Abstract: A pulse excitation method and the test equipment for modal test were introduced.An experiment modal analysis of the front bearing’s spring support of engine was completed.The results will be delivered to the design department of the engine structure,and will be helpful for vibration analysis of the turbojet engine

Key words: Turbojet engine;Bearing structure;Elastic vibration;Modal analysis;Modal vibration test

摘要： 用脉冲激励法对某发动机前轴承弹性支承进行了试验模态分析，并介绍了试验模态分析的方法和试验设备。所得模态分析结果表明，相干函数值均大于０．９，弹性支承的固有频率、振型符合发动机结构设计要求

关键词: 涡轮喷气发动机;支承结构;弹性振动;模态分析;模态振动试验