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Experimental Study on Occupant's Thermal Responses under the Non-uniform Conditions in Vehicle Cabin during the Heating Period

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Chinese Journal of Mechanical Engineering 2014年第2期27卷 331-339页

作者： ZHANG Wencan chen jiqing LAN Fengchong School of Mechanical & Automotive Engineering South China University of Technology School of Mechanical & Electrical Engineering Foshan University Key Laboratory of Guangdong Province of Automotive Engineering South China University of Technology

The existing investigations on thermal comfort mostly focus on the thermal environment conditions, especially of the air-flow field and the temperature distributions in vehicle cabin. Less attention appears to direct to the thermal comfort or thermal sensation of occupants, even to the relationship between thermal conditions and thermal sensation. In this paper, a series of experiments were designed and conducted for understanding the non-uniform conditions and the occupant＇s thermal responses in vehicle cabin during the heating period. To accurately assess the transient temperature distribution in cabin in common daily condition, the air temperature at a number of positions is measured in a full size vehicle cabin under natural winter environment in South China by using a discrete thermocouples network. The occupant body is divided into nine segments, the skin temperature at each segment and the occupant＇s local thermal sensation at the head, body, upper limb and lower limb are monitored continuously. The skin temperature is observed by using a discrete thermocouples network, and the local thermal sensation is evaluated by using a seven-point thermal comfort survey questionnaire proposed by American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc（ASHRAE） Standard. The relationship between the skin temperature and the thermal sensation is discussed and regressed by statistics method. The results show that the interior air temperature is highly non-uniform over the vehicle cabin. The locations where the occupants sit have a significant effect on the occupant＇s thermal responses, including the skin temperature and the thermal sensation. The skin temperaWa-e and thermal sensation are quite different between body segments due to the effect of non-uniform conditions, clothing resistance, and the human thermal regulating system. A quantitative relationship between the thermal sensation and the skin temperature at each body segment of occupant in real

关键词： vehicle cabin thermal environment thermal comfort skin temperature non-uniform

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Mechanical Properties Prediction of the Mechanical Clinching Joints Based on Genetic Algorithm and BP Neural Network

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Chinese Journal of Mechanical Engineering 2009年第1期22卷 36-41页

作者： LONG Jiangqi LAN Fengchong chen jiqing YU Ping School of Mechanical ＆ Automotive Engineering South China University of Technology Guangzhou 510641 China

For optimal design of mechanical clinching steel-aluminum joints, the back propagation （BP） neural network is used to research the mapping relationship between joining technique parameters including sheet thickness, sheet hardness, joint bottom diameter etc., and mechanical properties of shearing and peeling in order to investigate joining technology between various material plates in the steel-aluminum hybrid structure car body. Genetic algorithm （GA） is adopted to optimize the back-propagation neural network connection weights. The training and validating samples are made by the BTM Tog-L-Loc system with different technologic parameters. The training samples＇ parameters and the corresponding joints＇ mechanical properties are supplied to the artificial neural network （ANN） for training. The validating samples＇ experimental data is used for checking up the prediction outputs. The calculation results show that GA can improve the model＇s prediction precision and generalization ability of BP neural network. The comparative analysis between the experimental data and the prediction outputs shows that ANN prediction models after training can effectively predict the mechanical properties of mechanical clinching joints and prove the feasibility and reliability of the intelligent neural networks system when used in the mechanical properties prediction of mechanical clinching joints. The prediction results can be used for a reference in the design of mechanical clinching steel-aluminum joints.

关键词： genetic algorithm BP neural network mechanical clinching joint properties prediction

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Investigation into Improvement for Anti-Rollover Propensity of SUV

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Chinese Journal of Mechanical Engineering 2017年第3期30卷 698-710页

作者： Fei Xiong Fengchong Lan jiqing chen Yuedong Yang School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510640China Guangzhou Automobile Group Co.Ltd Automotive Engineer Institute Guangzhou 511434China

Currently, many research from domestic and foreign on improving anti-rollover performance of vehicle mainly focus on the electronic control of auxiliary equip- ment, do not make full use of suspension layout to optimize anti-rollover performance of vehicle. This investigation into anti-rollover propensity improvement concentrates on the vehicle parameters greatly influencing on anti-rollover propensity of vehicle. A simulation based on fishhook procedure is used to perform design trials and evaluations aimed at ensuring an optimal balance between vehicle＇s design parameters and various engineering capacities, the anti-rollover propensity is optimized at the detailed design stage of a new SUV model. Firstly a four-DOF theoretical kinematic model is established, then a complete multi-body dynamics model built in ADAMS/car based on the whole vehicle parameters is correlated to the objective handing and stability test results of a mule car. Secondly, in fish- hook test simulations, the Design of Experiments method is used to quantify the effect of the vehicle parameters on the anti-rollover performance. By means of the simulation, the roll center height of front suspension should be more than 30 mm, that of rear suspension less than 150 mm, and the HCG less than 620 mm for the SUV. The ratio of front to rear suspension roll stiffness should be ranged from 1.4 to1.6 for the SUV. As a result, at the detailed design stage of product, the anti-rollover performance of vehicle can be improved by optimizing chassis and integrated vehicle parameters.

关键词： Fishhook test Tire normal force Roll center Roll stiffness

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Control Algorithm of Electric Vehicle in Coasting Mode Based on Driving Feeling

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Chinese Journal of Mechanical Engineering 2015年第3期28卷 479-486页

作者： SUN Daxu LAN Fengchong ZHOU Yunjiao chen jiqing School of Mechanical & Automotive Engineering South China University of Technology Key Laboratory of Guangdong Province of Automotive Engineering South China University of Technology

Coasting in gear is a common driving mode for the conventional vehicle equipped with the internal combustion engine（ICE）, and the assistant braking function of ICE is utilized to decelerate the vehicle in this mode. However, the electric vehicle（EV） does not have this feature in the coasting mode due to the relatively small inertia of the driving motor, so it will cause the driver cannot obtain the similar driving feeling to that of the conventional vehicle, and even a traffic accident may occur if the driver cannot immediately adapt to the changes. In this paper, the coasting control for EV is researched based on the driving feeling. A conventional vehicle equipped with continuously variable transmission（CVT） is taken as the reference vehicle, and the combined simulation model of EV is established based on AVL CRUISE and MATLAB/Simulink. The torque characteristic of the CVT output shaft is measured in coasting mode, and the data are smoothed and fitted to a polynomial curve. For the EV in coasting mode, if the state of charge（SOC） of the battery is below 95%, the polynomial curve is used as the control target for the torque characteristic of the driving motor, otherwise, the required torque is replaced by hydraulic braking torque to keep the same deceleration. The co-simulation of Matlab/Simulink/Stateflow and AVL CRUISE, as well as the hardware-in-loop experiment combined with d SPACE are carried out to verify the effectiveness and the real-time performance of the control algorithm. The results show that the EV with coasting braking control system has similar driving feeling to that of the reference vehicle, meanwhile, the battery SOC can be increased by 0.036% and 0.021% in the initial speed of 100 km/h and 50 km/h, respectively. The proposed control algorithm for EV is beneficial to improve the driving feeling in coasting mode, and it also makes the EV has the assistant braking function.

关键词： electric vehicle coasting braking control algorithm engine braking motor braking

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Uncertainty Optimization Design of a Vehicle Body Structure Considering Random Deviations

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Automotive Innovation 2018年第4期1卷 342-351页

作者： Jianhua Zhou Fengchong Lan jiqing chen Fanjie Lai School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510640China Guangdong Provincial Key Laboratory of Automotive Engineering Guangzhou 510640China

In vehicle body manufacturing,there are small differences between the actual value and design value of,for example,plate thickness and material *** is caused by the processing technology,environment and other uncertain ***,the performance of the vehicle body processed according to the deterministic optimization solution *** fluctuations may make structural performance fail to meet the design ***,in this study,an optimization design is executed with 6σrobustness criteria and a Monte Carlo simulation single-loop optimization strategy based on the radial basis function neural network approximate model considering deviations in plate thickness,elastic modulus,and welding spot diameter,which is called the uncertainty optimization design *** an example,considering the bending stiffness,torsion stiffness,and first-order frequency as constraints,the method is applied to the lightweight design of a car body structure,and the reliability of deterministic optimization design and uncertainty optimization design is *** results demonstrate that the uncertainty optimization design solution is effective and feasible without lowering the static stiffness and modal performance,and the weight is reduced.

关键词： Body structure Lightweight Approximate models 6σrobustness criteria MCS single-loop optimization strategy

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Vibration Characteristics of Framed SUV Cab Based on Coupled Transfer Path Analysis

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Automotive Innovation 2019年第1期2卷 26-34页

作者： Wei Yang jiqing chen Zongjian Liu Fengchong Lan School of Mechanical and Automotive Engineering South China University of Technology and Guangdong Provincial Key Laboratory of Automotive EngineeringGuangzhou 510641China

The vibration transmission paths in a sport-utility vehicle with a frame structure were used to evaluate the coupled vibra-tion of each vibration transmission *** method was based on the transmission path of an“engine-powertrain mount system-frame-vehicle body suspension-body-driver seat rail,”and the research objective was to improve the vibration char-acteristics of the *** coupled transfer path analysis combined analysis and experiment to establish the vehicle vibration transmission path model and a finite element simulation *** this method,the vibration level of the driver’s seat rail was reduced and engineering practice was effectively used to improve the vibration characteristics of the *** method was applied to a framed SUV cabin.

关键词： Framed SUV SUV cabin Vibration characteristics Coupling Transfer path

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Design and Development of Pop-up Engine Hood System with Dual Elastic Buffer and Evaluation of Performance of Pedestrian Protection

Design and Development of Pop-up Engine Hood System with Dua...

引用

2014中国汽车工程学会年会

作者： Li Xinxian chen jiqing Lan Fengqiong School of Mechanical and Automotive Engineering South China university of Technology

ISBN: (纸本)9783662450420

Based on the purpose of pedestrian protection,a new Pop-up Engine Hood System（PEHS） with an effect of elastic butter is developed to reduce the injuiy of pedestrians in unavoidable human-car collision *** the fusion of computer vision and laser scanner technology is the best way to tackle the problem of both responsiveness and *** parameter of the device is *** a reusable PEHS using mechanical spring is designed by using optimization *** setting up the 3- dimentional model *** model,the performance of bouncing and injuiy protection of the system has been proved by kinematics simulation and prototype experiment.

关键词： automobile active safety pedestrian protection pop-up engine hood system

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Fatigue Durability Analysis of a Frame Based on Multi Body Dynamics 1

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2016中国汽车工程学会年会暨展览会

作者： Zhang Qin Lan Fengchong chen jiqing Huang Qinsheng School of Mechanical ＆ Automotive Engineering South China University of Technology

ISBN: (数字)9789811035272

ISBN: (纸本)9789811035265;9789811098963

In view of the long cycle and high cost of the fatigue durability test of the vehicle frame prototype,a fatigue analysis procedure based on virtual prototype and multi- body dynamics was *** the first 5 modes frequencies of the finite element model and verified it by experimental *** the finite element model of the frame into flexible body,combined with suspensions,tires and body to establish a multi body dynamics model of rigid flexible coupling *** ddynamic response of the model in class D road at a uniform motion,extracted load-time history of the connected locations;Fitted the S-N curve of material through the tensile strength limit;combined with the stress distribution of unique load,forecasted the dangerous positions and theirs fatigue *** results shown that the frame damage hotspots were mainly distributed in the bracket connected with the body,frequency domain energy of connected location load is within 18 Hz,the minimum fatigue life mileage was 2.38 x 10 *** results had a guiding significance for the research of the fatigue durability of vehicle frame.

关键词： fatigue durability rigid flexible coupling multi body dynamics frame model analysis

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核电机组主变压器分侧差动保护误动缺陷原因分析及对策

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核动力工程 2017年第S2期38卷 93-96页

作者：陈吉庆中核核电运行管理有限公司浙江海盐314300

通过对核电厂一起主变压器分侧差动保护误动缺陷的描述,阐述了主变压器分侧差动的原理,详细分析了故障原因,并针对故障原因在电流互感器选型、保护定值整定等方面提出了相应对策,为相关技术人员提供了类似缺陷的处理经验。

关键词：主变压器分侧差动电流互感器定值整定

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CENTURY WITH A NEW LOOK

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China Oil & Gas 1999年第1期6卷 43-44页

作者： chen jiqing (China Oil & Gas Pipeline Bureau)

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