Defect identification under uncertain blast loading

Hasan Katkhuda, Achintya Haldar

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A novel finite element-based system identification procedure is proposed to detect defects in existing frame structures when excited by blast loadings. The procedure is a linear time-domain system identification technique where the structure is represented by finite elements and the input excitation is not required to identify the structure. It identifies stiffness parameter (EI/L) of all the elements and tracks the changes in them to locate the defect spots. The similar procedure can also be used to monitor health of structures just after natural events like strong earthquakes and high winds. With the help of several numerical examples, it is shown that the algorithm can identify defect-free and defective structures even in the presence of noise in the output response information. The accuracy of the method is much better than other methods currently available even when input excitation information was used for identification purpose. The method not only detects defective elements but also locate the defect spot more accurately within the defective element. The structures can be excited by single or multiple blast loadings and the defect can be relatively small and large. With the help of several examples, it is established that the proposed method can be used as a nondestructive defect evaluation procedure for the health assessment of existing structures.

Original languageEnglish (US)
Pages (from-to)277-296
Number of pages20
JournalOptimization and Engineering
Volume7
Issue number3
DOIs
StatePublished - Sep 2006

Fingerprint

Blast
Defects
System Identification
Identification (control systems)
Health
Excitation
Finite Element
Frame Structure
Earthquake
Linear Time
Time Domain
Stiffness
Earthquakes
Monitor
Numerical Examples
Output
Evaluation

Keywords

  • Finite element
  • Health assessment
  • System identification and unknown blast excitation

ASJC Scopus subject areas

  • Management Science and Operations Research
  • Engineering (miscellaneous)

Cite this

Defect identification under uncertain blast loading. / Katkhuda, Hasan; Haldar, Achintya.

In: Optimization and Engineering, Vol. 7, No. 3, 09.2006, p. 277-296.

Research output: Contribution to journalArticle

@article{042c14f09abc4e379c1eeae07f65109d,
title = "Defect identification under uncertain blast loading",
abstract = "A novel finite element-based system identification procedure is proposed to detect defects in existing frame structures when excited by blast loadings. The procedure is a linear time-domain system identification technique where the structure is represented by finite elements and the input excitation is not required to identify the structure. It identifies stiffness parameter (EI/L) of all the elements and tracks the changes in them to locate the defect spots. The similar procedure can also be used to monitor health of structures just after natural events like strong earthquakes and high winds. With the help of several numerical examples, it is shown that the algorithm can identify defect-free and defective structures even in the presence of noise in the output response information. The accuracy of the method is much better than other methods currently available even when input excitation information was used for identification purpose. The method not only detects defective elements but also locate the defect spot more accurately within the defective element. The structures can be excited by single or multiple blast loadings and the defect can be relatively small and large. With the help of several examples, it is established that the proposed method can be used as a nondestructive defect evaluation procedure for the health assessment of existing structures.",
keywords = "Finite element, Health assessment, System identification and unknown blast excitation",
author = "Hasan Katkhuda and Achintya Haldar",
year = "2006",
month = "9",
doi = "10.1007/s11081-006-9972-9",
language = "English (US)",
volume = "7",
pages = "277--296",
journal = "Optimization and Engineering",
issn = "1389-4420",
publisher = "Springer Netherlands",
number = "3",

}

TY - JOUR

T1 - Defect identification under uncertain blast loading

AU - Katkhuda, Hasan

AU - Haldar, Achintya

PY - 2006/9

Y1 - 2006/9

N2 - A novel finite element-based system identification procedure is proposed to detect defects in existing frame structures when excited by blast loadings. The procedure is a linear time-domain system identification technique where the structure is represented by finite elements and the input excitation is not required to identify the structure. It identifies stiffness parameter (EI/L) of all the elements and tracks the changes in them to locate the defect spots. The similar procedure can also be used to monitor health of structures just after natural events like strong earthquakes and high winds. With the help of several numerical examples, it is shown that the algorithm can identify defect-free and defective structures even in the presence of noise in the output response information. The accuracy of the method is much better than other methods currently available even when input excitation information was used for identification purpose. The method not only detects defective elements but also locate the defect spot more accurately within the defective element. The structures can be excited by single or multiple blast loadings and the defect can be relatively small and large. With the help of several examples, it is established that the proposed method can be used as a nondestructive defect evaluation procedure for the health assessment of existing structures.

AB - A novel finite element-based system identification procedure is proposed to detect defects in existing frame structures when excited by blast loadings. The procedure is a linear time-domain system identification technique where the structure is represented by finite elements and the input excitation is not required to identify the structure. It identifies stiffness parameter (EI/L) of all the elements and tracks the changes in them to locate the defect spots. The similar procedure can also be used to monitor health of structures just after natural events like strong earthquakes and high winds. With the help of several numerical examples, it is shown that the algorithm can identify defect-free and defective structures even in the presence of noise in the output response information. The accuracy of the method is much better than other methods currently available even when input excitation information was used for identification purpose. The method not only detects defective elements but also locate the defect spot more accurately within the defective element. The structures can be excited by single or multiple blast loadings and the defect can be relatively small and large. With the help of several examples, it is established that the proposed method can be used as a nondestructive defect evaluation procedure for the health assessment of existing structures.

KW - Finite element

KW - Health assessment

KW - System identification and unknown blast excitation

UR - http://www.scopus.com/inward/record.url?scp=33749505523&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33749505523&partnerID=8YFLogxK

U2 - 10.1007/s11081-006-9972-9

DO - 10.1007/s11081-006-9972-9

M3 - Article

AN - SCOPUS:33749505523

VL - 7

SP - 277

EP - 296

JO - Optimization and Engineering

JF - Optimization and Engineering

SN - 1389-4420

IS - 3

ER -