侯吉林
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第一作者:侯吉林
通讯作者:欧进萍,Jankowski Lukasz
发表时间:2012-01-01
发表刊物:工程力学
所属单位:建设工程学部
卷号:29
期号:9
页面范围:99-105
ISSN号:1000-4750
摘要: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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