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9th International Conference of Chinese Transportation Professionals, ICCTP 2009: Critical Issues in Transportation System Planning, Development, and Management

作者： Han, Y. Wang, H. State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing 100084 China School of Automobile Chang'an University Xi'an 710064 China School of Electronic and Control Engineering Chang'an University Xi'an 710064 China

ISBN: (纸本)9780784410646

Precision Level is widely used to measure road elevation. The measuring process needs several cooperating people to complete. The measuring error is not easily to be controlled due to the artificial influence. A wavy road elevation measurement method is proposed in this paper based on the principle of inertia. This equipment mainly consists of a gyro, a three-axis accelerometer and a photoelectric encoder. When moving on the road at a high speed, it can real-timely measure the running speed and the pitch angle of the car, from which the road elevation can be obtained by data processing. The advantage of this method is simple, high speed and easy to achieve, it can be applied to measure the wavy road elevation. © 2009 ASCE.

关键词： Data handling

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Power load modeling based on wide-area measurements and support vector machine

Power load modeling based on wide-area measurements and supp...

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2009 Asia-Pacific Power and Energy Engineering Conference, APPEEC 2009

作者： Wang, Zhenshu Li, Linchuan Niu, Li Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China School of Electrical Engineering Shandong University Jinan China State Nuclear Electric Power Design and Research Institute Beijing China

ISBN: (纸本)9781424424870

At present, the load modeling is still one of the difficult problems in power system. In this paper, a new method is presented which uses wide-area measurements and support vector machine (SVM) for load modeling. Based on wide-area measurements, this method does non-linear regression analysis on model with SVM. By using radial basis function (RBF), model structure is optimized, and Bayesian Framework is used for identifying parameters, then a kind of non-mechanical model is founded. This method can easily solve the problems in choosing structure and identifying parameters. The founded model has good generalization ability, flexible structure, and rapid calculation speed. In the end, this method has been programmed;the simulation verifies the validity of this model. © 2009 IEEE.

关键词： Support vector machines

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Finite element modal analysis for a light bus

Finite element modal analysis for a light bus

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

作者： Wen-ku Shi Zhi-yong Chen Fu-xiang Guo Zhi-hong Shen State key laboratory of automobile dynamic simulation Jilin University Changchun China Nanjing IVECO Motor Company LTD Nanjing China

The finite element model of a light bus body is established. The vibration modalities are evaluated using finite element software. The simulated results are compared with test date. It shows that the model has represented the vibration characteristics of the original structure. The finite element model for the acoustic cavity is established. The first step modality in the longitudinal direction of the acoustic cavity is evaluated. All of the modalities include body; frame and cavity acoustics are analyzed and discussed.

关键词： Finite element methods Modal analysis Rubber automobiles Springs Seals Welding Analytical models Solids Acoustic beams

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Fault tolerant control method for steer-by-wire system

Fault tolerant control method for steer-by-wire system

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IEEE International Conference on Mechatronics and Automation

作者： Chengwei Tian Changfu Zong Lei He Xiang Wang Yiliang Dong State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun Jilin Province China Institute of Automotive Engineering Changan Automobile Holding Ltd. Chongqing China

In this study, we describe a model based fault tolerant control method for steer-by-wire system. First of all general redundancy schemes and current works for steer-by-wire fault tolerant control systems are examined. Then the paper focuses on the fault tolerant control methods of key sensors and DC motors for steer-by-wire system. With the aim to provide a steady and reliable fault tolerant control algorithm we synthesize Adaptive Fading Kalman Filter and fault eigenvectors as a framework to establish the fault tolerant control system. The effectiveness of this research is demonstrated by simulation. Finally key innovations of the fault tolerant control method are discussed.

关键词： Fault tolerant systems control systems control system synthesis Redundancy Sensor systems DC motors Programmable control Adaptive control Fading Technological innovation

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The integrated chassis control based on the hydraulic brake pressure fine regulation

The integrated chassis control based on the hydraulic brake ...

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IEEE Symposium on Intelligent Vehicle

作者： Bing Zhu Jian Zhao You-de Li Xin Hua State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun China Department of Mechanical Engineering University of Kentucky Lexington USA

ISBN: (纸本)9781424435036

An integrated chassis control (ICC) system is introduced in this paper by the integration of the active front steering and brake systems based on the fine regulation method of the hydraulic brake pressure. A novel and effective brake controller has been designed to work without pressure feedback. The design is based on theoretical analysis and experimental research on hydraulic brake system while pulse width modulation is used in the pressurization process and the pulse frequency modulation is used to allow the pressure to drop. The ICC controller is designed by using the multivariable frequency domain control theory: it gets compensation in both high-frequency band and low-frequency band. A single lane change test was simulated on a co-simulation platform with both MATLAB and AMESim software. Results show that the controller can effectively regulate the brake force and improve the maneuverability and stability of vehicles dramatically.

关键词： Pressure control Space vector pulse width modulation Pulse width modulation control systems Feedback Frequency modulation Frequency domain analysis control theory Software testing MATLAB

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Shaft crack analysis and diagnosis for the 600mw steam turbine generator

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key Engineering Materials 2009年 413-414卷 591-598页

作者： Dongxiang, Jiang Liangyou, Hong Qian, Huang State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal Engineering Tsinghua University Beijing 100084 China

Abstract: In order to find the cause of the shaft crack appeared in a 600MW steam turbine generator, several measurements are taken. The shaft assembly consists of three parts: shrink-fitted coupling, shaft and key which are used to transfer torque between coupling and shaft. First, the natural frequency of the shaft system is calculated. The result shows that the vibration signal contains the frequency nears the second natural frequency of the steam turbine shaft system. Second, stress field near the damaged coupling and shaft is analyzed using finite element method. The torque under different operation condition is calculated before stress analysis and applied to the shaft assembly, then. And, local stress concentrations position calculated is proved to be coincident with the place crack initiation. Finally, the cause of the fault is analyzed: at least three causes have found to be having something to do with the crack fault.

关键词： Finite element method

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Finite element analysis of an air spring concerning initial pressure and parameters of cord fabric layer

Finite element analysis of an air spring concerning initial ...

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

作者： Shi Wenku Jiang Wan Huang Ying Yao Weimin Ya Hao Liu Zubin State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun China FAW Group Corporation Research and Development Center Changchun China

A finite element analysis (FEA) model of an air spring was carried out with the software ABAQUS to study the influence of cord fabric layer parameters on the elastic characteristic of air spring. The FEA model was builded and meshed meanwhile by writing program file. The cord fabric was simulated by rebar element. The compressed gas in the cavity of air spring was represented by the hydrostatic fluid element. Results of simulation coincide well with the experimental data gathered by the MTS831 elastic component testing system. The static elastic characteristic of air spring was simulated under different parameters to ascertain the initial pressure and cord fabric Parameters'impact, utilizing sensitivity analysis method. The study reveals that: the cord angle and cord interval influence the elastic characteristics of air spring relatively more and can both be adjusted easily; cord cross section area and layer number have certain impact on air spring elastic characteristics however their adjusts might influence the robustness and distorting pattern of whole structure; considering the robustness of air bag, the initial pressure should not vary too much. The conclusion has certain referencing significance for the design and optimizing of air spring of the same kind.

关键词： Finite element methods Springs Fabrics Vehicle dynamics Analytical models Sensitivity analysis Robustness Design optimization Vehicle safety Mathematical model

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Nonlinear Model Predictive control for Idle Speed control of SI Engine

Nonlinear Model Predictive Control for Idle Speed Control of...

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Joint 48th IEEE Conference on Decision and control and 28th Chinese control Conference

作者： Shu Li Hong Chen Shuyou Yu State Key Laboratory of Automobile Dynamic Simulation Jilin University the Department of Control Science and Engineering Jilin University(Campus Nanling) the Air Force Aviation University IEEE the Department of Control Science and Engineering Jilin University (Campus Nanling)

The idle speed control is one of the most generic and basic automotive control problems. In this paper, the engine idle speed control problem comes down to optimization problem with input and state constraints. The controller based the quasiinfinite horizon nonlinear model predictive control(NMPC)methodology is designed to regulate the engine speed as close as possible to a reference value. The simulation results show that the controller can improve the dynamic performance of system and good control effect can be obtained as well as satisfying the system constraints.

关键词： Engine idle speed control system constraints nonlinear model predictive control terminal region

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Time Series Analysis on Ecological Competitive Capacity of Beijing Using Emergy Synthesis

Time Series Analysis on Ecological Competitive Capacity of B...

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International Conference on Management and Service Science, MASS

作者： Lixiao Zhang Zhifeng Yang State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing China

An emergy-based analysis was conducted to investigate evolvement of the ecological competitive capacity of Beijing with regard to urban evolution and city development from 1990 to 2005. A newly integrated indicator, ecological competitive capacity index (ECCI) was established by combing conventional emergy indices of percentage of local renewable resource, emergy self-sufficient ratio, emergy/money ratio and waste emergy ratio, to reflect the overall performance of urban system with respect to their long term sustainability. The result shows that the intensity, structure, efficiency and their environmental impact associated with urban emergy use have exhibited diversified changing tendency. However, the ECCI has decreased with fluctuation from 1990 to 1999, but remains relative stable after 1999. The maximum vale of 1 can be found in 1991 while the minimum value of 0 in 1997 among the concerned years. How to enhance the urban ecological capacity and strengthen the capability of sustainable development is an urgent issue confronted by large cities as Beijing.

关键词： Time series analysis Cities and towns Power generation economics Environmental economics Ecosystems Biological system modeling Analytical models Pollution control Fluctuations Sustainable development

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Optimizing the Structures of Reclaimed Land Use in Coal Mining Area

Optimizing the Structures of Reclaimed Land Use in Coal Mini...

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The 3rd International Conference on Bioinformatics and Biomedical Engineering(iCBBE 2009)(第三届生物信息与生物医学工程国际会议)

作者： Linyu Xu Huimin Song Wei Jin State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University BeijingChina

Implementating land reclamation forms a pivotal point for ecological restoration in coal mining area. Based on the analysis of a collection of factors including investment, benefit, employment, production and living demand, this paper adopt linear programming technique to optimize the structures of land reclamation in Banji coal mining area, China. The results indicate that the land reclamation for the purpose of fishing ponds, grain supplies, fruit gardens, feed supplies and services are optimized under constraint of fix capital stock. This approach needs investment of 48.053 million and resolves employment of 2909 persons. Maximum annual net revenue is 29.3 million and the turnover period of investment is 5.2 years with a compound interest of 10％.

关键词： land reclamation land use linear programming coal mining area

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