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  • 51.
    Sinn, Thomas
    et al.
    University of Strathclyde.
    McRobb, Malcolm
    University of Glasgow.
    Wujek, Adam
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Skogby, Jerker
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Zhang, Mengqi
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Vasile, Massimiliano
    University of Strathclyde.
    Tibert, Gunnar
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Weppler, Johannes
    University of Stuttgart.
    Feeney, Andrew
    University of Glasgow.
    Russell, John
    University of Glasgow.
    Rogberg, Fredrik
    KTH, School of Electrical Engineering (EES).
    Wang, Junyi
    KTH, School of Electrical Engineering (EES).
    REXUS 12 Suaineadh experiment: deployment of a web in microgravity conditions using centrifugal forces2011In: IAC 2011: Proceedings of the 62nd International Astronautical Congress, 2011, p. IAC-11-A2.3.7-Conference paper (Refereed)
  • 52.
    Summerer, Leopold
    et al.
    ESA Advanced Concepts Team.
    Purcell, Oisin
    ESA Advanced Concepts Team.
    Vasile, Massimiliano
    University of Glasgow.
    Tibert, Gunnar
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Kaya, Nobuyuki
    Kobe University.
    Making the first steps towards solar power from space - microgravity experiments testing the deployment of large antennas2009In: IAC 2009: Proceedings of the 60th International Astronautical Congress, 2009, p. IAC-09.C3.4.4-Conference paper (Refereed)
    Abstract [en]

    Concepts for solar power from space have received renewed attention over the past year. High costs for fossil fuel during most of 2007 and 2008 have contributed to increasing the interest not only in traditional renewable energy sources but also in options usually considered as rather "exotic". Solar power from space is one of these. Given the potential size of such an endeavour, it is particularly important to demonstrate its feasibility and convince energy sector representatives and critics via concrete demonstrator projects targeting key technologies. The construction of a light-weight, very large structure as needed for transmitting antennas and the demonstration of wireless power transmission over very large distances are two of these key technologies. The present paper presents two experiments Furoshiki-2 and Suaineadh addressing these key technologies.

  • 53.
    Tibert, Gunnar
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Bending-stiff tensegrity masts: do they exist?2008In: Proceedings of the 6th International Conference of Shell and Spatial Structures, 2008Conference paper (Refereed)
  • 54.
    Tibert, Gunnar
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Computational challenges for highly flexible space structures2008In: Proceedings of the 21st Nordic Seminar on Computational Mechanics, 2008, p. 43-46Conference paper (Other academic)
  • 55.
    Tibert, Gunnar
    KTH, Superseded Departments, Mechanics.
    Deployable Tensegrity Structures for Space Applications2002Doctoral thesis, monograph (Other scientific)
  • 56.
    Tibert, Gunnar
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Design and form-finding analysis of tensegrity power lines2011In: Proceeding of the 4th Structural Engineering World Congress, 2011Conference paper (Other academic)
  • 57.
    Tibert, Gunnar
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Distributed indeterminacy in frameworks2005In: Proceedings of the 5th International Conference on Computation of Shell and Spatial Structures, 2005Conference paper (Refereed)
  • 58.
    Tibert, Gunnar
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Flexibility evaluation of prestressed kinematically indeterminate frameworks2005In: NSCM-18: Proceedings of the 18th Nordic Seminar on Computational Mechanics, 2005Conference paper (Refereed)
  • 59.
    Tibert, Gunnar
    KTH, Superseded Departments, Structural Engineering.
    Numerical analyses of cable roof structures1999Licentiate thesis, monograph (Other scientific)
  • 60.
    Tibert, Gunnar
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Optimal design of tension truss antennas2003In: Proceedings of the 44th AIAA/ASME/ASCE/AHS Structures, Structural Dynamics, and Materials Conference, American Institute of Aeronautics and Astronautics, 2003, p. AIAA-2003-1629-Conference paper (Refereed)
  • 61.
    Tibert, Gunnar
    KTH, Superseded Departments, Mechanics.
    Optimisation of prestressed triangular frameworks2004In: NSCM-17: Proceedings of the 17th Nordic Seminar on Computational Mechanics, KTH Royal Institute of Technology, 2004Conference paper (Refereed)
  • 62.
    Tibert, Gunnar
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Hedlund, Erik
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Surface accuracy analysis of torus-supported inflatable reflector antennas2007In: Proceedings of Structural Membranes 2007, Barcelona, Spain: CIMNE , 2007, p. 133-136Conference paper (Refereed)
  • 63.
    Tibert, Gunnar
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Krantz, Magnus
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Teaching principal stresses by truss analogies2006In: Proceedings of the 19th Nordic Seminar on Computational Mechanics, 2006, p. 147-150Conference paper (Refereed)
  • 64.
    Tibert, Gunnar
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Lennon, Andrew
    Lessons from structural design of a highly-flexible space structure: the space-tow solar sail2007In: Proceedings of the First CEAS European Air and Space Conference, 2007, p. CEAS-2007-251-Conference paper (Refereed)
  • 65.
    Tibert, Gunnar
    et al.
    KTH, Superseded Departments, Structural Engineering.
    Pellegrino, S.
    Deployable tensegrity reflectors for small satellites2002In: Journal of Spacecraft and Rockets, ISSN 0022-4650, E-ISSN 1533-6794, Vol. 39, no 5, p. 701-709Article in journal (Refereed)
    Abstract [en]

    Future small satellite missions require low-cost, precision reflector structures with large aperture that can be packaged in a small envelope. Existing furlable reflectors form a compact package which, although narrow, is too tall for many applications. An alternative approach is proposed, consisting of a deployable tensegrity prism forming a ring structure that deploys two identical cable nets (front and rear nets) interconnected by tension ties; the reflecting mesh is attached to the front net. The geometric configuration of the structure has been optimized to reduce the compression in the struts of the tensegrity prism. A small-scale physical model has been constructed to demonstrate the proposed concept. A preliminary design of a 3-m-diam, 10-GHz reflector with a focal-length-to-diameter ratio of 0.4 that can be packaged within an envelope of 0.1 x 0.2 x 0.8 m(3) is presented.

  • 66.
    Tibert, Gunnar
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Pellegrino, Sergio
    University of Cambridge.
    Deployable tensegrity masts2003In: Proceedings of the 44th AIAA/ASME/ASCE/AHS Structures, Structural Dynamics, and Materials Conference, American Institute of Aeronautics and Astronautics, 2003, p. AIAA-2003-1978-Conference paper (Refereed)
  • 67.
    Tibert, Gunnar
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Pellegrino, Sergio
    University of Cambridge.
    Form-finding of tensegrity structures - a review2001In: NSCM-14: Proceedings of the 14th Nordic Seminar on Computational Mechanics, 2001, p. 133-136Conference paper (Refereed)
  • 68.
    Tibert, Gunnar
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Pellegrino, Sergio
    University of Cambridge.
    Furlable reflector concept for small satellites2001In: Proceedings of the 42nd AIAA/ASME/ASCE/AHS Structures, Structural Mechanics, and Materials Conference, American Institute of Aeronautics and Astronautics, 2001, p. AIAA-2001-1261-Conference paper (Refereed)
  • 69.
    Tibert, Gunnar
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Pellegrino, Sergio
    Review of form-finding methods for tensegrity structures2011In: International Journal of Space Structures, ISSN 0266-3511, Vol. 26, no 3, p. 241-255Article in journal (Refereed)
    Abstract [en]

    Seven form-finding methods for tensegrity structures are reviewed and classified. The three kinematical methods include an analytical approach, a non-linear optimisation, and a pseudo-dynamic iteration. The four statical methods include an analytical method, the formulation of linear equations of equilibrium in terms of force densities, an energy minimisation, and a search for the equilibrium configurations of the struts of the structure connected by cables whose lengths are to be determined, using a reduced set of equilibrium equations. It is concluded that the kinematical methods are best suited to obtaining only configuration details of structures that are already essentially known. The force density method is best suited to searching for new configurations, but affords no control over the lengths of the elements of the structure. The reduced coordinates method offers a greater control on elements lengths, but requires more extensive symbolic manipulations.

  • 70.
    Tibert, Gunnar
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Pellegrino, Sergio
    University of Cambridge.
    Review of form-finding methods for tensegrity structures2003In: International Journal of Space Structures, ISSN 0266-3511, Vol. 18, no 4, p. 209-223Article in journal (Refereed)
  • 71.
    Vasile, Massimiliano
    et al.
    Univ. of Strathclyde.
    Cartmell, Matthew
    Univ. of Glasgow.
    Zerihun Dejene, Firew
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Drysdale, T.
    Alaniz Flores, Monica
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Gulzar, Muhammad
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Ismail, N.
    Khalid, Muhammad Usman
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Li, M.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Maddock, C.
    Mallol, Pau
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Mathieson, A.
    McRobb, M.
    Öberg, Johnny
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Purcell, O.
    Reynolds, P.
    Ritterbusch, Rafael
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Sandqvist, William
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Summerer, L.
    Tanveer, Muhammad Usman
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Tibert, Gunnar
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Whyte, G.
    Zafar, W.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    Zhang, J.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems.
    The Suaineadh Project: a Stepping Stone Towards the Deployment of Large Flexible Structures in Space2010In: Proceedings of the 61st International Astronautical Congress, the International Astronautical Federation , 2010, p. IAC-10-C3.4-Conference paper (Refereed)
    Abstract [en]

    The Suaineadh project aims at testing the controlled deployment and stabilization of space web. The deployment system is based on a simple yet ingenious control of the centrifugal force that will pull each of the four daughters sections apart. The four daughters are attached onto the four corners of a square web, and will be released from their initial stowed configuration attached to a central hub. Enclosed in the central hub is a specifically designed spinning reaction wheel that controls the rotational speed with a closed loop control fed by measurements from an onboard inertial measurement sensor. Five other such sensors located within the web and central hub provide information on the surface curvature of the web, and progression of the deployment. Suaineadh is currently at an advanced stage of development: all the components are manufactured with the subsystems integrated and are presently awaiting full integration and testing. This paper will present the current status of the Suaineadh project and the results of the most recent set of tests. In particular, the paper will cover the overall mechanical design of the system, the electrical and sensor assemblies, the communication and power systems and the spinning wheel with its control system.

  • 72.
    Yuan, Yunxia
    et al.
    KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
    Ivchenko, Nickolay
    KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
    Tibert, Gunnar
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Schlatter, Nicola
    KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
    RECONSTRUCTION OF ATTITUDE DYNAMICS OF FREE FALLING UNITS2015In: EUROPEAN ROCKET AND BALLOON: PROGRAMMES AND RELATED RESEARCH, 2015, p. 107-113Conference paper (Refereed)
    Abstract [en]

    Attitude reconstruction of a free falling sphere for the experiment Multiple Spheres for Characterization of Atmosphere Temperatures (MUSCAT) is studied in this paper. The attitude dynamics is modeled through Euler's rotational equations of motion. To estimate uncertain parameters in this model such as the matrix of inertia and the lever arm for the dynamic pressure with respect to the center of mass, the dynamics reconstruction can be formulated as an optimization problem. The goal is to minimize the deviation between the measurements and the propagation from the system equations. This approach was tested against a couple of flight data sets which correspond to different periods of time. The result is very reasonable compared to the laboratory test. The estimate can be improved further through allowing drag coefficients variable and taking advantage of measurements from a magnetometer in numerical calculation.

  • 73. Zolesi, V. S.
    et al.
    Ganga, P. L.
    Scolamiero, L.
    Micheletti, A.
    Podio-Guidugli, P.
    Tibert, Gunnar
    KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
    Donati, A.
    Ghiozzi, M.
    On an innovative deployment concept for large space structures2012In: 42nd International Conference on Environmental Systems 2012, ICES 2012, American Institute of Aeronautics and Astronautics, 2012Conference paper (Refereed)
    Abstract [en]

    Large deployable space structures are mission-critical technologies for which deployment failure cannot be an option. The difficulty to fully reproduce and test on ground the deployment of large systems dictates the need for extremely reliable architectural concepts. In 2010, ESA promoted a study focused at the pre-development of breakthrough architectural concepts offering superior reliability. The study, which was performed as an initiative of ESA Small Medium Enterprises Office (http://www.esa.int/SME/), by Kayser Italia at its premises in Livorno (Italy), with Universita' di Roma TorVergata (Rome, Italy) as sub-contractor and consultancy from KTH (Stockholm, Sweden), led to the identification of an innovative large deployable structure of "tensegrity" type, which achieves the required reliability because it permits a drastic reduction in the number of articulated joints in comparison with non-tensegrity architectures. The identified target application was in the field of large antenna reflectors. The project focused on the overall architecture of a deployable system and the related design implications. With a view toward verifying experimentally the performance of the deployable structure, a reduced-scale breadboard model was designed and manufactured. A gravity off-loading system was designed and implemented, so as to check deployment functionality in a 1-g environment. Finally, a test campaign was conducted, to validate the main design assumptions as well as to ensure the concept's suitability for the selected target application. The test activities demonstrated satisfactory stiffness, deployment repeatability, and geometric precision in the fully deployed configuration. The test data were also used to validate a finite element model, which predicts a good static and dynamic behavior of the full-scale deployable structure.

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