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第七届亚太防雷国际会议

作者： Xiao Zhang Jinliang He State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Lightning overvoltage protection is of great importance to the safety of UHV *** widely used arresters can only suppress the magnitude of lightning overvoltage but lack efficiency on alleviating the *** practice, insulation failure of UHV transformer is often reported.A new protection method is proposed in this paper using ferromagnetic ring as supplement to arresters to suppress lightning overvoltage in UHV ***, equivalent model based on the characteristic of ferromagnetic material and factual dimension of the ring is established for *** of an actual 1000kV GIS is carried out to thoroughly evaluate the lightning overvoltage suppressing effect of ferromagnetic rings with different materials and structure dimensions.

关键词： ferromagnetic ring lightning overvoltage UHV

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Flatness-Based Vehicle Online Path Following with Time-varying Constraints of Dynamics

Flatness-Based Vehicle Online Path Following with Time-varyi...

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2011 China control and Decision Conference(2011中国控制与决策会议 CCDC)

作者： Chen Hong Cong Yanfeng Yu Zaitao Oliver Sawodny State key Laboratory of Automobile Dynamic Simulation JiLin University ChangChun PR China 130025 Stuttgart University Institute for System Dynamics. Stuttgart Germany 70511

In this paper, we consider the vehicle online path following under structure environment as object of our researching. By using the rolling method, a trajectory generation method based on flatness and a local path planning algorithm are proposed according to the characters of structure environment. In order to satisfy feasibility and safety, timevarying dynamics constraints are taken into account. The simulation results illustrate the effectiveness of our algorithm.

关键词： flatness motion planning time-varying dynamics constraint rolling optimization

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Research on the control Strategy of the Driving System for a Kind of Hybrid Electric Vehicle

Research on the Control Strategy of the Driving System for a...

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The 2011 International Conference on Instrumentation, Measurement, Circuits and Systems(ICIMCS 2011)

作者： Lu Fang Wang Deng-feng Li Da-peng State Key Laboratory of Automotive Simulation and Control Jilin University Technical Development Department FAW-Volkswagen Automotive CompanyLtd.

The features of driving system, the parameter matching and the control strategies of hybrid electric vehicle have determined the dynamic performance, the fuel economy, the emission characteristics, the manufacturing cost and the weight of the vehicle. In this paper, a kind of hybrid electric vehicle is considered as the research object and the control strategy of the driving system of this hybrid electric vehicle has been analyzed. Eventually, based on the parallel auxiliary driving, the system parameters have been selected according to the relevant system standards and the requirements for performance. At the same time, on account of the SOC torque balance control strategy, the simulation model of the whole system has been established by Matlab/Simulink. This simulation has verified the feasibility of the design and the effectiveness of the control strategies, which has achieved the desired goals. Compared with the traditional vehicles, this hybrid electric vehicle has improved the fuel economy and reduced the emissions.

关键词： Hybrid electric vehicle,control system,control strategy,system simulation

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Numerical Research on LNG Tank Leakage Effect on Environment for LNG Bus

Numerical Research on LNG Tank Leakage Effect on Environment...

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Asia-Pacific Power and Energy Engineering Conference

作者： Lei Zhang Ying Gao Da-wen Liu Peng Liu State Key Laboratory of Automobile Dynamic Simulation Jilin University

ISBN: (纸本)9781424462537

Study and analysis the fuel leakage security of current LNG alternative fuel bus. Do the simulation on surrounding concentration and temperature of LNG bus fuel tank leakage by Computational Fluid Dynamics (CFD). By analyzing the influence of three different bus velocities, 0km/h, 30km/h and 80km/h, we have the conclusion from the simulation that when the bus gets faster, the influence of surrounding becomes smaller.

关键词： LNG bus Leakage simulation

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Study on Thermal Management System for SCR on Hybrid Electric Buses

Study on Thermal Management System for SCR on Hybrid Electri...

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Asia-Pacific Power and Energy Engineering Conference

作者： Lianxu Wang Changji Zhu Luyan Fan Ye Tian State Key Laboratory of Automobile Dynamic Simulation Jilin University

ISBN: (纸本)9781424462537

According to the problems that the dropping of SCR catalyst temperature lead to increasing the NO_x emissions on the conditions of DFCO (deceleration fuel cut off) and autostop while hybrid electric buses in operation, this paper developed the thermal management system for SCR. The system consists chiefly of cylindrical electric blinds, two-position and three-port solenoid valve, electronic control unit, drive mechanism and other components. The thin layer heat-resistant insulating coating was applied to improve the thermal insulation effect of the blinds. The electronic control unit of the system collects the data from exhaust temperature transducers, and then estimates SCR catalyst temperature. When the temperature drops or rises to a certain value, the drive mechanism is controlled to achieve the opening and closing of blinds to attain the purpose of heat insulation or heat transfer. This paper set up a tube on the original exhaust pipe in front of the exhaust aftertreatment devices. In order to overcome the effect of DFCO on the hybrid electric buses emissions, the two-position and three-port solenoid valve is controlled to change the path of the gas emission.

关键词： Hybrid electric buses SCR catalyst temperature Thermal management system

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3D simulation Research on Hazard of Fuel System Leakage of LNG Bus

3D Simulation Research on Hazard of Fuel System Leakage of L...

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Asia-Pacific Power and Energy Engineering Conference

作者： Ying Gao Peng Liu Dawen Liu Lei Zhang State Key Laboratory of Automobile Dynamic Simulation Jilin University

ISBN: (纸本)9781424462537

Liquefied Natural Gas (LNG) is being developed as a transportation fuel for transit buses, to lessen the dependency on oil and to reduce greenhouse gas emissions. But LNG is hazardous because of its temperature, the possibility of asphyxiation and of course the fire risk. This paper describes the use of Fluent, a widely-used commercial CFD code, to simulate the dynamics of spills from LNG bus fuel system. The study presents the results of hazardous zones around LNG bus in the event of LNG bus fuel system release. This investigation provides valuable references for the design and optimization of LNG bus structure and for the numerical study on the unsteady three-dimensional conjugated heat transfer with phase change.

关键词： Liquefied natural gas(LNG) Spill model CFD Alternative fuels Hazard

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LPG Engine Inlet Manifold Pressure Measurement Based on state Prediction

LPG Engine Inlet Manifold Pressure Measurement Based on Stat...

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Asia-Pacific Power and Energy Engineering Conference

作者： Dawei Qu Luyan Fan Ye Tian Lianxu Wang Yan Zhang State Key Laboratory of Automobile Dynamic Simulation Jilin University

ISBN: (纸本)9781424462537

Based on the physical dynamic properties model of the intake system (from the state equation and measurement equation) and the intake system model and the statistical properties assumption of sensor noise, the measured data was mapped to the state space. Then using the state predictor, through the EKF (Extended Kalman Filter), preprocessing the data from the intake manifold absolute pressure sensor, through the model transformation, unit transformation the sensor's output signal is converted to the state variable describing the amount of intake air, then according to the established state equation of the intake system and the mathematical model of the measuring physical properties, under some criterias for optimal estimation, the optimal estimation was carried out so that the state vector and measurement vector achieve the best fit, to obtain optimal estimates of intake air amount.

关键词： LPG engine state Prediction EKF Inlet Manifold Pressure

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Research on surface electric field of parallel gap

Research on surface electric field of parallel gap

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2011 7th Asia-Pacific International Conference on Lightning, APL2011

作者： Yu, Junjie Yu, Zhanqing Zeng, Rong Chen, He Peng, Xiang State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Beijing 100084 China Maintenance and Test Center of EHV Power Transmission Company China Southern Power Grid Co. Ltd. Guangzhou 510663 China

ISBN: (纸本)9781457714665

With parallel gap, by controlling the motion path of the electric arc, effectively avoid burning and damaging the insulator during lightning strike so that the effect to reduce the accident rate of line is obvious. Because of simple structure, convenient installation and good economical efficiency, its importance in measures of lightning protection for transmitting line is continually improved. Electric field characteristics on the surface of parallel gap electrode have obvious influence on corona generation and the gap breakdown position and are the key parameters that must be considered in the design. Based on the finite element method, this paper sets up the analysis model of electric field of parallel gap including the tower, the conductor and the insulator, uses ANSOFT software for simulation, studies the surface electric field characteristics of parallel gap electrode, compares the electric field of four types of parallel gap put forward in the paper and analyzes the law of influence of parallel gap electrode parameters on the electric field characteristics. The results show that, when the short circuit distance is increased, the maximum values of electric field of ball end and snap ring body are obviously increased;the opening angle of snap ring is larger and the maximum value of electric field of ball end is higher;when the pipe diameter is increased, the maximum value of electric field of snap ring body is reduced considerably;the ball end is bigger and the maximum value of electric field of ball end is less;the ring pipe diameter is the structure parameter having the largest influence on the surface electric field;for the ball end at the end of ring electrode, the structure parameter having the largest influence on the electric field is the diameter of ball end. Reducing the distance that the ball end stands out of the ring plane can decrease the maximum value of electric field of ball end. © 2011 IEEE.

关键词： Finite element method

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Research on impulse discharge characteristics of parallel gap

Research on impulse discharge characteristics of parallel ga...

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2011 7th Asia-Pacific International Conference on Lightning, APL2011

作者： Chen, He Peng, Xiang Yu, Zhanqing Yu, Junjie Zeng, Rong Maintenance and Test Center of EHV Power Transmission Company China Southern Power Grid Co. Ltd. Guangzhou 510663 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Beijing 100084 China

ISBN: (纸本)9781457714665

With parallel gap, by controlling the motion path of the electric arc, effectively avoid burning and damaging the insulator during lightning strike so that its importance in measures of lightning protection for transmitting line is continually improved. Initial discharge position is key consideration during design of parallel gap and depends on discharge characteristics of parallel gap under the action of lightning surge when the lightning strikes the tower or line. This paper gives three types of parallel gap used to protect the composite insulator, sets up the impulse discharge test and observation platform including high-speed camera, studies the impulse discharge characteristics of parallel gap and analyzes the influence of structural parameters on the discharge characteristics. This study showed that there is randomness for discharge path of parallel gap;three types of parallel gap given in this paper can achieve 100% discharge rate of parallel gap;the determinant of discharge rate in the presupposition discharge area (PDA) is the distance that the presupposition discharge area stands out of the whole electrode plane. When this distance exceeds 20mm or more, it can ensure that most of the discharge occurs in the PDA;the parallel gap can reduce the insulation distance of 4000mm insulator about 40mm, U50 about 1%, which may approximately consider that the parallel gap has no influence on the insulating property of the insulator. © 2011 IEEE.

关键词： Electric arcs

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Method of the vehicle's handling and stability objective evaluation based on multi-variate statistical analysis

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) 2011年第SUPPL. 2期41卷 6-11页

作者： Wang, Yan-Hui Guo, Kong-Hui Lu, Bing-Wu Ying, Guo-Zeng Qin, Min State Key Laboratory of Automotive Simulation and Control Jilin University Changchun 130022 China State Key Lab. of Comprehensive Technology on Automobile Vibration and Noise and Safety Control Changchun 130011 China

Taking the vehicle's handling and stability performance targets as research object, the theory of multi-variate statistical analysis was used to find the relationship of the targets each other. Several new handling targets are rebuilt sorted by their importance based on the idea of decreasing dimension, and then the vehicle's handling centesimal system score was get by the objective weighting method. The results show that it's available to evaluate the vehicle's handling performance using fewer targets and the weighting score.

关键词： Principal component analysis

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