Abstract: The experiment modal analysis of the middle casing of the turbojet engine was completed .The prototype parts and none prototype parts were compared through the vibration modal analysis test. The results are helpful for the vibration fault analysis and structure design of the turbojet engine.

Key words: Turbojet engine;Middle casing;Modal analysis;Modal vibration test

摘要： 用多点激振单点拾振的脉冲激励试验模态测试方法 ,对某涡喷发动机中介机匣的振动特性进行了模态分析 ,对比了模型机中介机匣与改型机中介机匣的振动模态 ,试验结果表明模型机中介机匣在结构设计方面存在薄弱环节 ,其结果为某涡喷发动机结构设计、振动故障分析提供了依据。

关键词: 涡轮喷气发动机;中介机匣;模态分析;模态振动试验