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Flights are ten a sail - Re-use and commonality in the design and system engineering of small spacecraft solar sail missions with modular hardware for responsive and adaptive exploration 70

Flights are ten a sail - Re-use and commonality in the desig...

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70th International Astronautical Congress, IAC 2019

作者： Grundmann, Jan Thimo Bauer, Waldemar Boden, Ralf Ceriotti, Matteo Chand, Suditi Cordero, Federico Dachwald, Bernd Dumont, Etienne Grimm, Christian D. Heiligers, Jeannette Hercík, David Hérique, Alain Ho, Tra-Mi Jahnke, Rico Kofman, Wlodek Lange, Caroline Lichtenheldt, Roy McInnes, Colin Meß, Jan-Gerd Mikschl, Tobias Mikulz, Eugen Montenegro, Sergio Moore, Iain Pelivan, Ivanka Peloni, Alessandro Plettemeier, Dirk Quantius, Dominik Reershemius, Siebo Renger, Thomas Riemann, Johannes Rogez, Yves Ruffer, Michael Sasaki, Kaname Schmitz, Nicole Seboldt, Wolfgang Seefeldt, Patric Spietz, Peter Spröwitz, Tom Sznajder, Maciej Tóth, Norbert Vergaaij, Merel Viavattene, Giulia Wejmo, Elisabet Wiedemann, Carsten Wolff, Friederike Ziach, Christian DLR German Aerospace Center Institute of Space Systems Robert-Hooke-Str. 7 Bremen28359 Germany Consultants to DLR Institute of Space Systems University of Glasgow GlasgowG12 8QQ United Kingdom Telespazio-VEGA Darmstadt Germany Faculty of Aerospace Engineering FH Aachen University of Applied Sciences Hohenstaufenallee 6 Aachen52064 Germany Institute for Geophysics and Extraterrestrial Physics Technical University Braunschweig Germany Université Grenoble Alpes CS 40700 Grenoble Cédex 938058 France DLR German Aerospace Center Robotics and Mechatronics Center Weßling82234 Germany Informatik 8 Universität Würzburg Am Hubland Würzburg97074 Germany Fraunhofer Heinrich Hertz Institute Berlin Germany Dresden University of Technology RF Engineering Dresden Germany DLR German Aerospace Center Institute of Planetary Research Rutherfordstr. 2 Berlin12489 Germany DLR German Aerospace Center Institute of System Dynamics and Control Wessling82234 Germany Space Research Centre PAS Warsaw Poland TU Delft Delft Netherlands Institute of Space Systems Technische Universität Braunschweig Hermann-Blenk-Str. 23 Braunschweig38108 Germany

The exploration of small solar system bodies started with fast fly-bys of opportunity on the sidelines of missions to the planets. The tiny new worlds seen turned out to be so intriguing and different from all else (and each other) that dedicated sample-return and in-situ analysis missions were developed and launched. Through these, highly efficient low-thrust propulsion expanded from commercial use into mainstream and flagship science missions, there in combination with gravity assists propulsion. In parallel, the growth of small spacecraft solutions accelerated in numbers as well as individual spacecraft capabilities. The on-going missions OSIRIS-REX (NASA) or HAYABUSA2 (JAXA) with its landers MINERVA-II and MASCOT, and the upcoming NEASCOUT mission are examples of this synergy of trends. The continuation of these and other related devlopments towards a propellant-less and highly efficient class of spacecraft for solar system exploration emerges in the form of small spacecraft solar sails designed for carefree handling and equipped with carried landers and application modules. These address the needs of all asteroid user communities - planetary science, planetary defence, and in-situ resource utilization - as well as other fields of solar system science and applications such as space weather warning and solar observations. Already the DLR-ESTEC GOSSAMER Roadmap for Solar Sailing initiated studies of missions uniquely feasible with solar sails such as Displaced L1 (DL1) space weather advance warning and monitoring and Solar Polar Orbiter (SPO) delivery, which demonstrate the capabilities of near-term solar sails to reach any kind of orbit in the inner solar system. This enables Multiple Near-Earth Asteroid (NEA) rendezvous missions (MNR), from Earth-coorbital to extremely inclined and even retrograde target orbits. For these mission types using separable payloads, design concepts can be derived from the separable Boom Sail Deployment Units characteristic of DLR GOS

关键词： Solar sails

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A comparison of nonsmooth, nonconvex, constrained optimization solvers for the design of time-delay compensators

arXiv

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arXiv 2018年

作者： Kungurtsev, Vyacheslav Mitchell, Tim Vyhlídal, Tomáš Department of Computer Science Faculty of Electrical Engineering Czech Technical University in Prague Max Planck Institute for Dynamics of Complex Technical Systems Magdeburg Germany Department of Instrumentation and Control Engineering Faculty of Mechanical Engineering Czech Institute of Informatics Robotics and Cybernetics Czech Technical University in Prague

We present a detailed set of performance comparisons of two state-of-the-art solvers for the application of designing time-delay compensators, an important problem in the field of robust control. Formulating such robust control mechanics as constrained optimization problems often involves objective and constraint functions that are both nonconvex and nonsmooth, both of which present significant challenges to many solvers and their end-users hoping to obtain good solutions to these problems. In our particular engineering task, the main difficulty in the optimization arises in a nonsmooth and nonconvex stability constraint, which states that the infinite spectrum of zeros of the so-called shaper should remain in the open left half-plane. To perform our evaluation, we make use β-relative minimization profiles, recently introduced visualization tools that are particularly suited for benchmarking solvers on nonsmooth, nonconvex, constrained optimization problems. Furthermore, we also introduce new visualization tools, called Global-Local Profiles, which for a given problem and a fixed computational budget, assess the tradeoffs of distributing the budget over few or many starting points, with the former getting more budget per point and latter less. Copyright © 2018, The Authors. All rights reserved.

关键词： Robust control

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Saturated Continuous Twisting Algorithm

Saturated Continuous Twisting Algorithm

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International Workshop on Variable Structure systems, VSS

作者： M. A. Golkani L. M. Fridman S. Koch M. Reichhartinger M. Horn Faculty of Electrical and Information Engineering Graz University of Technology Graz Austria Department of Control Engineering and Robotics National Autonomous University of Mexico México D.F. Mexico Christian Doppler Laboratory for Model Based Control of Complex Test Bed Systems Graz University of Technology Graz Austria

In this paper, a second-order system affected by perturbations is considered. A feedback control law adopting the continuous twisting algorithm is designed such that a saturated and continuous control signal is introduced to the system. In the case that a state variable is not measurable, estimate information obtained through a super-twisting observer is incorporated into the design. For the closed-loops (with and without observer), global finite-time stability properties are established. The feasibility and effectiveness of the strategy is shown employing numerical simulations.

关键词： Stability analysis Lyapunov methods Observers Perturbation methods Heuristic algorithms Actuators Feedback control

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Solar Sails for Planetary Defense High-Energy Missions

Solar Sails for Planetary Defense High-Energy Missions

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2019 IEEE Aerospace Conference, AERO 2019

作者： Grundmann, Jan Thimo Bauer, Waldemar Borchers, Kai Dumont, Etienne Grimm, Christian D. Ho, Tra-Mi Jahnke, Rico Koch, Aaron D. Lange, Caroline Maiwald, Volker Mess, Jan-Gerd Mikulz, Eugen Quantius, Dominik Reershemius, Siebo Renger, Thomas Sasaki, Kaname Seefeldt, Patric Spietz, Peter Sprowitz, Tom Sznajder, MacIej Tóth, Norbert Ceriotti, Matteo McInnes, Colin Peloni, Alessandro Dachwald, Bernd Lichtenheldt, Roy Wolff, Friederike Boden, Ralf Riemann, Johannes Seboldt, Wolfgang Wejmo, Elisabet Ziach, Christian Cordero, Federico Biele, Jens Krause, Christian Herčik, David Koncz, Alexander Pelivan, Ivanka Schmitz, Nicole Mikschl, Tobias Montenegro, Sergio Ruffer, Michael Tardivel, Simon DLR German Aerospace Center Institute of Space Systems Robert-Hooke-Strasse 7 Bremen28359 Germany University of Glasgow GlasgowG12 8QQ United Kingdom Faculty of Aerospace Engineering FH Aachen Univ. of Applied Sciences Hohenstaufenallee 6 Aachen52064 Germany DLR German Aerospace Center Robotics and Mechatronics Center Institute of System Dynamics and Control Münchener Str. 20 Oberpfaffenhofen Weßling82234 Germany DLR Institute of Space Systems Germany Telespazio-VEGA Darmstadt Germany DLR German Aerospace Center Space Operations and Astronaut Training - MUSC Cologne51147 Germany Institute for Geophysics and Extraterrestrial Physics Technical University Braunschweig Braunschweig Germany DLR German Aerospace Center Institute of Planetary Research Rutherfordstr. 2 Berlin12489 Germany Informatik 8 Universität Würzburg Am Hubland Würzburg97074 Germany CNES Future Missions Flight Dynamics 18 avenue E. Belin Toulouse Cedex 931401 France

ISBN: (纸本)9781538668542

20 years after the successful ground deployment test of a (20 m)2 solar sail at DLR Cologne, and in the light of the upcoming U.S. NEAscout mission, we provide an overview of the progress made since in our mission and hardware design studies as well as the hardware built in the course of our solar sail technology development. We outline the most likely and most efficient routes to develop solar sails for useful missions in science and applications, based on our developed 'now-term' and near-term hardware as well as the many practical and managerial lessons learned from the DLR-ESTEC Gossamer Roadmap. Mission types directly applicable to planetary defense include single and Multiple NEA Rendezvous ((M)NR) for precursor, monitoring and follow-up scenarios as well as sail-propelled head-on retrograde kinetic impactors (RKI) for mitigation. Other mission types such as the Displaced L1 (DL1) space weather advance warning and monitoring or Solar Polar Orbiter (SPO) types demonstrate the capability of near-term solar sails to achieve asteroid rendezvous in any kind of orbit, from Earth-coorbital to extremely inclined and even retrograde orbits. Some of these mission types such as SPO, (M)NR and RKI include separable payloads. For one-way access to the asteroid surface, nanolanders like MASCOT are an ideal match for solar sails in micro-spacecraft format, i.e. in launch configurations compatible with ESPA and ASAP secondary payload platforms. Larger landers similar to the JAXA-DLR study of a Jupiter Trojan asteroid lander for the OKEANOS mission can shuttle from the sail to the asteroids visited and enable multiple NEA sample-return missions. The high impact velocities and re-try capability achieved by the RKI mission type on a final orbit identical to the target asteroid's but retrograde to its motion enables small spacecraft size impactors to carry sufficient kinetic energy for deflection. © 2019 IEEE.

关键词： Solar sails

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Study of surface processes of functionalized composite structures por-Si/Ag by the method of edge wet angle

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Journal of Physics: Conference Series 2020年第1期1658卷

作者： V L Koshevoi A V Timchenko I M Pleshanov R S Denisenko S S Bazylo A O Belorus Department of General and Technical Physics Saint Petersburg Mining University 2 21st Line Saint Petersburg Russia Institute of Environmental Management Urban Development and Spatial Planning Immanuel Kant Baltic Federal University 14 A. Nevskogo st. Kaliningrad Russia Faculty of photonics and optical information Saint Petersburg National Research University of Information Technologies Mechanics and Optics (ITMO) Kronversky pr. 49 Saint Petersburg Russia Faculty of Control Systems and Robotics Saint Petersburg National Research University of Information Technologies Mechanics and Optics (ITMO) Kronversky pr. 49 Saint Petersburg Russia Odintsovo branch of the Federal State Autonomous Educational Institution of Higher Education 'Moscow State Institute of International Relations (University) of the Ministry of Foreign Affairs of the Russian Federation st. Novo-Sportivnaya 3 Odintsovo Russia Department of Micro- and Nanoelectronics Saint Petersburg Electrotechnical University 'LETI' st. Professora Popova 5 Saint Petersburg Russia

In this work, we studied the functionalized por-Si/Ag composite structures by the contact angle method using the 'Contact Angle Measurement System JGW-360A'. The hydrophobic / hydrophilic properties of the studied structures were analyzed. Were studied changes in surface functional groups with various functionalization methods. Wetting gulls were also determined for different series of samples: porous silicon (θ ≈ 580), a porous matrix with a silver layer (θ ≈ 340), and a porous matrix functionalized by electro-thermal diffusion (θ ≈ 410). Were drawn the conclusions about the effect of oxide phases on the hydrophobic/hydrophilic properties of the studied samples.

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Robust suboptimal output stabilization for multi input multi output plants under disturbances

Robust suboptimal output stabilization for multi input multi...

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International Conference on Ultra Modern Telecommunications and Workshops (ICUMT)

作者： Sergey A. Vrazevsky Julia V. Chugina Igor B. Furtat Artem S. Kremlev Department of Control Systems and Industrial Robotics ITMO University St. Petersburg Russia IPME RAS The Laboratory “Control of Complex Systems” St. Petersburg Russia

Present work provides the robust suboptimal control algorithm for an output stabilization of a linear multi-input multioutput (MIMO) plant with uncertainties. The algorithm combines robust control provided by auxiliary loop method for disturbances compensation and optimal control in the form of the linear quadratic regulator. In current research, plant is presented in form of linear interval model. This reflects plant parametric uncertainty and possibility to use the proposed method to control a nonlinear plant amenable to the interval linearization. The latter is used in the experimental illustration of the algorithm performance on the Twin Rotor MIMO System laboratory platform.

关键词： Telecommunications control systems Conferences

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Introduction

Advances in Industrial Control

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Advances in Industrial control 2018年第9783319610207期 1-18页

作者： Orsag, Matko Korpela, Christopher Oh, Paul Bogdan, Stjepan Laboratory for Robotics and Intelligent Control Systems Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Department of Electrical Engineering and Computer Science United States Military Academy West PointNY United States Department of Mechanical Engineering University of Nevada Las Vegas Las VegasNV United States

Aerial robotics has reached significant maturity in the last few years. Thus, the number of new unmanned aerial vehicles (UAV) and unmanned aerial systems (UAS), applications, and companies producing them has increased in a very important way. The number of publications and presentations in conferences has also experienced a large increase. Moreover, almost every day we can find articles, videos, and news in the general media related to drones. © Springer International Publishing AG 2018.

关键词： Antennas

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Robust control algorithm under mismatched disturbances

Robust control algorithm under mismatched disturbances

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International Conference on Ultra Modern Telecommunications and Workshops (ICUMT)

作者： Igor B. Furtat Sergey A. Vrazevsky Artem S. Kremlev Pavel A. Gushchin Department of Control Systems and Industrial Robotics ITMO University St. Petersburg Russia The Laboratory “Control of Complex Systems” IPME RAS St. Petersburg Russia Department of Physical Chemistry Gubkin University Moscow Russia

The paper deals with the algorithm for mismatched disturbance compensation. A linear plant with time-delays in state vector is considered. control approach uses both backstepping algorithm and auxiliary loop technique that leads to disturbance identification and its compensation. Stability of the plant with required accuracy is demonstrated.

关键词： Telecommunications control systems Conferences

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Power Line Communication Technologies in Automated control systems

Power Line Communication Technologies in Automated Control S...

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IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering

作者： Anton A. Zhilenkov Dinis D. Gilyazov Ilya I. Matveev Yanina V. Krishtal Faculty of Control Systems and Robotics Department of Control Systems and Informatics Saint Petersburg National Research University of Information Technologies Mechanics and Optics Saint Petersburg Russia

ISBN: (纸本)9781509048663

PLC- is a new telecommunication technology, which based on using power electrical lines for high-speed information exchange. Experiments on data transmission by electrical networks were led a long time ago, but the low speed of data transference and a low noise immunity were a weak point of this technology. However, progress does not stand still, and the emergence of more powerful processors made it possible to use more complicated methods of signal modulation, such as Orthogonal Frequency Division Multiplexing. This allowed to significantly move forward in the implementation of PLC technology. Nowadays PLC can find a wide use in home communications, security systems, automation of technological processes, etc. Nevertheless, in Russia, PLC-technology may face a number of difficulties.

关键词： Electrical network Data transferring Frequency division multiplexing Automated control system

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Sensorless nonlinear control of fed-batch Escherichia coli cultivation bioprocess using the state-dependent approach 12th

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12th Portuguese Conference on Automatic control, controlO 2016

作者： Iratni, Abdelhamid Araújo, Rui Rastegar, Saeid Mostefai, Mohammed Faculty of Science and Technology Electrical Engineering Department University of Bordj Bou Arreridj El Anasser Algeria Department of Electrical and Computer Engineering Institute for Systems and Robotics University of Coimbra Coimbra Portugal Automatic Control Laboratory of Setif Electrical Engineering Department Faculty of Technology University of Setif1 Sétif Algeria

ISBN: (纸本)9783319436708

The cultivation of Escherichia coli bacteria is widely used by geneticists and biopharmaceuticals to produce medicines and vaccines. In such industries, Bioprocesses are known by their harsh environment and very expensive physical sensors. This paper deals with nonlinear estimation and control of fed-batch Escherichia coli bioprocess. Enhancing the process performance and maximizing its efficiency by optimizing the control of Escherichia coli cultures depends on the availability of appropriate online sensors for the main culture components. In this study, an innovative method for nonlinear estimation and control of bioprocesses is designed and assessed. The new algorithm for control and estimation of Escherichia coli bioprocess states, based on the State-Dependent Riccati Equation technique, is validated by numerical simulation. The results obtained clearly demonstrate the effectiveness of the proposed technique for Biosystems in measuring, monitoring, and control of their natural nonlinear dynamics. © Springer International Publishing Switzerland 2017.

关键词： Extended Kalman filters

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