Reliability robust design method for multi-failure mode of superdeep well lifting container

Abstract

The invention discloses a reliability robust design method for a multi-failure mode of a superdeep well lifting container. The method includes the following steps of (1) determining structural parameters, material properties and dynamic load randomness of the lifting container, and adopting an experiment design method for figuring out a random response to a structure failure under random parameters; (2) according to a failure criterion of the lifting container, creating a reliability performance function under each failure mode; (3) taking the probability correlation among the failure modes into account, and adopting a copula theory for creating a combined probability model of correlative failures; (4) creating a system reliability model correlative with failures of the lifting container under the combination of the combined probability model; (5) creating a sensitivity model of the system reliability of the lifting container for each random parameter; (6) under the combination of an optimization design model, creating a lifting container reliability robust optimization design model with the combined failure probability and parameter sensitivity as constrains.

Description

technical field [0001] The invention relates to a robust design method for system reliability of mechanical products aimed at hoisting containers in ultra-deep wells and considering failure mode probability correlation, and belongs to the field of mechanical structure reliability technology research. Background technique [0002] At present, most of the coal wells in my country are shallow wells, 500-800m deep to the ground, and coal resources buried at a depth of 1000-2000m account for about 53% of the total reserves, and a kilometer-deep well hoisting system must be used (including hoists, hoisting containers, lifting wire rope, etc.). The lifting container is responsible for loading and unloading the mined coal resources, and it bears a large vertical load during the lifting and lowering process. Due to the complex environment of the underground lifting, the lifting container has various failure modes under the action of dynamic load. Considering the uncertainty of the li...

AI Technical Summary

Problems solved by technology

Therefore, defining the reliability of the lifting vessel only from a single failure mode will reduce the accuracy of the reliability evaluation of the lifting vessel, resulting in a large deviation in design and later maintenance

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