New accuracy indicator to quantify the true and false modes for eigensystem realization algorithm

作者：Wang Shuqing^*; Liu Fushun

来源：Structural Engineering and Mechanics, 2010, 34(5): 625-634.

• modal identification
• eigensystem realization algorithm
• accuracy indicator
• normalized occurrence number

The objective of this paper is to apply a new proposed accuracy indicator to quantify the true and false modes for Eigensystem Realization Algorithm using output-based responses. First, a discrete mass-spring system and a simply supported continuous beam were modelled using finite element method. Then responses are simulated under random excitation. Natural Excitation Technique using only response measurements is applied to compute the impulse responses. Eigensystem Realization Algorithm is employed to identify the modal parameters on the simulated responses. A new accuracy indicator, Normalized Occurrence Number-NON, is developed to quantitatively partition the realized modes into true and false modes so that the false portions can be disregarded. Numerical simulation demonstrates that the new accuracy indicator can determine the true system modes accurately.

• 出版日期2010-3-30
• 单位中国海洋大学