Undercarriage fatigue stress calculation method, system and equipment and storage medium

The invention discloses an undercarriage fatigue stress calculation method, system and device and a storage medium. The undercarriage fatigue stress calculation method comprises the steps that an undercarriage finite element calculation model and an undercarriage beam model are constructed; constructing an axle center fatigue load spectrum; distributing the axle center fatigue load spectrum into an airplane wheel center load spectrum; the node force of each part of the undercarriage under the axle center fatigue load spectrum is obtained; the undercarriage parts are divided into two types, one type belongs to a two-force rod, and the other type belongs to a local statically indeterminate structure; calculating the stress value of the two-force rod under each fatigue working condition based on the pulling and pressing unit load; and calculating a stress value of the local statically indeterminate structure under each fatigue working condition based on a stress superposition principle. Compared with traditional