Matrix Modeling Methods for Spaceflight Campaign Logistics Analysis

摘要

This paper proposes amatrix-basedmodeling approach for analyzing spaceflight campaign logistics. A campaignnis considered to be a series of coordinated flights delivering cargo at a location or node.Amatrix representation of thencargo carried by flights for consumption in different time periods (or missions) is formulated. The matrix adoptsnspecific structures based on the nature of the campaign, thereby allowing a quick visualization of the campaignnlogistics properties. A logistics strategy index is proposed for quantifying manifesting strategies, and a flightncriticality index is defined to help in identifying important flights from a cargo-delivery perspective and aid innassessing impact of flight cancellations, failures, and delays. The method is demonstrated on a lunar outpostnestablishment and is also applied in modeling the logistics of the International Space Station. Amanifest (M)matrixnand flight dependency (D) matrix is created for crew provisions cargo delivered to the ISS over a period of 10 years.nIt is found that the overall logistics strategy index for crew provisions has so far been 0.85 (meaning 85% of thencrew provisions cargo is prepositioned on average for each mission) and that the prepositioning is for up to anmaximum of four future missions at a time.