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http://dx.doi.org/10.5139/JKSAS.2008.36.1.022

Analysis of Helicopter Maneuvering Flight Using the Indirect Method - Part I. Optimal Control Formulation and Numerical Methods  

Kim, Chang-Joo (건국대학교 항공우주정보시스템 공학과)
Yang, Chang-Deok (건국대학교 항공우주정보시스템 공학과)
Kim, Seung-Ho (한국항공우주연구원)
Hwang, Chang-Jeon (한국항공우주연구원)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.36, no.1, 2008 , pp. 22-30 More about this Journal
Abstract
This paper deals with the nonlinear optimal control approach to helicopter maneuver problems using the indirect method. We apply a penalty function to the deviation from a prescribed trajectory to convert the system optimality to an unconstrained optimal control problem. The resultant two-point boundary value problem has been solved by using the multiple-shooting method. This paper focuses on the effect of the number of shooting nodes and initialization methods on the numerical solution in order to define the minimum number of shooting nodes required for numerical convergence and to provide a method increasing convergence radius of the indirect method. The results of this study can provide an approach to improve numerical stability and convergence of the indirect method when we solve the optimal control problems of an inherently unstable helicopter system.
Keywords
helicopter maneuver; optimal control; indirect method;
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