The design of an advanced launcher, such as an aerospace plane, is strongly dependent on flight simulation. The performance of the propulsion system, highly integrated with the airframe construction, is,for instance, largely influenced by flight conditions. Within the framework of the Space-Plane Project of the Faculty of Aerospace Engineering (Delft University of Technology), a proposal is made for theconceptual design of space planes, with the emphasis on trajectory simulation. The layout of a design package is presented. This package consists of several modules, e.g., the design of the aerothermodynamic configuration, the (air-breathing) propulsion system and the geometry and mass properties. To compute the optimal trajectory for a given design (based on, for instance, minimal fuel consumption), two possible Trajectory Optimizers are reviewed, namely ALTOS and ASCENT. The otpimized trajectory will serve as an input for a six-degrees-of- freedomflight-dynamics software. This software is based on the re-entry simulation tool START. Extensions with respect to the current version are presented to meet the requirements for proving the steerability and controllability of the space plane. The main extensions are related to variable mass properties, guidance and control, and propulsion. (Copyright (c) 1994 by E. Mooij, Delft.)


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