Accession Number:

AD0860596

Title:

A Search for the Minimum-Fuel Landing Trajectory of a Tilt-Wing VTOL Aircraft.

Descriptive Note:

Master's thesis,

Corporate Author:

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

Personal Author(s):

Report Date:

1969-05-01

Pagination or Media Count:

194.0

Abstract:

Optimal control techniques are used to find the minimum-fuel landing trajectory of a tilt-wing VTOL aircraft. A fourth-order, nonlinear, mathematical model of the XC-142A was used, employing three controls wing incidence, thrust and a limited authority pitch control. Optimization was accomplished by the conjugate gradient method using penalty functions to control terminal error and constrained variables. A control variable transformation was used to constrain the controls. To start the optimization algorithm, initial controls were computed to perform a landing trajectory with the model without exceeding the constraints. The increase in computing time due to the transformation was negligible. Convergence to terminal conditions was hindered by a wing lift anomaly. Author

Subject Categories:

  • Transport Aircraft
  • VSTOL

Distribution Statement:

APPROVED FOR PUBLIC RELEASE