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IEEE International Conference on Robotics, Intelligent Systems and Signal Processing

作者： X. Li R. Du B. Denkena J. Imiela Dept. of Automation & Computer-Aided Engineering The Chinese University of Hong Kong Shatin N. T. Hong Kong Chin. Institute Production Engineering and Machine Tools University Hanover Hanover Germany

ISBN: (纸本)078037925X

In recent years, a number of machine tools have been built using linear motors. These machine tools have great potential for precision and high speed machining. Nevertheless, a number of problems remain unsolved, such as monitoring and control. This paper presents a new tool breakage monitoring method for this type of machine tool by using the current of the linear motor. From a mathematical point of view, the new method uses a nonlinear energy operator to capture the abrupt changes of the motor current signal, which is directly related to the tool breakage. Experimental validation is included.

关键词： Condition monitoring Milling Machine tools Force sensors Force measurement Machining Costs Robots Signal processing Production engineering

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Manhole detection and location for urban pavement

Manhole detection and location for urban pavement

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International Conference on Intelligent Transportation

作者： Tang Nan Mu Xianyang Li Lin Ce Liu Jiang Xiuhan Industrial Automation Department Xi'an Shiyou University Xi'an Shaanxi P.R. CHINA Dept. of Ind. Autom. Xi'an Shiyou Univ. China Industrial Automation Department Xi'an Shiyou University Xi'an Shaanxi P.R CHINA Department of Electrical and Computer Engineering University of Houston Houston TX U. S. A.

ISBN: (纸本)0780381254

An underground practical sensing system was developed to detect covered-over manholes along the sewer lines under the urban pavement. The sensor head of the system is composed of a sonde and some transmitting and receiving circuits. Coil-type antennas has been designed and implemented base on the induction principle and numerical simulation. The transmitting circuits generate excitation current for the transmitting antennas, and the signal received by the receiving antennas is processed with the receiving circuits. A windows-based application software can calculate phase shift as well as amplitude value of the receiving signal. And there is also a distance-measurement device to provide information about the location of the covered-over or missing manholes. Satisfactory results have been achieved from the field tests of the system in actual manholes. For loop antennas with a spacing of 0.5 m, the system has a phase resolution of about 1/spl deg/ and an amplitude resolution of about 0.5%.

关键词： Receiving antennas Transmitting antennas Sensor systems Numerical simulation Induction generators Signal generators Signal processing Application software Circuit testing System testing

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Towards an integration of different specification methods by using the viewpoint framework

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Journal of Integrated Design and Process Science 2002年第2期6卷 1-23页

作者： Enders, Bettina E. Heverhagen, Torsten Goedicke, Michael Tröpfner, Peter Tracht, Rudolf Specification of Software Systems Dept. of Mathematics and Computer Science Germany Automation Technology Dept. of Mechanical Engineering University of Essen Germany

In industrial interdisciplinary projects where engineers of different sorts have to work together, a framework is necessary in order to support such an interdisciplinary development process. For example, the design information created by the production automation engineer has to be set into relation to the software architecture the software designer has to produce which will control the automation plant. Such requirements result in the need to consistently integrate various specification methods and development processes performed during the various development stages. This contribution shows that such an integration of heterogeneous specification methods concerning the various heterogeneous components of production automation systems can be achieved using the ViewPoint framework. This framework provides an intuitive understanding of different specifications involved in the development process, on the one side. On the other side the ViewPoint framework allows for a consistent and correct integration of these specifications due to its existing formalization by distributed graph transformation. © 2001 Society for Design and Process Science.

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3-D shape recovery across two views based on approximate geometric constraints 6

3-D shape recovery across two views based on approximate geo...

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6th International Conference on Signal Processing, ICSP 2002

作者： Wong, Hau-San Chung, Ronald Dept. of Computer Science City University of Hong Kong Kowloon Tong Hong Kong Dept. of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin Hong Kong

ISBN: (纸本)0780374886

In this paper, we propose a new approach to object matching and shape reconstruction across two views. The approach relies on the topological relationship among the feature points and a crude rigidity constraint (epipolar condition) in carrying the object from the mnodel view to the scene view to a first good approximation. The correspondences are then refined by fitting an active contour model to the transferred feature points on the scene view, which automatically assumes the shape of the object on correct matching. Under the assumption of weak perspective projection, it could be shown that the establishment of such correct correspondences would result in the full determination of the relative dept.s of all the matched object points in 3-D space and thus recovery of the complete 3-D structure of the object. © 2002 IEEE.

关键词： Shape optimization

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Towards an impact analysis for component based real-time product line architectures

Towards an impact analysis for component based real-time pro...

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Joint Meeting of the 28th EUROMICRO Conference/EUROMICRO Symposium on Digital System Design

作者： Wall, A Larsson, M Norström, C Mälardalen University Mälardalen Real-Time Research Centre Dept. of Computer Engineering Sweden ABB Automation Technology Products Sweden

ISBN: (纸本)0769517870

In this paper we propose a method for predicting the consequences of adding new components to an existing product line in the real-time systems domain. We refer to such a prediction as an impact analysis. New components are added as new features are introduced in the product line. Adding components to a real-time system may affect the temporal correctness of the system. In our approach to product line architectures, products are constructed by assembling components. By having a prediction enabled component technology as the underlying component technology we can predict the behavior of an assembly of components. We demonstrate our approach by an example in which temporal correctness and consistency between versions of components is predicted.

关键词： Real time systems

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Implementation of a Fuzzy-PI controller for a pulsed plasma nitriding power source

Implementation of a Fuzzy-PI controller for a pulsed plasma ...

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37th IAS Annual Meeting and World Conference on Industrial applications of Electrical Energy

作者： Salazar, Andrés Ortiz Maitelli, André Laurindo De Azevedo, Fabiano Medeiros Electrical Engineering Dept. Rio Grande do Norte Fed. University Natal Brazil Computer and Automation Eng. Dept. Rio Grande do Norte Fed. University Natal Brazil Electrical Engineering Dept. Rio Grande do Norte Fed. University Natal Brazil

ISBN: (纸本)0780374207

The pulsed plasma nitriding process is widely used nowadays in the treatment and hardening of metallic components. But the voltage regulation on the nitriding chamber, although necessary, is hard to be done, because it depends on the components' dimensions, on pulse's width and on the unstable nature of plasma. Taking this in account, this work proposes the use of a Fuzzy-PI controller on the nitriding power source to provide a versatile control, allowing a good voltage regulation under different operational points, i.e., for distinct chamber's conditions.

关键词： Electric power systems

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On-line improvement for the decentralized predictive control of the heat dynamics of a greenhouse 15th

On-line improvement for the decentralized predictive control...

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15th World Congress of the International Federation of Automatic Control, 2002

作者： Kyriannakis, E.J. Arvanitis, K.G. Sigrimis, N. National Technical University of Athens Dept. of Electrical and Computer Engineering Intelligent Robotics and Automation Laboratory Zographou Athens15773 Greece Agricultural University of Athens Department of Agricultural Engineering Athens11855 Greece

ISBN: (纸本)9783902661746

A decentralized model-based predictive controller is used for the design of discrete-time control systems aiming at regulating the air temperature and heat supply in greenhouses. Moreover, alternative techniques are proposed for the approximation of the decentralized part of the control and the on-line improvement of the overall control problem. A state space model is used to predict the corresponding local indoor temperature over a long-range time-period and approximate models are used to predict the interactions among the subsystems. The sun radiation and outdoor temperature are treated as external disturbances that affect the overall system dynamics. A series of energy fluxes consist the heating system and the predictive controllers have proved to be powerful in controlling the supply temperature. Copyright © 2002 IFAC.

关键词： Discrete time control systems

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A BONE REAMING SYSTEM WITH TACTILE TEMPERATURE DISPLAY

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IFAC Proceedings Volumes 2002年第1期35卷 85-90页

作者： Raymond H.W. Lam Imad Elhajj Wen J. Li Ning Xi Dept. of Automation and Computer-Aided Eng The Chinese University of Hong Kong Hong Kong Dept. of Electrical and Computer Eng. Michigan State University USA Contact Author: The Chinese University of Hong Kong Department of Automation and Computer-Aided Engineering MMW 422 Shatin NT Hong Kong

A bone reaming system with temperature tactile sensation display was developed for potential use during bone internal fixation surgery. The developed reaming system will allow tracking of the amount of heat generated inside fractured bones by surgeons throughout the reaming process. It consists of a temperature sensing system to measure the bone cavity temperature, a rotor system to provide the rotational motion to the system, which emulates the rotational motion during a surgical bone-drilling procedure, and a RF receiver for receiving the wireless signal representing the measured temperature. The performance of the temperature sensing system was analyzed, including temperature signal linearity and wireless temperature signal transmission. Experiments were also conducted to play the temperature data from the sensing system over the Internet and allow a remote operator to feel the temperature sensation by using a thermoelectric heating/cooling device. Implementation of the new reaming system will allow surgeons to perform feedback control of temperature generation inside bone cavities, and hence, reduce the potential risks of bone internal fixation surgery significantly.

关键词： bone reaming system internal fixation tactile temperature sensation thermoelectric device medical systems temperature control

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An UDP-based protocol for Internet robots

An UDP-based protocol for Internet robots

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Proceedings of the 4th World Congress on Intelligent Control and automation

作者： Liu, Peter Xiaoping Meng, Max Ye, Xiufen Gu, Jason Dept. of Elec. and Computer. Eng. University of Alberta Edmonton Alta. T6G 2V4 Canada Automation College Harbin Engineering University Harbin Heilongjiang 150001 China Dept. of Elec. and Computer Eng. Dalhousie University Halifax NS B3J 2X4 Canada

For real-time applications such as Internet robots, The UDP protocol is shown more suitable than the TCP in terms of delay and delay jitter. But uncontrolled UDP traffic may do harms to the majority TCP flows or even threaten the Internet stability. Upon a study of the data transmission characteristics of the Internet robotic applications, a novel Internet robot oriented data transmission algorithm based on the UDP protocol is introduced. The great advantage of this scheme is that extra bandwidth can be probed and caught up with adaptively within a reasonable short period of time while smoothness of sending rate is achieved. The TCP-friendliness, intra-protocol fairness and efficiency boundness of the protocol are shown in the paper.

关键词： Network protocols

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Internet-enhanced automation in micro environment

Internet-enhanced automation in micro environment

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Proceedings of the 4th World Congress on Intelligent Control and automation

作者： Li, Wen J. Xi, Ning Wang, Yuechao Ma, Shugen Dept. Automat./Computer-Aided Eng. The Chinese University of Hong Kong Shatin New Territories Hong Kong Dept. of Electrical and Comp. Eng. Michigan State University East Lansing MI 48824-0590 United States Shenyang Institute of Automation Chinese Academy of Sciences 114 Nanta Street Shenyang China Dept. of Systems Engineering Ibaraki University Ibaraki Japan

Recent developments in the Internet have significantly increased the human capability to reach and obtain information from remote locations. In parallel, the advent of micro sensors and actuators makes it possible for humans to sense and act in a microenvironment. Combined, the Internet and MEMS will produce a new technology for humans to sense and act in remote microenvironments, allowing the potential development of micro teleoperation and micro automation technologies. These new technologies have potential impact on several fields, including remote micro-automation and biomedical engineering. In this paper, we will present our ongoing development of polyvinylidence fluoride (PVDF) sensors that can be used force-reflective control of micro-mechanical devices over the Internet. Internet based teleoperation between Hong Kong and Michigan State was demonstrated using an event-based control scheme, which ensured stability and synchronization. Control was enhanced by multimedia feedback, which included, in addition to the traditional video, force feedback. The force fed back augmented the limited information supplied by visual feedback. We believe this project will eventually make a great impact to the globalization of MEMS foundries because it will allow global users of micro-assemble and micro-manipulate surface micromachined devices from their laboratories, and hence, reduce the time from design to production significantly.

关键词： Microelectromechanical devices

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