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Integrated control of braking and steering for vehicle stability considering the parametric uncertainties and input constraints

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International Journal of Vehicle Autonomous Systems 2008年第3-4期6卷 251-275页

作者： Yang, Xiujian Wang, Zengcai State Key Laboratory of Automobile Dynamic Simulation Jilin University No. 5988 Renmin Street Changchun City 130025 China Vehicular Institute School of Mechanical Engineering Shandong University No. 73 Jingshi Road Jinan City 250061 China Vehicle Dynamics and Control China Shandong University China School of Mechanical Engineering Shandong University China Vehicular Institute China

A vehicle dynamics controller is designed to improve vehicle handling and stability by coordinating Active Front Steering (AFS) and differential braking with the consideration of input constraints. An uncertain integrated control model is constructed by choosing the tyre cornering stiffness and longitudinal velocity as the uncertainties. A state feedback integrated controller based on Optimal Guaranteed Cost with input Constraints (OGCC) is developed which can not only attenuate the influence of the modelling uncertainties on vehicle dynamics but also reduce the possibility of actuators' saturation. simulations on an 8-DOF nonlinear vehicle model demonstrate the satisfying performance of the OGCC scheme. Copyright © 2008 Inderscience Enterprises Ltd.

关键词： Integrated control

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Algal-bloom control by allelopathy of aquatic macrophytes—A review

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Frontiers of Environmental Science & Engineering 2008年第4期2卷 421-438页

作者： Hongying HU Yu HONG Environmental Simulation and Pollution Control State Key Joint Laboratory Department of Environmental Science and EngineeringTsinghua UniversityBeijing 100084China College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083China

Algal-bloom control is an important issue for water environment protection as it induces several negative impacts on the lives of aquatic organisms,aquaculture,landscaping,and human *** development of an environment-friendly,cost-effective,and convenient alternative for controlling algal bloom has gained much *** the allelopathy of aquatic macrophytes as a novel and safe method for algal-bloom control is a promising *** paper reviews the development and potential application about allelopathy of aquatic plants on algae,including the allelopathic research history,the potential research problems,the research methodology,and the reported aquatic macrophytes and their inhibitory *** modes of inhibition action of allelochemicals on algae,possible ways for application,and future development directions of research on algal-bloom control by aquatic macrophytes were also presented.

关键词： allelopathy allelochemical aquatic macrophyte algae algal bloom

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Ecological effects of lawn greens with pure and mixed stands in an urban setting

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中国高等学校学术文摘·林学 2008年第4期3卷 440-448页

作者： Jiaomei LIU Shuhua LI Zhiguo ZHANG State Key Union Laboratory for Environmental Simulation and Contamination Control Beijing Normal University Beijing 100875 China Department of Horticulture and Landscape Architecture China Agricultural University Beijing 100094 China

We studied the ecological benefits of four types of urban green spaces (lawn, a Robinia pseudoacacia stand, a Pinus tabulaeformis stand and a mixed stand of both species) in Yuan Dynasty Wall Relics Park, Beijing. Each of the eight sampling sites was about 0.1 hm2. The experiment was carried out in June, 2006 over a period of eight consecutive days, during which we continuously measured air temperature, relative humidity (RH) and wind speed at the four green spaces in both horizontal and vertical directions. The results were as follows: in the horizontal direction, the all-day average temperature at the pine stand was the lowest and its RH was the highest under three different climate conditions. During the day-time high temperature period, the temperature of the lawn was the highest and its RH the lowest. The temperature was lowest for the mixed stand, and the RH was highest for the pine stand. The highest average daily temperature occurred in the locust stand. The temperature and RH of the four green spaces were statistically different at the 0.05 level of significance. In the vertical direction, the average daily temperature of the four green spaces increased with height. The average daily RH of the four-green spaces decreased slightly with increased height. During the high temperature period of the day, the average temperature of the lawn and the P. tabulaeformis stand declined with the increased height, but the temperature at the R. pseudoa-caeia stand and the mixed P. tabulaeformis-R, pseudoaca-cia stand fluctuated greatly. With regard to the effect of lowering the wind speed, the mixed stand was better than the other green spaces. Based on these results, it can be concluded that the mixed Chinese pine and locust stand was the best choice for the establishment of urban green spaces.

关键词： urban green space mixed stand ecological benefits temperature relative humidity wind speed

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Environmental evaluation of vehicle cruise control

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) 2008年第SUPPL.期38卷 28-31页

作者： Li, Xiang-Yu Gao, Zhen-Hai Yuan, Chang-Bi Qiao, Yan-Juan State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun 130022 China Chang'an Automobile Holding Ltd. Automotive Engineering Institute Chongqing 401120 China

A vehicle longitudinal dynamics model including a vehicle emission submodel was established by the quantitative analysis of the effects of the vehicle cruise control on reducing the fuel consumption and emission pollutants, and a new adaptive fuzzy PID control algorithm of vehicle cruise control was suggested based on the traditional cruise fuzzy controller. With these two control algorithms, the vehicle fuel consumption and exhaust emissions of CO, HC, and NOx were compared under the typical cruise conditions. Therefore, the effects of the vehicle cruise control system on the vehicle emissions can be analyzed quantitatively instead of qualitatively, and a new evaluation method was provided to the optimization of the vehicle cruise control algorithm.

关键词： Vehicles

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Enhanced atrazine removal using membrane bioreactor bioaugmented with genetically engineered microorganism

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Frontiers of Environmental Science & Engineering 2008年第4期2卷 452-460页

作者： Chun LIU Xia HUANG State Key Joint Laboratory of Environmental Simulation and Pollution Control Department of Environmental Science and EngineeringTsinghua UniversityBeijing 100084China School of Environmental Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China

Bioaugmentation with genetically engineered microorganisms(GEMs)in a membrane bioreactor(MBR)for enhanced removal of recalcitrant pollutants was *** atrazine-degrading genetically engineered microorganism(GEM)with green fluorescent protein was inoculated into an MBR and the effects of such a bioaugmentation strategy on atrazine removal were *** results show that atrazine removal was improved greatly in the bioaugmented MBR compared with a control *** a start-up period of 6 days,average 94.7%of atrazine was removed in bioaugmentedMBRwhen atrazine concentration of influent was 14.5 mg/*** volumetric removal rates increased linearly followed by atrazine loading increase and the maximum was 65.5 mg/(L?d).No negative effects were found on COD removal although carbon oxidation activity of bioaugmented sludge was lower than that of common *** inoculation,adsorption to sludge flocs was favorable for GEM *** GEM population size initially decreased shortly and then was kept constant at about 104–105 CFU/*** of micro-organisms played an important role in the decay of the GEM *** leakage from MBR was less than 102 CFU/mL initially and was then *** contrast,in a conventionally activated sludge bioreactor(CAS),sludge bulking occurred possibly due to atrazine exposure,resulting in bioaugmentation failure and serious GEM *** MBR was superior to CAS in atrazine bioaugmentation treatment using GEM.

关键词： genetically-engineered microorganism(GEM) membrane bioreactor(MBR) atrazine

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A Novel Direct Power control Strategy for Three-Level PWM Rectifier Based on Fized Synthesizing Vectors

A Novel Direct Power Control Strategy for Three-Level PWM Re...

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11th International Conference on Electrical Machines and Systems(第11届国际电机与系统会议)

作者： Ting Lu Yongchang Zhang Yingchao Zhang Zhengming Zhao Liqiang Yuan State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department o State Key Laboratory of Control and Simulation of Power System and Generation EquipmentDepartment of

A novel direct power control (DPC) strategy for three-level neutral-point-clamped (NPC) pulse-width-modulation (PWM) rectifier, based on fixed synthesizing vectors, is proposed in this paper. The strategy breaks through the restrictions of vector switching with a simple switching table, improves the excellent dynamic performance of DPC, avoids the neutral-point voltage unbalance and the excessive voltage jumps in phase and line-to-line voltages of the rectifier, and guarantees the proper minimum pulse width and switching intervals between switches in different phases simultaneously. Experimental results verify the validity and feasibility of the proposed scheme.

关键词： Pulse width modulation Power control Rectifiers Space vector pulse width modulation Switches Thyristors Topology Voltage control Snubbers control system synthesis

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DC/DC Converter Applied in the Photovoltaic- Inclined Thermal Collector Hybrid Systems for Brackish Water Desalination

DC/DC Converter Applied in the Photovoltaic- Inclined Therma...

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11th International Conference on Electrical Machines and Systems(第11届国际电机与系统会议)

作者： Liqiang Yuan Mohamed Eltawil Zhengming Zhao Yaodong Lu State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department o State Key Laboratory of Control and Simulation of Power System and Generation EquipmentDepartment of

A chronic drinking water shortage is one of the most important issues in the developing countries, and drinking water from dirty water sources causes serious damage to inhabitants health in some remote areas. The solar distillation remains the most favorable process for the supplying of water to small communities. Base on the traditional solar still, an improved hybrid photovoltaic/thermal (PVT) desalination system is presented. The PV modules that are combined with thermal units, constitute the PVT systems which has longer operating time and higher average fresh water production. This paper introduces the DC/DC converter applied in this type of systems, including its structure and control strategy which is suitable for PV array and driving supportive heater. The experimental results for the converter and the whole system are showed and analyzed.

关键词： DC-DC power converters Photovoltaic systems Solar power generation Desalination Temperature Water resources Hybrid power systems Solar energy Water heating Power system simulation

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基于改进传递路径分析法的动力总成悬置系统优化及评价

基于改进传递路径分析法的动力总成悬置系统优化及评价

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2009中国汽车工程学会年会

作者： Long Yan 龙岩 Shi Wenku 史文库 Liang Tianye 梁天也 Zhou Zhou 周舟 Zhang Jun 张军 State Key Laboratory of Automobile Dynamical Simulation Jilin University China 吉林大学汽车动态模拟国家重点实验室 College of Biology Science Jilin University 吉林大学植物科学学院 The Automotive Engineering Research Institute of Chang’an Automobile Co. Ltd 长安汽车股份有限公司汽车工程研究院

提出一种基于改进的传递路径分析法的动力总成悬置系统的分析与参数优化方法，该方法利用实际工况测试数据建立整车传递特性模型，进行悬置传递特性分析与优化，并对整车车内振动进行预测，国产某轿车为例验证了该方法的正确性。最后还... 详细信息

提出一种基于改进的传递路径分析法的动力总成悬置系统的分析与参数优化方法，该方法利用实际工况测试数据建立整车传递特性模型，进行悬置传递特性分析与优化，并对整车车内振动进行预测，国产某轿车为例验证了该方法的正确性。最后还提出悬置系统性能的一种评价标准。

关键词：汽车结构动力悬置系统传递路径性能优化评价指标

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Modeling and experiment of stoke dependent shock absorber

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) 2008年第SUPPL.期38卷 32-36页

作者： Guo, Kong-Hui Sun, Sheng-Li Xing, Yun-Ming Gao, Shi-Meng State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun 130022 China Xichuan Auto Shock Absorber Factory Nanyang 474450 China

Based on the working principle, the internal configuration, and the valve system behavior of the shock absorber (SA), a mathematical model for the stroke dependent SA was built using the software ADAMS/Hydraulics. The damping force of the stroke dependent SA depends on not only the retative movement velocity, but also its displacement. In this model, the relationship between the SA dynamic behavior and its internal configuration was established by the parameters describing the valve system behavior. The calculated results agree well with the test data. The suggested model can be used to study the effects of construction parameters and dynamic behavior of the SA on the vehicle performance.

关键词： Shock absorbers

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Study in vehicle state estimation based on the information fusion algorithm

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) 2008年第SUPPL. 2期38卷 1-4页

作者： Zong, Chang-Fu Zheng, Hong-Yu Xu, Ying Liu, Lei State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun 130022 China College of Computer Science and Technology Jilin University Changchun 130012 China

According to a state estimation technology based on the information fusion algorithm, the longitudinal rate, yaw rate and side slip angle were estimated. The results of simulation and field test show that the proposed... 详细信息

关键词： state estimation

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