Person:
Mavris, Dimitri N.

Permanent Link
https://hdl.handle.net/1853/71501
Associated Organization(s)
ORCID
ArchiveSpace Name Record

Filters

1999 5
1
5
3 2
4 1
5
Reset filters

Settings
Author: Kirby, Michelle Rene × Author: Mavris, Dimitri N. × End date: 1999 × Start date: 1999 ×

Publication Search Results

Now showing 1 - 5 of 5
  • Thumbnail Image
    Item
    Forecasting Technology Uncertainty in Preliminary Aircraft Design
    (Georgia Institute of Technology, 1999-10) Kirby, Michelle Rene ; Mavris, Dimitri N.
    An evolved version of the Technology Identification, Evaluation, and Selection (TIES) method is presented that provides techniques for quantifying technological uncertainty associated with immature technologies. Uncertainty in this context implies forecasting. Forecasting the impact of immature technologies on a system is needed to provide increased knowledge to a decision-maker in the conceptual and preliminary phases of aircraft design. The increased knowledge allows for proper allocation of company resources and program management. The TIES method addresses the milestones encountered during a technology development program, the sources of uncertainty during that development, a potential method for bounding and forecasting the uncertainty, and a means to quantify the impact of any emerging technology. A proof of concept application was performed on a High Speed Civil Transport concept due to its technically challenging customer requirements.
  • Thumbnail Image
    Item
    Technology Identification, Evaluation, and Selection for Commercial Transport Aircraft
    (Georgia Institute of Technology, 1999-05) Mavris, Dimitri N. ; Kirby, Michelle Rene
    This paper outlines a comprehensive, structured, and robust methodology for decision making in the early phases of aircraft design. The proposed approach is referred to as the Technology Identification, Evaluation, and Selection (TIES) method. The nine-step process provides the decision maker/designer with an ability to easily assess and trade-off the impact of various technologies in the absence of sophisticated, time-consuming mathematical formulations for project resource allocation. The method also provides a framework where technically feasible and economically viable alternatives can be identified with accuracy and speed while the impact on the economics is quantified. Furthermore, structured and systematic techniques are utilized to identify possible concepts and evaluation criteria by which comparisons could be made. Through the implementation of each step, the best family of alternatives for a customer-focused overall measure of value can be identified and assessed subjectively or objectively. This method was applied to a 150 passenger, intra-continental commercial transport as a proof of concept investigation.
  • No Thumbnail Available
    Item
    Additional development and systems analyses of pneumatic technology for high speed civil transport aircraft
    (Georgia Institute of Technology, 1999) Willie, F. Scott ; Lee, Warren J. ; Niebur, Curt S. ; Gregory, Scott D. ; Mavris, Dimitri N. ; Tai, Jimmy C. M. ; Kirby, Michelle Rene ; Roth, Bryce Alexander ; Engler, R. J. (Robert J.)
  • Thumbnail Image
    Item
    Takeoff/Landing Assessment of an HSCT with Pneumatic Lift Augmentation
    (Georgia Institute of Technology, 1999-01) Mavris, Dimitri N. ; Kirby, Michelle Rene
    Pneumatic technologies, such as Circulation Control airfoils, have been experimentally demonstrated to generate very high lift coefficients at low angles of attack. These blown airfoils offer great potential for advanced subsonic transports. Yet, the potential of this particular pneumatic technology is not limited to subsonic aircraft. In fact, Circulation Control has been chosen as an enabling technology to be applied on a generic High Speed Civil Transport (HSCT) under NASA Grant NAG-1-1517. Research on this contract was directed to a first-order quantitative estimate of the impact of Circulation Control on the takeoff and landing performance of an HSCT and is summarized in this paper. A reference point was established with an HSCT utilizing conventional high-lift devices that resulted in a takeoff field length of approximately 13,000 ft. The incremental changes in lift and drag established from the wind tunnel experiments performed in the above stated grant were then applied to this configuration and the low speed performance enhancements and degradations were quantified. The application of Circulation Control was shown to reduce the takeoff field length by as much as 31% from the reference point. This result strongly warrants further investigations with higher order analysis since the first order estimate shows significant improvements in low speed performance of an HSCT with Circulation Control pneumatic technology.
  • Thumbnail Image
    Item