Evolutionary Algorithm Use in Optimisation of a Launch Vehicle Stack Model

Abstract

Conceptual design of a satellite launch vehicle is a multidisciplinary task which must take into account interactions of discipl ines such as propulsion, aerodynamics, structures, guidance and orbital mechanics. We discuss the initial modeling of a clean sheet design for a satellite launch vehicle capable of placing an Ariane-44L equivalent payload into geostationary transfer orbit. The proposed vehicle is a straight three stage vehicle as distinct from AR44L which was a t hree and a half stage vehicle. The Delta-V capability or “ideal -velocity” of the AR44L is first derived from published data then the proposed design is modelled using a spreadsheet. The Gross Lift-Off Weight of the vehicle is then minimised for the same delta-V as Ariane. Various differences between the two vehicles are discussed. The initial design of an SLV as presented is based on a simple stack model optimised automatically using an evolutionary algorithm. The efficiency of the proposed approach is discussed along with future developments in the areas of vehicle model and multiobjective formulations of the design optimisation problem.