Recent launches using the SoftRide whole-spacecraft vibration isolation system

Abstract

Passive whole-spacecraft vibration isolation systems have been developed for launch vehicles to greatly reduce the dynamic launch loads. To date, three types of isolation systems have been designed, and two types have been flown. The first is a single-axis axial isolation system (SoftRide UniFlex) that provides isolation for predominantly axial loads. This type of system has been flown successfully three times on the Taurus/GFO mission in February 1998, the Taurus/STEX mission in October 1998, and the Taurus/MTI mission in March 2000. The second type of isolation system is a multi-axis device that provides vibration isolation in three axes. This type of system is needed to alleviate dynamic launch loads on the Minotaur vehicle. This multi-axis system inserts flexibility and damping in three orthogonal axes between the launch vehicle and the satellite. The result is that dynamic launch loads with both axial and lateral components can be effectively mitigated. The multi-axis isolation (SoftRide Multiplex) system is a logical extension of the single-axis system and has the same qualities of being simple, passive, small, lightweight, reliable, and highly effective. Two flights have demonstrated the SoftRide Multiplex isolation system to date: these are the Minotaur/JAWSAT mission in January of 2000 and the Minotaur/MightySat mission in July 2000. Coupled loads analyses and flight telemetry data indicate that both the patented UniFlex and Multiplex isolation systems have provided a softer ride to orbit for satellites on small launch vehicles. Additionally, these isolation systems provide extreme reductions to shock and structure-borne acoustic loads.