波阵风中的弹性飞机动力学建模与仿真

doi:10.7527/S1000-6893.2022.28214

Abstract

Abstract: The blast wind generated by the explosion propagates at supersonic or sonic speeds and carries high-energy disturbance energy, which can have a significant disturbance or even destructive effect on the aircraft. The model of the blast wind is described, and the method of action between the blast wind and the aircraft is defined. The effect of blast wind on aircraft was treated as the downwash effect, and the unsteady excitation force calculation formula for aircraft in the blast wind was derived by employing the subsonic doublet lattice method, based on which the dynamics model of elastic aircraft in the blast wind was established, and the dynamic response simulation process for flexible aircraft in the blast wind was proposed. The numerical simulation results show that the calculation method of the excitation force due to the blast wind is effective and can meet the requirements of engineering practice. At the center of gravity, the dynamic response results of elastic aircraft and rigid aircraft are similar and have no obvious difference. In the wingtip region, the dynamic response results of elastic aircraft and rigid body aircraft show significant difference due to the aeroelastic effect. Since the excitation energy of the blast wind is mainly concentrated below 1Hz, the elastic modes with relatively high vibration frequencies can be ignored when establishing dynamics models of the elastic aircraft.

Key words: blast wind, flexible aircraft, unsteady aerodynamics, rational aerodynamic approximation, dynamic response

CLC Number:

V215.3

Li-Bo WANG Zhi-Wei JING. Modelling and simulation for the flexible aircraft in the blast wind[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, doi: 10.7527/S1000-6893.2022.28214.

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Modelling and simulation for the flexible aircraft in the blast wind

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