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Steady-state analysis of soft and hard-switched DC/DC converters

EUROPEAN TRANSACTIONS ON ELECTRICAL POWER 1996年第3期6卷 163-168页

作者： Pinola, L Rotta, E Testa, L Varoli, V Dr.-Ing. Licia Pinola (1960) received the Doctor degree in Nuclear Engineering and the Ph.D. degree in Electrical Science from the “Politecnico di Milano” Mildtaly in 1986 and 1990 respectively. Her research and and professional interests are in the fields of Power Electronics (dynamics of DC/DC switched power converters) A.I. techniques (expert systems) for on-line diagnosis of electrical systems and machines and non-linear system theory. (Politecnico di Milano Dipartirnento di Elettrotecnica Piazza Leonardodavinci 32.1-20133 Milano/ltaly T+*** Fax + ***) Dr.-Ing. Egidio Rotta (1963) received the Doctor degree in Nuclear Engineering from the “Politecnico di Milano” Milan/Italy in 1992. He is following the 3rd year of the 8th cycle of Doctorate in Nuclear Sciences at the “Politecnico di Milano”. His research and professional interests are i n the field of Power Electronics (dynamics of DC/DC switched power converters high power PWM converters converter topologies. high efficiency QR converters). (Politecnico di Milano Ce SNEF Via Ponzio 3413 1-20133 Milano/Italy T + 392/23996393 Fax +392/23996309) Dr.-lng. Livia Testa (1964) received the Doctor degree in Nuclear Engineering from the “Politecnico di Milano” Milafltaly in 1993. Her main interests are in the field of Power Electronics (device simulations QR converters). (Politecnico di Milano. Dip. Ingegneria Nucleare Via Ponzio 3413 1-20133 Milandtaly T +392/23996393 Fax + 392/23996309) Prof. Vincenzo Varoli (1945) received the B.S. degree in Nuclear Engineering from the Universiti Politecnico di Milano Milan/Italy in 1969. Since then he worked in the Electronics Laboratory of the Institute of Nuclear Engineering of the Politecnico di Milano and he was involved in the design of low-noise charge preamplifiers precision pulse generators acoustic emission processing chains and isolated acquisition systems. His present research activity is devoted to the analysis and modelling of power processor and to the optimization of their control. He

A methodology for the accurate steady-state analysis of soft-switched (quasi-resonant) DC/DC converters is described. It consists in a two-steps procedure: a simplified analysis provides the initial values to an iterative algorithm which improves the accuracy of the results up to the required level. Symbolic mathematics packages make it possible to apply a rigorous approach also to the high-order networks typical of quasi-resonant converters. The procedure is validated by comparison of its outputs to experimental results.

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ANDECS-Multicriteria Optimization of a Fuzzy-Logic controller for an Aerodynamically Unstable Aircraft in Comparison to a Linear Robust control Design

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IFAC Proceedings Volumes 1995年第23期28卷 107-112页

作者： H.-D. Joos DLR-Oberpfaffenhofen Control Design Engineering Institute for Robotics & System Dynamics D-82230 Wessling Germany

The performance benefits of an aerodynamically unstable aircraft are obtained at the expense of the necessity of an automatic control system. For reliability requirements controllers without gain scheduling are looked for. To achieve this a complex ”robust control” design problem has to be solved. Fuzzy-controllers are claimed to have robustness properties. On the other hand the fuzzy-control methodology can be seen as a systematic way to specify controllers with nonlinear gain surfaces. To properly tune such controllers, computer-aided techniques can be applied provided appropriate models are available such as in more classical design approaches. A fuzzy-controller is developed, which keeps an aerodynamically unstable aircraft stationary for a sufficient long range of time and providing good flying qualities over the entire flight envelope. The results are compared with a completely linear controller design, done earlier.

关键词： Fuzzy-Logic controller Optimization Multi-Objective Design

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ANDECS Robot-Trajectory Optimization for State-Constrained Time-Optimal control and Minimum Power Consumption

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IFAC Proceedings Volumes 1995年第23期28卷 101-106页

作者： A. Lewald M. Otter G. Grübel DLR-Oberpfaflenhofen Control Design Engineering Institute for Robotics & System Dynamics D-82230 Wessling Germany

The robot trajectory optimization features of the ANDECS environment are described. Robot trajectory optimization problems are formulated as multi-objectives parameter optimization problems in search for a good compromise among conflicting criteria, such as “minimal” time and “minimal” power consumption. For that the robot dynamics is analyzed by time-simulation of a robot model with variable structure, which is generated by the object-oriented modeling language Dymola.

关键词： Computer simulation Industrial Robots Nonlinear Programming Optimization Robots Trajectory planning

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The ANDECS Framework for Computational system dynamics Integration

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IFAC Proceedings Volumes 1995年第23期28卷 89-94页

作者： G. Grübel J. Bals R. Finsterwalder H.-D. Joos M. Otter DLR-Oberpfaffenhofen Control Design Engineering Institute for Robotics & System Dynamics D-82230 Wessling Germany

Integrated systems engineering is essential in design-concept validation. In particular, computer-aided procedures for system dynamics integration beyond mere functional integration are necessary in order to neither underestimate nor to overestimate design-safety margins. At hand of the open system-dynamics integration environment ANDECS (ANalysis & DEsign of controlled systems), we deal with concepts and realized features of a framework for computational experimenting in system-dynamics design and evaluation. This paper is the lead paper to four companion papers which together form a case study on applied multidisciplinary dynamics design experimenting.

关键词： Computer-Aided Compromising system dynamics engineering Software Framework

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ANDECS Computational Experimenting with the IAVSD Car-Suspension Benchmark ILTIS

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IFAC Proceedings Volumes 1995年第23期28卷 95-99页

作者： W. Schwartz H.-D. Joos DLR-Oberpfaffenhofen Vehicle Systems Dynamics Institute for Robotics & System Dynamics D-82230 Wessling Germany DLR-Oberpfaffenhofen Control Design Engineering Institute for Robotics & System Dynamics D-82230 Wessling Germany

Nonlinear vehicle system dynamics plays an important role in the development and the assessment of active suspension control systems. The current way of designing active suspension control systems mostly uses simplified models, in order to to apply analytical synthesis methods or to achieve low complexity of the controller when using such methods. However, advanced vehicle design require methodologies, that can deal with more complex vehicle models, as a step towards integrated design. Multi-objective control design is such a methodology, that is open to cope with any controller structure and arbitrary kind of models. In this case study the usefulness of this methodology is investigated by designing an actively controlled vehicle suspension with and without preview for the IAVSD benchmark model ILTIS. The full nonlinear model is used for design. The ’nonlinear’ results are compared to the results of a ’linear’ design, based on linearized vehicle models.

关键词： Computer-Aided Multi-Objective Design Vehicle system dynamics Automotive Car-Suspensions

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An ANDECS-MATLAB Multicriteria Design for a Maglev Vehicle Comparing a ’Classical’ and a ’Modern’ control Structure

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IFAC Proceedings Volumes 1995年第23期28卷 113-118页

作者： J. Bals J.E. Paddison DLR-Oberpfaffenhofen Control Design Engineering Institute for Robotics & System Dynamics D-82230 Wessling Germany Loughborough University of Technology Department of Electronic and Electrical Engineering Loughborough UK

For a low speed Maglev system of the single stage suspension type a control design study is described where a ’classical’ dynamic compensator control structure is compared with a ’modern’ LQG control structure. To properly tune the free parameters in the respective controller synthesis procedures the ANDECS-MATLAB design environment is used. The multi-objective design approach of ANDECS allows to simultaneously satisfy the suspension requirements corresponding to both random and deterministic inputs.

关键词： Computer-Aided Multi-Objective Design Magnetic Suspension Transportation

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A STABILIZED FAST TRANSVERSAL FILTERS ALGORITHM FOR RECURSIVE LEAST-SQUARES ADAPTIVE FILTERING

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SIGNAL PROCESSING 1994年第3期39卷 235-246页

作者： REN, ZY SCHUTZE, H Institute of Control Engineering and System Dynamics Technische Universität Berlin Einsteinufer 17 10587 Berlin Germany Research and Technology Centre Deutsche Bundespost TELEKOM Ringbahnstraβe 130 12103 Berlin Germany

In this paper, the numerical stability of the well known gain-normalized fast transversal filters (GFTF) algorithm is analytically investigated. Starting from an analysis of the error propagation, suitable round-off errors difference equations (REDE) are derived. The stabilization of the GFTF algorithm can be achieved by stabilizing the REDE. The resulting algorithm is numerically stable, having only 7N + 27 multiplications and divisions per recursion (MADPR). The numerical stability of the proposed algorithm is demonstrated by the simulation results.

关键词： FAST RECURSIVE LEAST SQUARES ALGORITHM ADAPTIVE TRANSVERSAL FILTER ADAPTATION IDENTIFICATION STABILITY ACOUSTIC ECHO CANCELER

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The ANDECS-Matlab environment for databased computational control experimenting

The ANDECS-Matlab environment for databased computational co...

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IEEE International Symposium on Computer Aided control system Design (CACSD)

作者： J. Bals H.-D. Joos G. Grubel Control Design Engineering Institute for Robotics and System Dynamics DLR-Oberpfaffenhofen Wessling Germany

The ANDECS-Matlab environment provides two alternatives for databased computational experimenting using Matlab: The module Amatlab is a re-implementation of the classic matlab syntax to be used for interactive specification of matrix calculations in modular computation sequences. This syntax is extended to allow database access for data communication with other databased modules. Alternatively, the module PROMAT allows one to use commercial MATLAB via process communication with online data transfer between the ANDECS database and the MATLAB workspace in both directions. This allows a convenient use of the matlab syntax and a coherent integration of M-file Toolboxes in any module sequence of the control-engineering software environment ANDECS.< >

关键词： MATLAB Design engineering Data engineering Communication system control Mathematical model Spatial databases Visual databases control design Packaging Trademarks

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ANDECS: a computation environment for robot-dynamics design automation

ANDECS: a computation environment for robot-dynamics design ...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： G. Grubel R. Finsterwalder H.-D. Joos A. Lewald M. Otter DLR Oberpfaffenhofen Control Design Engineering Institute for Robotics and System Dynamics Wessling Germany

Features of an available computation environment for robot-dynamics design are described. These are environments for object-oriented mechatronics/robot dynamics modeling, for executing dynamics simulation experiments, for multiobjective parameter and trajectory optimization, and for multivariate result visualization. The environments have a common look and feel and are coherently integrated using an engineering database system.< >

关键词： Robotics and automation Design automation Object oriented modeling Mechatronics Design engineering systems engineering and theory Physics computing Robots Computational modeling Data engineering

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A graphical matrix editor to be used in ANDECS/MATLAB computation environments

A graphical matrix editor to be used in ANDECS/MATLAB comput...

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IEEE International Symposium on Computer Aided control system Design (CACSD)

作者： R. Finsterwalder E.G. Berger G. Grubel Control Design Engineering Institute for Robotics and System Dynamics DLR-Oberpfaffenhofen Wessling Germany

Application and programming aspects of a portable graphical matrix editor are described. The editor is realized based on the X-Windows/Motif user interface library. It can be used as a stand-alone matrix data input and-display facility which is independent of a particular programming system. It can also be used as a module within interactive computation environments, like ANDECS or MATLAB, using client/server process communication or the MEX-file facility of MATLAB.< >

关键词： MATLAB Graphical user interfaces Computer interfaces Portable computers Dynamic programming Communication system control control systems Character recognition Trademarks control design

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