航空发动机外部管路的振动特性分析

Analysis of vibration characteristics on aeroengine external pipelines

基于ANSYS Workbench建立了4种典型航空发动机外部管路模型,分析了4种典型管型下卡箍数量、间距、位置对管路系统振动特性的影响,研究了管路内部流体应力对管路系统振动响应的规律。结果表明,对于不同管型的管路,卡箍加载的位置、数量对其固有频率的影响比较大。卡箍的数量越多,间距越近,越靠近管路几何中心,管路系统固有频率越大。管路内部流体应力越大,管路系统的振动响应越大,不同管型下最大共振峰位置不同,振动响应也不同。研究结果为管路设计及管路日常维护提供了一定的依据。

Based on ANSYS Workbench,four typical aeroengine external pipeline models were established.Vibration characteristics of the pipeline system and the influences of the numbers,spacing,positions of clamps and inner fluid stresses of the four typical pipe types were analyzed.The results show that the position and quantity of clamps have a great influence on the natural frequency of pipe systems.The more the numbers of clamps,the closer the spacing and the geometric center of the pipelines,the bigger the natural frequencies are.With increasing of the inner fluid stress,the vibration responses are increasing and the maximum resonance peak position is also changed.The results of this research give a basis for pipelines design and maintenance.