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Maximally Permissive Distributed Supervisory control of Nondeterministic Discrete-Event systems

Maximally Permissive Distributed Supervisory Control of Nond...

引用

IEEE Conference on Decision and control

作者： Rong Su Jan H. van Schuppen Jacobus E. Rooda Division of Control and Instrumentation School of Electrical and Electronic Engineering Nanyang technological University 50 Nanyang Avenue Singapore 639798 Systems Engineering Group in the Department of Mechanical Engineering Eindhoven University of Technology PO Box 513 5600 MB Eindhoven The Netherlands Centrum voor Wiskunde en Informatica (CWI) P.O. Box 94079 1090 GB Amsterdam The Netherlands

ISBN: (纸本)9781612848006

In supervisor synthesis achieving nonblockingness is a major computational challenge for a large system. In the literature several automaton-based distributed synthesis approaches have been proposed, in which the plant is modeled by a collection of nondeterministic finite-state automata and the requirement and the final distributed supervisor are modeled by a collection of deterministic finite-state automata. In this paper we provide a sufficient condition, which guarantees maximal permissiveness of the synthesized distributed supervisor.

关键词： discrete-event systems nondeterministic finite-state automata automaton abstraction distributed supervisor synthesis maximal permissiveness

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Performance of discrete time sliding mode controller with data fusion

Performance of discrete time sliding mode controller with da...

引用

2010 11th International Workshop on Variable Structure systems, VSS 2010

作者： Arunshankar, J. Umapathy, M. Bandhopadhyay, B. Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore - 641 004 India Department of Instrumentation and Control Engineering National Institute of Technology Tiruchirappalli - 620 015 India Systems and Control Engineering Indian Institute of Technology Bombay Mumbai - 400 076 India

ISBN: (纸本)9781424458318

This work aims in evaluating the closed loop performance of reaching law based discrete time sliding mode controller with multisensor data fusion (MSDF). The work considers six different fusion algorithms, to measure and control the structural vibration of piezo actuated cantilever beam. The vibration is measured using two piezo homogeneous sensors. Each sensor output uses separate estimator, for generating the states, which are then fused. The linear dynamic model identified using linear Recursive Least Square (RLS) method based on ARX model is used to illustrate the effectiveness of closed loop performance with data fusion, as compared to the single sensor case. © 2010 IEEE.

关键词： Least squares approximations

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Model-based fatigue identification of NiTiCu shape memory alloys under thermomechanical cyclic loading

Model-based fatigue identification of NiTiCu shape memory al...

引用

7th Annual International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2010

作者： Lekhakul, P. Wongsa, S. Koolpiluck, D. Khantachawana, A. Department of Control Systems and Instrumentation Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand Department of Mechanical Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

ISBN: (纸本)9789746724913

This work investigates the use of model-based techniques to identify functional fatigue stages of SMA when used as actuators. The model-based technique enables an on-line identification of fatigue level of SMA actuators, in comparison with off-line conventional fatigue analysis techniques, such as SEM and TEM. The models are identified by linearisation of three equations - the model of phase transformation, the temperature dynamics described by Joules heat-convectional cooling, and a constitutive equation relating changes in stress, strain, temperature, and mole fraction. Residues are defined as a function of simulated error and used in the decision rule to identify the fatigue level of the tested wire. The tested specimens are NiTiCu SMA drawn in 0.7 millimeter diameter wires. The materials are loaded with a constant weight under various thermal cycling, producing a set of SMA wires with different fatigue levels. The proposed fatigue identification approach has been tested with the specimens being subjected to a range of stress from 76 MPa to 204 MPa. Results show that the accuracy of the proposed method has been found to be at least 93% for all loading conditions.

关键词： Wire

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Mechanical modeling and geometric error analysis of rotatable h type stage using flexure hinge mechanism 10

Mechanical modeling and geometric error analysis of rotatabl...

引用

10th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2010

作者： Kim, Kyongchon Gweon, D.G. Jung, J. Kim, J.W. Shin, S.K. School of Mechanical Aerospace and Systems Engineering Korea Advanced Institute of Science and Technology Korea Republic of Department of Control and Instrumentation Engineering Korea University Korea Republic of Soonhan Engineering Sungnam-si Korea Republic of

ISBN: (纸本)9780955308284

The geomatric errors in the precision stage have increased as the LCD pannel size increased. The yaw error of the gemometric error caused by geometric error between tandem motors is dominant error in the H type stage. The rotatable stage with flexure hinge mechanism can be thought to compenate the yaw error. This paper dedicated to determine dynamic modeling of roatatable stage. The geometric errors of the rotatable stage was analyzed by HTM(Homogeneous Transformation Matrix).

关键词： Errors

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Ultrasonic vibration mechanism with PZT and flexure spring for ultraprecision laser machining 10

Ultrasonic vibration mechanism with PZT and flexure spring f...

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10th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2010

作者： Kim, Hyun-Uk Hwang, Donghyun Kim, Moo-Jong Lee, Ji-Hoon Hong, Min-Sung Cho, Sung-Hak Jeong, Jaehwa Lee, Moon G. Division of Mechanical Engineering Ajou University Korea Republic of Nano-mechanical Systems Korea Institute of Machinery and Materials Deajon Korea Republic of Department of Control and Instrumentation Engineering Korea University Korea Republic of

ISBN: (纸本)9780955308284

The increase in the human life span has stimulated the research and development of several medical instruments and devices. Among the devices, a drug delivery stent is a medical device that requires ultraprecision machining. However, a conventional drug delivery stent contains residual polymer, which tends to coat the surface of the stent. This problem can be prevented by impregnating the drug in a microsized hole on the surface, thereby eliminating the use of the polymer in the process. Microsized holes are generally fabricated by laser machining, however, the fabricated microsized holes do not have a high aspect ratio or a good surface finish. To overcome these problems, we propose the use of PZT (Piezoelectric Transducers) for the fabrication of microsized holes. The ultrasonic vibration from the PZT vibrates the laser beam in a vertical direction, which results in the fabrication of microsized holes with a higher aspect ratio and better surface finish than those obtained by conventional laser machining. The proposed mechanism vibrates the eyepiece of laser optics. In addition to the abovementioned advantages, the proposed mechanism facilitates high precision and flexibility. It decreases the number of burrs and amount of debris produced during machining. Moreover this mechanism can be used to machine microsized holes in various materials. The laser used in the proposed mechanism has a high frequency and large travel range. A finite element method (FEM) simulation is used to determine the PZT motion and to analyze the sensitivity of the design parameters. This analysis reveals that the target frequency and a high amplitude can be obtained in the target vibration mode without parasitic motion.

关键词： controlled drug delivery

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Simultaneous periodic output feedback control of a smart cantilever beam with data fusion

Simultaneous periodic output feedback control of a smart can...

引用

IEEE Conference on Robotics, Automation and Mechatronics

作者： J. Arunshankar M. Umapathy Department of Instrumentation & Control Systems Engineering PSG College of Technology Coimbatore India Department of Instrumentation & Control Engineering National Institute of Technology Tiruchirappalli India

ISBN: (纸本)9781424465033;9781424465064

This paper presents the design and simulation of simultaneous periodic output feedback controller to minimize structural vibration using piezoelectric actuator and sensor. The vibrating modes are measured by two homogeneous piezoelectric sensors. Sensors output are applied to individual information filters for estimating the states and the states generated by these filters are fused, which is applied as input to the controller. The performance of the controller is evaluated by considering three smart cantilever beams which differ in length and mass. The controller is simulated by exciting the structures at resonance and it is observed that, data fusion improves the closed loop response of the system, as compared to the response obtained with single sensor.

关键词： Output feedback Structural beams Intelligent sensors Sensor fusion Information filters Vibration control Piezoelectric actuators Vibration measurement State estimation Fusion power generation

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Performance of discrete time sliding mode controller with data fusion

Performance of discrete time sliding mode controller with da...

引用

International Workshop on Variable Structure systems, VSS

作者： J. Arunshankar M. Umapathy B. Bandhopadhyay Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore India Department of Instrumentation and Control Engineering National Institute of Technology Tiruchirapalli India Systems and Control Engineering Indian Institute of Technology Bombay Mumbai India

关键词： Sliding mode control Sensor fusion Vibration measurement Intelligent sensors Vibration control Optical materials Shape control control systems Instruments control engineering

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VVAF - Worst case & safety analysis tools for autonomous rendezvous system

VVAF - Worst case & safety analysis tools for autonomous ren...

引用

AIAA Guidance, Navigation, and control Conference

作者： Paulino, Nuno Di Sotto, Emanuele Salehi, Sohrab Kron, Aymeric Hamel, Jean-François Wang, Wenfei Menon, Prathyush P. Bates, Declan G. Papachristodoulou, Antonis Maier, Christoph GMV Tres Cantos Madrid Spain Rhea System at ESA-ESTEC Noordwijk Netherlands NGC Aerospace Mouans Sartoux France NGC Aerospace Sherbrooke Canada Control and Instrumentation Research Group Department of Engineering University of Leicester Leicester United Kingdom Department of Engineering Science University of Oxford Oxford United Kingdom Institute for Systems Theory and Automatic Control University of Stuttgart Stuttgart Germany

ISBN: (纸本)9781600869624

The traditional verification and validation (V&V) process can produce sufficiently safe and reliable systems in the demanding aerospace field. But this comes at great cost and effort, with the necessary simulation of all possible operational conditions for increasingly complex control systems involving substantial autonomy. It is of interest to go beyond the statistical confidence of traditional Monte Carlo methods. New V&V methods need to cope with a large number of mission parameters and mode transitions. They must identify the worst combinations of perturbations, uncertainties and failures. Two classes of frameworks are investigated in the VVAF project: integrated V&V frameworks (IVVF) supported by simulation based analysis techniques, either integrated or with local analysis techniques to establish the global system properties;and enhanced V&V frameworks (EVVF), based on mathematical proof. Two EVVF techniques are explored: Barrier-construction and Reachability-set analysis. These guarantee fulfillment of globally exact safe operation, by the construction of barrier certificates considering nonlinearities, uncertainties and constraints. In addition, two IVVF techniques are developed: Analytical-based (AIVV) and Optimization-based (OIVV). AIVV consists of integrating and embedding frequency domain LFT-based mu-analysis techniques to exclude regions with guaranteed performance and/or identify the most critical areas, within a Monte Carlo simulation based V&V. With as few runs as possible of the non linear time simulator, local analyses can steer the global search towards the worst case. OIVV uses optimization techniques, also linked to the simulator, to identify and characterize the system worst case. Several heuristic techniques are evaluated for global parameters search, which is then refined using local optimization techniques to locate and characterize the worst case. The AIVV can also aid the OIVV by identifying search regions and promising initialization poi

关键词： Monte Carlo methods

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Feedback stabilization and motion synchronization of systems with time-delay in the communication network

Feedback stabilization and motion synchronization of systems...

引用

9th IFAC Workshop on Time Delay systems, TDS 2010

作者： Lombardi, Warody Luca, Anamaria Olaru, Sorin Niculescu, Silviu-Iulian Cheong, Joono 3 rue Joliot Curie 91192 Gif-sur-Yvette France Laboratory of Signals and Systems SUPELEC-CNRS 3 rue Joliot Curie 91192 Gif-sur-Yvette France Department of Control and Instrumentation Engineering Korea University Jochiwon 339-700 Korea Republic of

ISBN: (纸本)9783902661715

This paper is dedicated to the stabilization problem of dynamical systems in the presence of variable time-delay in the communication channel which is handled at the discretization stage by means of a guaranteed uncertainty approximation technique. In this context, the proposed stabilization methodology will be based on a Lyapunov-Krasovskii candidate leading finally to Linear Matrix Inequalities formulations for the controller synthesis. The motion synchronization control of two interconnected subsystems linked by a network is considered a possible application of these techniques.

关键词： Synchronization

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Model-based fatigue identification of NiTiCu shape memory alloys under thermomechanical cyclic loading

Model-based fatigue identification of NiTiCu shape memory al...

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International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： P. Lekhakul S. Wongsa D. Koolpiluck A. Khantachawana Department of Control Systems and Instrumentation Engineering King Mongkut''s University of Technology Thonburi Bangkok Thailand Department of Mechanical Engineering King Mongkut''s University of Technology Thonburi Bangkok Thailand

ISBN: (纸本)9781424456062;9789746724913

This work investigates the use of model-based techniques to identify functional fatigue stages of SMA when used as actuators. The model-based technique enables an online identification of fatigue level of SMA actuators, in comparison with off-line conventional fatigue analysis techniques, such as SEM and TEM. The models are identified by linearisation of three equations - the model of phase transformation, the temperature dynamics described by Joules heat-convectional cooling, and a constitutive equation relating changes in stress, strain, temperature, and mole fraction. Residues are defined as a function of simulated error and used in the decision rule to identify the fatigue level of the tested wire. The tested specimens are NiTiCu SMA drawn in 0.7 millimeter diameter wires. The materials are loaded with a constant weight under various thermal cycling, producing a set of SMA wires with different fatigue levels. The proposed fatigue identification approach has been tested with the specimens being subjected to a range of stress from 76 MPa to 204 MPa. Results show that the accuracy of the proposed method has been found to be at least 93% for all loading conditions.

关键词： Fatigue Shape memory alloys Thermomechanical processes Testing Actuators Equations Temperature Wires Numerical analysis Cooling

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