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International Symposium on Signals, Circuits and Systems (ISSCS)

作者： Tianliang Yang Chunyu Zhao Jinying Zhang Dayue Chen Institute of Intelligent Mechatronics and Control School of Electronics Information and Electrical Engineering Shanghai Jiaotong University Shanghai China

This paper presents an analysis of the effect of duty ratio on power loss and efficiency of the transcutaneous energy transmission system (TETS) with a class-E power amplifier. Conduction loss for each component of the TETS circuit is derived and the total efficiency of the TETS is expressed as functions of the duty ratio D . Three identical TETS at D = 0.25 , 0.5 and 0.75 are designed, constructed and tested. The experimental results match closely with the calculated ones at the power loss and total efficiency.

关键词： Propagation losses Power amplifiers RLC circuits Paramagnetic resonance Rectifiers Coils Immune system Power system modeling Magnetic resonance Prosthetics

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Simulation of stage I short crack propagation in an austenitic-ferritic duplex steel

Simulation of stage I short crack propagation in an austenit...

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12th International Conference on Fracture 2009, ICF-12

作者： Köster, P. Knobbe, H. Fritzen, C.-P. Christ, H.-J. Krupp, U. Institute of Mechanics and Control - Mechatronics University of Siegen 57068 Siegen Germany Institute of Materials Science University of Siegen 57068 Siegen Germany Faculty of Engineering and Computer Sciences University of Applied Sciences Osnabrück 49009 Osnabrück Germany

ISBN: (纸本)9781617382277

The propagation of short fatigue cracks is simulated in the microstructure of an austenitic-ferritic duplex steel by means of a mechanism-based model. Due to strong interactions with microstructural features, such as grain and phase boundaries the growth rate of these short cracks is substantially non-uniform. The strength of these barriers has been quantified by a Hall-Petch analysis and the findings have been implemented into a two-dimensional model for stage I crack propagation, which considers the orientation of available slip systems and can predict the crack growth in a real microstructure. The model allows the activation of secondary slip systems at the crack tip resulting in a crack propagation on multiple slip bands. To study the effect of a misorientation between two slip planes on crack propagation the stress field at the tip of a surface crack is calculated using a three dimensional extended crack model. Crack growth simulations carried out with the model show good agreement with experimental data.

关键词： Crack propagation

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Stereo Correspondence Problem of Single-lens bi-Prism Stereovison System

Stereo Correspondence Problem of Single-lens bi-Prism Stereo...

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第二届国际数字制造论坛

作者： Kah Bin Lim Minh Trung Nguyen Control and Mechatronics Laboratory EA-04-06Mechanical Engineering Department National University of SingaporeSingapore 117576

A geometry-based method is proposed in this paper to solve the stereo-correspondence problem of single-lens biprism stereovision *** an optical bi-prism and a static CCD camera setup,image pairs are captured synchronously by two virtual cameras which are defined by two boundary lines:optical axis and CCD camera field of view(FOV) boundary *** geometrical relationship between the 2D images and the 3D scene are established by applying two fundamental theories:geometrical analysis in which all the pertinent points,lines and planes are expressed in 3D Camera Coordinates and the Rules of Refraction. Subsequently,the least square method is employed to fit the epipolar line with a set of obtained corresponding point candidates. The corresponding points are located by searching along the epipolar fine with SSD(Sum of Square Difference) correlation algorithm. By utilizing the uniquely geometrical properties of the bi-prism stereovision system,complicated camera calibration procedures are exempted to settle down the stereo *** geometry-based method can be easily generalized to tri-ocular and multi-ocular stereovision systems to facilitate the solving of stereo-correspondence *** are conducted to validate this method.

关键词： Geometry-based method single lens bi-prism the rules of refraction stereo correspondence epipolar geometry SSD

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Mechatronic design of a fast and long range 4 degrees of freedom humanoid neck

Mechatronic design of a fast and long range 4 degrees of fre...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： D.M. Brouwer J. Bennik J. Leideman H.M.J.R. Soemers S. Stramigioli Mechanical Automation and Mechatronics group DEMCON advanced mechatronics University of Twente Netherlands Philips Consumer Lifestyle Netherlands DEMCON advanced mechatronics Oldenzaal Netherlands Mechanical Automation and Mechatronics group Philips Applied Technologies DEMCON advanced mechatronics University of Twente Netherlands Control Engineering group University of Twente Netherlands

This paper describes the mechatronic design of a humanoid neck. To research human machine interaction, the head and neck combination should be able to approach the human behavior as much as possible. We present a novel humanoid neck concept that is both fast, and has a long range of motion in 4 degrees of freedom (DOFs). This enables the head to track fast objects, and the neck design is suitable for mimicking expressions. The humanoid neck features a differential drive design for the lower 2 DOFs resulting in a low moving mass and the ability to use strong actuators. The performance of the neck has been optimized by minimizing backlash in the mechanisms, and by using gravity compensation. Two cameras in the head are used for scanning and interaction with the environment.

关键词： mechatronics Neck Magnetic heads Humans Cameras Spine Acceleration Robotics and automation Actuators Gravity

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SLIDING MODE control APPLIED TO OFFSHORE DYNAMIC POSITIONING SYSTEMS

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IFAC Proceedings Volumes 2009年第18期42卷 237-242页

作者： Adriana C. Agostinho Lázaro Moratelli Eduardo A. Tannuri Hélio Mitio Morishita Dept. of Telecommunication and Control Engineering University of SÃo Paulo Dept. of Naval Architecture and Ocean Engineering University of SÃo Paulo Dept. of Mechatronics Engineering University of SÃo Paulo

The technique of Dynamic Positioning (DP) consists on keeping the position and heading of a vessel by the use of active thrusters. In Brazil, the offshore oil industry follows the recent tendency of performing several operations aided by DP systems, such as prospection, drilling, offloading and others. Currently, the DPS are based on conventional controllers (PD + Kalman Filter). This paper proposes the application of a controller based on nonlinear sliding mode control technique to the dynamic positioning of a floating vessel, as well as some simulations and experimental validation results.

关键词： sliding mode control vessel control nonlinear systems dynamic positioning systems

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Effect of heating temperature on microstructure and mechanical properties of continuous copper fiber

Effect of heating temperature on microstructure and mechanic...

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International Conference on Industrial mechatronics and Automation, ICIMA

作者： Xiaoling Wei Minqiang Pan Zeng Dehuai Qinghui Wang Yong Tang Wei Zhou School of Mechanical and Automotive Engineering South China University of Technology Guangzhou China School of Mechatronics and Control Engineering Shenzhen University Shenzhen China

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Concept for an active cabin suspension

Concept for an active cabin suspension

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International Conference on mechatronics (ICM)

作者： Christian Graf Jurgen Maas Hans-Christian Pflug Control Engineering and Mechatronics Ostwestfalen-Lippe University of Applied Sciences Lemgo Germany Daimler Benz Aerospace Stuttgart Germany

By using an active cabin suspension with four bearings for commercial vehicles the degrees of freedom for lifting, rolling and pitching can be isolated actively from the disturbing vibrations. In this paper a model-based design of the vibration controller is described. The achieved reduction of vibrations is proofed by measurements obtained by road tests.

关键词： Vibration measurement Damping Vibration control Vehicles Springs Shock absorbers Roads mechatronics Automotive engineering Biological system modeling

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New Method of Saving Energy for Automobiles

New Method of Saving Energy for Automobiles

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IEEE PES Asia-Pacific Power and Energy engineering Conference (APPEEC)

作者： Yufeng Guo Shuangchen Ruan College of Mechatronics and Control Engineering Shenzhen University Shenzhen China College of Electronics Science and Technology Shenzhen University Shenzhen China

When the coaches and trucks are moving, the heads of the automobiles endure the strong press of the wind. If the wind can be used to generate the electricity, it will save a lot of energy. Based on the idea, an experiment was designed in this paper. A model automobile was modified to produce and store the electricity. The experiment results show that the method is feasible to save energy for automobiles.

关键词： Automobiles Circuits DC motors Power generation Turbines Power system modeling Wind energy generation Wind energy Voltage Educational institutions

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Development of GUI Panel for Microprocessor-Based controller of a Mini-Aerial Helicopter Application

Development of GUI Panel for Microprocessor-Based Controller...

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International Conference on Emerging Trends in engineering and Technology, ICETET

作者： H. A. Kasdirin M. Herman Jamaluddin A. Zaki H. Shukor Alias Khamis Control Department Faculty of Electrical Engineering UTeM Malaysia Mechatronics Department Faculty of Electrical Engineering UTeM Malaysia Industrial Power Department Faculty of Electrical Engineering UTeM Malaysia

This paper describes a design and development of a graphical user interface (GUI) panel for microprocessor-based controller for a flying robot applications. The robot consists of a mini-aerial helicopter with a build-in integrated camera that linked to a PC-based controller that manipulated by a GUI Panel program. A couple of full duplex transceivers are used to provide wireless communications between the controller and the flying robots. The main objective is building advanced GUI panel that could simulate and visualize high-performance robot systems for further image acquisition and analysis. The test result is well described and the vision data captured is encouraging for future development. Some problems is also being notified for further improvement of the flying robot system.

关键词： Graphical user interfaces Helicopters Communication system control Robot vision systems Cameras Transceivers Wireless communication Analytical models Data visualization Image analysis

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On fast computation of Effective Independence through QR downdating for sensor placement

On fast computation of Effective Independence through QR dow...

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27th Conference and Exposition on Structural Dynamics 2009, IMAC XXVII

作者： Li, Dong-Sheng Li, Hong-Nan Fritzen, Claus-Peter State Key Laboratory of Coastal and Offshore Engineering Dalian Univ. of Technology Linggong RD.2 Dalian 116023 China Institute of Mechanics and Automatic Control - Mechatronics University of Siegen Paul-Bonatz Str. 9-11 D-57076 Siegen Germany

ISBN: (纸本)9781605609614

A simple and fast computational algorithm of the Effective Independence for sensor placement is presented in the paper. It is based on the relationship between the Effective Independence and Modal Kinetic Energy method, and on a downdating algorithm of the QR decomposition for a reduced modal matrix. Traditional computations of the Effective Independence, which tries to render the target modes as linearly independent at possible and is significant and influential in the field of sensor placement, require the eigenvalue decomposition or inversion of the Fisher Information matrix, and both are costly. By virtue of the connection between the Modal Kinetic Energy and Effective Independence derived by the authors, the norms of the orthonormal rows after the QR decomposition of the modal matrix can be employed to compute the Effective Independence. Moreover, new downdating steps of the QR decomposition based on the combination of the modified Gram-Schmidt and Householder transformations are implemented, which further improved its efficiency by eliminating unnecessary expensive QR decompositions in the iterations. The computational burden for traditional methods and the proposed ones are investigated in terms of the floating point operations required. Finally, numerical tests on the I-40 Bridge shows that the new algorithms run much more quickly with fewer computation steps, has the advantages of simplicity and clarity in physical significance, and is stable. © 2009 Society for Experimental Mechanics Inc.

关键词： Fisher information matrix

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