一种用于转子叶片叶尖定时法研究的装置设计及应用

Design and Application of a Device for Study on Rotor Blades Tip-Timing Menthod

中文关键词:  转子叶片  叶尖定时  周向傅里叶拟合  应变片法

英文关键词:rotor blades  tip-timing  circumferential Fourier fit  strain gauge method

中文摘要:

      为了验证叶尖定时技术中的周向傅里叶拟合（Circumferential Fourier Fit,CFF）法所获辨识结果（叶片振动频率和幅值）的准确度，以便于在航空发动机研制过程中将该方法所获测试结果应用于转子叶片动强度安全裕度评估工作中，设计了一种简易的可同时应用应变片法和叶尖定时法进行同步测试的模拟叶轮试验装置，并开展了试验研究。研究结果表明：在辨识叶片共振幅值方面，叶尖定时法和应变片法的差异在±15%之间；在辨识叶片共振频率方面，两者的差异在±1.8%之间；借助有限元分析的手段将叶尖定时法所获测试结果反算为动应力，以此了解叶片在实际工作中的动应力状况。所提方法是一种简便易行的方法，在工程应用方面很有意义。

英文摘要:

      In order to validate the accuracy of the identification results (vibration frequency and amplitude of blades) obtained by the circumferential Fourier fit (CFF) method in the tip-timing technique,so as to apply the test results obtained by this method to evaluate the safety margin of rotor blades dynamic strength,a simple simulated test device with simultaneous strain gauge method and CFF method is designed,and experimental research is conducted.The result of the research shows that in the identification of blade vibrating amplitude,the difference between strain gauge method and CFF method is between ±15%;in the identification of blade vibrating frequency,the difference between strain gauge method and CFF method is between ±1.8%;by means of finite element analysis,the measured results of the tip-timing method are reversely calculated as dynamic stress,well then the dynamic stress of blades in actual work can be understood.The proposed method is simple and easy,which is very meaningful in engineering applications.