检索结果-内蒙古大学图书馆

Identification of secondary organic aerosols based on aerosol mass spectrometry

Science China Chemistry 2010年第12期53卷 2593-2599页

作者： HUANG XiaoFeng 1,ZHAO QianBiao 1,2,HE LingYan 1,HU Min 2,BIAN QiJing 3,XUE Lian 1 & ZHANG YuanHang 2 1 key laboratory for Urban Habitat Environmental Science and Technology School of Environment and Energy,Peking University Shenzhen Graduate School,Shenzhen 518055,China 2 state key Joint laboratory of Environmental simulation and Pollution control College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China 3 Division of Environment,Hong Kong University of Science & Technology,Hong Kong,China 1. Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen 518055 China2. State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing 100871 China3. Division of Environment Hong Kong University of Science & Technology Hong Kong China

Secondary organic aerosol (SOA) is one of the major components of aerosols in the atmosphere and has not been well understood so *** to the complex chemical composition of organic aerosols,the identification of SOA has been a hotspot and difficult issue in the field of aerosol *** study attempts to quantitatively identify SOA in winter of Shenzhen based on positive matrix factorization (PMF) *** sources were resolved and SOA was identified subsequently according to the characteristic ion fragments measured by highly time-resolved aerosol mass spectrometer *** showed that in the winter of Shenzhen the average SOA concentration was 9.41±6.33 g/m 3,accounting for 39.9±21.8% of the total organic *** with primary organic aerosol (POA),the SOA concentrations had no large variation,suggestive of characteristics of regional secondary *** ratio of SOA/BC had pronounced diurnal variation,similar to that of O x (O3+NO2),indicating SOA formation was significantly controlled by activity of photochemistry in the *** most effective period for SOA formation was from 9 am～3 pm since the SOA/BC ratio increased by 122% during this *** study provides a new technical method and a new idea for SOA investigation.

关键词： secondary organic aerosol aerosol mass spectrometry positive matrix factorization (PMF)

来源：评论

学校读者我要写书评

暂无评论

Design and control of the Propulsion for a Series Hybrid Electric Vehicle

Design and control of the Propulsion for a Series Hybrid Ele...

引用

The 8th World Congress on Intelligent control and Automation(第八届智能控制与自动化世界大会 WCICA 2010)

作者： Junjie Li Xiumin Yu Huajie Ding Ping Sun The State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun Jilin Province China

As one of the future most popular vehicles, Hybrid Electric Vehicle has to satisfy the challenging and often conflicting requirements. Environment concerns have motivated the legislated action by government around the world to reduce nocuous emissions. The requirements for reduction of CO2 need a high fuel economy. The people's demands for low cost and efficient require a high reliability control system. Modern Hybrid Electric Vehicle advanced techniques can meet above requirements. In this paper, the authors described advanced methodologies for a Hybrid Electric Vehicle. The HEV system configuration is introduction firstly. The microcontroller named MPC566 was selected for the HCU and discussed in the second section. Advanced simulation techniques were developed for the Goble system based on Powertrain System Analysis Toolkit (PSAT). A simulation with developed models in the Matlab/Simulink has been taken to fully explore the potential of these advanced vehicles. Furthermore, a road test for the hybrid vehicle equipped with designed controller based on some drive cycles has been taken. Test results showed that the fuel cost is almost the same with that of simulation.

关键词： Hybrid electric vehicles Biological system modeling Engines Generators control systems Driver circuits

来源：评论

学校读者我要写书评

暂无评论

RETRACTED ARTICLE: Semi-rigid connection used to model the joint in the conceptual design of car bodies

RETRACTED ARTICLE: Semi-rigid connection used to model the j...

引用

作者： Xu, Tao Lin, Jieqiong Li, Yingchun Zuo, Wenjie Ju, Wei State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun China College of Mechanical Science and Engineering Jilin University Changchun China College of Mechanical and Electrical Engineering Changchun University of Technology Changchun 130022 China

ISBN: (纸本)9781424463503

The joint flexibility is an important issue in the conceptual design of car bodies. In the paper, semi-rigid connection is used to represent the compliant behavior of multi-branch flexible joints. The simplified joint model is established based on rigid beams and semi-rigid connection. And we adopt compliance method to solve the parameters of the model. Numerical example proved the accuracy of the model by taking Joint B as an example. © 2010 IEEE.

关键词： Conceptual design

来源：评论

学校读者我要写书评

暂无评论

MPC with one free control action for constrained LPV systems

MPC with one free control action for constrained LPV systems

引用

IEEE Conference on control Technology and Applications (CCTA)

作者： Shuyou Yu Christoph Böhm Hong Chen Frank Allgöwer Institute of Systems Theory and Automatic Control University of Stuttgart Germany State key laboratory of automobile dynamic simulation Department of Control Science and Engineering Jilin University China

Based on the assumption that the parameter can be measured in real time, we propose a model predictive control (MPC) method for linear-parameter varying (LPV) systems subject to possibly asymmetric constraints which adopts the analogous framework of terminal control law, terminal set and terminal penalty of nonlinear model predictive control. The optimization problem is formulated as a convex optimization problem and, recursive feasibility and closed-loop stability are guaranteed by its feasibility at initial time. For LPV systems with symmetric constraints, we reformulate the convex optimization problem as a semi-definite program. Numerical examples demonstrate the properties of the proposed MPC design.

关键词： Optimization Convex functions Stability analysis Predictive models Numerical stability Predictive control Robustness

来源：评论

学校读者我要写书评

暂无评论

Method of road traffic accidents causes analysis based on data mining

Method of road traffic accidents causes analysis based on da...

引用

International Conference on Computational Intelligence and Software Engineering

作者： Tian, Rui Yang, Zhaosheng Zhang, Maolei College of Traffic and Transportation State Key Lab. of Automobile Dynamic Simulation Jilin University Changchun Jilin 130022 China Department of Traffic Info. Engineering and Control Nanling Campus of Jilin University Changchun Jilin 130022 China

ISBN: (纸本)9781424453924

Aiming at the phenomenon of road traffic accident frequency, a method of road traffic accidents causes analysis based on data mining was put forward. First analyzed the related attributes and causes of road traffic accidents. Then introduced two kinds of basic theory of data mining : rough sets theory and the theory of association rules. Finally proposed the method of road traffic accidents causes analysis based on data mining. Using the method of traffic data analysis, can improve the road traffic safety management level effectively. ©2010 IEEE.

关键词： Data mining

来源：评论

学校读者我要写书评

暂无评论

Robust model predictive control with disturbance invariant sets

Robust model predictive control with disturbance invariant s...

引用

American control Conference

作者： Shuyou Yu Christoph Bohm Hong Chen Frank Allgower Institute of Systems Theory and Automatic Control University of Stuttgart Germany State key laboratory of automobile dynamic simulation and Department of Control Science and Engineering Jilin University PR China

ISBN: (纸本)9781424474264

This paper proposes a robust model predictive control scheme for nonlinear systems with state and input constraints and unknown but bounded disturbances. A standard nominal model predictive control problem with tightened constraints is solved online, and its solution defines the nominal trajectory. An ancillary control law is determined off-line which keeps the trajectories of the error system in a disturbance invariant set. Thus, the evolution of original nonlinear system lies in the disturbance invariant set centered along the nominal trajectory. Furthermore, it is shown that both feasibility and stability of the closed-loop system are guaranteed if the standard nominal optimization problem is initially feasible.

关键词： Robust control Predictive models Predictive control control systems Nonlinear systems Nonlinear control systems Stability Uncertainty Robustness Optimization methods

来源：评论

学校读者我要写书评

暂无评论

controller design for double motors wiper system based on differential flatness

Controller design for double motors wiper system based on di...

引用

Chinese control Conference (CCC)

作者： Haiyan Zhao Hong Chen Shu Li Fei Xie State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun 130025 China Department of Control Science and Engineering Jilin University Changchun 130025 China

Windscreen wiper is important components of automobile, and it must clear the dirt, rain and snow effectively. The state trajectory of the system and nominal trajectory of controlled quantity can be obtained based on differential flatness method, which is the two-degree feed-for-word control of controller. Feedback can be designed by PID controller with integral separation and it regulate the trajectory error of system, which caused by disturbance and uncertain factor. To solve the synchronous problem of double motors, the style of master-slave synchronization and clock control can be used in the system and the simulation result is given. From the simulation result, we can know that this proposed method in this paper avoid the collision because of the disturbance effectively, and the distance between the two windscreen wipers is greater than safety distance.

关键词： Automotive components Synchronization Synchronous motors Trajectory automobiles Artificial neural networks simulation

来源：评论

学校读者我要写书评

暂无评论

An FPGA/SOPC open system for designing and testing controllers

An FPGA/SOPC open system for designing and testing controlle...

引用

Chinese control Conference (CCC)

作者： Yi Xi Fang Xu Hong Chen Mingxing Liu State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun 130025 China Department of Control Science and Engineering Jilin University Changchun 130025 China

This paper presents an open system for designing and testing electronic control units of fast automotive control systems in order to build a prototype quickly and implement the real-time simulation verification. It integrates hardware, software and algorithms on a single FPGA. FPGA board can be used for hardware and a Nios II-based SOPC (System-on-a-Programmable- Chip) system is used to implement software and algorithms. Finally, we implement and test a PID algorithm and a model predictive control algorithm for controlling an electronic throttle by dSPACE or xPC-Target. The results verify the functionality of the developed system.

关键词： Field programmable gate arrays Pulse width modulation Prediction algorithms Software algorithms Predictive models Predictive control Real time systems

来源：评论

学校读者我要写书评

暂无评论

Output feedback control of electronic throttle based on observer

Output feedback control of electronic throttle based on obse...

引用

Chinese control Conference (CCC)

作者： Yunfeng Hu Hong Chen Hongyan Guo State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun 130025 China Department of Control Science and Engineering Jilin University Changchun 130025 China

The structure of the automotive electronic throttle control system is introduced in this paper. For the better tracking performance, a nonlinear electronic throttle model is setup for designing the controller. A observer is designed to estimate the unmeasured state variable. Backstepping technique is used to design the nonlinear output feedback controller. Finally, The simulation results are provided to demonstrate the effectiveness of the proposed controller.

关键词： Output feedback Backstepping Observers Tuning Automotive electronics Analytical models

来源：评论

学校读者我要写书评

暂无评论

Model- and MAP- based gasoline engine airpath control

Model- and MAP- based gasoline engine airpath control

引用

Chinese control Conference (CCC)

作者： Guifen Huang Hong Chen Yunfeng Hu State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun 130025 China Department of Control Science and Engineering Jilin University Changchun 130025 China

Based on the mechanism modeling method and the experimental data chart (MAP)commonly used in automobile engineering, the Mean Value Engine Model is established in this paper. On this basis, Aiming at management of the engine torque output, the airpath control system is designed, including the intake manifold pressure planning, throttle opening planning and throttle opening tracking. Finally, we verify the results in the environment of gasoline engine nominal value simulation model and high-fidelity four-cylinder PFI gasoline engine simulation model (enDYNA).

关键词： Engines Atmospheric modeling Petroleum Manifolds Torque Data models

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：