Accession Number:

ADA055882

Title:

An Investigation of the Relationship Between Take Off Gross Weight and Mission Requirements for Geometrically Optimized Aircraft.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1977-05-01

Pagination or Media Count:

111.0

Abstract:

A study was performed to demonstrate the feasibility of using surface fit approximations in the mission analysis for future fighter aircraft. Dash Mach number MACH, dash range RNG, and internal payload STR were selected as mission variables and a mission space defined based on a simple latin square method. Wing loading WOS, aspect ratio AR and aircraft thrust-to-weight ratio TW were selected as design variables and a design space defined based on a simple latin square method. The take off gross weight TOGW, take off distance DTO, and the landing distance DLN were determined by the use of a computer program which simulated the required mission for each design case. A regression analysis was performed on this data to obtain quadratic surface fit approximations for TOGW, DTO, and DLN in terms of the design variables WOS, AR, and TW. An unconstrained minimization of TOGW was performed for all missions using a conjugate gradient technique to determine the minimum TOGW within the design space and the corresponding values of DTO and DLN. Another regression analysis was performed on the results of the minimizations and the mission variable for specific missions to obtain quadratic surface fit approximations for TOGW, DTO, and DLN for optimum aircraft in terms of the mission variables MACH, RNG, and STR. It was concluded that these surface fit approximations in terms of the mission variables were sufficiently accurate for use in mission analysis and conceptual design studies. Author

Subject Categories:

  • Attack and Fighter Aircraft
  • Statistics and Probability
  • Computer Programming and Software

Distribution Statement:

APPROVED FOR PUBLIC RELEASE