Monitoring crack growth through change of modal parameters

Swamidas, A. S. J.; Chen, Y.

doi:10.1006/jsvi.1995.0452

Cited by 52 publications

(37 citation statements)

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“…Swamidas and Chen [68] performed a finite element-based modal analysis on a cantilever plate with a small crack. It was found that the surface crack in the structure will affect most of the modal parameters, such as the natural frequencies of the structure, amplitudes of the response and mode shapes.…”

Section: Traditionalmentioning

confidence: 99%

Vibration-based Damage Identification Methods: A Review and Comparative Study

Fan

Qiao

2010

Structural Health Monitoring

1,599

215

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A comprehensive review on modal parameter-based damage identification methods for beam-or plate-type structures is presented, and the damage identification algorithms in terms of signal processing are particularly emphasized. Based on the vibration features, the damage identification methods are classified into four major categories: natural frequency-based methods, mode shape-based methods, curvature mode shape-based methods, and methods using both mode shapes and frequencies, and their merits and drawbacks are discussed. It is observed that most mode shape-based and curvature mode shape-based methods only focus on damage localization. In order to precisely locate the damage, the mode shape-based methods have to rely on optimization algorithms or signal processing techniques; while the curvature mode shape-based methods are in general a very effective type of damage localization algorithms. As an implementation, a comparative study of five extensively-used damage detection algorithms for beam-type structures is conducted to evaluate and demonstrate the validity and effectiveness of the signal processing algorithms. This brief review aims to help the readers in identifying starting points for research in vibration-based damage identification and structural health monitoring and guides researchers and practitioners in better implementing available damage identification algorithms and signal processing methods for beam-or plate-type structures.

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Section: Traditionalmentioning

confidence: 99%

Vibration-based Damage Identification Methods: A Review and Comparative Study

Fan

Qiao

2010

Structural Health Monitoring

1,599

215

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“…Additional damage detection research originating in the late 1980s and the 1990s involved trusses [25][26][27], plates [28][29][30][31][32], buildings [33,34], concrete beams [35,36], shells and frames [37][38][39], horizontal axis wind turbine blades [40], and aircraft structures [41]. The global methods used in these damage detection investigations will be mentioned in more detail in Section 2.2.3.…”

Section: Historical Perspectivementioning

confidence: 99%

Design and Analysis of Advanced Materials in a Thermal/Acoustic Environment. Delivery Order 0007: Volume 1 - Structural Health Monitoring

Grandhi¹,

Tobe²

2010

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information , 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YY) REPORT TYPE 3. DATES COVERED (From -To)March 2010 0A PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBERWright State University Department of Mechanical and Materials Engineering Dayton, OH 45435 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Air Force Research Laboratory SPONSORING/MONITORING AGENCY ACRONYM(S)Air ABSTRACTAir vehicles flying at hypersonic speeds encounter extreme thermal, aerodynamic and acoustic loads, utilizing thermal protection systems to shield the main structure from these 1oads.One type of failure in a mechanically attached thermal protection system is fastener failure. Determining structural health monitoring on the fastener health of the thermal protection system is needed and can be completed by analyzing changes in the dynamic characteristics of the system due to fastener failure. The damage detection metrics include the existing modal parameters-modal assurance criterion (MAC), partial (PMAC), and coordinate (CMAC)-as well as two new modal parameters-normalized coordinate MAC and normalized coordinate MAC X summation were investigated. Two new modal parameters were formulated to identify mode shape changes in a structure due to global damage to the structure. Two damage states caused a minimal change to the low-frequency structural dynamics and could not be localized with any of the investigated damage metrics. After the finite element model is validated for the healthy state with free-free boundary conditions, the global boundary conditions and fastener failure damage states are implemented. This damage simulation allows a better understanding of how the damage states cause low-frequency dynamic changes without requiring a experimental data for each of the damage states of interest. SUBJECT TERMSThe damage detection metrics include the existing modal parameters-modal assurance criterion, partial modal assurance criterion, and coordinate modal assurance criterion-as well as two new modal parameters-normalized coordinate modal assurance criterion and normalized coordinate modal assurance criterion summation. The existing modal parameters provide data...

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“…Swamidas and Chen (1995) found that the best data for locating a crack in a cantilevered FE plate were the strain mode shape. Chen and Swamidas (1996) reported that a plate with a half thickness crack showed less than a 4% change in resonant frequency.…”

Section: Modal Property-based Methodsmentioning

confidence: 99%

A benchmark study of dynamic damage identification of plates

Currie¹,

Petrie²,

Mao³

et al. 2012

Proceedings of the Institution of Civil Engineers - Engineering

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Vibration-based methods for damage detection of structures are researched extensively among the academic community. Yet only limited success in practice has been reported. A major hurdle is understood to be the discrepancy between the assumed availability of pertinent modal data and the measurability of such data from actual experiments. However, dedicated critical studies into the practicality and limitation of modal testing for structural damage detection are scarce. This paper presents a laboratory investigation, along with finite-element (FE) analysis, into the extent to which modal frequencies and mode shapes may be measured in a plate-like structure and their general sensitivities to different levels of damage. The order of measurable modes and the measurement accuracy are assessed on the basis of the actual measurement in conjunction with FE predictions. Changes in the measured modal properties are examined in light of the pattern and severity of damage. Results indicate that with a typical modal testing it is possible to obtain the first 5-6 modes for a plate structure with sufficient accuracy in the frequencies but with a gross error of around 10% in the mode shapes. Using solely a few measurable natural frequencies will be insufficient to identify the occurrence and the degree of crack-induced damage. Mode shapes can be more indicative of local damage in a plate, especially when it involves an edge crack.

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Monitoring crack growth through change of modal parameters

Cited by 52 publications

References 0 publications

Vibration-based Damage Identification Methods: A Review and Comparative Study

Vibration-based Damage Identification Methods: A Review and Comparative Study

Design and Analysis of Advanced Materials in a Thermal/Acoustic Environment. Delivery Order 0007: Volume 1 - Structural Health Monitoring

A benchmark study of dynamic damage identification of plates

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