Direct Dynamic-Simulation Approach to Trajectory Optimization for Rotorcraft Category-A Maneuver Procedures

Autor: Yi Young Kwak, Chang-Joo Kim, Seong Han Lee, Sung Wook Hur, Yong Hyeon Nam
Rok vydání: 2020
Předmět:
Zdroj: International Journal of Aeronautical and Space Sciences. 22:648-662
ISSN: 2093-2480
2093-274X
DOI: 10.1007/s42405-020-00322-2
Popis: This paper treats numerical methods for an efficient prediction of the rotorcraft emergency procedures after engine failures. The analytical means of compliance for the Category-A requirements can be used for the type certification of the transport-category rotorcraft when their fidelities are approved by the civil airworthiness authority. However, the most promising trajectory optimization approaches to the Category-A maneuver analyses typically suffer from a dimensionality problem when a high-fidelity math model is adopted. To cope with such difficulties, the paper proposes new techniques, where the system states except the initial ones and all dynamic constraints are removed from the resultant nonlinear programming problem. For these proposes, the controls are parameterized using the Hermit splines with the local support and efficient recursive formulas to predict the constraint-function Jacobians are derived. The efficiency of the proposed techniques is compared with that using the pseudo-spectral collocation method. In addition to an autorotational descent maneuver, four Category-A procedures for the continued takeoff, rejected takeoff, continued landing, and balked landing maneuvers are analyzed with varying the engine-failure conditions and with a suitable consideration on the pilot-delay time to validate the usefulness of the proposed methods.
Databáze: OpenAIRE
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