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A global sensitivity analysis method for complex mechanisms of aircraft affected by multiple progressive damage 认领 引用
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作者 Zhixuan GAO Deyin JIANG +4 位作者 Jingyi LIU Huan PANG Weimin CUI Xinchen ZHUANG Tianxiang YU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第6期290-307,共18页
Failure of an aircraft Drag Chute Lock Mechanism(DCLM)can prevent the drag chute from being thrown properly,which may threaten the safety of aircraft and crew.The DCLM is affected by Multiple Progressive Damage(MPD)fa... Failure of an aircraft Drag Chute Lock Mechanism(DCLM)can prevent the drag chute from being thrown properly,which may threaten the safety of aircraft and crew.The DCLM is affected by Multiple Progressive Damage(MPD)factors during operation,and its global sensitivity analysis introduces many parameters that substantially increase the computational cost.This paper proposes a global sensitivity analysis method based on partial derivatives to solve the above problems,which reduces the dimensionality of the parameters to decrease the computational cost and improve the efficiency of global sensitivity analysis.Based on the operating principle of DCLM,it is analyzed for MPD factors,including wear,impact and creep.A reliability model considering MPD factors is developed for the DCLM,which is analyzed using a global sensitivity calculation method that is based on partial derivatives,and optimization suggestions for improving reliability are given for important input parameters.The results of the numerical study show that the proposed partial-derivative-based global sensitivity analysis method improves the efficiency of sensitivity analysis under consideration of the MPD and increases the reliability of the mechanism through parameter optimization. 展开更多
关键词 Drag chute lock mechanism Global sensitivity analysis Global sensitivity index based on partial derivatives Lower dimensionality Multiple progressive damage
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Low-Velocity Impact Response of Hybrid Fiber Reinforced Composite Thin-Walled Structures 认领 引用
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作者 Chaoshuai Duan Yin Wang +3 位作者 Guohua Zhu Xiaotian Zhang Jiale Wang Zhen Wang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第5期502-531,共30页
Hybrid fiber reinforced plastic(HFRP)composites,especially intra-layer carbon/glass hybrids,offer a promising balance of specific strength,impact resistance,and cost efficiency for thin-walled energy-absorbing structu... Hybrid fiber reinforced plastic(HFRP)composites,especially intra-layer carbon/glass hybrids,offer a promising balance of specific strength,impact resistance,and cost efficiency for thin-walled energy-absorbing structures.This study investigates the low-velocity impact response and energy absorption of intra-layer carbon/glass hybrid hat-shaped beams.Tensile and impact tests evaluated the effects of hybrid ratio and fiber orientation.A multiscale damage model based on micromechanical damage and failure criteria was established via Abaqus/VUMAT,integrating stress amplification factors to bridge micro-meso-macro scales.Experimental results show that carbon fibers aligned with the loading direction yield hybrid composites with superior tensile properties to carbon fiber reinforced plastic(CFRP).Under impact loading,the hybrid beams possess energy absorption values intermediate between those of single fiber reinforced composite beams,among which the B-[C0/G90]6 hybrid beam attains the maximum costeffectiveness,exceeding the pure CFRP beam by 27%.The established multi-scale model accurately predicts laminate tensile and hat-shaped beam impact responses,with all relative errors within 10%.Based on the validated model,orthogonal discrete optimization was performed using mesoscopic carbon fiber bundle fraction and macroscopic ply angle as design variables.Results indicate ply angle most significantly influences cost-effectiveness,leading to a 28.74%improvement post-optimization.This work provides an integrated multiscale modeling and optimization framework for performance-cost balanced intra-layer hybrid HFRP thin-walled structure design. 展开更多
关键词 Hybrid fiber reinforced plastic composites hat-shaped beams low-velocity impact multiscale model orthogonal discrete optimization
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The tribological behavior of a surface-nanocrystallized magnesium alloy AZ31 sheet after ultrasonic shot peening treatment 认领 引用 被引量：11
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作者 Jianyue Zhang Yongxin Jian +3 位作者 Xuzhe Zhao Dean Meng Fusheng Pan Qingyou Han 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2021年第4期1190-1203,共14页
A magnesium alloy AZ31 sheet was processed by ultrasonic shot peening treatment to fabricate a surface nanocrystalline,and a ball-on-disk dry sliding wear test was performed to evaluate the tribological behavior after... A magnesium alloy AZ31 sheet was processed by ultrasonic shot peening treatment to fabricate a surface nanocrystalline,and a ball-on-disk dry sliding wear test was performed to evaluate the tribological behavior after treatment.The microstructure observation indicated a gradient nanocrystalline structure was formed after USSP treatment.The microhardness at the top surface was improved from 60 HV to 145 HV after treatment.The formed nanocrystalline resulted in an easy formation of MgO patches on the surface and reduced the coefficient of friction.Moreover,the formed nanocrystalline leaded to a retard of delamination with increasing the sliding speed and applied load,which was due to its stronger sub-surface.Under high sliding speed(0.5 m/s)and high applied load(50 N),it was firstly found that the formed nanocrystalline prevented the happening of thermal softening and melting.The possible reasons accounting for the prevention of thennal softening and melting were discussed accordingly. 展开更多
关键词 AZ31Mg alloy Ultrasonic shot peening Surface-nanocrystallization Wear mechanism
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Stability analysis of complex terrain slope based on multi-source point cloud fusion 认领 引用 被引量：6
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作者 ZAN Wen-bo ZHANG Wen-jie +3 位作者 WANG Ning ZHAO Chun-chen YANG Qian LI Hao 《Journal of Mountain Science》 SCIE CSCD 2022年第9期2703-2714,共12页
Numerical modelling is a common routine for slope stability analysis in the complex terrain,and the accuracy of topographic survey has a great impact on the results.In this study,a combination of unmanned aerial vehic... Numerical modelling is a common routine for slope stability analysis in the complex terrain,and the accuracy of topographic survey has a great impact on the results.In this study,a combination of unmanned aerial vehicle(UAV)photogrammetry and 3D laser scanning technique was first proposed to establish a high-precision digital elevation model(DEM),which could be accurate to 0.2 m,fulfilling the engineering requirements.Then,a series of 3D/2D finite element models(FEM)were constituted on the basis of DEM to investigate the slope stability in the complex terrain.The results indicate that the deformation of complex terrain slope is chiefly triggered by compression-shear failure and the failure zones are mostly distributed on the middle-upper part and the scarp.Furthermore,the complex terrain slope is divided into concave,convex,concave-convex and convex-concave slope according to the topographical curvature,and the factor of safety(FOS)is as follows:the maximum value 1.8504 for the concave-convex slope,the minimum value 1.1129 for the convexconcave slope,and the median for either concave or convex slope.The inflection points and curvature of the slope jointly determine the shape of nonlinear slope,dominating the morphological effect on the slope stability,so the rational use of section morphological effect will be conducive to the overall stability of the slope.For four representative slopes,the plastic deformation first emerges into the middle,then progressively develops to the upper,and finally forms the connected failure zones. 展开更多
关键词 Slope stability Complex terrain DEM Numerical simulation Plastic zone Factor of Safety
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A quantum inspired genetic algorithm for multimodal optimization of wind disturbance alleviation flight control system 认领 引用 被引量：4
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作者 Qi BIAN Brett NENER Xinmin WANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2019年第11期2480-2488,共9页
This paper develops a Quantum-inspired Genetic Algorithm(QGA) to find the sets of optimal parameters for the wind disturbance alleviation Flight Control System(FCS). To search the problem domain more evenly and unifor... This paper develops a Quantum-inspired Genetic Algorithm(QGA) to find the sets of optimal parameters for the wind disturbance alleviation Flight Control System(FCS). To search the problem domain more evenly and uniformly, the lattice rule based stratification method is used to create new chromosomes. The chromosomes are coded and updated according to quantuminspired strategies. A niching method is used to ensure every chromosome can converge to its corresponding local minimum in the optimization process. A parallel archive system is adopted to monitor the chromosomes on-line and save all potential feasible solutions in the optimization process. An adaptive search strategy is used to gradually adjust the search domain of each niche to finally approach the local minima. The solutions found by the QGA are compared with some other Multimodal Optimization(MO) algorithms and are tested on the FCS of the Boeing 747 to demonstrate the effectiveness of the proposed algorithm. 展开更多
关键词 Flight control system Genetic algorithm Multimodal optimization Quantum inspired algorithm Wind disturbance alleviation
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Development and Analysis of a New Cylindrical Lithium-Ion Battery Thermal Management System 认领 引用 被引量：4
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作者 Yasong Sun Ruihuai Bai Jing Ma 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2022年第4期298-312,共15页
With the development of modern technology and economy,environmental protection and sustainable development have become the focus of global attention.The promotion and development of electric vehicles(EVs)have bright p... With the development of modern technology and economy,environmental protection and sustainable development have become the focus of global attention.The promotion and development of electric vehicles(EVs)have bright prospects.However,many challenges need to be faced seriously.Under diferent operating conditions,various safety problems of electric vehicles emerge one after another,especially the hidden danger of battery overheating which threatens the performance of electric vehicles.This paper aims to design and optimize a new indirect liquid cooling system for cylindrical lithium-ion batteries.Various design schemes for diferent cooling channel structures and cooling liquid inlet directions are proposed,and the corresponding solid-fuid coupling model is established.COMSOL Multiphysics simulation software is adopted to simulate and analyze the cooling systems.An approximate model is constructed using the Kriging method,which is considered to optimize the battery cooling system and improve the optimization results.Sensitivity parameter analysis and the optimization design of system structure are performed through a set of infuencing factors in the battery thermal management.The results indicate that the method used in this paper can efectively reduce the maximum core temperature and balance the temperature diferences of the battery pack.Compared with the original design,the optimized design,which is based on the non-dominated sorting genetic algorithm(NSGA-II),has an excellent ability in the optimized thermal management system to dissipate thermal energy and keep the overall cooling uniformity of the battery and thermal management system.Furthermore,the optimized system can also prevent thermal runaway propagation under thermal abuse conditions.In summary,this research can provide some practical suggestions and ideas for the engineering and production applications and structural optimization design carried by electric vehicles. 展开更多
关键词 Cooling system Electric vehicle Kriging approximation Numerical simulation
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Traffic assignment problem under tradable credit scheme in a bi-modal stochastic transportation network: A cumulative prospect theory approach 认领 引用 被引量：3
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作者 HAN Fei ZHAO Xiang-mo CHENG Lin 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第1期180-197,共18页
The traffic equilibrium assignment problem under tradable credit scheme(TCS) in a bi-modal stochastic transportation network is investigated in this paper. To describe traveler’s risk-taking behaviors under uncertain... The traffic equilibrium assignment problem under tradable credit scheme(TCS) in a bi-modal stochastic transportation network is investigated in this paper. To describe traveler’s risk-taking behaviors under uncertainty, the cumulative prospect theory(CPT) is adopted. Travelers are assumed to choose the paths with the minimum perceived generalized path costs, consisting of time prospect value(PV) and monetary cost. At equilibrium with a given TCS, the endogenous reference points and credit price remain constant, and are consistent with the equilibrium flow pattern and the corresponding travel time distributions of road sub-network. To describe such an equilibrium state, the CPT-based stochastic user equilibrium(SUE) conditions can be formulated under TCS. An equivalent variational inequality(VI) model embedding a parameterized fixed point(FP) model is then established, with its properties analyzed theoretically. A heuristic solution algorithm is developed to solve the model, which contains two-layer iterations. The outer iteration is a bisection-based contraction method to find the equilibrium credit price, and the inner iteration is essentially the method of successive averages(MSA) to determine the corresponding CPT-based SUE network flow pattern. Numerical experiments are provided to validate the model and algorithm. 展开更多
关键词 tradable credit scheme cumulative prospect theory endogenous reference points generalized path costs stochastic user equilibrium variational inequality model heuristic solution algorithm
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Characteristics of Diesel/N-Butanol Blend on a Common Rail Diesel Engine with Exhaust Gas Recirculation 认领 引用 被引量：1
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作者 Yanfei Chen Jingjing He +2 位作者 Hao Chen Xin Su Bin Xie 《Energy Engineering》 EI 2022年第3期1239-1259,共21页
20%n-butanol is blended in diesel by volume(noted as D80B20)and experiment has been carried out to study the effect on the combustion and emission characteristics based on a common rail diesel engine with exhaust gas ... 20%n-butanol is blended in diesel by volume(noted as D80B20)and experiment has been carried out to study the effect on the combustion and emission characteristics based on a common rail diesel engine with exhaust gas recirculation(EGR)system.The results reveal thatD80B20 has longer ignition delay,shorter combustion duration and higher maximumin-cylinder temperature than pure diesel(noted as D100).Further,the number concentration and volume concentration of ultrafine particles decrease significantly while NOX emissions increase a little with the addition of n-butanol.When the exhaust gas is induced into cylinder,NOX emissions significantly decrease and ultrafine particles emissions increase.The number geometric mean diameters and volume geometricmean diameters of ultrafine particles increase withEGR ratio.Compared toD100 without EGR,D80B20 with 20%EGR ratio can reduce both NOX and ultrafine particles emissions at 0.14MPa BMEP and 0.56MPa BMEP. 展开更多
关键词 n-butanol ultrafine particles combustion emission common rail diesel engine
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Research on Direct Yaw Moment Control Strategy of Distributed-Drive Electric Vehicle Based on Joint Observer 认领 引用 被引量：3
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作者 Quan Min Min Deng +3 位作者 Zichen Zheng Shu Wang Xianyong Gui Haichuan Zhang 《Energy Engineering》 EI 2021年第4期853-874,共22页
Combined with the characteristics of the distributed-drive electric vehicle and direct yaw moment control,a double-layer structure direct yaw moment controller is designed.The upper additional yaw moment controller is... Combined with the characteristics of the distributed-drive electric vehicle and direct yaw moment control,a double-layer structure direct yaw moment controller is designed.The upper additional yaw moment controller is constructed based on model predictive control.Aiming at minimizing the utilization rate of tire adhesion and constrained by the working characteristics of motor system and brake system,a quadratic programming active set was designed to optimize the distribution of additional yaw moments.The road surface adhesion coefficient has a great impact on the reliability of direct yaw moment control,for which joint observer of vehicle state parameters and road surface parameters is designed by using unscented Kalman filter algorithm,which correlates vehicle state observer and road surface parameter observer to form closed-loop feedback correction.The results show that compared to the“feedforward+feedback”control,the vehicle’s error of yaw rate and sideslip angle by the model predictive control is smaller,which can improve the vehicle stability effectively.In addition,according to the results of the docking road simulation test,the joint observer of vehicle state and road surface parameters can improve the adaptability of the vehicle stability controller to the road conditions with variable adhesion coefficients. 展开更多
关键词 Vehicle stability control distributed drive direct yaw moment control joint observer
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Progress in Mechanical Modeling of Implantable Flexible Neural Probes 认领 引用 被引量：1
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作者 Xiaoli You Ruiyu Bai +9 位作者 Kai Xue Zimo Zhang Minghao Wang Xuanqi Wang Jiahao Wang Jinku Guo Qiang Shen Honglong Chang Xu Long Bowen Ji 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第8期1205-1231,共27页
Implanted neural probes can detect weak discharges of neurons in the brain by piercing soft brain tissue,thus as important tools for brain science research,as well as diagnosis and treatment of brain diseases.However,... Implanted neural probes can detect weak discharges of neurons in the brain by piercing soft brain tissue,thus as important tools for brain science research,as well as diagnosis and treatment of brain diseases.However,the rigid neural probes,such as Utah arrays,Michigan probes,and metal microfilament electrodes,are mechanically unmatched with brain tissue and are prone to rejection and glial scarring after implantation,which leads to a significant degradation in the signal quality with the implantation time.In recent years,flexible neural electrodes are rapidly developed with less damage to biological tissues,excellent biocompatibility,and mechanical compliance to alleviate scarring.Among them,the mechanical modeling is important for the optimization of the structure and the implantation process.In this review,the theoretical calculation of the flexible neural probes is firstly summarized with the processes of buckling,insertion,and relative interaction with soft brain tissue for flexible probes from outside to inside.Then,the corresponding mechanical simulation methods are organized considering multiple impact factors to realize minimally invasive implantation.Finally,the technical difficulties and future trends of mechanical modeling are discussed for the next-generation flexible neural probes,which is critical to realize low-invasiveness and long-term coexistence in vivo. 展开更多
关键词 Mechanical modeling flexible neural probes invasive theoretical calculation simulation
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Diffusion of a Nonvolatile Fuel Spray in Swirl Flow 认领 引用
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作者 Yanju Wei Jie Zhang +3 位作者 Shengcai Deng Yajie Zhang Yajing Yang Hao Chen 《Energy Engineering》 EI 2021年第1期73-87,共15页
The diffusion of fuel spray in swirl flow is vital for the combustion of diesel engine,however,the researches on this is still mysterious due to the obstacles on direct investigations on a real engine.The research of ... The diffusion of fuel spray in swirl flow is vital for the combustion of diesel engine,however,the researches on this is still mysterious due to the obstacles on direct investigations on a real engine.The research of intake swirl in engine at present normally use CFD simulation or based on data analysis of combustion and exhaust emission,the specific mixing process of fuel in swirl flow still not very clear.In this paper,a rapid compression machine(RCM)with an optical combustion chamber was established with the mean compression velocity of 7.55 m/s.Three kinds of flow fields,including intense swirl field,weak swirl field and turbulent field,were conducted to investigate the diffusion characteristics of injected fuel,the mixing processes of fuel spray in the swirl flow fields were recorded by the high-speed camera.Experimental results show that the mixing of fuel spray in air consists of four stages:fuel injection,wall approaching,rapid diffusion and final diffusion.The fuel spray is firstly bended by the lateral flow of the swirl field,then liquid fuel is blown onto,and coats on,the sidewall.The fuel on the sidewall is finally enrolled into the chamber plenum afterwards in gaseous phase via the spiral arms(in swirl fields)or random routes(in turbulent field)At last the fuel disperses all over the chamber.The results give an intuitive observation and help better understand the air-fuel mixing process in diesel and direct inject gasoline engines. 展开更多
关键词 Rapid compression machine(RCM) diesel spray swirlflowfield air-fuel mixing
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Parameter Scaling of the Aerodynamic Breakup of the Acoustic Levitated Droplets in an Air Jet Flow 认领 引用
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作者 Yanju Wei Shengcai Deng +2 位作者 Jie Zhang Yajing Yang Hao Chen 《Energy Engineering》 EI 2021年第2期225-235,共11页
The aerodynamic breakup of the droplet has been intensely studied in this paper.We aim to establish a unified relationship between dimensionless kinematic parameters such as displacement,spreading diameter,Weber num-b... The aerodynamic breakup of the droplet has been intensely studied in this paper.We aim to establish a unified relationship between dimensionless kinematic parameters such as displacement,spreading diameter,Weber num-ber,time,and so on.The breakup characteristics of the acoustic levitated ethanol droplet are experimentally inves-tigated when exposed to an air jetflow.The breakup phenomenons were recorded with a high-speed camera.The breakup characteristics were analyzed,and the physical models of the moving and transforming behaviors were established to explain the breakup mechanisms.We found that the displacement of the windward side of the dro-plet follows free acceleration rule,with the displacement,acceleration,and time in the dimensionless form.The spreading of the diameter during deformation can also be written in a simple equation as a function of Weber number and displacement.We also discussed more details. 展开更多
关键词 Ethanol droplet breakup acoustic levitation physical model
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Research on Ecological Assessment and Dynamic Optimization of Energy-saving and New Energy Vehicle Business Model Based on Full Life Cycle Theory 认领 引用
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作者 Peipei Chao Yisong Chen Yanping Yang 《Journal of Mechanical Engineering Research》 2019年第2期14-22,共9页
The rapid development of China’s automobile industry has brought ever-increasing impact on resources,energy and environment,the energy-saving and new energy vehicles come into being accordingly.This article firstly s... The rapid development of China’s automobile industry has brought ever-increasing impact on resources,energy and environment,the energy-saving and new energy vehicles come into being accordingly.This article firstly systematically introduces the technical route of energy-saving and new energy vehicles of China,focusing on the key bottleneck problems arising from the construction process of current assessment system of the technical route for energy-saving and new energy vehicles,establishes the energy-saving and new energy vehicle business model assessment index system afterward based on the comparative analysis on energy-saving and new energy vehicle business assessment model and the full life cycle theory,and finally makes prospects and forecasts on vital problems of system boundary,dynamic optimization,simulation system of full life cycle assessment of energy-saving and new energy vehicle. 展开更多
关键词 Life cycle assessment theory Energy-saving and new energy vehicles Technical route Business model Dynamic optimization
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Analysis of Pedestrian Crossing Behavior Characteristics and a Pedestrian Crossing Intention Recognition Model 认领 引用
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作者 Qinyu Sun Chang Wang +4 位作者 Yingjiu Pan Hongjia Zhang Rui Fu Yingshi Guo Wei Yuan 《Automotive Innovation》 EI CSCD 2025年第4期935-948,共14页
Accurate identification of pedestrian crossing intention is the key to ensuring pedestrian safety,and the effective analysis of crossing behavior characteristics is one of the core requirements for the establishment o... Accurate identification of pedestrian crossing intention is the key to ensuring pedestrian safety,and the effective analysis of crossing behavior characteristics is one of the core requirements for the establishment of crossing intention recognition model.In this study,pedestrian intentions were classified as waiting for crossing and direct crossing,and the influences of the absence/presence of zebra stripes and the pedestrian age on pedestrian street-crossing intentions were compared based on 3600 effective samples extracted from a real road.The results demonstrate that the two factors have significant effects on the pedestrian crossing percentage,the waiting time,the accepted time to zebra stripes(TTZ),the rejected TTZ,and other characteristic parameters.Hence,to ameliorate the performance of the identification model,an ensemble learning method with a stacking framework is proposed for the identification of pedestrian waiting and direct crossing intentions.The distance between the pedestrian and the zebra stripes,the distance between the vehicle and the zebra stripes,the vehicle velocity,the pedestrian walking speed,the TTZ,the safe vehicle deceleration,waiting time,pedestrian age,and absence/presence of zebra stripes are employed as the inputs of the recognition model.The identification results indicate that the accuracy of the proposed model reaches 96.7%when pedestrians arrive at the road curb,which is the highest accuracy as compared to those of other models.The research conclusions could provide technical support for intelligent driving systems(IDSs)to more accurately recognize pedestrian street-crossing intentions,and can provide a basis for IDSs decision-making and interaction with pedestrian. 展开更多
关键词 Zebra stripes Crossing behavior characteristics Crossing intention recognition Ensemble learning
Comparison Between Cut-In Performance Model of ECE R157 and Behaviors of Chinese Drivers 认领 引用
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作者 Rui Liu Xuan Zhao +1 位作者 Xichan Zhu Jian Ma 《Automotive Innovation》 EI CSCD 2025年第2期281-292,共12页
Unlike widely used ADAS test approaches based on predefined typical scenarios,a new ADAS test methodology has been proposed by the United Nations Economic Commission for Europe Regulation No.157(ECE R 157),which verif... Unlike widely used ADAS test approaches based on predefined typical scenarios,a new ADAS test methodology has been proposed by the United Nations Economic Commission for Europe Regulation No.157(ECE R 157),which verifies whether ADAS meet safety requirements by comparing them to driver performance models.However,whether the driver performance models in ECE R157 can be utilized to characterize driver behaviors in China has not been validated,which limits advancements of globally consistent ADAS test procedures.In order to compare human drivers with the cut-in performance model in ECE R157,51 cut-in cases from 65,000 km naturalistic driving data collected in China were applied to analyze response characteristics of following vehicle’s drivers in the cut-in scenario.The results can be summarized as follows.First of all,90%of the drivers release accelerators and 75%of the drivers brake before lane-changers reach lane lines,whereas the cut-in performance model in ECE R157 brakes about 0.95 s after lane-changers reach lane lines.This phenomenon can be explained by preview features of drivers.Secondly,some drivers release accelerators until they see clear lane-changing maneuvers,whereas some drivers anticipate possibilities of lane-changing very early and release accelerators in advance.Thirdly,time headway should be employed as a risk estimator in the cut-in scenario rather than time-to-collision.These results can help to calibrate parameters in the cut-in performance model of ECE R157 according to behaviors of Chinese drivers and increase the scope of application for the test methodology proposed in ECE R157. 展开更多
关键词 ECE R157 Intelligent vehicle test Safety validation Advanced driver assistance systems Cut-in scenario Driver model
Optimization Study on Performance of Automotive Anode-Supported Solid Oxide Fuel Cells with Gradient Components Anode 认领 引用
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作者 Pei Fu Jianzhang Zhang +1 位作者 Ying Chen Yisong Chen 《Automotive Innovation》 EI CSCD 2025年第3期568-590,共23页
Solid oxide fuel cells(SOFCs)are an advanced green energy technology that efficiently harnesses H2 and is very important in transforming the energy landscape of vehicles.However,traditional SOFCs often struggle to mee... Solid oxide fuel cells(SOFCs)are an advanced green energy technology that efficiently harnesses H2 and is very important in transforming the energy landscape of vehicles.However,traditional SOFCs often struggle to meet vehicle performance demands.For anode-supported automotive SOFCs,the gradient anode design is considered an important structure that is expected to enhance the comprehensive performance.Although the optimization of anodes with gradient porosity and particle size has been well studied,the optimization of anodes with gradient component distributions has not been adequately researched.The performance of SOFC with homogenous anode components is well researched.The study analyzed the effect of the number of anode functional layers(AFLs)on SOFC performance,and the component distribution of the layered AFL was optimized using a combination of a back-propagation neural network(BPNN)and a genetic algorithm(GA).Finally,the distribution of the continuous gradient components in the AFL was optimized using the same methodology.The results show that the variation of component distribution in the anode support layer(ASL)has minimal impact on the SOFC performance;however,the SOFC performance is significantly enhanced when the anode is structured with two layers(l=2).The maximum power density(Pmax)of the layered anode(l=2)with optimized gradient components increased by 10.63%compared to a homogeneous anode structure.This improvement is observed when the electron conductor volume fractions of AFL1 and AFL2 are set at 64.37%and 46.50%,respectively,and when the components of AFL are continuously distributed according to a power function,the Pmax surpasses all other tested conditions. 展开更多
关键词 Automotive anode-supported SOFCs Gradient components anode Optimization study Back-propagation neural network Genetic algorithm
Feedstocks,environmental effects and development suggestions for biodiesel in China 认领 引用 被引量：5
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作者 Hao Chen Meijuan Ding +3 位作者 Yuan Li Hongming Xu Yangyang Li Zhao Wei 《Journal of Traffic and Transportation Engineering(English Edition)》 EI CSCD 2020年第6期791-807,共17页
In the usage phase,diesel engines fuelled with diesel-biodiesel blends produced lower soot,HC and CO emissions.However,the environmental effects should include the greenhouse gas(GHG)emissions.GHG variations of biodie... In the usage phase,diesel engines fuelled with diesel-biodiesel blends produced lower soot,HC and CO emissions.However,the environmental effects should include the greenhouse gas(GHG)emissions.GHG variations of biodiesel production from three generation feedstocks were analyzed based on the land use change(LUC).Adequate land use change could keep the biodiversity and did not cause the increase of GHG emissions.The choice for feedstocks of biodiesel in China was comprehensively analyzed based on the land use type,the precipitation and the oil contents and the cultivation conditions of plants.Then,the suggestions for biodiesel development in China were given.Results showed that China should thoroughly abandon the first generation feedstocks due to the lack of arable land.Jatropha curcas(J.curcas),Pistacia chinensis Bunge(P.chinensis),Comus wilsoniana(C.wilsoniana)and Xanthoceras sorbifolium Bunge(X.sorbifolium)were considered as the most promising feedstocks for biodiesel production.It is suggested to plant X.sorbifolium in sand lands in the north and northwest of China with less natural rainfall and the others in south and southwest of China.The concern for microalgae should be transmitted to engineering microalgae cultivated in wastewater.The microalgae biodiesel refinery should be developed together with wastewater proposal industry and coal fired power plants.Lastly,only natural gas-based or biomass-based methanol can be used for biodiesel production. 展开更多
关键词 Biodiesel Feedstock Greenhouse gas emission Land use change
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Cost-Based Research on Energy Management Strategy of Electric Vehicles Using Hybird Energy Storage System 认领 引用 被引量：2
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作者 Juanying Zhou Jianyou Zhao Lufeng Wang 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2024年第3期684-697,共14页
This paper uses the minimization and weighted sum of battery capacity loss and energy consumption under driving cycles as objective functions to improve the economy of Electric Vehicles(EVs)with an hybrid energy stora... This paper uses the minimization and weighted sum of battery capacity loss and energy consumption under driving cycles as objective functions to improve the economy of Electric Vehicles(EVs)with an hybrid energy storage system composed of power batteries and ultracapacitors.Furthermore,Dynamic Programming(DP)is employed to determine the objective function values under different weight coefficients,the comprehensive cost consisting of battery aging and power consumption costs,and the relationship between the hybrid power distribution.We also evaluate the real-time fuzzy Energy Management Strategy(EMS),fuzzy control strategies,and a strategy based on DP using the World Light vehicle Test Procedure(WLTP)driving cycle and a synthesis driving cycle derived from New European Driving Cycle(NEDC),WLTP,and Urban Dynamometer Driving Schedule(UDDS)as examples.Then,the proposed strategy is compared with the fuzzy control strategy and the strategy based on DP.Compared with fuzzy energy management strategy(namely FZY-EMS),the proposed EMS reduces the battery capacity loss and system energy consumption.The results demonstrate the effectiveness of the proposed EMS in improving EV economy. 展开更多
关键词 automobile engineering hybrid energy storage Energy Management Strategy(EMS) fuzzy control strategy
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Experimental investigation on the yield behavior of metal foam under shear-compression combined loading 认领 引用 被引量：2
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作者 LUO Geng XUE Pu LI YuLong 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2021年第7期1412-1422,共11页
Metal foams are typically subjected to quasi-static or dynamic shear-compression combined loading in applications such as energy absorbers and structure protectors. The yield behavior of a metal foam under dynamic and... Metal foams are typically subjected to quasi-static or dynamic shear-compression combined loading in applications such as energy absorbers and structure protectors. The yield behavior of a metal foam under dynamic and quasi-static shear-compression combined loadings is investigated in this study. First, quasi-static and dynamic compression-shear combined tests at different loading angles are conducted using a universal testing machine and a rotatable Hopkinson bar system, respectively. Shear deformation reduces the plateau stress as the loading angle increases. Subsequently, the yield modes of the metal foam under combined loadings are investigated. Only one yield band occurs under a combined loading with large loading angles(mode I),whereas several yield bands occur under a combined loading with small loading angles(mode II). Finally, the yield surface plot of metal foam indicates significant enhancement in terms of normal stress and shear stress under dynamic loading. Quasi-static and dynamic phenomenological yield criteria for a shear-normal stress space are established to provide a brief and precise prediction of the behavior of metal foam under quasi-static and dynamic combined loadings. 展开更多
关键词 metal foam yield behavior shear-compression combined loading yield mode yield criterion
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