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航空发动机叶片激光熔覆、数控加工和超声滚压复合再制造工艺链研究

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表面工程与再制造 2024年第2期24卷 49-49页

作者： Jiawei Liang[a] Dongbo Wu[a,b] Shibo Liu[a,d] Hui Wang[a,c] Jie Yu[e] [a]Department of Mechanical engineering Tsinghua University Beijing 100084 China [b]Institute for Aero engine Tsinghua University Beijing 100084 China [c]Research Institute of Aero-engine Beihang University Beijing 102206 China [d]School of Electrical engineering Xinjiang University Urumqi Xinjiang 830017 China [e]aecc Aviation POWER co. Ltd. Xi'an Shannxi 710021 China

航空发动机叶片的修复与再制造工艺在几何精度和力学性能上要求较高。因此,需要多种工艺的协同作用来完成叶片的修复工作。本文主要研究航空发动机叶片修复多道工序之间的耦合关系以及各道工序对叶片最终表面完整性的影响和作用。首先,... 详细信息

航空发动机叶片的修复与再制造工艺在几何精度和力学性能上要求较高。因此,需要多种工艺的协同作用来完成叶片的修复工作。本文主要研究航空发动机叶片修复多道工序之间的耦合关系以及各道工序对叶片最终表面完整性的影响和作用。首先,针对叶片修复的需求,提出了激光熔覆、数控加工和超声滚压的混合再制造工艺链。然后,建立了叶片混合再制造工艺链中几何特征构建与瞬态热-结构行为的数值模型。

关键词：航空发动机叶片激光熔覆表面完整性超声滚压数控加工几何精度再制造工艺修复工作

Bimodal TBCs with low thermal co.ductivity deposited by a powder-suspension co.spray process

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Journal of Materials Science & Technology 2018年第8期34卷 1293-1304页

作者： Wei-Wei Zhang Guang-Rong Li Qiang Zhang Guan-Jun Yang Guo-Wang Zhang Hong-Min Mu State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China School of Materials Science and engineering Chang'an UniversityXi'an 710064China Institute of Publication Science Chang'an UniversityXi'an 710064China aecc Beijing Institute of Aeronautical Material Beijing 100095China

Advanced thermal harrier co.tings （TBCs） with better thermal barrier performance are required by both advanced gas turbine and air engine. In this work, novel bimodal TBCs with low thermal co.ductivity were deposited and characterized by a novel co.spray approach with both solid powder and suspension. Experimental and finite element analyses were used to optimize the process parameters to prepare the specific morphology nanostructure features. With a co.prehensive understanding on the influence of spraying parameters on the morphology ofnano-particles, homogeneous nano-particle heaps with a large aspect ratio were introduced to co.ventional layered co.tings by plasma co.spraying with suspension and solid powder. co.sprayed bimodal microstructure co.posite co.tings resulted from both wet suspension droplets and molten particle droplets exhibited low thermal co.ductivity. The thermal co.ductivity of the co.posite co.ting was 1/5 lower than that of the co.nterpart co.tings by co.ventional plasma spraying with solid powder. This study sheds light to the structural tailoring towards the advanced TBCs with low thermal co.ductivity.

关键词： Thermal barrier co.tings Aspect ratioBimodal microstructure Thermal co.ductivity co.spray process

Establishment and Application of National 6 Heavy Duty Diesel Vehicle Virtual Testbed

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Establishment and Application of National 6 Heavy Duty Diese...

2023中国汽车工程学会年会暨展览会

作者： Lyu He Wang Mengyuan Li Jingyuan China Automotive Technology and Research Centre co. Ltd. CATARC Automotive Test Center (Tianjin) co. Ltd.

With the rapid development of electronic co.trol technology,virtual calibration has beco.e the main research direction in this field,and virtual testbed is more widely used in engine plants and vehicle *** this paper,based on the principle of hardware-in-the-loop test system and with the help of AVL simulation equipment,a virtual testbed for a National VI diesel vehicle is *** system is tested for universal characteristics and transient cycle WHTC test,and the results show that the average relative error of NO emission of the measurement system in the whole process of universal characteristics is 6.1%,and the relative error of NO emission accumulation in the whole process of world uniform transient cycle is 0.58%,which meets the requirements of accuracy and *** on this testbed,a test study was co.ducted on diesel vehicles under Chinese heavy truck cycle co.dition CHTC-HT and driving cycle C-WTVC with adjustment of acceleration（deceleration） speed based on world transient cycle co.dition WTVC for commercial vehicles,and the differences in the characteristics of the two cycles and the different performance of emissions and fuel co.sumption were co.pared and *** vehicle has a higher percentage of NO emissions in the medium and low speed stages,and poorer fuel eco.omy in the high speed stage.

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co.struction of Supplier Quality Prevention and Upgrading Mechanism Based on Game Theory

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Construction of Supplier Quality Prevention and Upgrading Me...

2023中国汽车工程学会年会暨展览会

作者： Wen Yong VOYAH Automobile Technology co. Ltd.

Our goal is to realize the transformation from a big automobile co.ntry to a powerful *** such a fierce market environment,in the co.plex and huge auto mobile supply chain system,out sourcing parts,with its unique position of acco.nting for more than 95% of the total vehicle parts,make the quality level of suppliers beco.e an important sign of the co.e co.petitiveness of the main engine ***,due to the commercial nature of suppliers to pursue the maximization of profits and the moral hazard of the lack of integrity of some people in society,suppliers have formed a game between the way of saving operating co.ts in disguised form of quality breach and the willingness of the main engine manufacturer to co.tinuously improve the quality of the whole vehicle and suppliers to meet customer *** this problem is also the only way to realize the transformation from a big automobile co.ntry to a powerful *** the perspective of quality breach of out sourced parts,co.bined with the current situation of Landtu Automobile co.,Ltd.,this paper analyzes and interprets the decision-making process and causes of the supplier default problem by establishing a game model between the supplier and Landtu Automobile co.,Ltd.,studies and explores the laws of the supply chain default risk problem and the measures to prevent the default risk,and determines the non-strategic dominant strategy of Landtu Automobile co.,*** on this *** establish the team co.peration mode and prevention and upgrading mechanism under the new situation,effectively curb the occurrence of supplier quality breach.

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Low Temperature PEMS Emission co.trol Study of commercial Vehicles

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Low Temperature PEMS Emission Control Study of Commercial Ve...

2021中国汽车工程学会年会暨展览会

作者： Dong Dalu Yu Qi Zhang Yi Tian Hongming Wang Zhen Wang Yupeng FAW Jiefang Truck co. Ltd.

In this paper,we studied the N3 commercial vehicles meet the China VI b *** vehicle at-7℃ low-temperature and light-load PEMS test,the engine of China Ⅳ a cannot achieve the China Ⅳ b standard *** N3 vehicles can meet the China Ⅳ b standard by improving engine exhaust heat management and optimizing original emission in *** exhaust temperature management can increase the engine WHTC exhaust average temperature by 25℃,the NOx emission decrease by 30% in part load,by the way the N3 class vehicle can achieve China Ⅳ b *** exhaust thermal management and EGR technology will be important for future emission regulatory requirements.

关键词： N3 class commercial vehicles diesel engine low-temperature PEMS exhaust thermal management China 6b

Real-Time co.optimization of Gear Shifting and engine Torque for Predictive Cruise co.trol of Heavy-Duty Trucks

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Chinese Journal of Mechanical engineering 2024年第2期37卷 294-317页

作者： Hongqing Chu Xiaoxiang Na Huan Liu Yuhai Wang Zhuo Yang Lin Zhang Hong Chen School of Automotive Studies Tongji UniversityShanghaiChina Department of engineering University of CambridgeCambridgeUK State Key Laboratory of Automotive Simulation and co.trol Jilin UniversityChangchunChina Qingdao Automotive Research Institute Jilin UniversityQingdaoChina Dongfeng commercial Vehicle Technology Center Dongfeng Motor CorporationWuhanChina

Fuel co.sumption is one of the main co.cerns for heavy-duty *** cruise co.trol(PCC)provides an intriguing opportunity to reduce fuel co.sumption by using the upco.ing road *** this study,a real-time implementable PCC,which simultaneously optimizes engine torque and gear shifting,is proposed for heavy-duty *** minimize fuel co.sumption,the problem of the PCC is formulated as a nonlinear model predictive co.trol(MPC),in which the upco.ing road elevation information is *** the solution of the nonlinear MPC is time co.suming;thus,a real-time implementable solver is developed based on Pontryagin’s maximum principle and indirect shooting *** programming(DP)algorithm,as a global optimization algorithm,is used as a performance benchmark for the proposed ***,hardware-in-the-loop and real-truck experiments are co.ducted to verify the performance of the proposed *** results demonstrate that the MPC-based solution performs nearly as well as the DP-based solution,with less than 1%deviation for testing ***,the proposed co.optimization co.troller is implementable in a real-truck,and the proposed MPC-based PCC algorithm achieves a fuel-saving rate of 7.9%without co.promising the truck’s travel time.

关键词： Heavy-duty truck Predictive cruise co.trol Model predictive co.trol Pontryagin’s maximum principle Real-truck implementation

Challenges for the Future Green Diesel with Uninterrupted Development of the Ultra High Pressure CRS

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Challenges for the Future Green Diesel with Uninterrupted De...

2011中国汽车工程学会年会

作者： Zenji Kuwabara Akikazu Kojima Nobuhiko Torigoe Liu Linhu Zou Long DENSO co.PORATION DENSO(China) Investiment co. Ltd Shanghai Technical Center

Medium and heavy duty commercial vehicles are playing important roles to support the present nation building and logistics in ***,emissions regulations as stringent as those for passenger cars are going to be implemented *** meet the regulations,it will be necessary to use co.plicated aftertreatment systems,which can cause disadvantages for the system including increased co.t and reduced fuel *** such an environment,DENSO,under the development policy "Diesel Revolution",has been developing attractive engine management systems with an aim of simplifying the total engine management system and improve fuel efficiency,which is the exact opposite to the general *** acco.plish this,DENSO worked to build a highly-sophisticated injection system which is capable of improving spray quality and co.trolling variation in injection quantity,which is an important factor,under the co.cept of minimizing engine-out emissions to reduce requirement for aftertreatment *** injection pressure and adding system co.trol to reduce variation,has enabled the DENSO engine management system to respond to "Green ＆ Eco. which will be introduced in global scale in the future.

关键词： DENSO diesel CRS high pressure injector pump regulation aftertreatment 3rd generation 4th generation

co.putational Studies of Urea-derived Deposits in a Close-co.pled SCRF System

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Computational Studies of Urea-derived Deposits in a Close-co...

2022中国汽车工程学会年会暨展览会

作者： Mo Qiutong Du Kun China Automotive engineering Research Institute co. Ltd. University of Bath

The close-co.pled selective catalytic reduction(SCR) system integrated with particulate filters(SCRF) has been widely adopted for light/heavy-duty vehicles due to its co.pactness and faster warm-up ***,the performances of the SCRF system are negatively affected by the unwanted growth of deposits formed from the injected urea water solution(UWS),especially under low load engine *** paper has developed a full 3 D co.putational Fluid Dynamics(CFD) model for a commercial close-co.pled SCRF system based on the fluid-solid co.pling *** CFD model was successfully validated by co.paring it with experimental results co.ducted under three diesel engine operating *** simulation results show that the area and thickness of wall film accumulated in the system are higher under a low exhaust mass flow *** high wall temperature,the deposition rate of UWS is lower than the case under lower wall ***,the temperature of wall film is increasingly higher under high wall temperature which leads to the formation of more thermally stable co.pounds such as CYA and *** low wall temperature,urea solid is found to be the main co.position generated from the wall film co.paring with other chemical *** simulation results co.ld be useful in providing some guidance for the design of SCRF system in terms of deposit reduction.

关键词：

Bench Test Modeling for Current and Future PCMO Fuel Eco.omy Requirements

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润滑油 2008年第1期23卷 55-61页

作者： Mark T. Devlin Cheng C. Kuo John M. Pietras Zhang Yun Afion Chemical co.poration Richmond Virginia USA Afion Chemical Trading （ Beijing ） co. Ltd. Beijing China

The automotive and lubricant industries have been placing increased emphasis on the fuel eco.omy benefits of today′s modern passenger car motor *** current ILSAC GF-4 specification has more stringent requirements than previous ILSAC specifications,and the proposed future ILSAC GF-5 specification is looking at further improvements in the lubricant′s fuel eco.omy *** address these needs,Afton Chemical has developed co.relations between the rheological and frictional properties of oils and fuel eco.omy measured in engine and field *** this paper we will present co.relations between lubricants′ physical properties and fuel eco.omy measured in vehicles and engine *** tools have been used to develop current commercial oils which are being used extensively to meet today′s OEM needs.

关键词：燃料经济性台架试验模型流变学摩擦力汽车机油