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SAE 2014 World Congress and Exhibition

作者： Han, Fei Deng, Weiwen Zhang, Sumin Wu, Jian Wang, Yu Liu, Bin Shang, Bingxu Qiu, Shaobo State Key Lab of Automotive Simulation and Control Jilin Univ China R and D Center China FAW Group China

This paper presents a novel real-time virtual simulation environment for advanced driver assistance systems (ADAS). The proposed environment mainly includes a 3D high-fidelity virtual driving environment developed with computer graphics technologies, a virtual camera model and a real-time hardware-in-the-loop (HIL) system with a driver simulator. Some preliminary simulation and experiment have been conducted to verify that the proposed virtual environment along with the image generated by a virtual camera model is valid with sufficient fidelity, and the real-time HIL development system with driver in the loop is effective in the early design, test and verification of ADAS systems. Copyright © 2014 SAE International.

关键词： Advanced driver assistance systems

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Research of algorithm and analysis of performance for DC surge impedance relay

Research of algorithm and analysis of performance for DC sur...

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12th IET International Conference on Developments in Power System Protection, DPSP 2014

作者： Lei, Aoyu Dong, Xinzhou State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 10084 China

Surge Impedance Relay(SIR) is applied to DC system. Characteristics of SIR in DC line are analysed. A DC SIR algorithm implementing wavelet transform applied to HVDC line protection is proposed. The feasibility of DC ... 详细信息

ISBN: (纸本)9781849198349

关键词： Wavelet transforms

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Shift quality evaluation of DCT based on TOPSIS model

Shift quality evaluation of DCT based on TOPSIS model

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SAE 2014 World Congress and Exhibition

作者： Fu, Yao Lei, Yulong Shaohua, Sun Zeng, Huabing Liu, Ke Zhang, Yuanxia State Key Lab of Automotive Simulation Control Jilin Univ. No. 5988 Renmin St. Changchun City 130022 China

After the analysis of shift quality evaluation methods of stepped automatic transmission, the evaluation indexes of shift quality have been established based on power-on up-shift of DCT (dual clutch transmission). Shift quality objective evaluation method of DCT based on TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) model is proposed. Taking the ideal shift process as reference, the shift quality evaluation model based on absolute ideal solution is developed. A comparison with the subjective evaluations shows that the proposed method is in good agreement with the traditional subjective evaluation method. The TOPSIS model provides a new shift quality evaluation approach and thinking for stepped automatic transmission. Copyright © 2014 SAE International.

关键词： Quality control

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Modeling and simulation of intelligent driving with trajectory planning and tracking

Modeling and simulation of intelligent driving with trajecto...

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作者： Wu, Mengxun Deng, Weiwen Zhang, Sumin Sun, Hao Liu, Bin Shang, Bingxu Qiu, Shaobo State Key Lab. of Automotive Simulation and Control Jilin Univ. China R and D Center China FAW Group China

This paper proposes a novel modeling and simulation environment developed under Matlab/Simulink with friendly and intuitive graphic user interfaces, aimed to enable math-based virtual development and test of intelligent driving systems. Six typical driving maneuvers are first proposed, which are further abstracted into two atomic sub-maneuvers: lane following and lane change, as any maneuvers can be the combinations of these two. A generic trajectory planning and path tracking control algorithm are developed to deal with the generality and commonality of the lane change function with optimization among safety, comfort and efficiency in performing the lane change maneuver. Some typical simulations are conducted with results demonstrating the practical usefulness, efficiency and convenience in using this proposed tool. Copyright © 2014 SAE International.

关键词： Simulink

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Optimization of plastic trunk lid molding parameters based on ANN

Optimization of plastic trunk lid molding parameters based o...

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3rd International Conference on Manufacture Engineering, Quality and Production System, ICMEQP 2014

作者： Yu, Duo Nian Shao, Chang Ming Han, Lu Zhang, Ben Yan Zhou, Lu Yao State Key Lab of Automobile Simulation and Control JilinUniversity Changchun China CHINA FAW GROUP CORPORATION R and D CENTER Changchun China

ISBN: (纸本)9783038350910

A trunk lid plate is taken as an example and Fiberglass-reinforced PET material is used to replace steel for weight-saving in this paper. Chooseinjection molding as plate's forming methodto find the optimal parameters in given range. To predict plastic parts' warpage under different injection parameters and find the optimal parameters, the method of Artificial Neural Network (ANN) is used. © (2014) Trans Tech Publications, Switzerland.

关键词： Neural networks

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A quantitative assessment framework for model quality evaluation of 3D scene under simulation platform

A quantitative assessment framework for model quality evalua...

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SAE 2014 World Congress and Exhibition

作者： Wang, Ying Han, Fei Kong, Yue Deng, Weiwen State Key Lab of Automotive Simulation and Control Jilin University 130025 China College of Computer Science and Technology Jilin University 130012 China

Vision-based Advanced Driver Assistance Systems (Vi-ADAS) has achieved rapid growth in recent years. Since vehicle field testing under various driving scenarios can be costly, tedious, unrepeatable, and often dangerous, simulation has thus become an effective means that reduces or partially replaces the conventional field testing in the early development stage. This paper proposes a quantitative assessment framework for model quality evaluation of 3D scene under simulation platform. An imaging model is first built. The problem of solving the imaging model is then transformed into the problem of intrinsic image decomposition. Based on Retinex theory and Non-local texture analyses, a superior intrinsic image decomposition method is adopted to evaluate the fidelity of the 3D scene model through the degree of deviation to the Reflectance and Shading intrinsic maps respectively. Some preliminary testing results demonstrate that the proposed assessment framework can produce quantitative evaluation on 3D scene models. Copyright © 2014 SAE International.

关键词： Advanced driver assistance systems

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The bandwidth of instrument current transformer for fault detection in distribution networks

The bandwidth of instrument current transformer for fault de...

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12th IET International Conference on Developments in Power System Protection, DPSP 2014

作者： Jiang, Bo Dong, Xinzhou Shi, Shenxing Wang, Bin Bak, Dominik State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781849198349

The distribution network detection devices are generally using two kinds of instrument current transformer (ICT), of which one is used to transform the travelling wave and transient signals, while the other is used to transform the power frequency signals. Such scheme is neither necessary nor economical. This paper analyses the influences of sampling resistance, stray capacitance and magnetizing inductance on the frequency characteristic of ICT. Considering that fault zero sequence transient current has big transient component and small power frequency component, an ICT with wide band frequency accuracy has been chosen. Practical experiments have been done. The technical parameters given by the instrument factory are only within 20-20kHz. The characteristics in higher frequency are seldom reported due to the lack of test means. The experiments in this paper is based on the transient tester instrument and current amplifiers developed by our laboratory, which can output wide frequency band current within 20Hz-100kHz up to 50A. Experiment shows that, the predicted results were in good agreement with the measured ones.

关键词： Electric instrument transformers

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Travelling wave sampling data sharing solution in distribution substation based on IEC61850

Travelling wave sampling data sharing solution in distributi...

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12th IET International Conference on Developments in Power System Protection, DPSP 2014

作者： Ni, Jiang Wang, Bin Dong, Xinzhou State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781849198349

The signal of travelling wave has the merit of immunity to system oscillation, transition resistance, CT saturation and the neutral point operation modes;it has been widely applied in field of fault detection and protection. Especially in isolated neutral grounded wind farm distribution network, the algorithm using multiple-bay travelling wave's information can exclusively achieve the fast fault feeder selection and tripping. However, travelling wave sampling frequency tends to reach 500 to 1000 times of that in algorithms with power frequency signal. The direct of travelling wave sampling data sharing in process bus would produce the communication block, and weaken the security of whole substation automation. To solve this problem, the performance of communication in process bus is theoretically analyzed and simulated in this paper, the communication requirement of travelling waves is quantified, and then a feasible scheme is proposed with data pre-processing and fault characteristic abstraction moving forward into the merging unit. simulations prove its validity. The work in paper can promote the wide application of travelling waves in substation based on IEC61850.

关键词： Merging

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STATISTICAL CHARACTERISTICS AND NUMERICAL simulation OF SEA-LAND BREEZES IN HAINAN ISLAND

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Journal of Tropical Meteorology 2014年第3期20卷 267-278页

作者：张振州曹超雄宋宇康凌蔡旭晖 Department of Environmental Sciences College of Environmental Sciences and Engineering Peking University State Joint Key Lab of Environmental Simulation and Pollution Control Unit 91715 of PLA Navy Guangzhou Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction China Meteorological Administration

The sea-land breeze circulation(SLBC) occurs regularly at coastal locations and influences the local weather and climate significantly. In this study, based on the observed surface wind in 9 conventional meteorological stations of Hainan Island, the frequency of sea-land breeze(SLB) is studied to depict the diurnal and seasonal variations. The statistics indicated that there is a monthly average of 12.2 SLB days and an occurrence frequency of about 40%, with the maximum frequency(49%) in summer and the minimum frequency(29%) in autumn. SLB frequencies(41%) are comparable in winter and spring. A higher frequency of SLB is present in the southern and central mountains due to the enhancement effect of the mountain-valley breeze. Due to the synoptic wind the number of SLB days in the northern hilly area is less than in other areas. Moreover, the WRF model, adopted to simulate the SLBC over the island for all seasons, performs reasonably well reproducing the phenomenon, evolution and mechanism of SLBC. Chiefly affected by the difference of temperature between sea and land, the SLBC varies in coverage and intensity with the seasons and reaches the greatest intensity in summer. The typical depth is about 2.5 km for sea breeze circulation and about 1.5 km for land breeze circulation. A strong convergence zone with severe ascending motion appears on the line parallel to the major axis of the island, penetrating 60 to 100 km inland. This type of weak sea breeze convergence zone in winter is north-south oriented. The features of SLBC in spring are similar both to that in summer with southerly wind and to that in winter with easterly wind. The coverage and intensity of SLBC in autumn is the weakest and confined to the southwest edge of the central mountainous area. The land breeze is inherently very weak and easily affected by the topography and weather. The coverage and intensity of the land breeze convergence line is significantly less than those of the sea breeze. The orogra

关键词： Hainan Island sea-land breeze statistical characteristics WRF numerical simulation

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Influence of Engine Cabin Simplification on Aerodynamic Characteristics of Car

Influence of Engine Cabin Simplification on Aerodynamic Char...

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2014 3rd International Conference on key Engineering Materials and Computer Science(KEMCS 2014)

作者： Xingjun Hu Jing Chang State Key Lab of Automobile Simulation and Control Jilin University

In order to analyze the impact of engine cabin parts on aerodynamic characteristics, the related parts are divided into three categories except the engine cooling components: front thin plates(average thickness of 2mm), bottom-suspension and interior panels. The aerodynamic drag coefficient(Cd) were obtained upon the combination schemes consisting of the three types of parts by numerical simulation. Results show that Cd by simulation is closer to the test value gained by the wind tunnel experiment when front thin plates were simplified to the two-dimensional interface with zero thickness. The error is only 5.23%. Meanwhile this scheme reduces grid numbers, thus decreasing the calculating time. As the front thin plates can guide the flow, there is no difference on the Cd values gained from the model with or without bottom-suspension or interior panels when the engine cabin contains the front thin plates;while only both bottom-suspension and interior panels are removed, the Cd value can be reduced when the cabin doesn't contain the front thin plates.

关键词： Simplification of engine cabin Aerodynamic characteristics Numerical simulation Baffle

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