ESTIMATION OF DYNAMIC CHARACTERISTICS FOR STRUCTURES WITH CLOSELY SPACED EIGENVALUES

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  • 近接固有値を有する構造物の振動特性推定
  • キンセツ コユウチ オ ユウスル コウゾウブツ ノ シンドウ トクセイ スイテイ

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Abstract

The phenomenon of beats has been observed on vibration tests of the hanging type shuctures such as the stress ribbon bridges with very closely spaced natural frequencies. In order to estimate the dynamic characteristics of the structures, the two curve fitting methods which are direct applied to the frequency response and impulse response by the nonlinear least square method are proposed. Effectiveness of the methods are discussed by the numerical simulation and field vibration test for the stress ribbon bridge. Result shows that dynamic characteristics can be estimated highly accurately by the both methods. However, the time domain method have higher accuracy compare with the frequency domain method.

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