The paper focuses on the theoretical and experimental analysis of the adaptive vibration control of an ultralightweight CFRP telescope arm(Carbon Fibre Reinforced Polymer). The theoretical analysis using a state space representation shows, that due to the nature of such kind of structures with its extremely low eigenfrequencies (in that case around 0,3 Hz) no passive damping measures using piezoelectric elements like PRS and RSP are feasible. For adaptive vibration control the best system performance in means of stability and controllability one gets using a collocated actuator/sensor system. Out of different possible control strategies the PPF algorithms was selected due to its best performance for such kind of structures. A study on the PPF parameters have shown the keys to optimize the controller performance. In that case when using a 2nd order low pass corner frequency of 10 % higher than the to be damped first mode. Having the optimum control parameters identified an additional experimental verification has been performed. Although the experimentally analyzed system has a significant lower first eigenfrequency than calculated due to the specific testsetup and the condition of the specimen the vibration damping technology using PPF control algorithm could be demonstrated successfully. The reached maximum damping factor of 8 % shows the efficiency for this kind of structural vibration control for ultralightweight space structures. The use of piezoelectric actuators can be assessed as promising for future space applications. Nevertheless further study aspects and potential optimization aspects could be identified for future research activities. Main open question is the real possible active structural damping on a long CFRP-boom, which can be determined by experiment only. The comparison of the theoretical and experimental results regarding the PPF control algorithm shows that there are additional physical limitations avoiding the realization of the maximum theoretical damping value.
Adaptive vibration control of an ultralightweight telescope arm
AC, Adaptronic Congress, 2003 ; 13-22
2003
22 Seiten, 22 Bilder, 2 Tabellen, 7 Quellen
Conference paper
English
Raumfahrttechnik , Teleskop , Sonnensegel , kohlenstofffaserverstärkter Kunststoff , experimentelle Untersuchung , theoretische Untersuchung , Eigenfrequenz , Schwingungsregelung , Schwingungsdämpfung , Regelbarkeit , Regelparameter , piezoelektrischer Aktor , Sensor , adaptives System , adaptiver Regler
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