The bi-propellant satellites with a mission life of more than 7 years require a special type of propellant device system. Due to the longer duration of missions and the use of bi-propellants for the apogee boost phase of the satellites, the tanks had to become larger and the percentage of fluid mass to satellite overall mass consequently had risen to 50. This high mass ratio of 'fluid to structure' requires a more sophisticated approach for the investigation of loads due to the dynamic behaviour of the fluid and the fluid-structure interactions. The fluid mass cannot be considered as "frozen mass" as done in earlier calculations of the whole satellite. Therefore, an analytical tool had to be found with the capability to represent the fluid behaviour and to give answers to questions concerning structures coupled with fluids. This paper will give a short description of the dynamic investigations performed for the qualification of the tanks.
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