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Optimal Trajectories for the Helicopter in One-Engine-Inoperative Terminal-Area OperationsThis paper presents a summary of a series of recent analytical studies conducted to investigate one-engine-inoperative (OEI) optimal control strategies and the associated optimal trajectories for a twin engine helicopter in Category-A terminal-area operations. These studies also examine the associated heliport size requirements and the maximum gross weight capability of the helicopter. Using an eight states, two controls, augmented point-mass model representative of the study helicopter, continued takeoff (CTO), rejected takeoff (RTO), balked landing (BL), and continued landing (CL) are investigated for both vertical-takeoff-and-landing (VTOL) and short-takeoff-and-landing (STOL) terminal-area operations. The formulation of the non-linear optimal control problems with considerations for realistic constraints, solution methods for the two-point boundary-value problem, a new real-time generation method for the optimal OEI trajectories, and the main results of this series of trajector optimization studies are presented. In particular, a new balanced-weight concept for determining the takeoff decision point for VTOL Category-A operations is proposed, extending the balanced-field length concept used for STOL operations.
Document ID
19970025406
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Chen, Robert T. N.
(NASA Ames Research Center Moffett Field, CA United States)
Zhao, Yi-Yuan
(Minnesota Univ. Minneapolis, MN United States)
Date Acquired
August 17, 2013
Publication Date
April 1, 1997
Subject Category
Aircraft Design, Testing And Performance
Accession Number
97N24960
Distribution Limits
Public
Copyright
Public Use Permitted.
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