosco.y Unified impedance model Charge transfer reactions Solid/electrolyte diffusion Porous electrode EIS-toolbox@LIB

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of TiC addition on the microstructure and wear resistance of induction brazed nickel-based co.ting in air

引用

China Welding 2022年第4期31卷 1-6页

作者： Long Weimin Sun Huawei Liu Dashuang Qin Jian Zhang Lei Lu Hongbo China Academy of machinery Ningbo Academy of Intelligent machine tool co. Ltd.Ningbo 315700China State Key Laboratory of Advanced Brazing Filler Metals and Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou 450001China School of Material Science and Engineering Hefei University of TechnologyHefei 230009China Zhengzhou Dingsheng Advanced Engineering Technology co. LtdZhengzhou 450001China

The nickel-based co.ting with different TiC addition was fabricated onto 45 steel substrate by using induction brazed technology in *** effect of TiC addition on the microstructure and wear resistance of induction brazing co.ting was *** results show that the microstructure of brazing co.ting is strengthened and refined by adding *** the increase of the amount of TiC added,the amount of TiC in the Ni-based matrix is increased,and the matrix structure is obviously *** is because the high melting point TiC particles can be used as heterogeneous nucleation co.es,thus refining the Ni based matrix ***,the wear resistance of brazing co.ting is improved due to the addition of TiC.

关键词： induction brazing nickel-based co.ting TiC

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

research on the heat co.duction mechanism of induction brazeco.ting

引用

China Welding 2023年第1期32卷 1-6页

作者：龙伟民王梦凡刘大双张雷张冠星王鑫华王水庆 China Academy of machinery Ningbo Academy of Intelligent machine tool co. Ltd.Ningbo 315700China State Key Laboratory of Advanced Brazing Filler Metals and Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou 450001China School of Material Science and Engineering Hefei University of TechnologyHefei 230009China Zhejiang Xinrui Welding Technology co. Ltd.Shaoxing 312000China

Induction brazeco.ting technology is an important means to improve the surface properties of *** this paper,co.per plate and co.undum are selected as substrates for induction brazeco.ting *** temperature variation of powder and paste co.ting is systematically studied,and the heat co.duction mode and path in the brazeco.ting process are *** results show that rise of the co.ting temperature mainly depends on the heat absorption from the *** liquid-solid interface co.ducts heat violently and advances step by step,which promotes the melting spread of metal filler *** powdery brazeco.ting material is in a free state,and there is a gas insulation film between the powder particles and the diamond,making it difficult for substrate to co.duct heat to the *** binder not only assists forming,shell making and oxygen isolation,but also plays an important role during melting.

关键词： induction brazing heat co.duction eddy heat generation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ph_3P^+CF_2co.2^- as an F^- and:CF_2 source for trifluoromethylthiolation of alkyl halides

引用

Chinese Chemical Letters 2019年第3期30卷 714-716页

作者： Zhuo Liu Jin Long Xuan Xiao Jin-Hong Lin Xing Zheng Ji-Chang Xiao Yu-Cai Cao institute of Pharmacy and Pharmaco.ogy Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study University of South China Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences Shanghai research institute of Chemical Industry co. LTD.

As trifluoromethylthiolation has received increasing attention recently, many CF_3S-reagents and trifluoromethylthiolation methods have been developed. Herein we describe trifluoromethylthiolation of alkyl halides by using Ph_3 P^+CF_2co.2 as a fluoride and difluorocarbene source. Difluorocarbene is a versatile intermediate, but its side reactions are usually ignored and the by-products would therefore be discarded. In this work, a side reaction of difluorocarbene, the generation of a fluoride anion from difluorocarbene, was developed into a synthetic tool. Although the trifluoromethylthiolation reaction involved multi-sequential steps, the cleavage of C-F bond, the formation of CF_2=S bond, F-C(S)F_2 bond,and C-SCF_3 bond, the co.version proceeded fast and was co.pleted within 10 min.

关键词： Difluorocarbene Trifluoromethylthiolation Alkyl halides Thiocarbonyl fluoride Fluorine

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Inter-co.parisons of VOC oxidation mechanisms based on box model:A focus on OH reactivity

引用

Journal of Environmental Sciences 2022年第4期34卷 286-296页

作者： Xiaoyun Yang Bin Yuan Zhe Peng Yuwen Peng Caihong Wu Suxia Yang Jin Li Min Shao institute for Environmental and Climate research Jinan UniversityGuangzhou 511443China Guangdong-Hongkong-Macao Joint Laboratory of co.laborative innovation for Environmental Quality Guangzhou 511443China Department of Chemistry and co.perative institute for research in Environmental Sciences University of ColoradoBoulderCO 80309USA

Volatile organic co.pounds(VOCs)oxidation processes play a very important role in atmospheric chemistry,and the chemical reactions are expressed in various manners in chemical *** gain an improved understanding of VOCs evolution during oxidation processes and evaluate the discrepancies of VOCs oxidation schemes among different mechanisms,we used the total VOC reactivity as a diagnostic and evaluated tool to explore the differences for six widely used chemical *** co.pared the total VOC reactivity evolution under high-NO_(x)xco.ditions for several sets of precursors,including n-pentane,toluene,ethene,isoprene and a mixture of 57 Photochemical Assessment Monitoring Stations(PAMS)species in a 0-D photochemical box ***-co.parison of total VOC reactivity of individual precursor simulations showed discrepancies to different extent of the oxidation schemes among the studied mechanisms,which are mainly attributed to the different lumping approaches for organic *** PAMS simulation showed smaller discrepancy than individual precursor cases in terms of total VOC ***07 and RACM2 performances are found to better match the MCM for simulation of total VOC *** suggest that the performance in simulating seco.dary organic products,OH co.centrations and NO_(x)co.centrations are related to the OH reactivity discrepancies among various chemical *** in this study can be used in selection of chemical mechanisms to better model OH reactivity in different *** results in this study also provide directions to further improve the ability in modelling total VOC reactivity with the chemical mechanisms.

关键词： VOCs Box model Chemical mechanism Total VOC reactivity VOC oxidation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efflcient machining of a co.plex blisk channel using a disc cutter

引用

Chinese Journal of Aeronautics 2024年第1期37卷 414-437页

作者： Xiangyu LI Zhaoyu LI Dong HE Junxue REN Qian FENG Kai TANG Department of Mechanical and Aerospace Engineering Hong Kong University of Science and TechnologyHong Kong 999077China Key Laboratory of High Performance Manufacturing for Aero Engine(Northwestern Polytechnical University) Ministry of Industry and Information TechnologyXi’an 710072China Xi’an Sanhang Power Technology co. LtdXi’an 710000China HKUST Shenzhen-Hong Kong co.laborative innovation research institute FutianShenzhen 518057China HKUST Shenzhen research institute Shenzhen 518057China

For rough machining of a co.plex narrow cavity,e.g.,a co.plex blisk channel on an aero-engine,the typically used cutting tools are the slender cylindrical cutter and co.ical ***,as neither of the two is particularly suited for rough machining,wherein the main purpose is to remove a large volume as quickly as possible,the machining efficiency is low,especially when the part materials are of hard-to-cut types(e.g.,Titanium-alloy)for which it often takes days to rough machine a ***,disc machining provides a new and efficient roughing solution,since a disc cutter with a large radius enables a much larger cutting speed and thus a larger material removal ***,due to the large radius of the disc cutter,its potential co.lision with narrow and twisted channels beco.es a serious *** this paper,we propose a novel twophase approach for efficiently machining a co.plex narrow cavity workpiece using a disc-shaped cutter,i.e.,3+2-axis disc-slotting of the channel by multiple layers(rough machining)+five-axis disc-milling of the freeform channel side surfaces(semi-finish machining).Both simulation and physical cutting experiments are co.ducted to assess the effectiveness and advantages of the proposed *** experimental results show that,with respect to a same cusp-height threshold on the channel side surfaces,the total machining time of the tested part by the proposed method is about only 36%of that by the co.ventional approach of plunging-milling(for roughing)plus milling by a slender cylindrical cutter(for semi-finishing).

关键词： Blisk channel CNC machining Disc cutter Roughing efficiency tool path planning

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influences of tool plunge speed and tool plunge depth on friction spot joining of AA5454-O aluminum alloy plates with different thicknesses

引用

中国有色金属学会会刊：英文版 2012年第S3期22卷 629-633页

作者： Sung-Ook YOON Myoung-Soo KANG Yong-Jai KWON Sung-Tae HONG Dong-Hwan PARK Kwang-Hak LEE Chang-Yong LIM Jong-Dock SEO School of Materials Science and Engineering University of Ulsan School of Mechanical Engineering University of Ulsan institute of E-Vehicle Technology University of Ulsan Technical research Laboratories Shin Young Co.Ltd.

AA5454-O aluminum alloy plates with the thicknesses of 1.4 and 1.0 mm were friction-spot-joined (FSJed).The plunge speed of the joining tool was changed in a range of 100 500 mm/min under a co.stant rotation speed of 500 r/*** plunge depth was ranged from 1.6 mm to 2.2 *** tool plunge speed did not make a remarkable effect on the surface appearance and macro-structure of the FSJed *** average hardness of the FSJed zone was greater than or equal to that of the base ***,there was no remarkable tendency in the average hardness change of the FSJed zone in spite of the variation in the tool plunge speed and tool plunge *** increase of the tool plunge depth resulted in the increase of the tensile shear ***,the change of the tool plunge speed did not lead to the remarkable variation in the tensile shear load of the FSJed *** was noteworthy that the FSJed plate exhibited the highest tensile shear load of about 4.0 kN.

关键词： friction spot joining AA5454-O aluminum alloy plunge speed plunge depth mechanical property

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mobile power generation system based on biomass gasifcation

引用

International Journal of co.l Science & Technology 2022年第3期9卷 171-184页

作者： Lu Ding Mingming Yang Kai Dong Dai‑Viet N.Vo Douglas Hungwe Jiahan Ye Alexander Ryzhkov Kunio Yoshikawa institute of Clean co.l Technology East China University of Science and TechnologyShanghai 200237China Department of Environmental Science and Technology Tokyo Institute of Technology4259 Nagatsuta-choMidori-kuYokohama 226-8503Japan co.lege of Chemistry Chemical Engineering and Material ScienceZaozhuang UniversityZaozhuang 277160China institute of Environmental Technology and Sustainable Development Nguyen Tat Thanh UniversityHo Chi Minh City 755414Vietnam ZHE JIANG Eco.ENVIRONMENTAL TECHNOLOGY co. LTD.1188The Headquarters of the Free Port H Building 20FWuxing DistrictHuzhou CityZhejiang ProvinceChina Ural Federal University EkaterinburgRussia

Disaster-hit and/or un-electrifed remote areas usually have electricity accessibility issues and an abundance of plant-derived debris and wood from destroyed wooden structures;this can be potentially addressed by employing a decentralized ultrasmall biomass-fed gasifcation power generating *** paper presents an assessment of the technical viability of an ultra-small gasifcation system that utilizes densifed carbonized wood pellets/*** setup was run co.tinuously for 100 h.A variety of biomass was densifed and carbonized by harnessing fugitive heat sources before charging into the *** briquettes and furnished blends exhibited inferior gasifcation performance co.pared to the carbonized *** the absence of tar blockage problems,steady-state co.ditions were achieved when pre-treated feedstock was *** steady-state co.ditions for carbonized pellets gasifcation operated at an equivalence ratio of 0.32,co.d gas efciency and carbon co.version achieved 49.2%and 70.5%,*** efciency and maximum power output of 20.3%and 21 kW were realised,*** was found that the system co.ld keep stable while the low heating valve of syngas was over 4 MJ/m^(3)on co.dition that avoiding tar blocking *** results indicate that the proposed co.pact ultra-small power generation system is a technically feasible approach to remedy power shortage *** addition,process simulation co.sidering carbonized wood gasifcation co.bined power generation was formulated to produce syngas and *** pellets with the fow rate of 20 kg/h co.ld generate a 15.18 kW power at the air fow rate of 40 Nm^(3)/h,which is in a good agreement with 15 kW in the 100 h *** is indicated that the gasifcation co.bined power generation cycle simulated by Aspen simulator co.ld achieve reliable data to assist the co.plicated experiment operation.

关键词： Small-scale power generation Densifcation Carbonized pellet Carbonized briquette Gasifcation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：