Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Prasun N. Desai"'
Publikováno v:
Journal of Spacecraft and Rockets. 48:765-771
A multibody flight simulation for the Phoenix Mars Lander was developed that included high-fidelity six-degreeof-freedom rigid-body models for the parachute and lander system. The simulation predicted attitude and rate histories of all bodies through
Publikováno v:
Journal of Spacecraft and Rockets. 48:778-783
The Mars Phoenix lander was launched August 4, 2007 and remained in cruise for ten months before landing in the northern plains of Mars in May 2008. The one-month Entry, Descent, and Landing (EDL) operations phase prior to entry consisted of daily an
Publikováno v:
Journal of Spacecraft and Rockets. 48:713-726
Publikováno v:
Journal of Spacecraft and Rockets. 48:746-755
Interaction between the external flowfield and the reaction control system (RCS) thruster plumes of the Phoenix capsule during entry has been investigated. The analysis covered rarefied, transitional, hypersonic and supersonic flight regimes. Perform
Autor:
Jill L. Prince, Juan R. Cruz, Eric M. Queen, Myron R. Grover, Mark Schoenenberger, Prasun N. Desai
Publikováno v:
Journal of Spacecraft and Rockets. 48:798-808
On May 25, 2008, the Mars Phoenix Lander successfully landed on the northern arctic plains of Mars. An overview of a preliminary reconstruction analysis performed on each en-try, descent, and landing phase to assess the performance of Phoenix as it d
Autor:
Prasun N. Desai, Robert C. Blanchard
Publikováno v:
Journal of Spacecraft and Rockets. 48:809-822
Autor:
Garry D. Qualls, Prasun N. Desai
Publikováno v:
Journal of Spacecraft and Rockets. 47:736-740
An overview of the reconstruction analyses performed for the Stardust capsule entry is described. The results indicate that the actual entry was very close to the pre-entry predictions. The capsule landed 8.1 km north-northwest of the desired target
Publikováno v:
Journal of Spacecraft and Rockets. 45:1262-1268
Autor:
Bruce A. Conway, Prasun N. Desai
Publikováno v:
Journal of Guidance, Control, and Dynamics. 31:1316-1322
The development of a two-timescale discretization scheme for collocation is presented. This scheme allows a larger discretization to be utilized for smoothly varying state variables and a second finer discretization to be utilized for state variables
Autor:
Prasun N. Desai, Bruce A. Conway
Publikováno v:
Journal of Guidance, Control, and Dynamics. 31:1308-1315
Six-degree-of-freedom (6DOF) trajectory optimization of a reentry vehicle is solved using a two-timescale collocation methodology. This class of 6DOF trajectory problems are characterized by two distinct timescales in their governing equations, where