Damage localisation in thin panels using elastic wave propagation method
In this paper algorithm for damage localisation in thin panels made of aluminium alloy has been proposed.Mentioned algorithm uses Lamb wave propagation methods and geometrical approach for damage localisation.Elastic waves are generated and received using piezoelectric transducers.Excited elastic waves propagate and reflect from panel boundary and discontinuities existing in the panel.Wave reflection can be registered through the piezoelectric transducers and used in signal processing algorithm.Processing algorithm consists of two parts: signal filtering and extraction of damage location.The first part is used in order to remove noise from received signals.Second part allows to extract arrival time of waves reflected from discontinuity,very often called Time Of Flight (TOF).Localisation algorithm uses pairs of transducers from a concentrated transducers configuration.Using signals from pair of transducers two times of reflection can be extracted from received signals.Because coordinates of transducers are well known ellipse can be constructed based on extracted times of waves reflections.Damage lies one ellipse but it is not known exactly where.Therefore one ellipse is not enough to localise a discontinuity.In order of proper damage localisation more ellipses must be used.In this purpose signals received by larger number of transducers pairs are used in damage localisation algorithm.Points of ellipses intersections allow to indicate localisation of damage.Described signal processing algorithm has been coded in the MATLAB? environment.In this work experimental results has been presented.
damage localisation Structural Health Monitoring elastic waves signal processing
Tomasz Wandowski Pawel Malinowski Wieslaw Ostachowicz
Institute of Fluid-Flow Machinery of Polish Academy of Sciences Fiszera 14,80-952,Gdansk,Poland Institute of Fluid-Flow Machinery of Polish Academy of Sciences Fiszera 14,80-952,Gdansk,Poland Gdyn
国际会议
The 8th International Conference on Damage Assessment of Structures(DAMAS 2009)(第八届结构损伤评价国际学术会议)
北京
英文
87-93
2009-08-03（万方平台首次上网日期，不代表论文的发表时间）