基于拓扑优化的航空发动机滑油箱支架设计

Design of Bracket of Oil Tank Assembly in Aero-Engine Based on Topology Optimization

关键词:  滑油箱支架  拓扑优化  局部刚度  相对位移  灵敏度分析

Key words:  Bracket of oil tank assembly  Topology optimization  Local stiffness  Relative displacement  Sensitivity analysis

摘要:

支架是航空发动机滑油箱组件中的重要部件，用于连接和固定滑油箱组件中的箍带。但现有支架设计会引起与之相连的箍带承受偏心拉力，导致结构应力水平偏高进而发生疲劳破坏。本文提出了一种考虑结构局部刚度的拓扑优化方法，能够在提升支架整体刚度的同时兼顾局部刚度，使支架的刚度分布更加合理，进而显著降低与之相连的箍带的应力水平。利用该优化方法优化后的支架结构质量与初始结构相同，最大形变量降低了17.7%，与之相连的箍带结构不再受偏心拉力，应力分布更为均匀，最大应力降低了30.84%，验证了考虑结构局部刚度的拓扑优化方法在支架结构设计中的有效性。

Abstract:

The bracket is an important part of the oil tank assembly in aero engine，which is used to connect and fix the band in the oil tank assembly. However， the existing bracket design will cause eccentric tension on the band connected to the bracket. This will lead to a high level of structure stress and fatigue damage. A topology optimization method considering the local stiffness of the structure is proposed， which improved the overall stiffness of the support while taking into account the local stiffness. Through this method， the stiffness distribution of the bracket become more reasonable， thereby the stress level of the band connected to it is reduced. The weight of the bracket designed by this topology optimization method is the same as the original structure， the maximum deformation is reduced by 17.7%. The band connected to the bracket is no longer subjected to eccentric tension， the stress distribution is more uniform， and the maximum stress is reduced by 30.84%. The effectiveness of the topology optimization method considering the local stiffness in the design of the bracket is verified.