5,313 research outputs found
Application of local linearization and the transonic equivalence rule to the flow about slender analytic bodies at Mach numbers near 1.0
The local linearization method for axisymmetric flow is combined with the transonic equivalence rule to calculate pressure distribution on slender bodies at free-stream Mach numbers from .8 to 1.2. This is an approximate solution to the transonic flow problem which yields results applicable during the preliminary design stages of a configuration development. The method can be used to determine the aerodynamic loads on parabolic arc bodies having either circular or elliptical cross sections. It is particularly useful in predicting pressure distributions and normal force distributions along the body at small angles of attack. The equations discussed may be extended to include wing-body combinations
Effects of nacelle shape on drag and weight of a supersonic cruising aircraft
The quantitive relationship of cruise drag and nacelle shape was investigated for a representative advanced supersonic transport configuration. Nacelle shape parameters were systematically varied, and the effects of these variations on wave and friction drag were determined. The effects of changes in vehicle drag, propulsion weight, and specific fuel consumption on vehicle takeoff gross weight were computed. Generally, it was found that nacelle shapes such that the maximum cross-sectional area occurred at or near the nozzle exit resulted in the lowest wave drag. In fact, nacelle shapes were found that produce favorable interference effects (drag reduction) of such magnitude as to nearly offset the friction drag of the nacelle
Summary Report: Systematic IPT Integration in Lean Development Programs
This document provides a summary report of the M.I.T. Masters Thesis, "Systematic IPT Integration in Lean Development Programs" by Tyson R. Browning. These studies argue for the inclusion of program integration principles as an essential aspect of lean enterprise product development and organization.Lean Aerospace Initiativ
Exploring Integrative Mechanisms with a View Towards Design for Integration
The integrated product development (IPD) paradigm has
gained recognition as a preferred approach to product
development. In complex system development programs, the
concurrent engineering aspect of IPD is often approached
through the use of integrated product teams (IPTs), each
assigned to develop various components of the overall system.
Many have struggled to determine the characteristics of highly
effective IPTs and the circumstances in which particular
perspectives should be incorporated within an IPT. However,
much less research has addressed the nature and management of
the relationships between IPTs—the integration of IPTs within
a program. While many have lamented that coordination
problems have played a large part in diminishing the
performance of their overall programs, a systematic approach
for considering these issues a priori in program design is
lacking. This paper presupposes a familiarity with interteam
integration issues and (1) describes a framework for thinking
about organization integration within a program, (2) presents
integrative mechanisms (IMs) useful for managing IPT
interfaces, and (3) begins to develop a systematic approach for
designing programs that explicitly considers integration
needs, design for integration (DFI)
Paper Session III-C - A New Old Way to Space: Taking the Best From the Past to Forge Ahead into the Future
The next step in space exploration must be on a scale that has never been experienced before. In order to construct a fully functioning spaceport, tremendous amounts of cargo and materials as well as large numbers of people will have to be transported into orbit. The size of the program and the spaceport that will have to be built will be orders of magnitude greater than anything yet accomplished.
Unlike ISS Alpha, the spaceport will have to support more than just research. For it to be economically feasible, it must provide space and services to a number of different operations. Manufacturing, tourism, research, construction, commerce and exploration are just some of the activities that will take place on or from the spaceport. These requirements dictate that the spaceport be able to provide space and services for over 300 people to live and work. If the spaceport is assumed to be a circular design providing artificial gravity such as the one proposed by von Braun and exemplified in 2001: A Space Odyssey it could easily exceed 500 meters in diameter.
The effort to lift the amount of material needed to construct a spaceport of this size is staggering. Current vehicles and methods will be unable to achieve the needed volume or launch frequency. A new set of systems and vehicles must be developed. The lessons of the past must be re-evaluated and integrated into the new program. By combining methods developed for Apollo, SkyLab, Mars Pathfinder and the Space Shuttle with modern materials and technology a new “old way” to lift mass into space becomes possible.
This paper will explore this new “old way” and how the achievements of the past will help illuminate the way into the future
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