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IEEE Conference on Vehicle Power and Propulsion (VPPC)

作者： Jonathan Brembeck Ricardo De Castro Jakub Tobolář Iman Ebrahimi German Aerospace Center (DLR) Institute of System Dynamics and Control (SR) Oberpfaffenhofen Germany Dept. of Mechanical Engineering University of California Merced

ISBN: (纸本)9781665475884

This article presents a benchmark problem that researchers can use to evaluate the performance of energy management algorithms for multi-energy source and multimotor electric vehicles. The model makes use of Modelica, an open source, a-causal, object-oriented language for modeling cyber-physical systems in multi-domains (e.g. electrical, mechanical, thermal) of the vehicle components. The model also includes the aspect of three-dimensional mechanics, which enables completely new degrees of freedom in the controller design in comparison to one-dimensional approaches. To support interoperability among multiple design tools, the Modelica vehicle model is provided as a Functional Mockup Unit, an industry standard for exchange of simulation models. A set of standardized input-output interfaces and key performance metrics is also provided in the benchmarking problem, enabling the systematic ranking of multiple energy management strategies.

关键词： Solid modeling systematics Object oriented modeling Heuristic algorithms Benchmark testing Propulsion Energy management

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Epidemic management with admissible and robust invariant sets

arXiv

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arXiv 2021年

作者： Esterhuizen, Willem Lévine, Jean Streif, Stefan Technische Universität Chemnitz Automatic Control and System Dynamics Laboratory Germany Maths & Systems Dept. MINES ParisTech PSL University France

We present a detailed set-based analysis of the well-known SIR and SEIR epidemic models subjected to hard caps on the proportion of infective individuals, and bounds on the allowable intervention strategies, such as social distancing, quarantining and vaccination. We describe the admissible and maximal robust positively invariant (MRPI) sets of these two models via the theory of barriers. We show how the sets may be used in the management of epidemics, for both perfect and imperfect/uncertain models, detailing how intervention strategies may be specified such that the hard infection cap is never breached, regardless of the basic reproduction number. The results are clarified with detailed *** Codes 34H05 (primary), 92D30 (secondary), 37N35, 37N25 © 2021, CC BY-NC-ND.

关键词： Cell proliferation

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Partial Pole Placement using Static Output Feedback

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IFAC-PapersOnLine 2020年第2期53卷 4527-4533页

作者： Manuel Pusch Julian Theis Daniel Ossmann Institute of System Dynamics and Control German Aerospace Center (DLR) 82234 Weßling Germany Institute of Aircraft Systems Engineering Hamburg University of Technology 21129 Hamburg Germany Dept. of Mechanical Automotive and Aeronautical Engineering Munich University of Applied Sciences 80335 Munich Germany

For many dynamical systems it is required to specifically shift individual poles, especially when these poles are lightly damped or even unstable. To achieve that, a preferably large number of effectors and measurements are installed leading to multivariable control problems. In this paper, a novel control approach is presented for placing either a single pole or a conjugate complex pole pair at a predefined location using rank-one static output feedback. Rank-one feedback can be interpreted as blending inputs and outputs to define a single input and single output loop with a desirable root locus along which the pole is moved. The corresponding controller synthesis is reduced to an unconstrained optimization problem in a single variable that aims at minimizing the feedback gain. Although the approach is derived for a single pole or conjugate complex pole pair, it is easily extended to multiple poles. To this end, a repeated design and superposition of rank-one feedback gains is proposed. It is further shown how residual system dynamics as well as subsequently designed gains can be efficiently decoupled from each other in order to avoid undesired interactions and spillover effects. The effectiveness of the proposed control approach is demonstrated by means of a numerical example.

关键词： static feedback control multivariable systems pole assignment blending of inputs outputs modal control

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Methods and Tools for Automation of Development of Information systems Using Specifications of Database Applications

Methods and Tools for Automation of Development of Informati...

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Russia and Pacific Conference on Computer Technology and Applications (RPC)

作者： I.V. Bychkov A.E. Hmelnov E.S. Fereferov G.M. Rugnikov A.S. Gachenko Information Technology and Systems Dept. Matrosov Institute for System Dynamics and Control Theory of Siberian Branch of Russian Academy of Sciences Irkutsk Russia

ISBN: (纸本)9781538675328

The approach is based upon declarative specifications of database applications (SDA). The specifications of database applications contain all the information about database structure, which is required to build a typical AIS (automated information system). The information is represented in its pure form, so the specifications are rather concise. The AIS'es are implemented using general algorithms, which are directed by the specifications. We have developed algorithms for such tasks as: user interface generation, query building, report generation, GIS interaction. Using the specifications of database applications and the algorithms the software system GeoARM was implemented. The technology considered was well-tried by use of the system GeoARM for development of several dozens of true-life AIS for different purposes.

关键词： Databases Artificial intelligence Software User interfaces Software algorithms Task analysis Information systems

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Services and Cloud Infrastructure to Support Interdisciplinary Scientific Research

Services and Cloud Infrastructure to Support Interdisciplina...

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Russia and Pacific Conference on Computer Technology and Applications (RPC)

作者： I.V. Bychkov G.M. Rugnikov R.K. Fedorov A.S. Shumilov Information Technology and Systems Dept. Matrosov Institute for System Dynamics and Control Theory of Siberian Branch of Russian Academy of Sciences Irkutsk Russia

ISBN: (纸本)9781538675328

The problem of open information exchange substantiates the perspective of SOA paradigm for the creation of infrastructure that supports interdisciplinary research. The infrastructure solves problems of service and data cataloging, publication and multiuser editing of data, deployment and execution of services and theirs compositions. The developed infrastructure effectively utilizes resources, adapts to environment changes and solves problems in biology, geography and ecology sciences.

关键词： Task analysis Standards Planning Computer languages Software systems Servers

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Soil Modeling for InSight's HP3-Mole: From Highly Accurate Particle-Based towards Fast Empirical Models 15

Soil Modeling for InSight's HP3-Mole: From Highly Accurate P...

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15th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, Earth and Space 2016

作者： Lichtenheldt, Roy Krömer, Olaf Institute of System Dynamics and Control Dept. of Space System Dynamics Münchener Straße 20 Weßling82234 Germany Institute of Space Systems Robert-Hooke-Straße 7 Bremen28359 Germany

ISBN: (纸本)9780784479971

As a payload of NASA's discovery mission InSight, DLR's HP3-instrument is used to measure the internal heat flow of Mars. In order to reach the maximum penetration dept. of 5 m HP3's locomotion system, the self-impelling nail nicknamed "the Mole" will hammer itself into the Martian subsurface. In order to improve, optimize, and analyze the Mole's dynamic behaviour and its interaction with the soil, several models were developed. In the article, the enhanced multi-body model of the mechanism will be presented in combination with two soil models used during the mission's development phase. A highly precise particle model is used to analyze the dynamic interaction with the mechanism, as well as to enhance the simple but fast analytical soil model based on soil mechanics. Both techniques will be explained, and the transfer of effects from detailed models to simple models will be shown. © 2016 American Society of Civil Engineers.

关键词： Soil mechanics

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Robust decentralized control of large-scale systems via H∞theory and using descriptor system representation

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International Journal of systems Science 2016年第12-13期34卷 705-715页

作者： Labibi, B. Lohmann, B. Sedigh, A. Khaki Maralani, P. Jabedar Control Department Electrical Engineering Faculty K. N. Toosi University of Technology Seyyed Khandan Bridge Shariati Street 16314 Iran Dept. of System Dynamics and Control University of Bremen Otto-Hahn-Allee/NW1 28359 Bremen Germany Electrical and Computer Eng. Dept. Faculty of Engineering University of Tehran North Karegar Street Building No. 2 Tehran Iran

In this paper, a method for design of linear decentralized robust controllers for a class of uncertain large-scale systems in general form is presented. For a given large-scale system, an equivalent descriptor system in input-output decentralized form is defined. Using this representation, closed-loop diagonal dominance sufficient conditions are derived. It is shown that by appropriately minimizing the weighted sensitivity function of each isolated subsystem, these conditions are achieved. Solving the appropriately defined H∞local problem for each isolated uncertain subsystem, the interactions between the subsystems are reduced, and the overall stability and robust performance are achieved in spite of uncertainties. The designs are illustrated by a practical example.

关键词： control system synthesis

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Multi-level power quality assessment towards virtual testing of more electric aircraft

Multi-level power quality assessment towards virtual testing...

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International Power Engineering Conference (IPEC)

作者： Yang Ji Johann Bals A. Pfeiffer Department of System Dynamics and Control German Aerospace Center Muenchnerstr Germany Dept. of Syst. Dynamics & Control German Aerosp. Center Wessling Germany

This paper introduces a multi-level power quality assessment approach towards virtual testing of more electric aircraft. Three levels with increasing accuracies are rough, approximated and exact power quality assessment. The requirement to the accuracy of power quality assessment strongly depends on different analysis jobs. With the multi-level power quality assessment approach, both sufficient accuracy and minimal cost can be ensured. Advanced steady-state analysis approaches for the switched power electronic systems with regard to the exact power quality assessment are introduced. The convergence performance of the applied steady-state analysis approaches is significantly improved by estimation of the state variables at steady-state using a generalized averaging technique. The proposed approach that has been implemented in Dymola is demonstrated by a pulse width modulated buck converter.

关键词： Harmonic analysis Power quality Mathematical model Optimization Steady-state Analytical models Power system harmonics

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Coverage control with Information Decay in Dynamic Environments

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IFAC Proceedings Volumes 2008年第2期41卷 4180-4185页

作者： Nico Hübel S. Hirche A. Gusrialdi T. Hatanaka M. Fujita O. Sawodny Institute for System Dynamics Universität Stuttgart Fujita Laboratory Dept. of Mechanical and Control Engineering Tokyo Institute of Technology

In this paper a method for coverage control for a convex region D ⊂ ℝ 2 in a dynamic environment is studied. An information map is introduced in which the information about each point is decaying with respect to time s.t. the robots must revisit them periodically. Also a time-varying density function is used for modeling moving points of interest. The considered gradient based control approach causes the cost function to stay within the desired bounds. But due to the non-stationary problem setup caused by the information decay it does not converge to a single point but to a bounded set, such that the robots keep gathering information continuously. With this method it is possible to gather information about several points of interest within the region D with only a few robots. In the end simulation results are presented to outline the effectiveness of the proposed control law.

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Periodic optimal control for solar aircraft with unlimited endurance capability

Periodic optimal control for solar aircraft with unlimited e...

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作者： Sachs, G. Lenz, J. Holzapfel, F. Technische Universität München Boltzmannstr. 15 85747 Garching Germany Dept. of Flight Mechanics and Flight Control United States Institute of Flight System Dynamics United States

ISBN: (纸本)9781563479458

The possibility of an unlimited flight endurance of solar aircraft is treated with the objective to maximize their performance. This is a periodic optimal control problem because the trajectory is continued after a one-day flight in the same manner as before. Focus of the performance goal is the minimization of the required battery capacity so that the related weight penalty can be kept as small as possible. Realistic mathematical models of the dynamics of the aircraft and the energy management system for an optimal utilization of the solar energy are applied. With the use of an efficient optimization method, results on periodic optimal solar aircraft trajectories yielding the performance enhancement aimed at are presented. Copyright © 2008 by G. Sachs.

关键词： Energy management systems

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