Phugoid oscillations in optimal reentry trajectories
نویسندگان
چکیده
منابع مشابه
Phugoid Motion for Grazing-Entry Trajectories at Near-Circular Speeds
We analyze the trajectory perturbations that result in phugoid oscillations during the grazing planetary entry of space vehicles starting with near-circular speed, in ballistic and equilibrium glide modes. The equations for planar entry are transformed into a dimensionless system appropriate for an analytical integration that provides accurate results in comparison with those obtained from a nu...
متن کاملThrust - Limited Optimal Three - Dimensional Spacecraft Trajectories
Several optimal three-dimensional orbital transfer problems are solved for thrust-limited spacecrafts using collocation and nonlinear programming techniques. The solutions for full nonlinear equations of motion are obtained where the integrals of the free Keplerian motion in three dimensions are utilized for coasting arcs. In order to limit the solution space, interior-point constraints are use...
متن کاملBiomechanical Investigation of Empirical Optimal Trajectories Introduced for Snatch Weightlifting
The optimal barbell trajectory for snatch weightlifting has been achieved empirically by several researchers. They have studied the differences between the elite weightlifters’ movement patterns and suggested three optimal barbell trajectories (type A, B, and C). But they didn’t agree for introducing the best trajectory. One of the reasons is this idea that the selected criterion by researchers...
متن کاملOptimal Sensor Trajectories in Bearings-Only Tracking
We consider the problem of determining sensor trajectories in the bearings-only tracking of an uncertain target. This work differs from previous research in that we allow the target dynamics to be both uncertain and random; and also consider multi-sensor scenarios. The basis of our technique is to control a measure of estimation error based on the Posterior Cramér-Rao lower bound (PCRLB), and w...
متن کاملOptimal Damping of Forced Oscillations
In this paper we consider a linear discrete-time control system affected by an additive sinusoidal disturbance with known frequencies but unknown amplitudes and phases. The problem is to damp this forced oscillation in an optimal fashion. We show that the natural solution from the point of view of optimal control is neither robust with respect to errors in the frequencies, and thus not optimal ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acta Astronautica
سال: 1981
ISSN: 0094-5765
DOI: 10.1016/0094-5765(81)90001-1