ing system functionality in this way has been shown to allow the conceptual designs for thousands of competing communication satellite constellation architectures to be compared directly.[23] Although the definition is clearly linked to technical functionality, the abstraction is in terms of value delivered to the user. For example, in

In recent years there have been many advances in the miniaturization of electronic and mechanical technologies for space applications. However, the satellite power requirement does not reduce linearly with the satellite mass, creating the need for small satellite deployable arrays. This paper outlines the current state of technology for small satellite deployable structures, briefly discussing ...

It has been recognized that design-for-reliability (DFR) during the conceptual design stage is very challenging. There are several gaps and deficiencies hindering the DFR implementation. The first gap is due to the disconnection between the output of the conceptual design and reliability parameters needed for the reliability modeling. The second gap is between the knowledge available during the...

This article uses a trip attribute approach to examine the relative passenger attractiveness of Bus Rapid Transit (BRT) systems compared to other transit modes. It examines how passengers value trip attributes for on-street bus, BRT, and light rail and heavy rail systems in passenger behavior research. Empirical data is presented which suggests that passengers value trip attributes for BRT and ...

ion Hierarchies for Conceptual Engineering Design 47 Abstraction Hierarchies for Conceptual Engineering Designion Hierarchies for Conceptual Engineering Design

This paper deals with the application of data mining techniques to the conceptual design knowledge for a LV (launch vehicle) with a HRE (hybrid rocket engine). This LV is a concept of the space transportation, which can deliver micro-satellite to the SSO (sun-synchronous orbit). To design the higher performance LV with HRE, the optimum size of each component, such as an oxidizer tank containing...

Conceptual process planning is an activity for designers to evaluate manufacturability and the manufacturing cost in the early design stage for mechanical parts production. Since major manufacturing costs of a product are committed in product specification and design, it is critical to be able to assess manufacturability and cost as early as possible in the design process. At the National Insti...