scholarly journals Numerical Study of Plasma-Assisted Aerodynamic Control for Hypersonic Vehicles

2008 ◽  
Author(s):  
Nicholas Bisek ◽  
Iain Boyd ◽  
Jonathan Poggie
Keyword(s):  
Numerical Study ◽  
Hypersonic Vehicles ◽  
Aerodynamic Control

scholarly journals Numerical Study of Plasma-Assisted Aerodynamic Control for Hypersonic Vehicles

2009 ◽  
Vol 46 (3) ◽  
pp. 568-576 ◽  
Author(s):  
Nicholas J. Bisek ◽  
Iain D. Boyd ◽  
Jonathan Poggie
Keyword(s):  
Numerical Study ◽  
Hypersonic Vehicles ◽  
Aerodynamic Control

scholarly journals Disturbance Observer-Based Adaptive Control of Hypersonic Vehicles with Constrained Actuators

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Guan Wang ◽  
Li Li ◽  
Weihua Li ◽  
Huajun Zhou ◽  
Changbo Ma ◽  
...  
Keyword(s):  
Disturbance Observer ◽  
Input Saturation ◽  
Adaptive Controller ◽  
Hypersonic Vehicles ◽  
Control Allocation ◽  
External Disturbances ◽  
Nonlinear Disturbance Observer ◽  
Aerodynamic Control ◽  
Actuator Constraints ◽  
Control Surfaces

This study investigates an adaptive controller for the flexible air-breathing hypersonic vehicles (AHVs) subject to external disturbances and actuator constraints. The combination of nonlinear disturbance observer and adaptive mechanism is exploited to design an adaptive controller for each subsystem. For the velocity subsystem, an auxiliary system is employed to handle the scramjet input saturation issue. For the altitude subsystem, the magnitude/rate constraints and the dynamics of aerodynamic control surfaces are addressed by the control allocation module. Simulations show the effectiveness of the proposed control.

scholarly journals Numerical Study of Active Aerodynamic Control via Flow Discharge on a High-Camber Rear Spoiler of a Road Vehicle

2019 ◽  
Vol 9 (22) ◽  
pp. 4783 ◽  
Author(s):  
LEE ◽  
KIM
Keyword(s):  
Stokes Equations ◽  
Aerodynamic Drag ◽  
Numerical Study ◽  
Control Flow ◽  
Separation Flow ◽  
Road Vehicle ◽  
Flow Discharge ◽  
Driving Speed ◽  
Aerodynamic Control ◽  
Rear Spoiler

In this study, a numerical investigation of the active aerodynamic control via flow discharge was performed on a two-dimensional simplified vehicle with a spoiler. The analysis was performed using computational fluid dynamics techniques based on the unsteady Reynolds averaged Navier–Stokes equations. Unlike the conventional aerodynamic control methods, in which the control flow is forcibly injected to increase the lift or reduce the drag, the flow discharge method uses the ram air flow to reduce both the downforce and aerodynamic drag of a road vehicle. The technique of aerodynamic control via the flow discharge is applied to a simplified vehicle with a rear spoiler. For the isolated spoiler, at a discharge speed of 40% of the vehicle driving speed, the flow discharge at 75% of the chord exhibited a reduction of 4.5% and 1.8% in the aerodynamic drag and downforce reduction, respectively. For the vehicle with a spoiler, the drag and downforce were respectively reduced, on average, by 3.4% and 19.3% for a vehicle velocity range of 100–300 km/h; in this case, the discharge speed was 40% of the vehicle driving speed, and the discharge position was 75% of the chord owing to the interaction between the spoiler separation flow and vehicle wake.

Numerical study of the low-frequency atomic dynamics in a Lennard-Jones glass

1998 ◽  
Vol 77 (2) ◽  
pp. 473-484 ◽  
Author(s):  
M. Sampoli, P. Benassi, R. Dell'Anna,
Keyword(s):  
Numerical Study ◽  
Low Frequency ◽  
Lennard Jones
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