Determination method of cargo compartment floor load during cargo airdrop of transport aircraft

Abstract

The invention belongs to the technical field of aircraft flying load design, and relates to the improvement on a method for determining a goods cabin floor load when a transportation aircraft drops goods. The method for determining the goods cabin floor load is characterized by comprising the step of initializing aircraft air-dropping goods parameters, the step of analyzing aircraft limited element modals, the step of carrying out aircraft non-steady aerodynamic calculation, the step of calculating an aircraft air-dropping goods dynamic response, the step of calculating a goods cabin floor structure load dynamic response and the step of determining the design load of a goods cabin floor in the process of air-dropping. By means of the improved method for determining the goods cabin floor load when the transportation aircraft drops the goods, the determining precision of the goods cabin floor load is improved, and the structural safety of the goods cabin floor and the flying safety of the aircraft are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of aircraft flight load design, and relates to the improvement of a method for determining the floor load of a cargo compartment during airdropping of transport aircraft cargo. Background technique [0002] Airdrop is one of the important working modes of transport aircraft. During airdrop, it is generally necessary to determine the design loads of the aircraft cargo floor, cargo bridge, connectors, wings and other components. The current transport aircraft regards the aircraft as a rigid body when airdropping cargo, and only considers the static aeroelastic correction of the aerodynamic force, and relies on the rigid body flight dynamics equation to solve the problem. For specific techniques, see the literature: "Flight Dynamics Modeling and Simulation of Transport Airdrops" , Yang Miaosheng, Qu Xiangju, "Flight Mechanics", 2010, Vol. 28 (No. 3), P.9-12. [0003] The disadvantages of the method for determ...

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Problems solved by technology

[0003] The disadvantages of the current method for determining the floor load of the cargo hold during the airdrop of transport aircraft cargo are: first, the determined load floor load has a large error

Due to the characteristics of large structural flexibility and low frequency of transport aircraft, the excitation load in the process of cargo airdrop, especially heavy cargo airdrop, has a wide frequency band, which will excite more elastic mode vibrations of the aircraft, and this dynamic response It may be made larger by the aeroelastic effect, which will cause an increase in the structural load of the aircraft, which will have an adverse effect on the structural safety and flight safety of the aircraft

Second, in the process of modeling the dynamic response of elastic aircraft cargo airdrops, the movement process in the cargo compartment was not considered, and the discrete gust excitation load was not superimposed during the airdrop process. It will cause the design load of the cargo compartment floor to be too small when the aircraft cargo is air-dropped, which will adversely affect the structural safety and flight safety of the aircraft.

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