Stress Design of High Temperature Pneumatic Duct System of Aircraft Using Finite Element Method

Abstract

Abstract:

Based on analysis of loads, constraints and its mechanisms applied to the air duct system of an anti-ice system, a strength safety design method of the air duct system was proposed, that is,the beam element model was introduced to analyse the air duct system. According to the simulation results, the duct system was compensated by the compensator and constraint devices in order to meet the design demands of stress and displacement. Then shell element model was used to check out the stress. And the process will be repeated again if the three dimensional calculation results surpassed the demands of designed capacity. The results show that the design method mentioned above can be applied to the safety design of the air duct system of aircraft. Meanwhile, the performance of the ball joint and flight state influencing on stress result should be considered in the design process.

Key words: stress compensation, stress analysis, high temperature pneumatic duct, finite element method

摘要：

在详细分析飞机防冰系统空气导管受到的载荷、约束及其对管系作用机制的基础上，提出了一种空气导管强度安全设计方法。采用梁单元模型对管系进行应力和位移分析，并据此通过补偿器和约束装置的添加对管系进行补偿直至管系满足应力和位移设计要求，最后采用壳单元对管系进行应力校核，若应力不满足要求则重复上述步骤。研究结果表明：上述设计方法可有效地完成对飞机空气导管系统的安全设计;同时在导管设计中应充分考虑球形接头补偿特性以及不同的飞行工况对管道应力分析的影响。

关键词: 应力补偿, 应力分析, 高温高压导管, 有限元方法

CLC Number:

V229

Shi Hong, Jiang Yanlong, Liu Juan, Cai Yufei, Liu Chao. Stress Design of High Temperature Pneumatic Duct System of Aircraft Using Finite Element Method[J]. China Mechanical Engineering, 2014, 25(5): 614-618.

施红, 蒋彦龙, 刘娟, 蔡玉飞, 刘超. 基于有限元的飞机空气高温高压导管应力设计[J]. 中国机械工程, 2014, 25(5): 614-618.

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