Numerical Investigation on Unsteady Flows with an Air-breathing Hypersonic Vehicle During its Shroud Separation

2017 ◽  
Author(s):  
Shengyi Wang ◽  
Chao Li ◽  
Wei Chen
Keyword(s):  
Numerical Investigation ◽  
Unsteady Flows ◽  
Hypersonic Vehicle ◽  
Air Breathing

Prediction of dynamic derivatives for air-breathing hypersonic vehicle using a harmonic balance method

2019 ◽  
Vol 233 (13) ◽  
pp. 4966-4979
Author(s):  
Zhenxia Chai ◽  
Wei Liu ◽  
Xiaoliang Yang ◽  
Xu Liu
Keyword(s):  
Time Domain ◽  
Harmonic Balance ◽  
Unsteady Flows ◽  
Harmonic Balance Method ◽  
Hypersonic Vehicle ◽  
Time Domain Method ◽  
Balance Method ◽  
Air Breathing ◽  
Domain Method ◽  
The Time Domain

The harmonic balance method is an efficient frequency-domain approach for computing periodically unsteady flows. Applying harmonic balance method to the rapid calculation of forced periodic motions, an efficient prediction method for dynamic derivatives is established based on the Etkin unsteady aerodynamic model. The method is firstly validated by a standard model of the hypersonic missile hyper ballistic shape, and the harmonic balance method results show great consistency with both time-domain results and experimental data, consolidating the efficiency of our numerical algorithm. The method is subsequently applied for an air-breathing hypersonic vehicle to investigate the capability of the harmonic balance method in modeling unsteady flows around complex geometric configurations. Comparisons with the results of the time-domain method demonstrate that the harmonic balance method is capable of resolving such complicated flowfield with both accuracy and efficiency. To be specific, for the air-breathing hypersonic vehicle, the maximum difference of the dynamic derivatives calculated by the harmonic balance method and the time-domain method is only 6.56%, and the harmonic balance method shows at least an order of magnitude efficiency over the general time-domain method in the current study.

Anti-Windup Control for an Air-Breathing Hypersonic Vehicle Model

2005 ◽  
Author(s):  
Kevin P. Groves ◽  
Andrea Serrani ◽  
Stephen Yurkovich ◽  
Michael A. Bolender ◽  
David B. Doman
Keyword(s):  
Hypersonic Vehicle ◽  
Vehicle Model ◽  
Air Breathing

Robust fixed-time sliding mode controller for flexible air-breathing hypersonic vehicle

2019 ◽  
Vol 90 ◽  
pp. 1-18 ◽  
Author(s):  
Yibo Ding ◽  
Xiaogang Wang ◽  
Yuliang Bai ◽  
Naigang Cui
Keyword(s):  
Sliding Mode ◽  
Fixed Time ◽  
Hypersonic Vehicle ◽  
Sliding Mode Controller ◽  
Air Breathing

scholarly journals Fuzzy-Approximation-Based Novel Back-Stepping Control of Flexible Air-Breathing Hypersonic Vehicles with Nonaffine Models

2019 ◽  
Vol 2019 ◽  
pp. 1-19
Author(s):  
Xingge Li ◽  
Gang Li
Keyword(s):  
Control Problem ◽  
Control Strategy ◽  
Hypersonic Vehicle ◽  
Hypersonic Vehicles ◽  
Input Constraints ◽  
Air Breathing ◽  
Fuzzy Approximation ◽  
Low Pass ◽  
Back Stepping Control ◽  
Low Pass Filters

This article investigates a novel fuzzy-approximation-based nonaffine control strategy for a flexible air-breathing hypersonic vehicle (FHV). Firstly, the nonaffine models are decomposed into an altitude subsystem and a velocity subsystem, and the nonaffine dynamics of the subsystems are processed by using low-pass filters. For the unknown functions and uncertainties in each subsystem, fuzzy approximators are used to approximate the total uncertainties, and norm estimation approach is introduced to reduce the computational complexity of the algorithm. Aiming at the saturation problem of actuator, a saturation auxiliary system is designed to transform the original control problem with input constraints into a new control problem without input constraints. Finally, the superiority of the proposed method is verified by simulation.

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