CUBE - Centre for the Understanding of the Built Environment

No abstract availableDissertation (MArch (Prof))--University of Pretoria, 2007.Architectureunrestricte

Realistic Earth escape strategies for solar sailing

With growing interest in solar sailing comes the requirement to provide a basis for future detailed planetary escape mission analysis by drawing together prior work, clarifying and explaining previously anomalies. Previously unexplained seasonal variations in sail escape times from Earth orbit are explained analytically and corroborated within a numerical trajectory model. Blended-sail control algorithms, explicitly independent of time, which providenear-optimal escape trajectories and maintain a safe minimum altitude and which are suitable as a potential autonomous onboard controller, are then presented. These algorithms are investigated from a range of initial conditions and are shown to maintain the optimality previously demonstrated by the use of a single-energy gain control law but without the risk of planetary collision. Finally, it is shown that the minimum sail characteristic acceleration required for escape from a polar orbit without traversing the Earth shadow cone increases exponentially as initial altitude is decreased

BookMare project 2: of average sunlight

A millimetre 02 event hosted by Kingsgate Project Space. Small books propose events that respond to notions of natural phenomena. Exhibition curated with Finlay Taylor (RCA) of new works created for this project focusing on the book at an intimate scale, offering a small library to browse. Curated by Susan Johanknecht