张苏华,李效法,何俊.基于运行模态分析的某民机低频固有特性研究[J].民用飞机设计与研究,2018,(2):111-
基于运行模态分析的某民机低频固有特性研究
Research on Low Frequency Natural Mode for Certain Civil Aircraft Based on Operational Modal Analysis
  
DOI:10.19416/j.cnki.1674-9804.2018.02.021
中文关键词:运行模态分析  民机  低频  模态
英文关键词:operational modal analysis (OMA)  civil aircraft  low frequency  modal
基金项目:
作者单位
张苏华,李效法,何俊 上海飞机设计研究院上海201210 
中文摘要:运行模态分析(Operational Modal Analysis,简称 OMA)是一种基于环境激励的模态参数识别技术,是结构健康监测的重要手段。为了研究某民机在实际运行中的振动特性,在其滑跑过程中,利用加速度传感器采集飞机特定部位的振动响应信号。通过频域空间域分解(Frequency and Spatial Domain Decomposition,简称FSDD)的方法从响应信号中分析得到该民机特定低频模态。根据试验结果对计算模型进行修正,最终通过有限元分析(Finite Element Analysis,简称FEA)计算获得其全部低频模态。实践表明,将运行模态分析与有限元分析相结合,共同获取飞机在特定情况下的动力学特性的方法是可行的。
英文摘要:Operational Modal Analysis (OMA) is a kind of modal parameters identification method based on environmental excitation sources. It is an important measure of vibration based structural health monitoring. To research certain civil aircrafte’s modal parameters in operation, the vibration responses were gathered by the accelerators on specified structural locations during its taxiing. By using the Frequency and Spatial Domain Decomposition (FSDD) technique, some specific low frequency modal parameters were identified. Then the analytical model were revised based on the OMA results, and all the low frequency modal parameters were computed. Practice indicates that analyzing the aircrafte’s dynamical characteristics under specific conditions by OMA based on FEM method is feasible.
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