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Fault-tolerant guidance for reentry hypersonic flight vehicles based on NFTET
Received date: 2014-10-24
Revised date: 2015-04-01
Online published: 2015-04-10
Supported by
National Natural Science Foundation of China (61374116); The Fundamental Research Funds for the Central Universities; Foundation of Graduate Innovation Center in NUAA (kfjj201421)
A fault-tolerant guidance law using the neighboring feasible trajectory existence theorem (NFTET) for the three-degree-of-freedom model of a hypersonic vehicle X-33 is designed to solve the problem of trajectory reshaping under actuator failures in reentry phase. In the nominal case, the predictor-corrector guidance algorithm is used to generate the reentry trajectory which meets the requirements of reentry process constraints and terminal constraints. When the actuator failures occur, aerodynamic parameters, structure and the torque of surfaces of flight vehicles may change unpredictably, which makes the nominal trajectory not satisfy the guidance requirements of the reentry process. Therefore, it is necessary to design a new fault-tolerant guidance law. For the reentry guidance model, the fault-tolerant guidance algorithm is designed to reshape the trajectory based on NFTET. Then there is a new feasible trajectory which meets the requirements in the fault case. From the simulation results we can see that the reshaping trajectory generated from the fault-tolerant guidance algorithm is within the constraints of scope, shows a convergent trend and makes the hypersonic flight vehicles recover from failures, improving the autonomic fault-tolerant ability of the vehicles.
QIAN Jiasong , QI Ruiyun . Fault-tolerant guidance for reentry hypersonic flight vehicles based on NFTET[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(10) : 3370 -3381 . DOI: 10.7527/S1000-6893.2015.0092
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