TY - JOUR ID - 51509 TI - Nonlinear Optimal Control Techniques Applied to a Launch Vehicle Autopilot JO - Journal of Aerospace Science and Technology JA - JAST LA - en SN - 1735-2134 Y1 - 2006 PY - 2006 VL - 3 IS - 1 SP - 43 EP - 49 DO - N2 - This paper presents an application of the nonlinear optimal control techniques to the design of launch vehicle autopilots. The optimal control is given by the solution to the Hamilton-Jacobi-Bellman (HJB) equation, which in this case cannot be solved explicity. A method based upon Successive Galerkin Approximation (SGA), is used to obtain an approximate optimal solution. Simulation results involving three degrees of freedom (3DOF) model of a launch vehicle during atmospheric flight are reported to demonstrate the performance of the considered autopilot. Alternative results are also presented for classical and linear optimal approaches. UR - https://jast.ias.ir/article_51509.html L1 - https://jast.ias.ir/article_51509_b27089c3b86bb7386781cfcaadd8504c.pdf ER -