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Sökning: WFRF:(Grover Piyush)

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1.
  • Grover, Piyush, et al. (författare)
  • Optimized Three-Body Gravity Assists and Manifold Transfers in End-to-End Lunar Mission Design
  • 2012
  • Ingår i: Advances in the Astronautical Sciences (Spaceflight Mechanics 2012: Proceedings of the 22nd AAS/AIAA Space Flight Mechanics Meeting). - 0065-3438 .- 1081-6003. - 9780877035817 - 9780877035824 ; 143 (2012), s. 1189-1203
  • Konferensbidrag (refereegranskat)abstract
    • We describe a modular optimization framework for GTO-to-moon mission design using the planar circular restricted three-body problem (PCR3BP) model. The three-body resonant gravity assists and invariant manifolds in the planar restricted three-body problem are used as basic building blocks of this mission design. The mission is optimized by appropriately timed delta-Vs, which are obtained by a shooting method and a Gauss-Pseudospectral collocation method for different phases of the mission. Depending upon the initial and final orbits, the optimized missions consume between 10-15 % less fuel compared to a Hohmann transfer, while taking around 4 to 5 months of travel time.
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2.
  • Nilsson, Gustav, et al. (författare)
  • Assignment and Control of Two-Tiered Vehicle Traffic
  • 2018
  • Ingår i: 57th IEEE Conference on Decision and Control. - 9781538613955 ; , s. 1023-1028
  • Konferensbidrag (refereegranskat)abstract
    • This work considers the assignment of vehicle traffic consisting of both individual, opportunistic vehicles and a cooperative fleet of vehicles. The first set of vehicles seek a user-optimal policy and the second set seeks a fleet-optimal policy. We provide explicit sufficient conditions for the existence and uniqueness of a Nash equilibrium at which both policies are satisfied.We also propose two different algorithms to determine the equilibrium, one centralized and one decentralized. Furthermore, we present a control scheme to attain such an equilibrium in a dynamical network flow. An example is considered showing the workings of our scheme and numerical results are presented.
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  • Resultat 1-2 av 2

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