Discrete-Roughness Transition for Hypersonic Flight Vehicles

Direct neural control of hypersonic flight vehicles with prediction model in discrete time

In this paper, the direct adaptive neural controller is investigated for the longitudinal dynamics of a generic hypersonic flight vehicle (HFV). The objective of the controller is to make the altitude and velocity to follow a given desired trajectory in the presence of aerodynamic uncertainties. Based on the functional decomposition, the adaptive discrete-time nonlinear controllers are develope...

Transition of hypersonic flow past flat plate with roughness elements

Roughness elements in high speed flows can cause laminar-turbulent transition leading to higher heating rates and drag. Transition of flow past a hemispherical bump placed on a flat plate is explored in this paper for three Mach numbers [3.37, 5.26, 8.23] using direct numerical simulation on unstructured grids. The simulation parameters are chosen to match the experiments carried out by Danehy ...

Discrete-time hypersonic flight control based on extreme learning machine

This paper describes the neural controller design for the longitudinal dynamics of a generic hypersonic flight vehicle (HFV). The dynamics are transformed into the strict-feedback form. Considering the uncertainty, the neural controller is constructed based on the single-hidden layer feedforward network (SLFN). The hidden node parameters are modified using extreme learning machine (ELM) by assi...

Propulsion Systems for Hypersonic Flight

Model Predictive Control Guidance with Extended Command Governor Inner-Loop Flight Control for Hypersonic Vehicles

The paper describes a control system for hypersonic vehicles that consists of an outerloop guidance layer and an inner-loop flight control layer. For the outer-loop, a Model Predictive Control approach is pursued to prescribe the desired bank angle and flight path angle commands so that the vehicle can follow the way points and avoid exclusion zones during its flight. For the inner-loop, a comb...