Aerothermodynamic Studies on Hypersonic Vehicle.

Review of X-33 Hypersonic Aerodynamic and Aerothermodynamic Development

A review of the experimental and computational studies performed at NASA Langley Research Center (LaRC) to support the optimization and benchmarking of the hypersonic aerodynamic and aerothermodynamic databases for the X-33 vehicle is presented. A synoptic of the testing, computational, and analysis capabilities at LaRC applied to these studies is given. Analyses of the hypersonic aerodynamic c...

Applications of Underexpanded Jets in Hypersonic Aerothermodynamic Research

A method of underexpanded hypersonic viscous jets has been developed to acquire experimental aerodynamic data for wedges and plates in the transitional regime between free-molecular and continuum regimes. The kinetic, viscous, and rotational nonequilibrium quantum processes in the jets of He, Ar, N2, and CO2 under various experimental conditions have been analyzed by asymptotic methods and nume...

Effects of increasing aerothermodynamic fidelity on hypersonic trajectory optimisation for flight testing purposes

Hypersonic Vehicle Tracking based on Improved Current Statistical Model

A new method of tracking the near space hypersonic vehicle is put forward. According to hypersonic vehicles’ characteristics, we improved current statistical model through online identification of the maneuvering frequency. A Monte Carlo simulation is used to analyze the performance of the method. The results show that the improved method exhibits very good tracking performance in comparison wi...

Hypersonic Vehicle Trajectory Optimization and Control

This paper presentsa classofmodifiedHopfieldneuralnetworks and theiruse insolvingaircraftoptimalcontroland identificationproblems.This classofnetworksconsistsofparallelrecurrentnetworks which have variabledimensions that can bechanged tofithe problemsunder considezal;ion.Ithas a structureto implement aninversetransformationthatisessentialforembedding opti...