A reliability design method of turbine blisk structure strength

Abstract

The invention relates to a design method of the strength reliability of a turbine leaf disc structure. The design method comprises the following steps: determining an initial scheme of the turbine leaf disc structure, determining the geometrical shape of the structure, and calculating weight; obtaining the deterministic load of the structure, carrying out detailed three-dimensional stress / strain analysis, taking a deterministic design criterion as an optimization constraint condition, and returning to design support if the optimization constraint condition does not meet criteria requirements; analyzing random factors affect the turbine leaf disc structure, and the distribution characteristics of the random factors, determining a checking position which is liable to lose efficiency, calculating to obtain the strength reliability of the checking position, combining with a strength probability criteria to evaluate a strength reliability analysis result, and returning to the design support if the strength reliability result does not meet the criteria requirements; carrying out combined risk evaluation on the risk level of the maximum stress of each checking position, and calculating the integral efficiency losing probability of the turbine leaf disc structure; judging whether the integral efficiency losing probability of the turbine leaf disc structure meets the requirements of each technical index or not, transferring into the design support if the turbine leaf disc structure does not meet the requirements of each technical index, and revising dimensions or materials; and circularly executing the whole process until the integral efficiency losing probability of the turbine leaf disc structure meets the requirements of each technical index.

Description

technical field [0001] The invention relates to a reliability design method for the structural strength of an aeroengine turbine blisk, which is a design method capable of considering the dispersion of factors such as materials and geometry, and belongs to the technical field of aerospace engines. Background technique [0002] Aeroengine is an extreme product, working under complex loads / environments such as high temperature, high pressure, and high speed; the improvement of engine performance and safety indicators requires the engine to be light in weight, long in life, and high in reliability (for example, for safe flight Engine structural parts require a low probability of failure, up to 10 -5 -10 -7 times / flight hour). At present, the structure of active and in-service engines is heavy (performance is not enough) and reliability is not guaranteed. The reason is that in the design process, some parts of the structure are conservatively designed, which will lead to dang...

AI Technical Summary

Problems solved by technology

[0004] At present, the traditional design method of turbine blisk structure is mainly based on deterministic design, combined with some experimental content, it is difficult to accurately give the actual strength of the structure and quantify the failure risk of the structure

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