Damage detection of surface cracks in composite laminates using modal analysis and strain energy method

Tel. +32 16 384200This work presents experimental results for structural health monitoring method based on modal properties. The test subject is a composite helicopter main rotor blade, which is a highly flexible, slender beam that can display unusual dynamic behavior with orthotropic properties. A damage method detection based on the coordinate modal assurance criterion (COMAC) was implemented and evaluated on a real-size helicopter main rotor blade. This method uses the global modal properties of the system to identify and locate damaged based on a sensor network. Additionally, simpler methods of tracking changes and detecting damage are evaluated, such as natural frequency tracking and modal assurance criterion (MAC). A test setup was built to carry out an experimental modal analysis on the main rotor blade. For that purpose, a total of 55 uniaxial accelerometers were used for the sensor network along the blade in a way to measure the most significant vibration modes and an electrodynamic shaker was used to excite the system. Vibration modes and natural frequencies were identified by means of a least squares fit (PolyMAX), with damage being simulated on the blade by attaching a small mass to it, changing its global properties this way. Experimental results for the damage detection techniques are shown and a comparison between the methods is also made.

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“…Moreover, truncation to zero for values below a certain threshold is used. 16 Figures 17 and 18 show the results with and without truncation. …”

Section: Iiib Damage Detection Experimental Resultsmentioning

confidence: 97%

Modal-Based Damage Detection of a Composite Helicopter Main Rotor Blade

Santos

Peeters

Auweraer

et al. 2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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“…Firstly, a signal is decomposed by SWT using Eqs. (13) and (14). Secondly, the decomposition detail coefficients are thresholded by using the soft-thresholding equations (17) and (18).…”

Section: Reduction Of Noisementioning

confidence: 99%

“…In order to detect damage, Sampaio et al [13] directly subtracted the values of the mode shape curvature of the damaged structure from that of the undamaged structure. Hu et al [14] used the strain energies of laminated plates before and after damage to define a damage index which successfully identified surface crack location.…”

Section: Introductionmentioning

confidence: 99%

Crack detection in simply supported beams without baseline modal parameters by stationary wavelet transform

Zhong

Oyadiji

2007

Mechanical Systems and Signal Processing

102

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“…Hu et al [16] applied MSE to successfully identify surface crack in various composite laminates by employing a differential quadrature method (DQM) for the computation of the partial differential terms of MSE formula. Only the first six measured mode shapes are required to locate the surface crack in the laminate plates.…”

Section: Introductionmentioning

confidence: 99%

Development of scanning damage index for the damage detection of plate structures using modal strain energy method

Hu¹,

Wu²

2009

Mechanical Systems and Signal Processing

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Damage detection of surface cracks in composite laminates using modal analysis and strain energy method

Cited by 105 publications

References 10 publications

Modal-Based Damage Detection of a Composite Helicopter Main Rotor Blade

Modal-Based Damage Detection of a Composite Helicopter Main Rotor Blade

Crack detection in simply supported beams without baseline modal parameters by stationary wavelet transform

Development of scanning damage index for the damage detection of plate structures using modal strain energy method

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