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Influence analysis of hypersonic flight vehicle model uncertainty
Received date: 2014-08-07
Revised date: 2014-09-10
Online published: 2014-09-16
Air-breathing hypersonic flight vehicles are typically characterized by a significant degree of interaction between the highly elastic airframe and the propulsion system. Then it will result in dramatic uncertainty in the model of vehicle. So knowledge of the scale of the uncertainty to the vehicle is necessary during the process of control law design due to the enormous difference between the nominate system and the true system. A coupled longitudinal dynamical model is developed in this paper for a typical hypersonic waverider with parametric uncertainties depicted as add uncertainty model. According to H∞ norm and boundary of the uncertain matrices' maximum singular value, the magnitude of each uncertain factor's influence on the stability of vehicle and the characteristics of the mode is measured. The results indicate that the inertia property has a significant influence on stability and also has dramatic effect on the short-period mode and elastic mode of the vehicle. It is also shown that the flexible degrees of freedom must be considered in the flight-control synthesis for this kind of vehicle.
YU Jia , YANG Pengfei , YAN De . Influence analysis of hypersonic flight vehicle model uncertainty[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(1) : 192 -200 . DOI: 10.7527/S1000-6893.2014.0221
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