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Structural Engineering and Mechanics
  Volume 34, Number 5, March30 2010, pages 625-634
DOI: http://dx.doi.org/10.12989/sem.2010.34.5.625
 


New accuracy indicator to quantify the true and false modes for eigensystem realization algorithm
Shuqing Wang and Fushun Liu

 
Abstract
    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.
 
Key Words
    modal identification; eigensystem realization algorithm; accuracy indicator; normalized occurrence number.
 
Address
Shuqing Wang: College of Engineering, Ocean University of China, Qingdao 266100, China
Fushun Liu: College of Engineering, Ocean University of China, Qingdao 266100, China
 

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