航空学报 > 1990, Vol. 11 Issue (11): 630-636

从飞机地面振动试验中识别悬臂舱模态

王凤山   

  1. 飞机结构强度研究所
  • 收稿日期:1989-10-25 修回日期:1990-06-30 出版日期:1990-11-25 发布日期:1990-11-25

IDENTIFICATION OF NACELLE MODES FROM AIRPLANE GVT RESULTS

Wang Fengshan   

  1. Aircraft Structural Strength Research Institute
  • Received:1989-10-25 Revised:1990-06-30 Online:1990-11-25 Published:1990-11-25

摘要: <正> 带有发动机吊舱的机翼颤振临界参数是悬臂在柔性支柱上短舱质量的固有振动模态。以前的做法是认真地设计和分析,以确保满足颤振分析对支柱特殊频率的要求,然后,做悬臂情况下,发动机短舱的振动试验来论证从分析得到的这些参数是否正确。 目前,已经研究出一种分析方法,从修改飞机分析结果去匹配飞机的地面振动试验结果入手来识别这些短舱模态。并已经成功地应用该方法来代替单独的舱/支柱的地面振动试验。

关键词: 模态分析, 模型修改, 模态试验

Abstract: An analytical method, which identifies the nacelle modes from the process of modifying an airplane analysis to match the airplane GVT results has been developed.It is assumed that any analytical errors solely result from the difference between the estimated and actual stiffness of the aircraft structure.

Key words: modal analysis, modul modification, modal test