中国机械工程 ›› 2025, Vol. 36 ›› Issue (9): 1916-1924.DOI: 10.3969/j.issn.1004-132X.2025.09.002

• 机械基础工程 • 上一篇    

航空燃油管路焊缝分区域建模及其对管路力学特性影响研究

郭长虹1(), 狄梦然1, 宫瀚文1, 权凌霄1,2(), 李斌1,2   

  1. 1.燕山大学机械工程学院, 秦皇岛, 066004
    2.河北省重型机械流体动力传输与控制实验室, 秦皇岛, 066004
  • 收稿日期:2024-07-28 出版日期:2025-09-25 发布日期:2025-10-15
  • 通讯作者: 权凌霄
  • 作者简介:郭长虹,女,1977年生,博士研究生。研究方向为材料学、流体传动控制。E-mail:guochanghong@ysu.edu.cn
    权凌霄*(通信作者),男,1977年生,教授、博士研究生导师。研究方向为飞机管路系统动力学分析。E-mail:lingxiao@ysu.edu.cn
  • 基金资助:
    国家自然科学基金(51775477)

Modeling of Aviation Fuel Pipe Welds in Different Regions and Its Effect on Mechanics Properties of Pipes

Changhong GUO1(), Mengran DI1, Hanwen GONG1, Lingxiao QUAN1,2(), Bin LI1,2   

  1. 1.School of Mechanical Engineering,Yanshan University,Qinhuangdao,Hebei,066004
    2.Hebei Province Laboratory of Heavy Machinery Fluid Power Transmission and Control,Qinhuangdao,Hebei,066004
  • Received:2024-07-28 Online:2025-09-25 Published:2025-10-15
  • Contact: Lingxiao QUAN

摘要:

飞机燃油管路包含弯管、分支管和焊缝等多种结构,在外部载荷及内部流体耦合作用下表现出复杂的流固耦合力学行为。通过金相检测和微拉伸试验获取了焊接区域的微观结构参数,构建出具有不同局部结构的高精度燃油焊接管路有限元模型。模态试验结果表明,试验与仿真误差小于10%,验证了建模和仿真的准确性。针对不同分支管弯曲半径及不同管径比开展其对管路力学特性影响研究,发现增大弯曲半径和管径比有助于使管路内流速场和压力场分布更加均匀,固有频率会随弯曲半径的增大而降低;当弯曲半径减小但管径比增大时,随机振动应力峰值下降。采用对焊缝精确建模的燃油管路模型,剖析局部结构对管路力学特性的影响,可为管路设计和优化提供依据。

关键词: 相贯焊接燃油管路, 精细化建模, 局部结构, 流固耦合振动, 力学特性, 模态试验

Abstract:

Aircraft fuel lines contained various structures such as bends, branches and welded seams, which exhibiedted complex fluid-solid coupling mechanics behaviors under external loads and internal fluid coupling. The microstructural parameters of the welded areas were obtained through metallographic testing and microtensile testing, and a high-precision finite element model of the welded fuel lines with different local structures was constructed. The modal test results show that the errors between tests and simulations are less than 10%, which verify the accuracy of modelling and simulation. The effects of different branch pipe bending radii and pipe diameter ratios on the mechanics properties of the pipelines were investigated. It is found that increasing the bending radii and pipe diameter ratios may help to make the distribution of the flow velocity and pressure fields in the pipelines more uniform, and the intrinsic frequency decreases with the increase of the bending radius; and when the bending radius decreases but the pipe diameter ratio increases, the peak of the random vibratory stresses decreases. The applications of a fuel line model that accurately models welded seams to analyze the effect of local structures on the mechanics properties of the line may provide a basis for line design and optimization.

Key words: coherently welded fuel line, refined modeling, local structure, fluid-solid coupling vibration, mechanics property, modal test

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