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Lightweight Design of co.mercial Vehicle Cab Based on Fatigue Durability

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co.puter Modeling in Engineering & Sciences 2023年第7期136卷 421-445页

作者： Donghai Li Jiawei Tian Shengwen Shi Shanchao Wang Jucai Deng Shuilong He School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin541004China dongfeng Liuzhou motor co. Ltd.Liuzhou545005China

To better improve the lightweight and fatigue durability performance of the tractor cab,a multi-objective lightweight design of the cab was carried out in this ***,the finite element model of the cab with co.nterweight loading was established and then co.firmed by the physical testing,and use the inertial reliefmethod to obtain stress distribution under unit *** cab-frame rigid-flexible co.plingmulti-body dynamicsmodelwas built by Adams/car *** the cab airbag mount displacement and acceleration signals acquired on the proving ground as the desired signals and obtaining the fatigue analysis load spectrum through Femfat-Lab virtual *** fatigue simulation analysis is performed in nco.e based on the Miner linear fatigue cumulative damage ***,with themass and fatigue damage values as the optimization objectives,the bending-torsional stiffness and first-order bending-torsional mode as co.straints,the thickness variables are screed based on the sensitivity *** experimental design was carried out using the Optimal Latin hypercube method,and the multi-objective optimal design of the cab was carried out using theKriging approximationmodel fitting and particle *** weight of the optimized cab is reduced by 7.8%on the basis of meeting the fatigue durability ***,a seven-axis road simulation test rig was designed to verify its fatigue *** results show the optimized cab can co.sider both lightweight and durability.

关键词： Finite element analysis multi-body dynamics fatigue durability analysis sensitivity analysis lightweight design particle swarm optimization

Optimization of Engine co.trol Strategies for Low Fuel co.sumption in Heavy-Duty co.mercial Vehicles

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co.puter Modeling in Engineering & Sciences 2023年第12期137卷 2693-2714页

作者： Shuilong He Yang Liu Shanchao Wang Liangying Hu Fei Xiao Chao Li School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin541004China Technology Center of co.mercial Vehicle Dongfeng Liuzhou Motor Co.Ltd.Liuzhou545005China

The reduction of fuel co.sumption in engines is always co.sidered of vital *** these lines,in this work,this goal was attained by optimizing the heavy-duty co.mercial vehicle engine co.trol *** specifically,at first,a general first principles model for heavy-duty co.mercial vehicles and a transient fuel co.sumptionmodel for heavy-duty co.mercial vehicles were developed and the parameters were adjusted to fit the empirical *** accuracy of the proposed modelwas demonstrated fromthe stage and the final ***,the co.trol optimization problem resulting in low fuel co.sumption in heavy co.mercial vehicles was described,with minimal fuel usage as the optimization goal and throttle opening as the co.trol ***,a time-co.tinuous engine management approach was ***,the factors that influence low fuel co.sumption in heavy-duty co.mercial vehicles were systematically *** reduce the co.puting co.plexity,the co.trol strategies related to the time co.straints of the engine were parametrized using three different *** most effective solution was obtained by applying a global optimization strategy because the co.strained optimization problem was ***,the effectiveness of the low-fuel co.sumption engine co.trol strategy was demonstrated by co.paring the simulated and field test results.

关键词： Fuel co.sumption heavy-duty co.mercial vehicle engine co.trol optimal co.trol

High cycle fatigue properties of die-cast magnesium alloy AZ91 D-1%MM

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中国有色金属学会会刊：英文版 2008年第A1期18卷 306-311页

作者：徐玉磊张奎李兴刚雷健杨院生罗天骄 State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Non-ferrous Metals dongfeng motor co. LTD Material Technology Institue of CVTC Institute of Metal Research Chinese Academy of Sciences

The high cycle fatigue properties of the die-cast magnesium alloy AZ91D co.taining 1%mischmetal(mass fraction) at a fatigue ratio of 0.1 were *** difference in the microstructure between the skin and co.e region of the die-cast magnesium alloy was analyzed by optical *** mechanical property tests indicate that the values of the tensile strength, elongation and hardness are 185 MPa,1.5%and HBS 70±3 at room temperature,*** p-S-N curve(p=50%) of the die-cast magnesium alloy AZ91D-1%MM is determined and the mean fatigue strength co.responding to 3.8×10~5 cycles is 70 MPa. A linear relation between S and N_p in log scale between 10~3 and 10~6 cycles is written with a *** mechanical properties are influenced by the casting *** fatigue life of the samples with minor defects is near to the upper limit of the fatigue life data. The fatigue fracture surface of the samples with minor defects possesses the mixed characteristics of quasi-cleavage,lacerated ridge and dimple and it is brittle fracture mode as a whole.

关键词：镁合金 AZ91D合金高温合金疲劳行为

Development and Application of Universal Formability Technology

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Journal of Materials Science & Technology 2001年第4期17卷 471-472页

作者： Yanwu Xu Ford motor co.pany,USA Ford motor co. Detroit Michigan United States

Using mathematical plasticity theories, universal formability (UF) technology has been developed and applied in the automotive stamping engineering and production. As a formability analysis tool, this technology is the major methodology for the development of stamping expert system (solution provider) for (a) product design and feasibility analysis, (b) material automatic selection using nomograms, (c) draw die design using pre-models, and (d) UF and robustness analysis of die performance in finite element analysis (FEA) environment.

关键词： Development and Application of Universal Formability Technology mode

Effect of mischmetal on mechanical properties and microstructure of die-cast magnesium alloy AZ91D

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Journal of Rare Earths 2016年第7期34卷 742-746页

作者：徐玉磊张奎雷健 School of Materials and Metallurgy Inner Mongolia University of Science and Technology State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Nonferrous Metals Material Technology Institute of BVTC DongFeng Motor Co.Ltd.

Effects of the mischmetal addition in range of 0.4 wt.% to 1.7 wt.% on the microstructure and mechanical properties of die-cast magnesium AZ91D were investigated to improve the elevated temperature mechanical properties of the alloy by scanning electron microsco.y, transmission electron microsco.y, X-ray diffraction and tensile tests. The results revealed that mechanical prop- erties of die-cast magnesium alloy AZ91D-0.4%MM at 100 ℃ were near to those of die-cast magnesium alloy AZ9 ID. The ultimate tensile strength, 0.2% proof yield strength and elongation to failure of die-cast magnesium alloy AZ91D at 170 ℃ were 178, 129 MPa and 20%, respectively. In co.parison, the ultimate tensile strength, 0.2% proof yield strength and elongation to faihtre of die-cast magnesium alloy AZ91D-0.4%MM at 170℃reached to 206, 142 MPa and 26%, respectively increased by 15.7%, 10% and 30%. Proper addition of mischmetal co.ld enhance the mechanical properties at an elevated temperature, which was attributed to the formation of A1-RE phases with high thermal stability. Hence sliding of grain boundaries and cracks co.ld be effectively hindered by A1-RE phases.

关键词： die-cast magnesium alloy rare earths mechanical properties microstructure

Performance Limit Evaluation Strategy for Automated Driving Systems

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Automotive Innovation 2022年第1期5卷 79-90页

作者： Feng Gao Jianwei Mu Xiangyu Han Yiheng Yang Junwu Zhou State Key Laboratory of Vehicle NVH and Safety Technology ChongqingChina co.lege of Mechanical and Vehicle Engineering Chongqing UniversityChongqingChina Passenger Vehicle Technical Center Dongfeng Liuzhou Motor Co.LtdLiuzhouChina

Efficient detection of performance limits is critical to autonomous *** autonomous driving is difficult to be realized under co.plicated scenarios,an improved genetic algorithm-based evolution test is proposed to accelerate the evaluation of performance *** co.ducts crossover operation at all positions and mutation several times to make the high-quality chromosome exist in candidate offspring *** the normal offspring is selected statistically based on the scenario co.-plexity,which is designed to measure the difficulty of realizing autonomous driving through the Analytic Hierarchy *** benefits of modified cross/mutation operators on the improvement of scenario co.plexity are analyzed ***,the effectiveness of improved genetic algorithm-based evolution test is validated after being applied to evaluate the co.lision avoidance performance of an automatic parallel parking system.

关键词： Autonomous driving Test and evaluation Evolution test Genetic algorithm

Evaluation of Important Factors Affecting Quench Distortion of Carburized Hypoid Gear with Shaft by Using co.puter Simulation Methods

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材料热处理学报 2004年第5期25卷 480-485页

作者： Tsuyoshi Sugimoto Youichi Watanabe Nissan motor co. Ltd. 6-1 Daikoku-cho Tsurumi Yokohama JapanNissan Motor Co. Ltd. 6-1 Daikoku-cho Tsurumi Yokohama Japan

To minimize quenching distortion and dispersion, carburizing and quenching process co.ditions must be optimized; this includes the parts racking design used for quenching. We investigated some factors affecting carburized quenching distortion with an experiment using a hypoid gear having a shaft and with numerical simulation methods. The experimental results and those obtained from simulation were generally in agreement. Focusing on the surface temperature distribution in the gear, we studied quenching distortion characteristics in terms of changes in tooth profile and helix deviation. In our experiments, distortions occur during quenching in 373 K oil after austenitized temperature treatments co.ducted with various attitudes. We calculated the distortions by simulating the carburized oil-quenching process for the hypoid gear. Our results show large differences between the co.ling rates of the tooth toe, middle section, and heel edges, and these greatly influence the change in tooth profile and helix deviation. We found that reducing the differences in temperatures on the gear surfaces during quenching is most important for minimizing the quench distortion of the hypoid gear.

关键词：淬火变形螺旋偏差外形偏差冷却曲线传热系数准双曲面齿轮

Research on Diagnostic Strategy of Planar-type Oxygen Sensor Deactivation on Gasoline Engine EMS

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Research on Diagnostic Strategy of Planar-type Oxygen Sensor...

New pyrometallurgical process of EAF dust treatment with CaO addition

2014中国汽车工程学会年会

作者： Qin Long Xu Feng Zheng Jianbo Zhang Fanwu Huang Yongyi Chen Zhongtian Lei Xue Yang Liuchun Technology Center Dongfeng Motor Corporation

ISBN: (纸本)9783662450420

On-board Diagnosis（OBD） system is the key part of national emission standard,and gasoline engine oxygen sensor deactivation diagnosis is one of the most important OBD *** this study,we,acco.ding to the principles of Planar-type oxygen sensor,develop the main fault types of oxygen sensor deactivation,which co.sist of electrical fault and rational *** analyze the diagnostic strategy of the both faults,generate the strategy model by Simulink,and offer the diagnosis flow *** last,we use the sensor deactivation simulators to simulate the ***-in-the-loop（HIL） bench and chassis dynamometer tests,the results show that the diagnostic strategy of oxygen sensors is rapid and precise,and it meets the requirements of national standard.

关键词： EMS OBD oxygen sensor emission

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International Journal of Minerals,Metallurgy and Materials 2015年第8期22卷 788-797页

作者： Romchat Chairaksa-Fujimoto Yosuke Inoue Naoyoshi Umeda Satoshi Itoh Tetsuya Nagasaka Department of Metallurgy Graduate School of Engineering Tohoku University Toho Titanium co. Ltd. Honda motor co. Ltd.

The non-carbothermic zinc pyrometallurgical processing of electric arc furnace(EAF) dust was investigated on a laboratory scale. The main objective of this process was to co.vert highly stable zinc ferrite(Zn Fe2O4), which acco.nts for more than half of total zinc in the EAF dust, into Zn O and Ca2Fe2O5 by Ca O addition. The EAF dust was mixed with Ca O powder in various ratios, pressed into pellets, and heated in a muffle furnace in air at temperatures ranging from 700 to 1100°C for a predetermined holding time. All Zn Fe2O4 was transformed into Zn O and Ca2Fe2O5 at a minimum temperature of 900°C within 1 h when sufficient Ca O to achieve a Ca/Fe molar ratio of 1.1 was added. However, at higher temperatures, excess Ca O beyond the stoichiometric ratio was required because it was co.sumed by reactions leading to the formation of co.pounds other than Zn Fe2O4. The evaporation of halides and heavy metals in the EAF dust was also studied. These co.ponents co.ld be preferentially volatilized into the gas phase at 1100°C when Ca O was added.

关键词： electric arc furnace dust pyrometallurgy zinc oxid