An Effective Impact Detection Method for Composite Curved Panel

ANNs are only accurate for the scope of the given training data which is not suitable for real life impact localisation due to the large range of possible impact variation. Impact data was collected for a variation of impact cases (angle, mass and energy) on a sensorized curved composite panel. From observation of the obtained data, a robust signal Time of Arrival (TOA) extraction method is proposed using a Normalised Smooth Envelope Threshold (NSET) which is a modification of the currently known Normalised Threshold (NT) method. Two ANNs were trained using TOA extracted with the NT and NSET method from a baseline case and tested with TOA extracted from cases having added variation of impact condition. The results show that the proposed NSET method results in more accurate results for impact cases different to the training case and thus allows for only a single impact training case to accurately predict cases with multiple variation. This enhances the applicability of ANNs for impact localisation in real life conditions.

[1]  Dae-Un Sung,et al.  Impact Monitoring of Smart Composite Laminates Using Neural Network and Wavelet Analysis , 2000 .

[2]  Jin-Hyuk Kim,et al.  Real‐time impact identification algorithm for composite structures using fiber Bragg grating sensors , 2012 .

[3]  F. L. D. Scalea,et al.  Macro-fiber composite piezoelectric rosettes for acoustic source location in complex structures , 2007 .

[4]  Z. Su,et al.  Identification of Damage Using Lamb Waves , 2009 .

[5]  W. Staszewski,et al.  Impact damage location in composite structures using optimized sensor triangulation procedure , 2003 .

[6]  M. H. Aliabadi,et al.  Optimal sensor positioning for impact localization in smart composite panels , 2013 .

[7]  Hyonny Kim,et al.  Impact Damage Formation on Composite Aircraft Structures , 2010 .

[8]  Z. Sharif-Khodaei,et al.  Determination of impact location on composite stiffened panels , 2012 .

[9]  Nan Yue,et al.  Assessment of impact detection tchniques for aeronautical application: ANN vs. LSSVM , 2016 .

[10]  W. Staszewski,et al.  Health monitoring of aerospace composite structures – Active and passive approach , 2009 .

[11]  M. Aliabadi,et al.  Impact Detection and Identification with Piezoceramic Sensors: Passive Sensing , 2018 .

[12]  M. H. Aliabadi,et al.  Reliability based impact localization in composite panels using Bayesian updating and the Kalman filter , 2018 .

[13]  T. Kundu,et al.  Acoustic source localization in anisotropic plates. , 2012, Ultrasonics.

[14]  Robin Olsson,et al.  Impact on composite structures , 2004, The Aeronautical Journal (1968).