Partitioned Time-Domain Substructure Coupling Methodology for Efficient Hypersonic Vehicle Simulation

In this article, an adaptive fault tolerant control strategy is proposed to solve the trajectory tracking problem of a generic hypersonic vehicle subjected to actuator fault, external disturbance, and input saturation. The longitudinal model of generic hypersonic vehicle is divided into velocity subsystem and altitude subsystem, in which dynamic inversion and backstepping are applied, respectively, to track the desired trajectories. For the unknown maximum disturbance upper bound, actuator fault, and input saturation constraint, adaptive laws are proposed to estimate these information online. Finally, numeric simulation is conducted in the cruise phase for generic hypersonic vehicle. Simulation results show that the controllers designed in this article can make generic hypersonic vehicle track the desired trajectories in the presence of actuator fault, external disturbance, and input saturation.

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

Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering ◽

10.1177/0954410019836902 ◽

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.

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