Issue 10 Volume 41 May 16, 2003

established, a baseline concept is created. Next, the design space is explored to determine the feasibility and viability of the
baseline aircraft configuration. If the design is neither feasible nor viable, new technologies can be implemented to open up
the feasible design space and allow for a plausible solution. After the new technologies are identified, they must be evaluated
to determine the physical compatibility of integrating multiple technologies and then the impact on the design, both
improvements and degradations, must be determined. These technologies are assessed deterministically. Again, Response
Surface Equations (RSEs) are developed to allow for a full factorial evaluation of the combinations of the technologies. The
best combination of technologies is selected and then the design space is again reevaluated for feasibility and viability.
Author
Passenger Aircraft; Design Analysis; Product Development; Aircraft Design; Design Optimization; Commercial Aircraft
20030032965 Georgia Inst. of Tech., Atlanta, GA, USA
Exploration of Advanced Probabilistic and Stochastic Design Methods
Mavris, Dimitri N.; March 31, 2003; 46 pp.; In English; Original contains color illustrations
Contract(s)/Grant(s): NAG1-2235; No Copyright; Avail: CASI; C01, CD-ROM; A03, Hardcopy
The primary objective of the three year research effort was to explore advanced, non-deterministic aerospace system
design methods that may have relevance to designers and analysts. The research pursued emerging areas in design
methodology and leverage current fundamental research in the area of design decision-making, probabilistic modeling, and
optimization. The specific focus of the three year investigation was oriented toward methods to identify and analyze emerging
aircraft technologies in a consistent and complete manner, and to explore means to make optimal decisions based on this
knowledge in a probabilistic environment. The research efforts were classified into two main areas. First, Task A of the grant
has had the objective of conducting research into the relative merits of possible approaches that account for both multiple
criteria and uncertainty in design decision-making. In particular, in the final year of research, the focus was on the comparison
and contrasting between three methods researched. Specifically, these three are the Joint Probabilistic Decision-Making
(JPDM) technique, Physical Programming, and Dempster-Shafer (D-S) theory. The next element of the research, as contained
in Task B, was focused upon exploration of the Technology Identification, Evaluation, and Selection (TIES) methodology
developed at ASDL, especially with regards to identification of research needs in the baseline method through implementation
exercises. The end result of Task B was the documentation of the evolution of the method with time and a technology transfer
to the sponsor regarding the method, such that an initial capability for execution could be obtained by the sponsor. Specifically,
the results of year 3 efforts were the creation of a detailed tutorial for implementing the TIES method. Within the tutorial
package, templates and detailed examples were created for learning and understanding the details of each step. For both
research tasks, sample files and tutorials are attached in electronic form with the enclosed CD.
Author
Design Optimization; Decision Making; Stochastic Processes
20030033934 California Polytechnic State Univ., San Luis Obispo, CA, USA
Runway Independent Aircraft Extremely Short Takeoff and Landing Regional Airliner: The Model 110
Hall, David W.; April 15, 2003; 43 pp.; In English; Original document contains extra large color foldouts which cannot be
scanned. Original doucment also contains color illustrations.
Contract(s)/Grant(s): NCC2-5508; No Copyright; Avail: CASI; A03, Hardcopy
Airports throughout the USA are plagued with growing congestion. With the increase in air traffic predicted in the next
few years, congestion will worsen. The accepted solution of building larger airplanes to carry more travelers is no longer a
viable option, as airports are unable to accommodate larger aircraft without expensive infrastructure changes. Past NASA
research has pointed to the need for a new approach, which can economically and safely utilize smaller airports. To study this
option further, NASA requested the California Polytechnic State University at San Luis Obispo (Cal Poly/SLO) to design a
baseline aircraft to be used for system studies. The requirements put forth by NASA are summarized. The design team was
requested to create a demonstrator vehicle, which could be built without requiring enabling technology development. To this
end, NASA requested that the tested and proven high-lift system of the Boeing C-17 Globemaster III be combined with the
fuselage of the BAe-146. NASA also requested that Cal Poly determine the availability and usability of underutilized airports
starting with California, then expanding if time and funds permitted to the U.S.
Derived from text
Aircraft Landing; Runways; Aircraft Models; Short Takeoff Aircraft; Aircraft Performance; Aircraft Design
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