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Topology Optimization Design of Spacecraft Antenna Pedestal Structure under Random Excitations

The purpose of this paper is to demonstrate a topology optimization design of the spacecraft antenna pedestal structure to save the structural weight as well as maintain the dynamic performances. The dynamic responses under random acceleration excitations are analyzed firstly and then the peaks of acceleration response are equaled to be static inertial load in the topology optimization as an expedient method. The pseudo-density based topology optimization model considering stress under inertial load as constraint is then formulated, and then further detailed design of the pedestal is carried out according to the optimized structural topology. Compared with the initial design, the optimized structure is improved with the total weight saved and both the dynamic responses and static stress satisfied.