Optimization method of arc-shaped tenon structure based on grid parameterization

Abstract

The invention relates to the technical field of aviation, in particular to an arc-shaped tenon structure optimization method based on grid parameterization. The optimization method comprises the following steps: establishing a strength analysis grid model of the arc-shaped tenon structure; creating a control body associated with the strength analysis grid model, wherein the control body can change along with the change of the geometric parameters of the arc-shaped tenon structure; associating grid node coordinates of the strength analysis grid model with the control volume so that the strength analysis grid model can change along with the change of the control volume; and by taking the geometric parameters as design variables and the maximum stress of the arc-shaped tenon structure as an optimization target, optimizing the strength analysis grid model in combination with a test design method and an agent model, so that the maximum stress value in the arc-shaped tenon structure is reduced. According to the optimization method, geometric reproduction and grid re-division in a traditional optimization method are omitted, the quality of the grid newly generated by grid parameterization is equivalent to the quality of the initial grid, the optimization process is simplified, and the credibility of an optimization result is guaranteed.

Description

technical field [0001] The present disclosure relates to the field of aviation technology, and in particular, to an optimization method for an arc tenon structure based on grid parameterization. Background technique [0002] Aero-engine turbine blades are usually connected to the turbine disk using a fir-tree-shaped tenon structure. The traditional fir-tree-shaped tenon structure adopts a plane-plane contact form (ie: the tenon / tenon-groove contact surface is a plane), resulting in a high stress gradient at the contact edge. It is easy to cause crack nucleation and fretting fatigue failure, which will seriously affect the service life of the tenon structure. Aiming at the shortcomings of the plane-plane contact form of the traditional tenon structure, a new arc tenon structure using the surface-curve contact form is developed, which reduces the contact stress and stress gradient, thereby increasing the fretting fatigue life. Therefore, it is of great significance to develop...

AI Technical Summary

Problems solved by technology

[0004] Each iteration needs to update the geometric model and automatically divide the mesh, but the tenon / groove contact analysis has high requirements on the quality of the mesh near the contact surface, and the automatically divided mesh often cannot guarantee the mesh accuracy, which affects the Confidence in optimization results

In addition, the curved tenon structure includes both size variables and shape variables, and the constraint relationship is more complicated. If the geometric model of the curved tenon structure is updated every time, not only the optimization process is complicated and time-consuming, but also the geometric model is regenerated. It is easy to make mistakes and affect the optimization of the curved tenon structure

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