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Use of submerged anaerobic-anoxic-oxic membrane bioreactor to treat highly toxic coke wastewater with complete sludge retention

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Journal of Membrane Science 2009年第1-2期330卷 57-64页

作者： Zhao, Wen-Tao Huang, Xia Lee, Duu-Jong Wang, Xiao-Hui Shen, Yue-Xiao State Key Joint Laboratory of Environment Simulation and Pollution Control Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China Chemical Engineering Department National Taiwan University Taipei 106 Taiwan

Coke wastewater is an extremely toxic industrial effluent that requires treatment before discharge. A bench-scale, anaerobic-anoxic-oxic membrane bioreactor (A1/A2/O-MBR) system was utilized to treat real coke wastewater with complete sludge retention. In a 160-d test, the A1/A2/O-MBR system stably removed 87.9 ± 1.6% of chemical oxygen demand, 99.4 ± 0.3% of turbidity, and 99.7 ± 3.5% of NH4+-N from coke wastewater. The membrane rejected almost all suspended solids;hence, a low food-to-microorganism environment was created to degrade refractory substances and reduce sludge production rates. The microbial diversity in the MBR system declined over time;however, neither pollutant removal efficiency nor total biological activity was adversely affected. Membrane fouling, which occurred during the operation of the MBR system, was principally resulted from the colloidal fraction of supernatant in suspension. Physical cleaning removed initial deposits of particles;however, prolonged operation resulted in severe clogging that can only be removed by chemical cleaning. An A1/A2/O-MBR system with short intermittent physical cleaning was recommended for coke wastewater treatment. © 2009 Elsevier B.V. All rights reserved.

关键词： Bioreactors

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Multi-objective optimization of powertrain mounting based on MATLAB

Multi-objective optimization of powertrain mounting based on...

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2009 2nd Asia-Pacific Conference on Computational Intelligence and Industrial Applications, PACIIA 2009

作者： Shi, Wen-Ku Fu, Jiang-Hua Ya, Hao Teng, Teng State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun China FAW R and D Center China FAW Group Corporation I Changchun China

ISBN: (纸本)9781424446070

Taking the kinetic energy decoupling level as the objective function, stiffness of each mounting acted as the design variable, penalty function method and Powell algorithm were applied which were programmed in the MATLAB software. During the optimization the natural frequency and displacement of the powertrain mounting system were taken into account. To verify the result of optimization, the corresponding simulation model was built in ADAMS software. It could be concluded that the decoupling effect has been improved which is beneficial to ride comfort. ©2009 IEEE.

关键词： Powertrains

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Effects of chlorine disinfection on biotoxicity of reclaimed wastewater

Effects of chlorine disinfection on biotoxicity of reclaimed...

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Water Quality Technology Conference and Exposition 2009

作者： Hu, Hong-Ying Wu, Qian-Yuan Sun, Ying-Xue Wang, Li-Sha Tian, Jie Environmental Simulation and Pollution Control State Key Joint Laboratory Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

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Automotive Interior Noise Reduction in High Frequency Using Statistical Energy Analysis

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Defence Technology（防务技术） 2009年第3期5卷 161-167页

作者：陈鑫王登峰朱磊马正东 State Key Laboratory of Automobile Dynamic Simulation Jilin University College of Engineering University of Michigan

Statistical energy analysis (SEA) is an effective method for predicting high frequency vibro-acoustic performance of automobiles. A full vehicle SEA model is presented for interior noise reduction. It is composed of a number of subsystems based on a 3D model with all parameters for each subsystem. The excitation inputs are measured through road tests in different conditions,including inputs from the engine vibration and the sound pressure of the engine bay. The accuracy in high frequency of SEA model is validated,by comparing the analysis results with the testing pressure level data at driver's right ear. Noise contribution and sensitivity of key subsystems are analyzed. Finally,the effectiveness of noise reduction is verified. Based on the SEA model,an approach combining test and simulation is proposed for the noise vibration and harshness (NVH) design in vehicle development. It contains building the SEA model,testing for subsystem parameter identification,validating the simulation model,identifying subsystem power inputs,analyzing the design sensitivity. An example is given to demonstrate the interior noise reduction in high frequency.

关键词：统计能量分析汽车内饰高频振动降噪车辆模型噪声降低模型验证试验压力

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Numerical Study on Aerodynamic Characteristics of Isolated Wheel

Numerical Study on Aerodynamic Characteristics of Isolated W...

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第三届国际机械工程与力学会议

作者： Yingchao ZHANG Jie LI Zhe ZHANG State Key Laboratory of Automobile Dynamic Simulation Jilin University

As we know the influence of wheel to the whole car aerodynamic drag is great. Now with the development of automotive aerodynamics more and more focuses are put into the wheels to reduce aerodynamic drag of car. Some numerical simulations were carried out about the flow field around one isolated wheel of car based computational fluid dynamics in this project. There are some differences in the aerodynamic characteristics of wheel with wheel house or no. Some technologies which applied in these numerical simulations are introduced in this paper. The pressure distribution on the center line of tire surface is shown in this paper. The aerodynamic drag coefficients are obtained. Contrasting with all the pressure distribution of different wheel and different boundary setting in numerical simulation, some reasons why the drag coefficients differences existed are concluded. Some new research methods of numerical simulations and tests are presented.

关键词： Aerodynamics automobile drag, wheel computational fluid dynamics（CFD）

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Finite Element Modeling and Bending Strength Analysis on High Contact Ratio Gears

Finite Element Modeling and Bending Strength Analysis on Hig...

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第三届国际机械工程与力学会议

作者： Jie LI Lei ZHANG Qi ZHAO State Key Laboratory of Automobile Dynamic Simulation Jilin University

High contract ratio gears which would run quieter by constantly having two or more teeth sharing the load have become the tendency in design of modern transmission. According to the equation of transverse contact ratio, it is proposed that the design of high contact ratio gears should have a higher coefficient of addendum and a lower nominal pressure angle. Because the classical equivalent spur gear model is not adequate for the load distribution of high transverse contract ratio gear, the calculation method of contact lines of high contact ratio gears is represented based on the theory of engaging gears. The load of gears on the contact region is determined by modeling and meshing the finite element helical gear. The root stresses of the finite element model of helical gear are compared with the international standard of the calculation methods of load capacity for helical gears. The results showed the finite element model for gears bending stresses analysis not only has the higher calculation accuracy to the conventional contact ratio gears, but also be applied to some non-standard gears such as gears with high contact ratio. While the high contact ratio gear design is propitious to decrease gear bending stresses, and improves gear performance.

关键词： High Contact Ratio Finite Element Bending Stresses.

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Spectral response of rice(Oryza sativa L.) leaves to Fe^(2+) stress

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Science China(Life Sciences) 2009年第8期52卷 747-753页

作者： CHI GuangYu1,2,CHEN Xin1,SHI Yi1 & LIU XinHui3 1 key laboratory of Terrestrial Ecological Process,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China 2 Graduate School of Chinese Academy of Sciences,Beijing 100049,China 3 state key Joint laboratory of Environmental simulation and Pollution control,School of Environment,Beijing Normal University,Beijing 100875,China Key Laboratory of Terrestrial Ecological Process Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Graduate School of Chinese Academy of Sciences Beijing 100049 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China

In the management of lake eutrophication,the regulation effect of Fe is considered,in addition to the controlling nitrogen-and phosphorus *** on the "Fe hypothesis",this paper tentatively applied plant spectral response to the remote sensing early-warning mechanism of lake eutrophication.A laboratory water culture experiment with rice(Oryza sativa L.) was conducted to study Fe uptake by plants and the chlorophyll concentration and visible-near infrared spectrum of vegetable leaves as well as their interrelations under Fe2+ *** spectral indices,i.e.,A1(integral value of the changes of spectral reflectivity in the range 460―670 nm under Fe2+ stress),A2(integral value of the changes of spectral reflectivity in the range of 760―1000 nm under Fe2+ stress) and S(blue-shift range of red edge curve under Fe2+ stress),were used to establish quantitative models about the relationships between the rice leaf spectrum and Fe2+ *** the increase of Fe2+ in a culture solution,the Fe content in rice plants increased,while the chlorophyll concentration in vegetative leaves *** spectral reflectivity of vegetable leaves increased in the visible light band but decreased in the near infrared band,and the blue-shift range of the red edge curve *** indices A1,A2 and S all had significant correlations with the Fe content in rice leaves,the correlation coefficient being respectively 0.951(P < 0.01),?0.988(P < 0.01) and 0.851(P < 0.01),and simulated(multiple correlation coefficients R2 > 0.96) and predict the Fe level in rice leaves.

关键词： rice(Oryza sativa L.) spectrum Fe2+ lake eutrophication

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Clutch Slip control of Automatic Transmission Using Nonlinear Method

Clutch Slip Control of Automatic Transmission Using Nonlinea...

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

作者： Bingzhao Gao Hong Chen Yan Ma Kazushi Sanada the State Key Laboratory of Automobile Dynamic Simulation Jilin University Department of Mechanical Engineering Yokohama National University IEEE the Department of Control Science and Engineering Jilin University (Campus Nan Ling) the State Key Laboratory of Automobile Dynamic Simulation

To improve the shift quality of vehicle with clutchto-clutch gear shifts, a nonlinear controller is designed for the clutch slip control during the shift inertia phase of an Automatic Transmission(AT). Backstepping technique is used to deduce the control algorithm. Model uncertainties including steady state errors and unmodelled dynamics are also considered as additive disturbance inputs and the controller is designed such that the error dynamics is input-to-state stable(ISS). Lookup tables, which are widely used to represent complex nonlinear characteristics of engine systems, appear in their original form in the designed clutch slip controller. Finally, the designed controller is tested on an AMESim powertrain simulation model. Comparisons with an existing linear algorithm are given as well.

关键词： Clutch slip control automatic transmission backstepping input-to-state stability

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Modified Four-Node Isoparametric Element to Improve the Accuracy of One Step Forming

Modified Four-Node Isoparametric Element to Improve the Accu...

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International Conference on Information and Computing Science, ICIC

作者： Shanbin Lu Junyuan Zhang Hui Ye State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun China

The element warpage which was caused by condition that the four nodes of spacial quadrilateral element may not be coplanar affects stiffness matrix and nodal force vector of element. In order to improve the simulation accuracy, the modified four-node isoparametric membrane element was applied to one step forming. The computer program was also implemented. The simulation result of wheel cover strengthen panel was compared with the experimental one. It is found that the method can obtain favorable effectiveness.

关键词： Computational modeling Analytical models Algorithm design and analysis Biomembranes Deformable models Wheels Finite element methods Shape Laboratories automobiles

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Research on information fusion algorithm for vehicle speed information and road adhesion property estimation

Research on information fusion algorithm for vehicle speed i...

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IEEE International Conference on Mechatronics and Automation

作者： Dan Hu Changfu Zong Hsiaohsiang Na State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun China

To achieve the vehicle speed information and tire-road adhesion property is very important to the vehicle active safety control system. And how to utilize the sensors in vehicle to educe the needed information for these systems while ensuring the accuracy and real-time performance has great significance. In this paper, the state estimation theory of information fusion technology is applied to estimate the vehicle speed and tire-road friction coefficient based on a 3-degree-of-freedom vehicle model containing modified Dugoff tire model, which can not only satisfy the accuracy but also explain the relation of tire-road. Due to the nonlinear characteristic of tire-road behavior, the Extended Kalman Filter (EKF) is applied. By comparing with the outputs signals from CarSim, high accuracy as well as effective availability of this algorithm have been demonstrated.

关键词： Road vehicles Adhesives Vehicle safety state estimation control systems Sensor systems Real time systems Friction Tires Availability

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