公开(公告)号：US20210350040A1

公开(公告)日：2021-11-11

申请号：US17052748

申请日：2020-03-06

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Tinghua YI ,  Mingsheng XUE ,  Chunxu QU ,  Hongnan LI

IPC: G06F30/13 ,  G06F30/20

Abstract: The present invention belongs to the technical field of data analysis for structural testing, and relates to a method of the physical mode exaction for flexibility identification of engineering structures. In the present invention combined deterministic-stochastic subspace identification algorithm is first adopted to calculate basic modal parameters and modal scaling factors from state-space models of different orders. Subsequently, the relative scaling factor difference is added as a new modal indicator to the classic stabilization diagram to better clean out the stabilization diagram. And check the correctness of the selection of the stable axis using single-modal frequency-domain similarity index (SFSI) between single-order FRF and measured FRF. Then, further determine the physical modes from the modes in the stable axis using multi-modal frequency-domain similarity index (MFSI) between lower-order superposition FRF and measured FRF. Finally, calculate flexibility matrix using identified modal parameters and predict the displacement of the structure under static load.