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Date of Publication:2012-01-01

Journal:工程力学

Affiliation of Author(s):建设工程学部

Volume:29

Issue:9

Page Number:99-105

ISSN No.:1000-4750

Abstract:For huge complex structures, it is difficult to obtain enough
   information which is required necessarily in their global monitoring.
   Aiming at this problem, a Local Primary Frequency (LPF) method is
   proposed for a local damage identification using only a local measured
   response, which is easy to be performed in a real application. LPF
   belongs to the frequencies of a global structure, but the distortion of
   the corresponding mode mainly concentrates on a substructure under the
   local excitation and the subculture vibrates mainly in the form of this
   mode. In this way, the corresponding frequency is defined as the LPF of
   the substructure or it is said that the substructure has its LPF.
   Therefore LPF reflects more characteristics of the substructure and is
   sensitive to the local substructure damage, and hence only a Local
   Primary Frequency is enough to identify the substructure damage. However
   generally substructures don't own their LPFs. Locating additional mass
   on the substructure is proposed as an efficient method to make the
   substructure have LPF. An experiment of a big space truss is used to
   verify the proposed method. Both the damage location and damage extent
   are identified accurately via the substructure LPF.

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