Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18860
DC FieldValueLanguage
dc.contributorDepartment of Civil and Environmental Engineering-
dc.creatorZhou, HF-
dc.creatorNi, YQ-
dc.creatorKo, JM-
dc.date.accessioned2015-05-26T08:11:26Z-
dc.date.available2015-05-26T08:11:26Z-
dc.identifier.issn0888-3270-
dc.identifier.urihttp://hdl.handle.net/10397/18860-
dc.language.isoenen_US
dc.publisherAcademic Pressen_US
dc.subjectAlarming thresholden_US
dc.subjectAuto-associative neural networken_US
dc.subjectCable-stayed bridgeen_US
dc.subjectEnvironmental effecten_US
dc.subjectNovelty detectionen_US
dc.subjectStructural damage alarmingen_US
dc.titleStructural damage alarming using auto-associative neural network technique : exploration of environment-tolerant capacity and setup of alarming thresholden_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.spage1508-
dc.identifier.epage1526-
dc.identifier.volume25-
dc.identifier.issue5-
dc.identifier.doi10.1016/j.ymssp.2011.01.005-
dcterms.abstractWith the intention of avoiding false-positive and false-negative alarms in structural damage alarming using the auto-associative neural network (AANN) technique, two issues pertaining to this technique are addressed in this study. The first issue explored is the environment-tolerant capacity of the AANN. Efforts have been made to seek a generalization technique to enhance the environment-tolerant capacity. First, a baseline AANN model is formulated using the conventional training algorithm. Generalization techniques including AIC and FPE, early stopping, and Bayesian regularization are then investigated, resulting in three new AANN models. Their environment-tolerant capacity is evaluated as per their capability to avoid false-positive and false-negative alarms. The other issue addressed is the setup of alarming threshold, with intent to reduce the uncertainty in AANN-based structural damage alarming. A procedure based on the probability analysis of the novelty index is proposed for this purpose. First, the novelty index characterizing the intact structure is analyzed by the KolmogorovSmirnov goodness-of-fit test to obtain its best-fit continuous probability distribution. A confidence interval is then defined in consideration of the compromise between type I and type II errors. The alarming threshold of the novelty index is consequently set at the upper limit of the confidence interval. The above explorations are examined by using the long-term monitoring data on modal properties of the cable-stayed Ting Kau Bridge. The capability to eliminate false-positive alarm is verified by using unseen testing data which were not used in formulating the AANN models, while the capability to alleviate false-negative alarm is examined by using simulated data from the 'damaged' bridge with the help of a precise finite element model. The study indicates that the early stopping technique performs best in improving the environment-tolerant capacity of the AANN, and the alarming threshold set by the proposed procedure helps to reduce the uncertainty in AANN-based structural damage alarming.-
dcterms.bibliographicCitationMechanical systems and signal processing, 2011, v. 25, no. 5, p. 1508-1526-
dcterms.isPartOfMechanical systems and signal processing-
dcterms.issued2011-
dc.identifier.isiWOS:000290550700005-
dc.identifier.scopus2-s2.0-79953891358-
dc.identifier.eissn1096-1216-
dc.identifier.rosgroupidr51021-
dc.description.ros2010-2011 > Academic research: refereed > Publication in refereed journal-
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