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Operating Modal Parameters Extraction Using Cross-correlation Complex Exponential Method(PDF)

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2002年02期
Page:
113-116
Research Field:
Publishing date:
2002-04-30

Info

Title:
Operating Modal Parameters Extraction Using Cross-correlation Complex Exponential Method
Author(s):
ZhengMin ShenFan ① ChenTonggang
School of Mechanical Engineering,NUST,Nanjing 210094)
Keywords:
cross-correlat ion funct ions complex ex ponent ial method modal analysis operating conditions
PACS:
O235
DOI:
-
Abstract:
A modal parameter ext ract ion scheme in operating condit ions polyreference cross-correlation complex exponent ial method is presented in this paper. It is based on the theory of cross- correlat ion funct ions by t reat ing the cross-correlat ion funct ions betw een outputs instead of impulse response function in the t radit ional complex exponential method. An ex per-i ment on an aircraft model is performed to verify the proposed technique. T he result s from this method give a good agreement w ith those from the pure mode method. It approves that the proposed method can be used to ex tract modal parameters of the operat ing st ructures from response- only.

References:

1  Coo per J E, Desforges M J, Wrig ht J R. Modal parameter identification using an unknow n coloured r andom input. Mechanical Systems and Signal Processing, 1995, 9( 6) : 685~ 695
2  Luz E,Wallaschek J. Ex periment modal analysis using ambient v ibration. The International Journal of Analytical and Ex perimental Modal Analysis, 1992, 7( 1) : 29~ 39

Memo

Memo:
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Last Update: 2002-04-30