检索结果-南通市图书馆

Theory Analysis and Experiment Investigation of Laser Shock processing on Titanium Alloy Blade

在线全文

cnki会议

学校读者我要写书评

暂无评论

稀有金属材料与工程 2011年第S4期40卷 235-239页

作者： Che Zhigang1,Gong Shuili1,Cao Ziwen1,Zou Shikun1,Gao Yu2,Ma He1 1Laboratory of Science and Technology on power Beam processes,Beijing aeronautical Manufacturing Technology research Institute,Bei-jing 100024,china 2shenyang liming aero-engine group corporation Ltd.,shenyang 110043,china Beijing aeronaut Mfg Technol res Inst Lab Sci & Technol Power Beam Proc Beijing 100024 Peoples R China shenyang liming aeroengine Grp Corp Ltd Shenyang 110043 Peoples R China

Laser shock processing (LSp) is an effective surface treatment technology to increase the resistance of metallic components to high-cycle fatigue (HCF),stress corrosion cracking (SCC),wear,etc.,through imparting compressive residual stress on the *** requirement for aeroengine blade treatment and the principle of LSp were introduced at the beginning of this *** key theories and technologies for LSp were analyzed,including improving the pressure model and introducing the technique of eliminating wave reflection at the back of blade during *** nanocrystallation of titanium alloy surface was realized for the first time using the method of laser shocking at the same time no impurity particles were *** treating one kind of aeroengine blade using LSp,the technology parameters were *** nature frequency,fatigue life and residual stress were *** results showed the blade performance was improved obviously,which established the theory and experiment base of laser shock processing on blisk.

关键词： laser shock processing pressure model nanocrystallation natural frequency titanium alloy

Degradation of EB-pVD thermal barrier coatings caused by CMAS deposits

在线全文

学校读者我要写书评

暂无评论

progress in Natural Science:Materials International 2012年第5期22卷 461-467页

作者： Hui peng a,Lu Wang a,b,Lei Guo a,Wenhui Miao a,Hongbo Guo a,Shengkai Gong a a School of Materials Science and engineering,Beihang University,No.37,Xueyuan road,Beijing 100191,china b AVIC shenyang liming aero-engine group corporation Ltd.,shenyang 110043,china School of Materials Science and engineering Beihang University No.37 Xueyuan Road Beijing 100191 China AVIC shenyang liming aero-engine group corporation Ltd. Shenyang 110043 China

In aero-turbine engines,thermal barrier coatings(TBCs) must be capable to withstand harsh environments,such as high-temperature oxidation and ***,a new failure mode of TBCs caused by calcium-magnesium-alumina-silicate(CMAS) glass has attracted increasing *** this paper,yttria stabilized zirconia(YSZ) TBCs produced by electron beam physical vapor deposition(EB-pVD) were exposed to CMAS deposits at 1250℃.The microstructure evolution and failure mechanism of the coatings were *** has been shown that CMAS glass penetrated into the YSZ ceramic layer along the inter-columnar gaps and interacted with *** a result,an interaction zone of about 20μm thickness,which was the mixture of CMAS and YSZ with equiaxial structure,was formed in the YSZ surface layer after 4h heat-treatment at 1250℃.Meanwhile,yttria in YSZ layer as a stabilizer was dissolved in CMAS glass and caused accelerated monoclinic phase *** 8h heat-treatment,degradation of YSZ TBC occurred by delamination cracking of YSZ layer,which is quite different from the traditional failure caused by interfacial cracking at the YSZ/metallic bond *** models have been built to describe the failure mechanism of EB-pVD TBCs attacked by CMAS deposits.

关键词： Thermal barrier coatings(TBCs) Electron beam-physical vapor deposition(EBpVD) Calcium-magnesium-alumina-silicate(CMAS) Failure mechanism

The Coupled FEM Analysis of Transient Temperature Field During Inertia Friction Welding of GH4169 Alloy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Coupled FEM Analysis of Transient Temperature Field Duri...

The Fourth International Conference on physical and Numerical Simulation of Materials (ICpNS’2004)

作者： Liwen ZHANG Chengdong LIU Shaoan QI Yongsi YU Wenhui ZHU ShenQU and Jing WANGDepartment of Materials engineering of Dalian University of Technology Dalian 116023 chinaShengYang liming aero-engine group corporation shenyang china

＜正＞The inertia friction welding process is a non-linear process because of the interaction between temperature field and material properties as well as the friction force. A thermo-mechanical coupled finite element model is established to simulate the temperature field of this process. The transient temperature distribution during the inertia friction welding process of two similar workpieces of GH4169 alloy is calculated. The region of the circular cross-section of workpiece is divided into a number of four-nodded isoparametric elements, In this model, we considered the temperature dependent thermal properties, time dependent heat inputs, contact condition of welding interface and deformation of the flash. At the same time, the convection and radiation heat losses at the surface of workpieces are also considered. A temperature data acquisition system was developed. The temperature at some position near the welding interface was measured by this system. The calculated temperature agrees well with the experimental data. The deformation of the flash and the factor affecting the temperature distribution at the welding interface are also discussed.

关键词： Inertia friction welding Temperature field numerical simulation Finite element method

NUMErICAL SIMULATION OF FOrGING prOCESS OF A GAS TUrBINE STATOr BLADE

在线全文

cnki会议

学校读者我要写书评

暂无评论

NUMERICAL SIMULATION OF FORGING PROCESS OF A GAS TURBINE STA...

第七届海内外青年设计与制造科学会议

作者： Lv Cheng Zhang Liwen Wang Zhaokun and Zheng Quying The State Key Laboratory for Materials Modification by Later Ion and Electron Beams china School of Materials Science and engineering Dalian University of Technology china shenyang liming aero-engine group corporation china

＜正＞In this paper, a three-dimentional analysis of the non-isothermal forging process of a gas turbine stator blade is presented, using 3D rigid-viscoplastic finite element method （FEM）. Based on the simulation results, the metal forming mechanisms of blade forging process are illuminated. It also shows the distributions of strain field, temperature field and the load-stroke relationships for each operational stage. Experimental studies were conducted to validate the FEM model. The result shows that the simulation results are in good agreement with experimental results in terms of geometrical changes as well as forging load. These results could provide theoretical guidance for process optimization of gas turbine stator blade forging process.

关键词： Gas turbine stator blade Forging Finite element method Simulation

FEM SIMULATION OF VACUUM HOT BULGE FOrMING prOCESS OF BT20 TITANIUM ALLOY CYLINDrICAL WOrKpIECE

在线全文

cnki会议

学校读者我要写书评

暂无评论

FEM SIMULATION OF VACUUM HOT BULGE FORMING PROCESS OF BT20 T...

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： WANG Mingwei*, ZHANG Liwen*, pEI Jibin*, LI Chenhui *State Key Laboratory for Materials Modification by Laser, Ion and Electron Beams, Dalian 116085, china School of Material Science and engineering, Dalian University of Technology, Dalian 116085, china shenyang liming aero-engine group corporation, shenyang 110043, china

Bulge forming is an innovative manufacturing process used to produce many industrial components. Components are bugled by restraining the blank in a die bearing the desired shape and applying an inter

关键词： BT20 titanium alloy vacuum hot bulge forming FEM numerical simulation.

在线全文

cnki会议

学校读者我要写书评

暂无评论

非全数据EV模型的参数辨识及可靠性分析

系统工程学报 2003年第6期18卷 506-510页

作者：王金玉姚忠东潘德惠东北大学工商管理学院沈阳黎明航空发动机集团公司沈阳110014

对于在测量系统(I)下分别测到n个数据值的n件产品,在测量系统(Ⅱ)下只测到其中的n1件产品,未测到的n2(n1+n2=n)件产品在使用了t1h后,需要在测量系统(Ⅱ)下做无替换定期检测,要求对这n2件产品作出可靠性分类,分类标准是与使用前相比其改... 详细信息

对于在测量系统(I)下分别测到n个数据值的n件产品,在测量系统(Ⅱ)下只测到其中的n1件产品,未测到的n2(n1+n2=n)件产品在使用了t1h后,需要在测量系统(Ⅱ)下做无替换定期检测,要求对这n2件产品作出可靠性分类,分类标准是与使用前相比其改变量不超过一个额定值.论文使用期望最大(EM)算法,对这种非全数据的变量含误差(EV)模型的参数给出了一种辨识方法.并给出了估计标准、错分概率及相应的错分代价.用此方法解决了某飞机发动机公司的高压涡轮叶片的寿命分析问题.

关键词：高压涡轮叶片参数辨识可靠性分析非全数据EV模型飞机发动机

在线全文

学校读者我要写书评

暂无评论

航空压气机叶片理论型面数学建模研究

计算机工程与应用 2004年第25期40卷 15-17页

作者：陈凯云叶佩青梁巧云清华大学精密仪器与机械学系北京100084 沈阳黎明航空发动机(集团)有限责任公司沈阳110043

提出了NUrBS节点因子法理论,研究了基于节点因子法的航空压气机叶片理论型面数学建模方法,通过实例分析,证明了该方法比传统方法更加精确可行。

关键词： NUrBS 叶片节点因子法数学建模

The Method of Neural Network pID Control with prediction Control

在线全文

学校读者我要写书评

暂无评论

The Method of Neural Network PID Control with Prediction Con...

2010 Chinese Control and Decision Conference

作者： Shengqi SUN~1,Xuebin LI~2,Liang DONG~(1,3),Shusheng GU~1 1.key laboratory of manufacturing industrial integrated automation,shenyang University,shenyang,110044,china 2.shenyang liming aero-Enging group corporation LTD.,shenyang,110043,china 3.College of Information Science and engineering,Northeastern University,shenyang,110004,china.

＜正＞This paper presents two improved training method for designing the weights of neural network pID controller, which use Clarke index function and multi-step quadratic index function to train the weights of the neural network pID *** it makes the character of the control system *** simulation results demonstrate the effectiveness of this method.

关键词： Neural network pID control Clarke’s index function Multi-step quadratic index function Train

Chinese Society of Cardiology guidelines on the diagnosis and treatment of adult fulminant myocarditis

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2024年第5期67卷 913-939页

作者： Chinese Society of Cardiology,Chinese Medical Association,Writing group Jiangang Jiang Hongyang Shu Dao Wen Wang rutai Hui Chenze Li Xiao ran Hong Wang Jing Zhang Shaoping Nie Guanglin Cui Dingcheng Xiang Qun Shao Shengyong Xu Discussion experts:Ning Zhou Yuming Li Wei Gao Yuguo Chen Yuan Bian Guoping Wang liming Xia Yan Wang Chunxia Zhao Zhiren Zhang Yuhua Zhao Jianan Wang Shaoliang Chen Hong Jiang Jing Chen Xianjin Du Mao Chen Yinxian Sun Sheng Li Hu Ding Xueping Ma Hesong Zeng Li Lin Shenghua Zhou Likun Ma Ling Tao Juan Chen Yiwu Zhou Xiaomei Guo 不详 Tongji Hospital Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Fuwai Hospital National Center for Cardiovascular DiseasesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100037China Zhongnan Hospital of Wuhan University Wuhan 430062China Fuwai Huazhong Cardiovascular Hospital Zhengzhou 450003China Beijing Anzhen Hospital Capital Medical UniversityBeijing 100029China Guangzhou General Hospital of Guangzhou Military Command Guangzhou 510010China Harbin Medical University Cancer Hospital Harbin 150081China Union Hospital Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Taida Hospital Tianjin 300457China peking University Third Hospital Beijing 100191China Qilu Hospital of Shandong University Jinan 250012China Kanghua Hospital DongguanGuangzhou 523080China Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou 310003China Nanjing First Hospital Nanjing Medical UniversityNanjing 210006China renmin Hospital of Wuhan University Wuhan 430060Wuhan West china Hospital Sichuan UniversityChengdu 610044China First Hospital of china Medical University Shenyang 110002China General Hospital of Ningxia Medical University Yinchuan 750003China The Second Xiangya Hospital Central South UniversityChangsha 410012China The First Affiliated Hospital of USTC University of Science and Technology of ChinaHefei 230002China The First Affiliated Hospital of Air Force Medical University Xi’an 710032China Central Hospital of Wuhan City Wuhan 430014China Tongji Medical College Huazhong University of Science and TechnologyWuhan 430030China

Fulminant myocarditis is an acute diffuse inflammatory disease of *** is characterized by acute onset,rapid progress and high risk of *** pathogenesis involves excessive immune activation of the innate immune system and formation of inflammatory *** to china’s practical experience,the adoption of the“life support-based comprehensive treatment regimen”(with mechanical circulation support and immunomodulation therapy as the core)can significantly improve the survival rate and long-term *** emphasis is placed on very early identification,very early diagnosis,very early prediction and very early treatment.

关键词： fulminant myocarditis guidelines life support-based comprehensive treatment regimen diagnosis treatment cytokine storm overactivation of immunity