环境激励下船体模态参数识别实验研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (8) : 57-61.

论文

环境激励下船体模态参数识别实验研究

万岭，洪明

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modal parameters identification of a ship structure under ambient excitation

Wan Ling; Hong Ming

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摘要

运行模态识别是一种仅仅根据环境激励下的结构振动响应来提取结构模态参数的方法，常基于环境激励为白噪声特征的情况。由于船舶螺旋桨、主机及其它激励的特点，船体结构响应在频率上既有较强的单频成分，低频段也存在非常丰富的相对较弱的成分。因此航行中的船舶所受激励呈现为白噪声和确定若干单频频率的叠加作用。本文基于船舶结构的环境激励特点，讨论了船舶结构运行模态参数识别方法，进一步讨论了NExT/ERA方法在船体结构总体模态识别中的应用，通过一艘实船模态实验识别了船体模型的总体模态参数。

Abstract

Operational modal identification methods are procedures that abstract modal parameters of structures only from the response, which are always based on the assumption that the excitations are white noise. For ship structures, the excitations are very complex, which include sea waves, main engine and propeller excitation and so on. These excitations can be assumed to be the combination of white noise and some harmonic signals. In this paper, based on the characteristics of the ambient excitations of ship structures, special methods for operational modal parameters identification are discussed, and then the application of NExT/ERA for ship structures is introduced. At last, these methods are verified through the general modal parameters identification of a real ship structure.

导出引用

万岭;洪明. 环境激励下船体模态参数识别实验研究[J]. 振动与冲击, 2012, 31(8): 57-61

Wan Ling;Hong Ming . modal parameters identification of a ship structure under ambient excitation[J]. Journal of Vibration and Shock, 2012, 31(8): 57-61