航空发动机转子叶片三维有限元振动特性分析

叶片是航空发动机的主要零件之一,结构及承载情况十分复杂。在实际使用中,由于叶片的振动破坏而造成发动机失效甚至飞机失事的例子时有发生。因此,对叶片的振动特性分析就显得尤为重要。根据叶片的实体结构建立了叶片的三维有限元模型,编制了叶片振动特性分析的有限元程序(Fortran语言,约8000余句)。采用子空间迭代法计算叶片的频率。利用开发的软件对影响压气机叶片振动特性的几个因素进行了分析。经算例考核证明,计算模型和程序是正确的、有效的,具有较高的计算精度。为转子叶片的疲劳损伤及可靠性分析,提供了一个有效的、灵活的研究手段,具有应用价值。

Analysis of 3D Vibration Characteristics for Rotor Blades of Aero-Engine by the Finite Element Method

The blade is one of the major parts of the Aero-engine.Because of the complicity of structure bearing force,in engineering application,the examples of engine invalid and even wrecked are common.So,a 3D analysis system of the vibration character of the rotor blades of Aero-engine must be paid attention.In this paper,the 3D analysis model of blade was described using 20 nodes three-dimensional element.The finite element procedure was worked out using the blade vibration characteristic analysis of the Aero-engine.The blade's static and dynamic frequency was calculated with sub-space method.Finally,through the software,the analysis and discusses which influenced the blade vibration characteristic of the Aero-engine were given.This program has offered an effective,flexible research means for rotor blades of Aero-engine fatigue damage and dependability.