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arXiv 2018年

作者： Wada, Koji Grott, Matthias Michel, Patrick Walsh, Kevin J. Barucci, Antonella M. Biele, Jens Blum, Jürgen Ernst, Carolyn M. Grundmann, Jan T. Gundlach, Bastian Hagermann, Axel Hamm, Maximilian Jutzi, Martin Kim, Myung-Jin Kührt, Ekkehard Le Corre, Lucille Libourel, Guy Lichtenheldt, Roy Maturilli, Alessandro Messenger, Scott R. Michikami, Tatsuhiro Miyamoto, Hideaki Mottola, Stefano Nakamura, Akiko M. Müller, Thomas Nittler, Larry R. Ogawa, Kazunori Okada, Tatsuaki Palomba, Ernesto Sakatani, Naoya Schröder, Stefan Takir, Driss Zolensky, Michael E. Tsudanuma 2-17-1 Narashino Chiba275-0016 Japan DLR Institute for Planetary Research Rutherfordstr. 2 Berlin12489 Germany Université Côte d'Azur Observatoire de la Côte d'Azur CNRS Lagrange Laboratory Southwest Research Institute Boulder United States Observatoire de Paris PSL Research University CNRS Université Paris Diderot Sorbonne Paris Cité UPMC Université Paris 06 Sorbonne Universités 5 Place J. Janssen Meudon Principal Cedex92195 France DLR RB-MSC German Aerospace Center Cologne51147 Germany Institut für Geophysik und extraterrestrische Physik Technische Universität Braunschweig Mendelssohnstr. 3 BraunschweigD-38106 Germany Johns Hopkins University Applied Physics Laboratory LaurelMD United States DLR German Aerospace Center Institute of Space Systems System Engineering and Project Office Robert-Hooke-Strasse 7 BremenD-28359 Germany Department of Biological and Environmental Sciences University of Stirling FK9 4LA United Kingdom Physics Institute University of Bern Switzerland Center for Space Situational Awareness Korea Astronomy and Space Science Institute 776 Daedeokdae-ro Yuseong-gu Daejeon305-348 Korea Republic of Planetary Science Institute 1700 East Fort Lowell Suite 106 TucsonAZ85719 United States DLR Institute of System Dynamics and Control Oberpfaffenhoffen Germany Robert M Walker for Space Sciences Astromaterials Research and Exploration Science NASA Johnson Space Center HoustonTX77058 United States Faculty of Engineering Kindai University Hiroshima Campus 1 Takaya Umenobe Higashi-Hiroshima Hiroshima739-2116 Japan Deptartment of Systems Innovation University of Tokyo Tokyo Japan Department of Planetology Graduate School of Science Kobe University 1-1 Rokkodai Nada-ku Kobe657-8501 Japan Max-Planck Institute for Extraterrestrial Physics Garching Germany Department of Terrestrial Magnetism Carnegie Institution of Washington 5241 Broad Branch Rd NW 20015 United States Institute of Space and Astronautical Sc

Asteroid (162173) Ryugu is the target object of Hayabusa2, an asteroid exploration and sample return mission led by Japan Aerospace Exploration Agency (JAXA). Ground-based observations indicate that Ryugu is a C-type near-Earth asteroid with a diameter of less than 1 km, but the knowledge of its detailed properties is still very limited. This paper summarizes our best understanding of the physical and dynamical properties of Ryugu based on remote sensing and theoretical modeling. This information is used to construct a design reference model of the asteroid that is used for formulation of mission operations plans in advance of asteroid arrival. Particular attention is given to the surface properties of Ryugu that are relevant to sample acquisition. This reference model helps readers to appropriately interpret the data that will be directly obtained by Hayabusa2 and promotes scientific studies not only for Ryugu itself and other small bodies but also for the Solar system evolution that small bodies shed light on. Copyright © 2018, The Authors. All rights reserved.

关键词： Asteroids

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Enhancing BEM simulations of a stalled wind turbine using a 3D correction model

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Journal of Physics: Conference Series 2018年第1期974卷

作者： Galih Bangga Go Hutomo Taurista Syawitri Tri Kusumadewi Winda Oktavia Ahmad Sabila Herlambang Setiadi Muhamad Faisal Yongki Hendranata Dwi Lastomo Louis Putra Stefanus Kristiadi Ilmi Bumi Institute of Aerodynamics and Gas Dynamics University of Stuttgart Stuttgart Germany Mechanical Engineering Department Institut Teknologi Sepuluh Nopember Surabaya Indonesia Toyota SO Department Astra International Ltd. Indonesia Mechanical Engineering Department Universitas Muhammadiyah Surakarta Surakarta Indonesia School of Manufacturing System and Mechanical Engineering Sirindhorn International Institute of Technology Thammasat University Thailand Project Support and Cost Control Division Indoturbine Ltd. Jakarta Indonesia Civil Engineering Department Universitas Brawijaya Malang Indonesia School of Information Technology & Electrical Engineering The University of Queensland Brisbane Australia Non-Installation Top Range Department Berca Schindler Lifts Ltd. Indonesia Graduate Institute of Automation and Control National Taiwan University of Science and Technology Taiwan Mechanical Engineering Department Texas A&M University College Station United States PUI-PT Mechatronics and Industrial Automation Research Center Intitut Teknologi Sepuluh Nopember Surabaya Indonesia Mechanical Engineering Department Politecnico di Milano Milan Italy Aeronautics Department Imperial College of Science Technology and Medicine London United Kingdom Materials Engineering Department Institut Teknologi Sepuluh Nopember Surabaya Indonesia

Nowadays wind turbine rotors are usually employed with pitch control mechanisms to avoid deep stall conditions. Despite that, wind turbines often operate under pitch fault situation causing massive flow separation to occur. Pure Blade Element Momentum (BEM) approaches are not designed for this situation and inaccurate load predictions are already expected. In the present studies, BEM predictions are improved through the inclusion of a stall delay model for a wind turbine rotor operating under pitch fault situation of -2.3° towards stall. The accuracy of the stall delay model is assessed by comparing the results with available Computational Fluid dynamics (CFD) simulations data.

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Aircraft upset and recovery simulation with the DLR robot motion simulator

Aircraft upset and recovery simulation with the DLR robot mo...

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AIAA Modeling and Simulation Technologies Conference 2015

作者： Nie, Yuanbo Bellmann, Tobias Labusch, Andreas Looye, Gertjan van Kampen, Erik-Jan Chu, Ping DLR German Aerospace Center Wessling82234 Germany Delft University of Technology Kluyverweg 1 Delft2629HS Netherlands Institute of System Dynamics and Control-Flight System Dynamics Germany Faculty of Aerospace Engineering-Control and Simulation Netherlands

ISBN: (纸本)9781624103438

Aiming at providing a more accessible alternative platform for upset recovery training and research, the feasibility of adapting the German Aerospace Center (DLR)’s Robot Motion Simulator is studied with use of the Fokker 100 extended flight dynamics model developed earlier. Adjustments are made to the S-function in the simulation software setup for better preserving the dynamic motions in stall and post-stall conditions. The configuration of the simulator with a cabin located on the top of a KUKA industrial robot arm provides seven axis of movement freedom, greatly enlarging the motion capability in comparison to the conventional hexapod simulators. Virtually all nominal flight conditions can be simulated well with the current setup;and with a slight modification of one axis for continuous rotations, the simulator shows good capability of reproducing the motions experienced in aircraft upset conditions and recovery maneuvers. © 2015, American institute of Aeronautics and Astronautics Inc. All rights reserved.

关键词： Recovery

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Improving a two-equation eddy-viscosity turbulence model to predict the aerodynamic performance of thick wind turbine airfoils

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Journal of Physics: Conference Series 2018年第1期974卷

作者： Galih Bangga Tri Kusumadewi Go Hutomo Ahmad Sabila Taurista Syawitri Herlambang Setiadi Muhamad Faisal Raditya Wiranegara Yongki Hendranata Dwi Lastomo Louis Putra Stefanus Kristiadi Institute of Aerodynamics and Gas Dynamics University of Stuttgart Stuttgart Germany Mechanical Engineering Department Institut Teknologi Sepuluh Nopember Surabaya Indonesia School of Manufacturing System and Mechanical Engineering Sirindhorn International Institute of Technology Thammasat University Thailand Toyota SO Department Astra International Ltd. Indonesia Civil Engineering Department Universitas Brawijaya Malang Indonesia Mechanical Engineering Department Universitas Muhammadiyah Surakarta Surakarta Indonesia School of Information Technology & Electrical Engineering The University of Queensland Brisbane Australia Non-Installation Top Range Department Berca Schindler Lifts Ltd. Indonesia Graduate Institute of Automation and Control National Taiwan University of Science and Technology Taiwan School of Aerospace Transport and Manufacturing Cranfield University United Kingdom Mechanical Engineering Department Texas A&M University College Station United States PUI-PT Mechatronics and Industrial Automation Research Center Intitut Teknologi Sepuluh Nopember Surabaya Indonesia Mechanical Engineering Department Politecnico di Milano Milan Italy Aeronautics Department Imperial College of Science Technology and Medicine London United Kingdom

Numerical simulations for relatively thick airfoils are carried out in the present studies. An attempt to improve the accuracy of the numerical predictions is done by adjusting the turbulent viscosity of the eddy-viscosity Menter Shear-Stress-Transport (SST) model. The modification involves the addition of a damping factor on the wall-bounded flows incorporating the ratio of the turbulent kinetic energy to its specific dissipation rate for separation detection. The results are compared with available experimental data and CFD simulations using the original Menter SST model. The present model improves the lift polar prediction even though the stall angle is still overestimated. The improvement is caused by the better prediction of separated flow under a strong adverse pressure gradient. The results show that the Reynolds stresses are damped near the wall causing variation of the logarithmic velocity profiles.

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On the analytic solvability of a special boundary value problem for the nonlinear heat equation

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AIP Conference Proceedings 2017年第1期1915卷

作者： A. L. Kazakov A. A. Lempert P. A. Kuznetsov 1Institute of Engineering Science Ural Branch of the Russian Academy of Sciences 34 Komsomolskaya St. Ekaterinburg 620049 Russia 2Matrosov Institute for System Dynamics and Control Theory Siberian Branch of the Russian Academy of Sciences 134 Lermontova St. 664033 Irkutsk Russia

In the article we develop an approach to the study of nonlinear problems of mathematical physics, proposed in A. F. Sidorov’s school of thought, and apply it to solving boundary value problems with degeneracy for the nonlinear heat (porous medium) equation. The essence of the approach is that the solution of problems is constructed in the form of multiple power series. The convergence of the constructed series is proved by the majorant method. It allows us to propose the existence and uniqueness theorem, which is analogous to the Cauchy-Kovalevskaya theorem for the considered problem. A constructive scheme for finding the coefficients of the series is proposed. A special feature of the study is that the boundary condition is given on a moving closed manifold.

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Solving a degenerate nonlinear parabolic equation with a specified source function by the boundary element method

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AIP Conference Proceedings 2017年第1期1915卷

作者： L. F. Spevak A. L. Kazakov 1Institute of Engineering Science Ural Branch of the Russian Academy of Sciences 34 Komsomolskaya str. 620049 Ekaterinburg Russia 2Matrosov Institute for System Dynamics and Control Theory Siberian Branch of the Russian Academy of Sciences 134 Lermontov str. 664033 Irkutsk Russia

A degenerate nonlinear parabolic-type equation with a specified source function is solved. Boundary value problems for various kinds of boundary conditions are considered. Solution algorithms based on the boundary element method are constructed. Some examples are discussed. The comparison of the obtained BEM solutions with known exact solutions gives good results.

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Precise carrier phase time transfer based on BDS regional navigation system 66

Precise carrier phase time transfer based on BDS regional na...

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66th International Astronautical Congress 2015: Space - The Gateway for Mankind's Future, IAC 2015

作者： Hongzheng, Cui Liu, Wenling Geshi, Tang Baiyan, Song Huicui, Liu Science and Technology on Aerospace Flight Dynamics Laboratory Beijing Aerospace Control Center China Beijing Institute of Electronic System Engineering Beijing10085 China

ISBN: (纸本)9781510818934

The GNSSCPTT (GNSS Carrier Phase Time Transfer) can provide 0.1∼0.2 ns accuracy and a frequency stability of le-15∼2e-15 for averaging times of half-day, which is equivalent to the two-way satellite time/frequency transfer (TWSTFT). The BDS constellation composed of 14 GEO satellites has deployed by 2012 and begins to provide positioning services for Asia-Pacific region. In order to provide services of GNSS performance monitoring, promote service assurance, improve service performance, ensure the interoperability of OS signals for four systems, GPS/GLONASS/GALILEO/BDS, the iGMAS (international GNSS Monitoring and Assessment Service) is established. BACC is doing the work about operation and maintenance the iGMAS Analysis Center (BAC), and producing the precision products to the users with equivalent accuracy to well-known institutes, such as IGS and CODE, including precise satellite orbit and clock, tracking station coordinate and receiver clock, Zenith Total Delay (ZTD), Earth Orientation Parameter (EOP) parameters, global statistical integrity and Ionospheric map. This paper first describes a prototype of GNSSCPTT involved geodetic Multi-GNSS receiver, choke antenna, reference atomic clock, and other assistant equipment. On the basis of above prototype, we carry out the zero baseline experiment to calibrate the external delay including antenna delay (AE), low noise amplifier delay (LNA), and power splitter delay (PS), and receiver internal delay (RE) using two geodetic Multi-GNSS receivers with the same choke antenna and reference atomic clock. The short and long baseline experiments are also established to validate the short and long distance BDS time transfer accuracy with several long baselines from a network of BDS-capable receivers from the IGS Multi-GNSS Experiment (MGEX) and a regional BDS station network operated by China. Then, in order to analyse the characteristic of BDS carrier phase based time transfer, the observation data from zero and long baseline

关键词： Global positioning system

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Constructing numerical solutions to a nonlinear heat conduction equation with boundary conditions degenerating at the initial moment of time

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AIP Conference Proceedings 2016年第1期1785卷

作者： L. F. Spevak A. L. Kazakov 1Institute of Engineering Science UB RAS Ekaterinburg Russia 2Institute for System Dynamics and Control Theory SB RAS Irkutsk Russia

This paper deals with one-dimensional boundary value problems for a non-linear heat conduction equation with a power dependence of the heat conductivity coefficient on temperature. New solution algorithms are constructed for the instances of boundary conditions degenerating at the initial time moment. A comparison of the obtained solutions with known exact solutions shows the effectiveness of the proposed algorithms.

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Experimental Study of Gradient-Based Visual Coverage control on SO(3) Toward Moving Object/Human Monitoring

Experimental Study of Gradient-Based Visual Coverage Control...

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American control Conference

作者： Marc Forstenhaeusler Riku Funada Takeshi Hatanaka Masayuki Fujita Institute for System Dynamics University of Stuttgart Pfaffenwaldring 9 70550 Stuttgart Germany Department of Mechanical and Control Engineering Tokyo Institute of Technology Tokyo 152-8552 JAPAN

ISBN: (纸本)9781479917730

This paper presents experimental studies of coverage control for networked camera sensors. Regarding the issue, one of our previous works considered the scenario where the camera sensors with controllable orientations are distributed over the 3-D space to monitor 2-D environment. Then, we presented a visual coverage control scheme based on the gradient descent techniques on SO(3) in combination with an estimation process of the image density function describing the importance of each point over the image. In this paper, we build a testbed with four Pan-Tilt (PT) cameras and demonstrate the total process including the image acquisition, density estimation, gradient computation and camera physical motion. In particular, we show applicability of the presented scheme to a scenario of the human behavior monitoring. In addition, the density function is given in the form of a polynomial function in order to overcome the drawback of the above density estimation process that the magnitude of the motion at each pixel cannot be directly reflected to the resulting density. It is shown through experiments that the new density estimation method together with the new gradient outperforms the conventional method when the environment is rapidly changing.

关键词： Cameras Density functions Human behavior Coverage three-dimentional space Visualization

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26th Annual Computational Neuroscience Meeting (CNS*2017): Part 3 Antwerp, Belgium. 15-20 July 2017 Abstracts

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BMC NEUROSCIENCE 2017年第SUPPL 1期18卷 95-176页

作者： [Anonymous] Department of Neuroscience Yale University New Haven CT 06520 USA Department Physiology & Pharmacology SUNY Downstate Brooklyn NY 11203 USA NYU School of Engineering 6 MetroTech Center Brooklyn NY 11201 USA Departament de Matemàtica Aplicada Universitat Politècnica de Catalunya Barcelona 08028 Spain Institut de Neurobiologie de la Méditerrannée (INMED) INSERM UMR901 Aix-Marseille Univ Marseille France Center of Neural Science New York University New York NY USA Aix-Marseille Univ INSERM INS Inst Neurosci Syst Marseille France Laboratoire de Physique Théorique et Modélisation CNRS UMR 8089 Université de Cergy-Pontoise 95300 Cergy-Pontoise Cedex France Department of Mathematics and Computer Science ENSAT Abdelmalek Essaadi’s University Tangier Morocco Laboratory of Natural Computation Department of Information and Electrical Engineering and Applied Mathematics University of Salerno 84084 Fisciano SA Italy Department of Medicine University of Salerno 84083 Lancusi SA Italy Dipartimento di Fisica Università degli Studi Aldo Moro Bari and INFN Sezione Di Bari Italy Data Analysis Department Ghent University Ghent Belgium Coma Science Group University of Liège Liège Belgium Cruces Hospital and Ikerbasque Research Center Bilbao Spain BIOtech Department of Industrial Engineering University of Trento and IRCS-PAT FBK 38010 Trento Italy Department of Data Analysis Ghent University Ghent 9000 Belgium The Wellcome Trust Centre for Neuroimaging University College London London WC1N 3BG UK Department of Electronic Engineering NED University of Engineering and Technology Karachi Pakistan Blue Brain Project École Polytechnique Fédérale de Lausanne Lausanne Switzerland Departement of Mathematics Swansea University Swansea Wales UK Laboratory for Topology and Neuroscience at the Brain Mind Institute École polytechnique fédérale de Lausanne Lausanne Switzerland Institute of Mathematics University of Aberdeen Aberdeen Scotland UK Department of Integrativ

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