Health assessment of beams-experimental verification

P. H. Vo, Achintya Haldar

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A novel nondestructive structural health assessment procedure now under development at the University of Arizona and presented in a companion paper, is experimentally verified. The experimental verifications of the procedure to identify defect-free and defective fixed ended and simply supported beams are presented in this paper. In this approach, acceleration and rotational time histories are measured at pre-selected node points. They are then post-processed to remove several sources of error including noise, high frequency content, slope, and DC bias. The post-processed response information is then successively integrated to obtain the corresponding velocity and displacement time histories. Even when these sources of error were removed from the response information, the proposed method failed to identify the beams. Several factors including noise, data latency, scale factor and cross coupling error were investigated. Amplitude and phase errors in the accelerometer's measurements were found to be the root cause. Alternative approaches are proposed to mitigate them. Following the suggested procedures, defect-free and defective fixed ended and simply supported beams are correctly identified. The proposed NDE procedure is accurate and robust, and can identify defects at the local element level in the context of the finite element representation. The laboratory experiments clearly and conclusively verified the proposed algorithm, i.e. a beam can be identified without using input excitation information and using only noise-contaminated response information and established its application potential.

Original languageEnglish (US)
Pages (from-to)45-56
Number of pages12
JournalStructure and Infrastructure Engineering
Volume4
Issue number1
DOIs
StatePublished - Feb 2008

Fingerprint

Health
defect
Defects
accelerometer
history
Accelerometers
health
Experiments
laboratory experiment
method

Keywords

  • Experimental verification
  • Finite element
  • Health assessment
  • System identification
  • Time domain

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Safety, Risk, Reliability and Quality
  • Building and Construction
  • Mechanical Engineering
  • Ocean Engineering

Cite this

Health assessment of beams-experimental verification. / Vo, P. H.; Haldar, Achintya.

In: Structure and Infrastructure Engineering, Vol. 4, No. 1, 02.2008, p. 45-56.

Research output: Contribution to journalArticle

@article{c7c3a9c3177b47168a923f4073fd82b8,
title = "Health assessment of beams-experimental verification",
abstract = "A novel nondestructive structural health assessment procedure now under development at the University of Arizona and presented in a companion paper, is experimentally verified. The experimental verifications of the procedure to identify defect-free and defective fixed ended and simply supported beams are presented in this paper. In this approach, acceleration and rotational time histories are measured at pre-selected node points. They are then post-processed to remove several sources of error including noise, high frequency content, slope, and DC bias. The post-processed response information is then successively integrated to obtain the corresponding velocity and displacement time histories. Even when these sources of error were removed from the response information, the proposed method failed to identify the beams. Several factors including noise, data latency, scale factor and cross coupling error were investigated. Amplitude and phase errors in the accelerometer's measurements were found to be the root cause. Alternative approaches are proposed to mitigate them. Following the suggested procedures, defect-free and defective fixed ended and simply supported beams are correctly identified. The proposed NDE procedure is accurate and robust, and can identify defects at the local element level in the context of the finite element representation. The laboratory experiments clearly and conclusively verified the proposed algorithm, i.e. a beam can be identified without using input excitation information and using only noise-contaminated response information and established its application potential.",
keywords = "Experimental verification, Finite element, Health assessment, System identification, Time domain",
author = "Vo, {P. H.} and Achintya Haldar",
year = "2008",
month = "2",
doi = "10.1080/15732470600677387",
language = "English (US)",
volume = "4",
pages = "45--56",
journal = "Structure and Infrastructure Engineering",
issn = "1573-2479",
publisher = "Taylor and Francis Ltd.",
number = "1",

}

TY - JOUR

T1 - Health assessment of beams-experimental verification

AU - Vo, P. H.

AU - Haldar, Achintya

PY - 2008/2

Y1 - 2008/2

N2 - A novel nondestructive structural health assessment procedure now under development at the University of Arizona and presented in a companion paper, is experimentally verified. The experimental verifications of the procedure to identify defect-free and defective fixed ended and simply supported beams are presented in this paper. In this approach, acceleration and rotational time histories are measured at pre-selected node points. They are then post-processed to remove several sources of error including noise, high frequency content, slope, and DC bias. The post-processed response information is then successively integrated to obtain the corresponding velocity and displacement time histories. Even when these sources of error were removed from the response information, the proposed method failed to identify the beams. Several factors including noise, data latency, scale factor and cross coupling error were investigated. Amplitude and phase errors in the accelerometer's measurements were found to be the root cause. Alternative approaches are proposed to mitigate them. Following the suggested procedures, defect-free and defective fixed ended and simply supported beams are correctly identified. The proposed NDE procedure is accurate and robust, and can identify defects at the local element level in the context of the finite element representation. The laboratory experiments clearly and conclusively verified the proposed algorithm, i.e. a beam can be identified without using input excitation information and using only noise-contaminated response information and established its application potential.

AB - A novel nondestructive structural health assessment procedure now under development at the University of Arizona and presented in a companion paper, is experimentally verified. The experimental verifications of the procedure to identify defect-free and defective fixed ended and simply supported beams are presented in this paper. In this approach, acceleration and rotational time histories are measured at pre-selected node points. They are then post-processed to remove several sources of error including noise, high frequency content, slope, and DC bias. The post-processed response information is then successively integrated to obtain the corresponding velocity and displacement time histories. Even when these sources of error were removed from the response information, the proposed method failed to identify the beams. Several factors including noise, data latency, scale factor and cross coupling error were investigated. Amplitude and phase errors in the accelerometer's measurements were found to be the root cause. Alternative approaches are proposed to mitigate them. Following the suggested procedures, defect-free and defective fixed ended and simply supported beams are correctly identified. The proposed NDE procedure is accurate and robust, and can identify defects at the local element level in the context of the finite element representation. The laboratory experiments clearly and conclusively verified the proposed algorithm, i.e. a beam can be identified without using input excitation information and using only noise-contaminated response information and established its application potential.

KW - Experimental verification

KW - Finite element

KW - Health assessment

KW - System identification

KW - Time domain

UR - http://www.scopus.com/inward/record.url?scp=39049104262&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=39049104262&partnerID=8YFLogxK

U2 - 10.1080/15732470600677387

DO - 10.1080/15732470600677387

M3 - Article

AN - SCOPUS:39049104262

VL - 4

SP - 45

EP - 56

JO - Structure and Infrastructure Engineering

JF - Structure and Infrastructure Engineering

SN - 1573-2479

IS - 1

ER -