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Damping Structure Selection in Nonlinear Ship Manoeuvring Models

IFAC Proceedings Volumes 2010年第20期43卷 73-78页

作者： Tristan Perez Elías Revestido-Herrero School of Engineering Discipline of Mechanics and Mechatronics The University of Newcastle Callaghan NSW 2308 AUSTRALIA Centre for Ships and Ocean Structures (CeSOS) Norwegian University of Science and Technology (NTNU) Trondheim NORWAY Dept. of Electronic Technology Systems Engineering and Automatic Control University of Cantabria Spain

This paper presents the application of a statistical method for model structure selection of lift-drag and viscous damping components in ship manoeuvring models. The damping model is posed as a family of linear stochastic models, which is postulated based on previous work in the literature. Then a nested test of hypothesis problem is considered. The testing reduces to a recursive comparison of two competing models, for which optimal tests in the Neyman sense exist. The method yields a preferred model structure and its initial parameter estimates. Alternatively, the method can give a reduced set of likely models. Using simulated data we study how the selection method performs when there is both uncorrelated and correlated noise in the measurements. The first case is related to instrumentation noise, whereas the second case is related to spurious wave-induced motion often present during sea trials. We then consider the model structure selection of a modern high-speed trimaran ferry from full scale trial data.

关键词： System Identification Regression Analysis Ship Dynamics Hypothesis Testing

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Energy-optimized secure remote fingerprint authentication in a mobile environment

Energy-optimized secure remote fingerprint authentication in...

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IEEE International Conference on Consumer electronics (ICCE)

作者： Seungwoo Hong Sungju Lee Yongwha Chung Hakil Kim Sungbum Pan Human ID Research Team Electronics and Telecommunications Research Institute South Korea Human ID Research Team Dept. of Computer and Information Science Korea University South Korea Dept. of Computer and Information Science Korea University Dent. of Information and Communication Engineering Biometrics Engineering Research Center Inha University South Korea Dept. Control Instrumentation and Robot Engineering Chosun University South of Korea

ISBN: (纸本)9781424443147

To optimize the energy consumption during transmission in a secure remote fingerprint authentication system, most approaches have considered a fixed-rate compression of WSQ(Wavelet Scalar Quantization). To balance the energy consumption and the recognition accuracy, however, we need to consider the total energy consumption during compression/encryption/transmission and the quality of the given image. In this paper, we first develop an energy-accuracy prediction model. Then, from the given image, we can evaluate the quality of it. Finally, from the user's minimum requirement of the recognition accuracy, the energy-optimized compression rate under the requirement can be derived adaptively. Based on the experimental result, we show that total energy consumption of the fixed approach can be reduced by 29%.

关键词： Fingerprint recognition Authentication Image coding Image matching Energy consumption Handheld computers Cryptography Power engineering and energy Image recognition Biometrics

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Fundamental modeling of vehicle power network system using VHDL-AMS

Fundamental modeling of vehicle power network system using V...

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2010 International Symposium on Power electronics, Electrical Drives, Automation and Motion, SPEEDAM 2010

作者： Ueno, Shingo Tsuji, Kimitoshi Abe, Takashi Higuchi, Tsuyoshi Shigematsu, Koichi Dept. of Electrical and Electronic Engineering Nagasaki University 1-14 Bunkyo-machi Nagasaki 852-8521 Japan Advanced Vehicle Control System Eng. Dev. Toyota Motor Corp. 1200 Mishuku Susono Shizuoka 410-1193 Japan Cybernet Systems Co. Ltd. Fujisoft Bldg. 6-26 Nishiki 1-Chome Naka-ku Nagoya 460-0003 Japan

ISBN: (纸本)9781424449873

The vehicle system is a multi-domain system that requires many branches of science and engineering. Therefore the development of the vehicle system requires the use of design methodologies that utilize simulations, which have grown increasingly sophisticated in recent years. This paper describes how VHDL-AMS was used to model the powertrain, alternator and battery system that are the basic elements of the vehicle power network system, and examines the simulation results with the aim of realizing a system simulation whose scope covers the entire vehicle. © 2010 IEEE.

关键词： Electric power transmission networks

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Electro-thermal simulation and characterization of preconcentration membranes

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Procedia engineering 2010年 5卷 1264-1267页

作者： R. Inglés J. Pallares I. Gràcia A.M Gué J.L. Ramirez Dept. of Electronic Electrical and Automatic Control Engineering ETSE Universitat Rovira i Virgili Tarragona Spain Department of Mechanical Engineering ETSEQ Universitat Rovira i Virgili Tarragona Spain Centro Nacional de Microelectrónica CNM-CSIC Bellaterra Spain Laboratoire d’analyse et arquitecture des systèmes (LAAS) CNRS Toulouse France

Preconcentrators have been much studied last years to enhance sensitivity of gas sensors. We use electro-thermal simulations to design thermal isolated membranes that supports thin film heaters as components of gas preconcentrators, these heaters provide a good thermal homogeneity ensuring a narrow desorption peak and improving in this way the sensors response. We have validated our simulations with experimental results.

关键词： Preconcentrator Heater design Electrothermal simulation

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A Carrier Recovery Algorithm for High Order QAM Signals

A Carrier Recovery Algorithm for High Order QAM Signals

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International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Wei Xue Xiaoniu Yang Zhaoyang Zhang Department of Information Science and Electronic Engineering Zhejiang Uinversity Hangzhou Zhejiang China National Laboratory of Information Control Technology for Communication System Jiaxing Zhejiang China Dept. of Inf. Sci. & Electron. Eng. Zhejiang Uinversity Hangzhou China

The carrier recovery is one key technique in the demodulation of high order quadrature amplitude modulation (QAM) signals. A carrier recovery algorithm which switches between multi-threshold polarity decision mode and decision directed mode according to the standard deviation of the frequency of numerically controlled oscillator (NCO) is proposed. The proposed algorithm can detect a proper time for the mode switch to yield lower steady state error. The simulation results demonstrate the effectiveness of the proposed algorithm in improving the performance of blind carrier recovery.

关键词： Phase locked loops Quadrature amplitude modulation Steady-state Detectors Signal processing algorithms Constellation diagram Simulation

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Electro-thermal simulations to improve heater design in preconcentration membranes

Electro-thermal simulations to improve heater design in prec...

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International Workshop on Thermal Investigation of ICs and Systems (THERMINIC)

作者： R. Inglés J. Pallares I. Gràcia A. M Gué J. L. Ramirez Dept. of Electronic Electrical and Automatic Control Engineering Universitat Rovira i Virgili Tarragona Spain Department of Mechanical Engineering Universitat Rovira i Virgili Tarragona Spain Centro Nacional de Microelectronica CNM-CSIC Bellaterra Spain Centro Nacional de Microelectronica CNM-CSIC Bellaterra Bellaterra Spain Laboratoirc d'analyse et arquitecture des systemes (LAAS) CNRS Toulouse France

We have developed electro-thermal 3D transient simulations in order to design an optimized heater for preconcentration membranes. An evaluation of parameters of simulation and boundary conditions have been done. We ha... 详细信息

关键词： Biomembranes Resistance heating Resistance Temperature measurement Atmospheric modeling

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Image de-weathering for road based on physical model

Image de-weathering for road based on physical model

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2009 International Conference on Information engineering and Computer Science, ICIECS 2009

作者： Zhu, Yuhui Fang, Bin Zhang, Huiqing Dept. of Electronic Information and Control Engineering Beijing University of Technology Beijing China

ISBN: (纸本)9781424449941

Images of roads captured in bad weather suffer from poor contrasts and colors. It is known that the degradation of an image due to scattering of light is exponential in the dept.s of the scene points. Therefore, to estimate the dept.s, previous algorithms using physical model develop an interactive step. But the method is limited, because it needs to estimate four or more unknown parameters and select the vanishing point manually. In this paper, we present a simple implementation based on Hough transform and maximum entropy theory to solve the problems. First, the physical model is simplified to reduce the number of unknown parameters to one. Then, an automatic method based on Hough transform is proposed to select the vanishing point. Finally, the maximum entropy theory is used to acquire the optimal parameter. The experimental results on real images show the effectiveness of the approach. ©2009 IEEE.

关键词： Image reconstruction

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Research and applications of immune PID adaptive controller in anti-skid braking system for aircraft

Research and applications of immune PID adaptive controller ...

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2009 International Conference on Information engineering and Computer Science, ICIECS 2009

作者： Song, Haibin Fang, Bin Wang, Pu Dept. of Electronic Information and Control Engineering Beijing University of Technology Beijing China

ISBN: (纸本)9781424449941

For modern aircraft, the anti-skid braking system is one of the key airborne equipment and plays a very important role in safe takeoff and landing. Aircraft anti-skid braking system must prevent tires from slipping extremely on the track, and ensure aircraft landing safety and stability with maximum braking efficiency. Since aircraft anti-skid braking system is a time-varying nonlinear system, traditional PID control algorithm is difficult to get predictive results and many intelligent methods have been applied to the system. In this paper, a new control algorithm with immune PID for aircraft anti-skid braking system combined with the advantages of PBM (pressure-bias-modulated) is presented. The results of simulation indicated that this method greatly improves braking efficiency, shortens braking distance, and boosts up aircraft braking performance and robustness. ©2009 IEEE.

关键词： Braking

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The surveillance system based on RFID system for privacy protection

The surveillance system based on RFID system for privacy pro...

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2009 2nd International Conference on Computer Science and Its Applications, CSA 2009

作者： Moon, Hae-Min Chae, Seung-Hoon Pan, Sung Bum Dept. of Information and Communications Engineering Chosun Univ. Gwangju Korea Republic of Dept. of Control Instrumentation and Robot Engineering Chosun Univ. Gwangju Korea Republic of

ISBN: (纸本)9781424449460

Due to increased terrors and crimes, the use of the surveillance system like CCTV is increasing. The surveillance system has been operated for public interest such as prevention of crimes and fly-tipping by the police and local government. However private information such as faces or behavior patterns can be recorded in CCTV, it may cause the invasion of privacy. This paper analyses conventional methods of privacy protection in surveillance camera systems. We propose a video surveillance system that satisfies both privacy protection and surveillance. The proposed system uses the RFID to recognize the human and uses the scrambling to prevent invasion of privacy. Note that the proposed system can reduce invasion of privacy by intensity of scrambling according to access levels. It is able to exactly offer internal or external personnel information of objects to the surveillance. Based on the experimental results, we confirm that the proposed system can be privacy protection and the surveillance. © 2009 IEEE.

关键词： Crime

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Telemetry microcomputer application in satellites OBC

Telemetry microcomputer application in satellites OBC

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1st South Central Asian Himalayas Regional IEEE/IFIP International Conference on Internet, AH-ICI 2009

作者： Ahmed, Hossam Eldin Hussein Kamal, Elkhatib Elsayed, Ahmed Communication Engineering Dept. Faculty of Electronic Engineering Menoufia University Menouf Egypt Industrial Electronics and Control Dept. Faculty of Electronic Engineering Menoufia University Menouf Egypt Communication Engineering Dept. Benha High Institute of Technology Benha University Qaliuobia Egypt

ISBN: (纸本)9781424445707

An on-board computer (OBC) is the brain of any satellite. In this paper we discuss the design of an on-board computer system for micro satellite;the design technologies for large commercial satellites cannot be directly used for the micro satellite due to the compactness of OBC. This equipment monitors and auto control pressure, temperature, direction, all the telemetry equipments, the communication channel transmission and receiving between satellite and terrestrial stations. It is generally a very expensive device, with cost amounting to hundreds of thousands of dollars. Our design for general purpose and adaptable OBC, for use in general as low-earth-orbit (LEO) microsatellites. Our system is economical system and compatible with a small size satellite the hardware and software design of this OBC is based upon open and flexible design architecture. The idea is that the design can be used in or adapted for a variety of small LEO micro-satellites with minimal modifications. Keeping these goals in view, a complete architecture of the OBC has been discussed and developed. The design is based on the Intel X86 microprocessor technology. Instructions set, addressing modes, interrupts, in and out and digital and analog interfaces. In addition, the features of on-board computer hardware and operating system are presented. Also the memory subsystem error log is discussed. ©2009 IEEE.

关键词： Satellites

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