Operational modal analysis via image based technique of very flexible space structures |
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| Institution: | 1. DIAEE, University of Rome “La Sapienza”, Italy;2. DIMA, University of Rome “La Sapienza”, Italy;1. DIMA – Dipartimento di Ingegneria Meccanica ed Aerospaziale, University of Rome “La Sapienza”, via Eudossiana 18, 00184 Roma, Italy;2. DIAEE – Dipartimento di Ingegneria Astronautica Elettrica ed Energetica, University of Rome “La Sapienza”, via Salaria 851, 00138 Roma, Italy;1. Thales Alenia Space Italia S.p.A., Rome, Italy;2. University of Rome La Sapienza, Italy;1. School of Aerospace Engineering, Tsinghua University, 100084, Beijing, People''s Republic of China;2. Xi''an Space Radio Academic Institution, 710071, Xi''an, People''s Republic of China;3. Mechanical and Aerospace Engineering Department, University of Rome La Sapienza, 00184, Rome, Italy;1. University of Rome La Sapienza, DIAEE, Italy;2. University of Rome La Sapienza, DIMA, Italy;1. School of Aerospace Engineering (SIA), La Sapienza University of Rome, Via Salaria 851-881, 00138, Rome, Italy;2. Department of Mechanical and Aerospace Engineering (DIMA), La Sapienza University of Rome, Via Eudossiana 18, 00184, Rome, Italy;1. Department of Astronautics, Electric and Energetics, Sapienza Università di Roma, Rome, Italy;2. Department of Mechanical and Aerospace Engineering, Sapienza Università di Roma, Rome, Italy;3. School of Aerospace Engineering, Sapienza Università di Roma, Rome, Italy |
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| Abstract: | Vibrations represent one of the most important topics of the engineering design relevant to flexible structures. The importance of this problem increases when a very flexible system is considered, and this is often the case of space structures. In order to identify the modal characteristics, in terms of natural frequencies and relevant modal parameters, ground tests are performed. However, these parameters could vary due to the operative conditions of the system. In order to continuously monitor the modal characteristics during the satellite lifetime, an operational modal analysis is mandatory. This kind of analysis is usually performed by using classical accelerometers or strain gauges and by properly analyzing the acquired output. In this paper a different approach for the vibrations data acquisition will be performed via image-based technique. In order to simulate a flexible satellite, a free flying platform is used; the problem is furthermore complicated by the fact that the overall system, constituted by a highly rigid bus and very flexible panels, must necessarily be modeled as a multibody system. In the experimental campaign, the camera, placed on the bus, will be used to identify the eigenfrequencies of the vibrating structure; in this case aluminum thin plates simulate very flexible solar panels. The structure is excited by a hammer or studied during a fast attitude maneuver. The results of the experimental activity will be investigated and compared with respect to the numerical simulation obtained via a FEM-multibody software and the relevant results will be proposed and discussed. |
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| Keywords: | Structural tests Optical techniques Free flying flexible multibody systems |
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