Abstract
Theoretical studies were conducted to clarify hydroelastic vibrations of a tank filled with liquid and flexible space structure under low-gravity. The satellite has a central rigid body with tank filled with liquid fuel and two flexible appendages like solar array. The liquid in central body were treated spring-mass system and the appendages were considered as the Euler-Bernoulli beams joined to the central body with a torsion spring. Assuming the system vibrates in the axial direction of a tank, we derived the frequency equation by Rayleigh-Ritz method. Coupled natural frequencies were obtained as an eigenvalue. With increase in torsion spring constant, coupled natural frequencies increase.
