Method for calculating static strength of cabin door structure

Abstract

The invention relates to a method for calculating the static strength of a cabin door structure and belongs to the field of airplane structures strength design. Static strength calculation is performed based on a linear contact analysis method, and a finite element model of the cabin door structure is firstly established; according to the cooperative relation of the cabin door structure and an airplane body structure, boundary conditions are determined; then, the loading conditions applicable to constraint conditions of the cabin door structure are determined according to the boundary conditions, finally constraint of a linear contact analysis model is performed, a constraint control file is established, and finally the result of linear contact constraint reaction is calculated. By comparing a calculation result of linear contact analysis with a calculation result of nonlinear contact analysis, the static strength of the cabin door structure can be more conveniently, quickly and accurately calculated through linear contact analysis.

Description

technical field [0001] The invention belongs to the field of aircraft structural strength design, in particular to a method for calculating the static strength of a cabin door structure. Background technique [0002] The door structure is a special moving part on the aircraft. For an airtight door, it mainly bears positive and negative pressure differential loads, aerodynamic loads, and inertial loads. Since the hatch has a lot of contact with the fuselage, it is required to determine the boundary constraint conditions of the hatch according to the load conditions during the strength calculation of the hatch structure. In the case of pressurization, it mainly bears the airtight load, which is transmitted to the fuselage structure by the fixed stop joint; in the case of non-pressurization, it mainly bears the inertial load, which is transmitted to the fuselage structure by the hatch latch, guide groove, etc. . [0003] For the hatch structure, on the one hand, different loa...

AI Technical Summary

Problems solved by technology

[0003] For the hatch structure, on the one hand, different load cases have different load transfer paths. If linear static calculations are used, separate constraint conditions need to be defined for each load case. The workload is large, and it is difficult to simulate real contact situation; on the other hand, since the hatch is a statically indeterminate structure with multi-point contact, it is difficult to obtain accurate results by using engineering methods

[0004] Although the gap element can be used to solve the contact problem in engineering, the gap element needs to use a nonlinear solution sequence, and the stiffness of the gap element needs to be estimated at the same time, resulting in a long time-consuming, especially for the calculation of various working conditions, time-consuming Laborious, this method is not advisable at the beginning of the scheme design

Images