The structure of the double launch system Ariane Sylda

Characteristics of the Sylda shroud atop the Ariane vehicle for the simultaneous launch of two satellites are described. Study considerations are cited to underscore the choice of axial separation for the higher placed payload, with a sandwich composite shell, while the lower satellite is supported on the Ariane cone. A cylindrical structure between the satellites permits adjustments for different heights of the lower payload, with a 3900 mm total length suitable for the Ariane I and II configurations and 4400 mm for the Ariane III. The Sylda nose cone is constrained to a mass between 600-1200 kg, to a center of gravity 700-850 mm above the separation plane, longitudinal frequency between 38-45 Hz, and a lateral frequency of 15 Hz. The BOSOR IV program was employed to model the cone for static and dynamic loading. Laboratory tests have confirmed that the designed tolerances are acceptable.