%A Libo WANG, Zhiwei JING, Chu TANG %T Modelling and simulation of flexible aircraft in blast wind %0 Journal Article %D 2023 %J Acta Aeronautica et Astronautica Sinica %R 10.7527/S1000-6893.2022.28214 %P 228214-228214 %V 44 %N 17 %U {https://hkxb.buaa.edu.cn/CN/abstract/article_19442.shtml} %8 2023-09-15 %X

The blast wind generated by the explosion propagates at supersonic or sonic speed and carries high-energy disturbance energy, and 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 is treated as the downwash effect, and the unsteady excitation force calculation formula for aircraft in the blast wind is derived by employing the subsonic doublet lattice method. A dynamics model of elastic aircraft in the blast wind is established, and the dynamic response simulation process for flexible aircraft in the blast wind is 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 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 1 Hz, the elastic modes with relatively high vibration frequencies can be ignored in establishing dynamics model of the elastic aircraft.