The reduction of cost is a growing issue in spaceflight projects today. Therefore this work investigates two approaches, which are strongly interrelated, to reach the overall cost reduction goal: reduction of S/C component costs through use of commercial off-the-shelf (COTS) components; more efficient S/C development processes through standardization of describing S/C architectures. The investigation of those two approaches leads to two questions that shall be answered in this work: 'Does the use of COTS components in S/C architectures bring overall benefits for the project?' and 'What is the architecture of a S/C and how can its description be standardized?' To answer these questions, this work defines and describes tools and methodologies, which are treated in three main parts in this work: the first part treats the standardized description of S/C architectures, the next part describes a generic evaluation process for assessing COTS components and the third part shows some means to evaluate the performance of S/C architectures with and without COTS components. The first part starts with an analysis of state-of-the-art methods for standardized descriptions of architectures in the spaceflight domain. Architecture frameworks (AFs) are therein identified as a solution approach. Due to the non-existence of an AF for S/C this work defines the new S/C architecture framework (SCAF). This includes the identification of relevant system viewpoints, which are necessary for describing S/C, together with required content, and the specification of rules and templates for creating those. The framework uses the standardized modeling language SysML to enhance generic applicability and wide acceptance among S/C development teams. The middle part of this work describes a generic evaluation process for assessing COTS components. It starts with an identification of generic and specific properties of COTS components compared to traditional components in space engineering. Both sides of using COTS are explored: potential benefits and arising problems when those components are used, including state-of-the-art solution approaches to overcome those problems. The next step introduces a new generic evaluation procedure, how to assess COTS components and identify potential candidates for space projects. It defines three major steps, all dedicated to a specific time horizon going from strategic long term planning to actual decisions for individual space projects. The last part introduces a standardized modeling of the performance view for S/C which is necessary to evaluate S/C architectures. The first step identifies important metrics which describe the performance of a S/C architecture. The basis for the implementation of the performance view is the standardized description of S/C architectures with SCAR. This work enhances SCAF by developing the new S/C performance model (SCPM) using an objed-oriented quantitative modeling technique implemented in the modeling software (v)Sys. Each of the three main parts of this work is supported by one case study, each demonstrating the application of provided tools and methodologies. These case studies are also used to evaluate the quality of the new means shown in this work and to identify potential open issues. The work closes with an extensive conclusion of collected experiences and an outlook into the future.


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    Titel :

    Spacecraft architectures using commercial off-the-shelf components


    Weitere Titelangaben:

    Raumfahrzeugarchitekturen mit Hilfe kommerziell verfügbarer Komponenten


    Beteiligte:

    Erscheinungsdatum :

    2008


    Format / Umfang :

    215 Seiten, Bilder, Tabellen, 119 Quellen



    Medientyp :

    Hochschulschrift


    Format :

    Print


    Sprache :

    Englisch





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