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 outputs. 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 simulating 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. Copyright © (2012) by the International Astronautical Federation.

Operational modal analysis via image based technique of very flexible space structures / Sabatini, Marco; Gasbarri, Paolo; Palmerini, Giovanni Battista; Monti, Riccardo. - ELETTRONICO. - 8:(2012), pp. 6311-6321. (Intervento presentato al convegno 63rd International Astronautical Congress 2012, IAC 2012 tenutosi a Naples; Italy nel 1 October 2012 through 5 October 2012).

Operational modal analysis via image based technique of very flexible space structures

SABATINI, MARCO;GASBARRI, Paolo;PALMERINI, Giovanni Battista;MONTI, RICCARDO
2012

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 outputs. 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 simulating 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. Copyright © (2012) by the International Astronautical Federation.
2012
63rd International Astronautical Congress 2012, IAC 2012
natural frequencies; operational modal analysis; space systems; visual based techniques
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Operational modal analysis via image based technique of very flexible space structures / Sabatini, Marco; Gasbarri, Paolo; Palmerini, Giovanni Battista; Monti, Riccardo. - ELETTRONICO. - 8:(2012), pp. 6311-6321. (Intervento presentato al convegno 63rd International Astronautical Congress 2012, IAC 2012 tenutosi a Naples; Italy nel 1 October 2012 through 5 October 2012).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/483651
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