科研之友
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摘要
Aiming at the transient dynamic response of drone aircraft cushion landing with airbag, the explicit dynamic calculation method and pressure equalizing airbag model are adopted to analyze the dynamic response of drone aircraft fuselage and wings under impact during cushion landing with airbag, and the attitude and strength characteristics and airbag parameters in the recovery process of drone aircraft are obtained. The effects of airbag cushion parameters (orifice area, initial internal pressure and exhaust threshold) and drone aircraft state on the fuselage of drone aircraft during landing are discussed. The results show that: under the standard conditions, the aircraft's attitude and strength meet the requirements of safe landing after buffering with airbag. Through the analysis of different landing parameters, it is found that the area of the airbag exhaust vent has a great impact on the cushioning effect, while the threshold of the airbag exhaust pressure and the initial internal pressure have little impact on it. The same airbag has high adaptability to different initial landing speeds of drone aircraft. The local stress of the later landing fuselage of the drone aircraft with pitch angle is too large. This method can be widely used in the dynamic calculation of aircraft airbag cushion. Combined with the airbag drop test, the corresponding airbag parameters and fuselage structure response data can be obtained, which provides a basis for the design of target aircraft. ? 2021, Editorial Board of Chinese Journal of High Pressure Physics. All right reserved.
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