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Analytical prediction of parasitic capacitance and crosstalk in automotive cable bundles

Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) 2011年第SUPPL. 1期41卷 144-149页

作者： Gao, Yin-Han Wang, Rui-Bao Ma, Yu-Gang Wang, Ying-Ying Yang, Kai-Yu State Key Laboratory of Automobile Simulation and Control Jilin University Changchun 130022 China College of Instrumentation and Electrical Engineering Jilin University Changchun 130022 China Unit 92571 of PLA Sanya 572021 China College of Physics Jilin University Changchun 130022 China Second Secondary School Changchun Changchun 130051 China

The space full of inhomogeneous media was turned into the infinite space full of homogeneous media using the method of image, and the relation between the bound charges and the free charges on the conductors inside the homogeneous media on the basis of the theory of electromagnetic field, then the analytical model of the per unit length parasitic parameter of insulated conductors in cable bundles was derived and the relevant crosstalk was also estimated. The results of p. u. l parasitic parameter and the crosstalk from the analytical model compared the results from the EMC Studio software. It was turn out that the analytical model was valid. The analytical model was simple, convenient and it can provide a rapid prediction about parasitic parameter and crosstalk of conductor ensure the problem will not be missed especially in the early stage of design absence of complete system information. The analytical model was fit for deterministic and stochastic harness geometry.

关键词： Crosstalk

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Preparation of activated carbon from cattail and its application for dyes removal

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Journal of Environmental Sciences 2010年第1期22卷 91-97页

作者： Qianqian Shi Jian Zhang Chenglu Zhang Cong Li Bo Zhang Weiwei Hu Jingtao Xu Ran Zhao School of Environmental Science and Engineering Shandong University Jinan 250100 China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing 100871 China

Activated carbon was prepared from cattail by H3PO4 activation. The effects influencing the surface area of the resulting activated carbon followed the sequence of activated temperature 〉 activated time 〉 impregnation ratio 〉 impregnation time. The optimum condition was found at an impregnation ratio of 2.5, an impregnation time of 9 hr, an activated temperature of 500℃, and an activated time of 80 min. The Brunauer-Emmett-Teller surface area and average pore size of the activated carbon were 1279 m^2/g and 5.585 nm, respectively. A heterogeneous structure in terms of both size and shape was highly developed and widely distributed on the carbon surface. Some groups containing oxygen and phosphorus were formed, and the carboxyl group was the major oxygen-containing functional group. An isotherm equilibrium study was carried out to investigate the adsorption capacity of the activated carbon. The data fit the Langmuir isotherm equation, with maximum monolayer adsorption capacities of 192.30 mg/g for Neutral Red and 196.08 mg/g for Malachite Green. Dye-exhausted carbon could be regenerated effectively by thermal treatment. The results indicated that cattail-derived activated carbon was a promising adsorbent for the removal of cationic dyes from aqueous solutions.

关键词： cattail activated carbon H3PO4 activation dyes removal regeneration

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RETRACTED ARTICLE: Suspension K&C characteristics and the effect on vehicle steering

RETRACTED ARTICLE: Suspension K&C characteristics and the ef...

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作者： Jiansen, Yang Konghui, Guo Haitao, Ding Jianwei, Zhang Shuang, Cao State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun China Changchun Institute of Engineering Technology Changchun China

ISBN: (纸本)9781424479566

This paper investigates the effect of suspension kinematics and compliance (K&C) characteristics on vehicle steering characteristics. The model is built via CarSim and verified by experimental data. Based on our previous research and engineering experience, the suspension K&C characteristics and their characteristic parameters are summarized. Several important characteristic parameters are selected as factors and their levels are made. The orthogonal method is employed for the simulation and analysis. The steady-state circular test, the steering wheel angle step input test, and the steering wheel impulse input test are performed in the simulation. Furthermore, the influence sequence of those characteristic parameters on the understeer, yaw response time and harmonic peak frequency are studied. Finally, the sensitivity of suspension K&C characteristics on the vehicle steering is derived. © 2010 IEEE.

关键词： Steering

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A modeling approach for development of an automotive AMT ECU software with UML-RT

A modeling approach for development of an automotive AMT ECU...

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2nd International Conference on Software Engineering and Data Mining, SEDM 2010

作者： Liu, Hongbo Lei, Yulong Zhang, Jianguo State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun China Changchun Institute of Engineering Technology Changchun China

ISBN: (纸本)9788988678213

Over the past decades, the amount of automotive ECUs (Electronic control Units) is increasing at a breathtaking pace. Accordingly, the size and complexity of ECU software also increased, and these give rise to various challenges to automotive software engineers. They need a new approach and tools to meet these challenges. Model-Based development is a choice. This paper presents a model-based design approach for the development of AMT (Automated Manual Transmission) ECU software using UML-RT language in automotive domain. UML-RT is a modeling language tailored to the demands of real-time software. The paper shows the methods and process on modeling functional and architectural model using UML-RT key diagram. Conclusions are drawn on how these models helps the different developers visualize, construct, and discuss together the structure and behavior of software's architecture.

关键词： Modeling languages

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Experimental study on anti-vibration of EPS

Experimental study on anti-vibration of EPS

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2010 International Conference on Computer, Mechatronics, control and Electronic Engineering, CMCE 2010

作者： Zhaojian, Wang Konghui, Guo Jianwei, Zhang Haitao, Ding Shuang, Cao State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun China Changchun Institute of Engineering Technology Changchun China

ISBN: (纸本)9781424479566

In this paper, we study the bench test for an electrical power steering system (EPS), and develop the controller, the motor driver, and the software for the EPS. Based on the investigation on the regular assistant algorithm, we summarize the difficulties and problems encountered by the regular algorithm. After that, in order to improve the performance of anti-vibration and the human-like steering feeling, we propose a new assistant strategy for the EPS. The experiment results of the bench test illustrate the effectiveness and flexibility of the proposed control strategy. © 2010 IEEE.

关键词： Software testing

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Experimental modeling of magneto-rheological damper and PID neural network controller design

Experimental modeling of magneto-rheological damper and PID ...

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International Conference on Natural Computation

作者： Liu, Wei Shi, Wen-Ku Liu, Da-Wei Yan, Tian-Yi State Key Laboratory of Automobile Dynamical Simulation Jilin University Jilin Changchun 130025 China Automobile Engineering Department Qingdao University Qingdao 266071 Shandong China

ISBN: (纸本)9781424459612

MR fluid is a material that responds to an applied magnetic field with a significant change in its rheological behavior. With the outstanding features of MR fluid, MR dampers are a new class of devices that more suitable for the requirements of automotive applications, including having very low power requirements. Using a large number of test data, a phenomenological model based on the Bouc-Wen hysteresis model was adopted to predict both the force-displacement behavior and the complex nonlinear force-velocity response. For the purpose of developing semi-active controller, the theory of PID neural network control is adopted here to identify and control the semi-active suspension systems. The result showed that, under the control of the PID neural network controller, the MR damper could reduce the acceleration in varied ride conditions. The primary goal of this paper is to create a reliable, effective and safe semi-active suspension controller that improves the ride comfort as well as safety of automotive performance. © 2010 IEEE.

关键词： controllers

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Parallel real-time simulation of integrated power system with multi-phase machines based on component partitioning

Parallel real-time simulation of integrated power system wit...

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2010 International Conference on Power System Technology: Technological Innovations Making Power Grid Smarter, POWERCON2010

作者： Xu, Yin Chen, Ying Chen, Laijun Gong, Yuan Department of Electrical Engineering State Key Laboratory of Control and Simulation Tsinghua University 100084 Beijing China

ISBN: (纸本)9781424459407

This paper presents a parallel algorithm for real-time simulation of the electromagnetic transient dynamics of the integrated power systems, which contains multi-phase machines and converters. The proposed algorithm is base on the component partitioning and Multiarea Thevenin Equivalent (MATE) methods. By partitioning the computational model of the multi-phase machine into several parts, a decomposition and coordination computation schema is designed. Moreover, with the help of the component partitioning, the overall system can be partitioned more flexibly and balanced, which helps to enhance the efficiency of the MATE methods eventually. Base on the proposed algorithm, a parallel simulation platform is constructed on a multi-core computer using OpenMP programs. Test results of a typical Integrated Power System (IPS) on ships verify the accuracy and efficiency of the proposed algorithm as well as prove the feasibility of applying the multi-core techniques to realize high performance power system simulations. ©2010 IEEE.

关键词： Parallel algorithms

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A novel algorithm for parallel electromagnetic transient simulation of power systems with switching events

A novel algorithm for parallel electromagnetic transient sim...

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2010 International Conference on Power System Technology: Technological Innovations Making Power Grid Smarter, POWERCON2010

作者： Chen, Laijun Chen, Ying Xu, Yin Gong, Yuan Department of Electrical Engineering State Key Laboratory of Control and Simulation Tsinghua University 100084 Beijing China

ISBN: (纸本)9781424459407

The electromagnetic transient simulation of power system with many switching events is very time-consuming due to the huge increment of computation caused by frequent changing system topologies. To speedup the parallel simulations of the power systems with switch events, a novel algorithm based on the Multi Area Thevenin Equivalent (MATE) and the flexible half-step interpolation method is proposed. Through runtime caching of the matrixes corresponding to the topology changes, the repeated matrix operations are eliminated for both the subsystem and coordinator sides, while the communication costs for the parallel simulations are also reduced significantly. Moreover, a parallel simulation platform is developed based on the multi-core computation environment and MPI functions. On this platform, the accuracy and efficiency of the proposed algorithm are verified by the real-time simulations of a power system containing four 3-phase rectifiers and three 5-phase PWM inverters. ©2010 IEEE.

关键词： Topology

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RETRACTED ARTICLE: Analysis on influence of suspension compliance characteristics by unsymmetrical rubber bushing

RETRACTED ARTICLE: Analysis on influence of suspension compl...

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作者： Ji, Peng Lu, Pingping Hai, Chenguang Hebei University of Engineering Handan 056001 China State Key Laboratory of Automobile Dynamics Simulation Jilin University Changchun 130025 China

ISBN: (纸本)9781424463503

In order to improve the handling stability of the vehicle, many unsymmetrical rubber bushing are carried into the connection between suspension and vehicle body. Compared with the traditional rubber bushing, the unsymmetrical rubber bushing can make suspension acquire reasonable characteristics by not only changing its material attribute, but also adjusting the fixing orientation. The universal and adaptive of rubber bushing are advanced. The model of unsymmetrical rubber bushing is established and carried to analyze its influence on Suspension Characteristics by simulation. The results can provide valuable advice for matching suspension characteristic in reasonable way. © 2010 IEEE.

关键词： Bushings

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The integrated controller of the steering /braking stability for the vehicles

The integrated controller of the steering /braking stability...

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International Conference on Computer, Mechatronics, control and Electronic Engineering

作者： Li, Guo Liu, Huawei Wang, Xu State Key Laboratory of Automobile Dynamic Simulation Changchun China Information Engineering School University of Science and Technology in Beijing Beijing China

ISBN: (纸本)9781424479566

Firstly, with the blackboard rulers the steering system and wheels get their coordinated control tasks based on their own states and the vehicle's state. It can adjust desired commands and control paraments of the servo controllers to realize the vehicle's steering antilock brake stability. The force distribution strategy suitable for complex conditions is designed. Secondly, it realizes the servo control of the vehicles with the optimum slide mode control method, and studies on it's application methods to the vehicle's longitudinal and lateral servo-system to track the desired input commands robustly. Finally, the validity of the robust adaptive control algorithm are validated by simulation results. © 2010 IEEE.

关键词： Integrated control

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