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development and Implementation of an Electro-hydraulic Variable Valve Actuation System to a Homogeneous Charge Compression Ignition Engine

Development and Implementation of an Electro-hydraulic Varia...

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中国内燃机学会燃烧节能净化分会2011年学术年会暨973项目年度工作会议

作者： H Li Y-K Wang Y-H Gu E-W Jiang X Wang Y-N Guo State Key Laboratory of Automobile Simulation and Control Jilin University Changchun People’s Rep Engine Design Department R&D Center China FAW Group Corporation Changchun People’s Republic of C

A new type electro-hydraulic variable valve actuation (VVA) system is developed to realize homogeneous charge compression ignition (HCCI) combustion with different exhaust gas recirculation (EGr) strategies on a low speed single cylinder research engine. Power supply pressures and hydraulic piston geometries of the VVA system were firstly determined. Main orifice diameters for fluid charge and discharge were numerically studied with AMEsim software to figure out their optimal values. A damper system and a multi-discharge-orifice mechanism were designed to provide better solutions for actuator braking and for valve seating velocity reduction, respectively. Bench tests indicated that this system was capable to achieve flexible valve motions, such as variable valve timing, duration and lift, with dramatically improved valve lift overshoot and effectively reduced valve seating velocity at the full range of research engine speed. Experiment results revealed that this VVA system could be used to realize robust HCCI combustion by means of different EGr strategies.

关键词： variable valve actuation homogeneous charge compression ignition exhaust gas recirculation damper system multi-discharge-orifice mechanism

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Strength improvement design of engine rubber mount based on finite element method

Strength improvement design of engine rubber mount based on ...

引用

International Conference on Environmental Science and Information Application Technology, ESIAT

作者： Wan Jiang Wen-ku Shi Teng Teng Qing-guo Wang State Key Laboratory of Automobile Dynamical Simulation Jilin University Changchun China R & D Center FAW Group Corporation Changchun China R&D Center FAW Group Corporation Changchun China

To solve the rubber tearing problem at the rubber-metal interface of some vehicle engine rubber mount, the mount's finite element (FE) model was built. The simulation was carried out by ABAQUS. Material constants were gained from stress-strain test data. CATIA and Hypermesh were also applied during modeling process. The simulation results were consistent well with the test data on vertical stiffness. The results show that: most rubber stress extrema appear near rubber-metal interfaces; especially stress-raisers were at corners of supporting faces. Various improved structures of the mount model were carried out. It's found that increasing taper angle enhances the strength of rubber mount, while thickness influences its strength, too. The scheme with better stress state as well as meeting the stiffness and layout requirements was choozen as resolution. It has certain reference significance for research and development of the same kind rubber mount.

关键词： rubber Engines Isolators Analytical models

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Vehicle Lateral and Longitudinal Velocity Estimation Based on Unscented Kalman Filter 2nd

Vehicle Lateral and Longitudinal Velocity Estimation Based o...

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2010 2nd International Conference on Education Technology and Computer(第二届IEEE教育技术与计算机国际会议 ICETC 2010)

作者： Liang Chu Yanru Shi Mingfa Xu Yongsheng Zhang Minghui Liu Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun China R&D Center FAW group corporation of China Changchun China

ISBN: (纸本)9781424463671;9781424463688;9781424463701

Vehicle lateral velocity (vy) and longitudinal velocity (vx) play an important role in modern vehicle active safety control *** using sensors to measure vy and vx are very expensive,it is necessary to estimate vy and vx from other variables measured easily. In this paper,a novel estimation method for vy and vx is *** method is based on Unscented Kalman Filter (UKF) from steering angle,yaw rate and acceleration,which can be measured easily and cheaply by sensors. This method was evaluated under a variety of maneuvers and road *** simulation results demonstrated that the proposed method was robust and even if condition changed,this method could still estimate vy and vx accurately.

关键词： Lateral Velocity Longitudinal velocity Unscented Kalman Filter dugofftire model

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Transient Current Burst Analysis induced in Cable Harness due to direct Lightning Strike on Aircraft

Transient Current Burst Analysis induced in Cable Harness du...

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Asia-Pacific International Symposium on Electromagnetic Compatibility

作者： Min ZHANG Zhiyong HUANG TONGJI UNIVERSITY Modern Integrated Electromagnetic Simulation R&D Center (MEMS) School of Electronics and Information Engineering

ISBN: (纸本)9781424456215

Lightning is a destructive natural phenomenon. The interaction of lightning with an aircraft brings out intense current on aircraft surface and induces peak current in the onboard wire harness, which can cause damage or malfunction to critical electronic equipment, thus compromising the flight safety. This article analyzes the characteristic of direct lightning strike based on the MIL-STd-464A standard and simulates the surface current density, electric field strength and induced current in cable harness using CST MICrOSTrIPES (CST MS). The simulation result shows that the aluminum aircraft skin can provide a good protection against lightning.

关键词： Lightning strike on aircraft Surface current density Electric field strength Induced current in cable

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Finite element analysis of the static and dynamic characteristics of engine rubber mount

Finite element analysis of the static and dynamic characteri...

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Pacific-Asia Workshop on Computational Intelligence and Industrial Application, PACIIA

作者： Wen-ku Shi Zhi-yong Chen Hao Ya Teng Teng State key laboratory of automobile dynamic simulation Jilin University Changchun China FAW group corporation R&D center Changchun China

The tests date to characterize the rubber material constants as well as the hyperelastic material stability is discussed. The rubber material of engine mount is analyzed based on different forms of strain energy potentials using finite element analysis software ABAQUS. The method of using test data to calibrate material coefficients is obtained. Both of the hyperelastic constitutive law and the viscoelasticity constitutive law of rubber material are used in the dynamic analysis. The simulation of the rubber mount static and dynamic characteristic agrees well with experimental results.

关键词： Finite element methods Engines rubber Materials testing Capacitive sensors Vehicle dynamics Automotive materials Software testing Potential energy Polynomials

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Application of CST Time domain Algorithm in the Electromagnetic simulation Standard of the SAr for Mobile Phone

Application of CST Time Domain Algorithm in the Electromagne...

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2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)

作者： Nan QI Min ZHANG Tilmann WITTIG Alexander PrOKOP TONGJI UNIVERSITY Modem Integrated Electromagnetic Simulation R&D Center (MIEMS)4800 Cao'an RoadJiading DistrictShanghai 201804China

SAr is one of the important reference values in evaluation of electromagnetic radiation from mobile phones. The purpose of this paper is to present the SAr simulation results of a mobile phone,SAM head,and hand with ... 详细信息

关键词： SAr IEEE SAr Standards mobile phone SAM

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simulation design of Four-Arm Cavity Backed dielectric Loaded UWB Spiral Antenna

Simulation Design of Four-Arm Cavity Backed Dielectric Loade...

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2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)

作者： Hongli WANG Min ZHANG TONGJI UNIVERSITY Modern Integrated Electromagnetic Simulation R&D Center (MIEMS)4800 Cao'an RoadJiading DistrictShanghai 201804China

This article analyses a novel 4-arm spiral antenna operating in the 2nd mode. The CST MICrOWAVE STUdIO(r) (CST MWS) is extensively used to study effects of various antenna parameters. Good performance over four octave bandwidth is achieved in terms of angular phase linearity,axial ratio,and Wobble on wave (WOW). The total cumulative phase is 720 degrees for mode 2 pattern at the assigned elevation. Phase linearity over the entire bandwidth is well maintained. The standard deviation of phase is controlled within design requirement.

关键词： UWB antenna angular phase Unearity axial ratio

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Comparison of Various Full-Wave Methods in Calculating the rCS of Inlet

Comparison of Various Full-Wave Methods in Calculating the R...

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2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)

作者： dachuan YU Min ZHANG TONGJI UNIVERSITY Modern Integrated Electromagnetic Simulation R&D Center (MIEMS)4800 Cao'an RoadJi Correspondent Author: Prof.Dr.-Ing.Min ZHANG School of Electronic and Information EngineeringTongji

radar Cross Section (rCS) is a very important measureInthe field of radar stealth and radar *** full-wave simulation methods are introduced in this paper,and the rCS of an S-shaped inlet is calculated respectively using these methods implantedInthe commercial software CST MICrOWAVE STUdIO(r) (CST MWS). The calculated results in CST MWS areInagreement with the measurement. Finally,these methods,which are comparedInterms of accuracy,memory requirements and CPU time,are discussed with respect to the advantages and limitations in calculating the rCS of electrically large concave structures.

关键词： rCS full wave EM algorithm airplane inlet

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A novel efficient algorithm for surface mesh segmentation

A novel efficient algorithm for surface mesh segmentation

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2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)

作者： Hongli WANG Junhe ZHOU Min ZHANG TONGJI UNIVERSITY Modern Integrated Electromagnetic Simulation R&D Center (MIEMS)4800 Cao'an RoadJi Correspondent Author: Prof.Dr.-Ing.Min ZHANG School of Electronic and Information EngineeringTongji

In this paper,we propose a novel pointIntrianglemesh polyhedron algorithm,which is based on the Jordan theorem,for surface mesh segmentation. The algorithm tried to find whether there is intersection between the radial initiating from the point and the triangle by judging whether the point is inside a tetrahedron. The pointIntetrahedron algorithm could be efficient by simply comparing the volume of the tetrahedron and summation of the volumes of the four small *** efficiency of the algorithm is greatly improved in comparison with the simple Jordan algorithm.

关键词： research and development Computer science Computer graphics Computational electromagnetics read-write memory distributed decision making Computer applications Application software Computational modeling Computer simulation

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Time-domain versus Frequency-domain Approach for an Accurate simulation of Phased Arrays

Time-Domain versus Frequency-Domain Approach for an Accurate...

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2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)

作者： Jian CUI Min ZHANG TONGJI UNIVERSITY Modern Integrated Electromagnetic Simulation R&D Center (MIEMS)4800 Cao'an RoadJi Correspondent Author: Prof.Dr.-Ing.Min ZHANG School of Electronic and Information EngineeringTongji

In This paper,a general comparison is presented between time-domain and frequency-domain simulation schemes of phased arrays.A series of vivaldi arrays are simulated with Finite Integral Time-domain(FITd) and frequency-domain finite element method (FEM)Interms of its far field characteristic like radiation pattern and gain. Three finite arrays of 10 by 10,20 by 20,and 30 by 30 are simulated using FITd. The results are compared with that of the same arrays by linear combination of a unit Vivaidi antenna simulated with FEM. It is concluded that for small arrays time domain is more accurate while for large ones frequency domain method is more superiorInterms of computer time and memory.

关键词： time-domain frequency-domain simulationapproach phased arrays mutual coupling.

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