Method for designing large-span open-section cabin space truss structure

Abstract

The invention belongs to the field of space truss structure arrangement and design of aviation large-span open-section cabin structures under the action of end face torque loads, and particularly relates to an arrangement and optimization design method of a space truss structure during end face torque load transmission. The method comprises the following steps: firstly, designing a force transmission path for the structure on the basis of theoretical analysis; then establishing a finite element model of the space truss structure, and applying load and displacement boundary conditions; secondly, taking the minimum weight as an optimization target, giving constraint conditions of stress strain and displacement, and achieving redistribution of loads by changing the rigidity of spring elements; and performing multiple rounds of iterative optimization on the space truss structure to obtain a final optimization result.

Description

technical field [0001] The invention belongs to the field of arrangement and design of a space truss structure under the action of an end face torque load of an aviation large-span open-section cabin structure, and in particular relates to an arrangement and an optimal design method of a space truss structure when transmitting end face torque loads. Background technique [0002] Large-span open-section cabin structures are widely used in aircraft, and due to the complexity of the aircraft's stress environment, open-section cabin structures often bear torque loads. However, compared with the closed-section structure, the open-section structure usually has weaker torsional stiffness, and the ability to bear torque load is very weak. When the structure is subjected to torque load, it is easy to produce large deformation and then fail. [0003] At present, the large-span open-section cabin often uses a beam + reinforced frame structure or a plate rod structure, but these configu...

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Problems solved by technology

However, compared with the closed-section structure, the open-section structure usually has weaker torsional stiffness, and the ability to withstand torque load is very weak. When the structure is subjected to torque load, it is easy to produce large deformation and then damage

[0003] At present, the large-span open-section cabin often uses beam + reinforced frame structure or plate rod structure, but these configurations often have complicated force transmission paths and connection forms, and will bring a large weight cost

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