Method for calculating large deformation strength of tube spring type undercarriage

Abstract

The invention discloses a method for calculating the large deformation strength of a tube spring type undercarriage. The method comprises the following steps of 1, calculating the internal force of the tube spring type undercarriage; 2, calculating the tensile stress sigma limit of the key section of the undercarriage under the limited load condition, and comparing the tensile stress sigma limit with the tensile yield limit sigma 0.2 of the material; 3, calculating the tensile stress sigma limit of the key section of the undercarriage under the limit load condition, and carrying out plastic correction on the tensile stress sigma limit; 4, calculating the maximum shear stress tau limit of the key section of the undercarriage under the limit load condition, and comparing the maximum shear stress tau limit with the material shear strength limit tau b; 5, calculating a composite stress sigma he, and comparing the composite stress sigma he with the tensile strength limit sigma b of the material; 6, judging whether the safety margins of the sigma he limit and the tau limit are both smaller than 0.1 or not. According to the method, the technical problem of calculation of the strength of the light universal aircraft tube spring type undercarriage is solved, and the coordinated design of the buffering performance and the strength of the tube spring type undercarriage can be achieved.

Description

technical field [0001] The invention belongs to the technical field of strength design of aircraft landing gear, and in particular relates to a method for calculating the large deformation strength of a tube-spring type landing gear. Background technique [0002] General aviation is characterized by flexibility, speed and efficiency. It requires aircraft to have low production and use costs, simple field flight support, and easy maintenance and replacement of parts. The landing gear of traditional aircraft requires corresponding hydraulic retractable control system, oil buffer, complex system, high probability of failure such as oil leakage, difficult field maintenance, and high purchase and use costs. Therefore, fixed tube spring landing gear has become the preferred choice for general-purpose aircraft Main landing gear form. [0003] Due to policy restrictions in China, there has been a long-term lack of demand for the development of light general-purpose aircraft. Genera...

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Problems solved by technology

[0005] The purpose of the present invention: to propose a method for calculating the large deformation strength of the tube spring landing gear, to solve the technical problem of the calculation of the strength of the tube spring landing gear of light general aircraft

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