This paper examines the dynamic behaviors of inflated beam aerospace structures. The principal foci of this investigation are the determination of the damping mechanisms active in strutures constructed from inflated cylindrical beams, development of a practical modeling method for complex structures, and an examination of the difficulties in predicting on-orbit dynamic behavior from ground tests. A Euler-Bernoulli model of the inflated beam is used to determine distributed damping coefficients from modal tests. The results show that the viscous damping in the inflated beam is independent of beam pressure, but that the pressurization stress levels in the beam fabric affect the strain-rate damping. The Euler-Bernoulli inflated beam model is used in conjunction with a conventional finite element package to model the dynamic behavior of a complex inflated beam structure, a 1.7-m-diam inflated dish antenna mockup. The model accurately predicts the lower natural frequencies of the dish structure. A comparison of modal tests of inflated beam structures performed both in the near weightlessness of the NASA KC-135 low gravity simulator aircraft and in a ground laboratory demonstrates that gravity level can have a dramatic effect on system damping.
Dynamic analysis of space-based inflated beam structures
Dynamische Untersuchung von weltraumgestützten aufgepumpten Trägerstrukturen
Journal of the Acoustical Society of America ; 97 , 2 ; 1035-1045
1995
11 Seiten, 14 Bilder, 3 Tabellen, 24 Quellen
Aufsatz (Zeitschrift)
Englisch
Dämpfungsfunktion , dynamische Eigenschaft , Bernoulli-Gleichung , Euler-Gleichung , Blasen , Schwerkraft , Simulationsversuch , Steifigkeit , Finite-Elemente-Methode , praktische Untersuchung , Schwingungssystem , Eigenschwingung , pneumatisches Bauelement , atmosphärischer Druck , Weltraum , Raumfahrttechnik
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