Injection into Orbit Optimization using Orthogonal Polynomials

ADMT Journal

مقاله 8، دوره 9، شماره 3، آذر 2016، صفحه 65-75   

نوع مقاله: Original Article

نویسندگان

Sedigheh Shahmirzaee Jeshvaghany^{* 1}؛ Farshad Pazooki²؛ Alireza Basohbat Novinzaddeh³

¹Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

²Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.

³Department of Aerospace Engineering, K.N.Toosi University of Technology, Tehran, Iran

چکیده

In this study, the problem of determining an optimal trajectory of a nonlinear injection into orbit problem with minimum time was investigated. The method was based on orthogonalpolynomial approximation. This method consisted of reducing the optimal control problem to a system of algebraic equations by expanding the state and control vector as Chebyshev or Legendre polynomials with undetermined coefficients. The main characteristic of this technique was that it converted the differential expressions arising from the system dynamics and the performance index into some nonlinear algebraic equations, thereby greatly simplifying the problem solution. Our research effort focused on applying a Chebyshev series expansion to optimize the trajectory profile of a point-mass Satellite Launch Vehicle (SLV). This paper is divided as follows: first, the Chebyshev and Legender series expansion to optimization are introduced. Then, the flight mechanics model of the point-mass SLV is given. Next, our optimization problem is described and optimization results are presented and discussed.

کلیدواژه‌ها

Chebyshev and legendre polynomials؛ Orthogonal functions؛ Point-mass SLV؛ Trajectory

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