Acoustic-based damage detection method

Most of the structural health monitoring (SHM) methods is either based on vibration-based and contact acoustic emission (AE) techniques. Both vibration-based and acoustic emission techniques require attaching transducers to structure. In many applications, such as those involving hot structural materials for thermal protection purposes or in rotating machines, noncontact measurements would be preferred because the operating environment is prohibitive leading to potential damage in contact sensors or their attachments. In this paper, a new noncontact, acoustic-based damage detection method is proposed and tested with an objective that the proposed method is able to detect the location and extend of damage accurately. The proposed acoustic-based damage detection method is a direct method. In this proposed method, changes in vibro-acoustics flexibility matrices of the damage and health structure are used to predict the location and extend of damage in the structure. A case study involving actual measured date for the case of a fixed-fixed plate structure is used to evaluate the effectiveness of the proposed method. The results have shown that the proposed acoustic-based damage detection method can be used to detect the location and extend of the damage accurately.

[1]  Abdelkader Frendi,et al.  An efficient model for coupling structural vibrations with acoustic radiation , 1995 .

[2]  Massimo Ruzzene.  Vibration and sound radiation of sandwich beams with honeycomb truss core , 2004 .

[3]  Theodor Freiheit,et al.  Non-contact experimental modal analysis using air excitation and a microphone array , 2010 .

[4]  Antonio Vecchio,et al.  Acoustical signature analysis of a helicopter cabin in steady-state and run up operational conditions , 2010 .

[5]  Peter Gudmundson.  Acoustic emission and dynamic energy release rate for steady growth of a tunneling crack in a plate in tension , 1999 .

[6]  Elena Pierro,et al.  On the vibro-acoustical operational modal analysis of a helicopter cabin , 2009 .

[7]  David,et al.  Observations of acoustic emission activity during gear defect diagnosis , 2003 .

[8]  Douglas E. Adams,et al.  Material Damage Modeling and Detection in a Homogeneous Thin Metallic Sheet and Sandwich Panel using Passive Acoustic Transmission , 2006 .

[9]  John G. Cherng,et al.  Application of acoustic metrology for detection of plate thickness change , 1996 .

[10]  Robert D. Adams,et al.  A Vibration Technique for Non-Destructively Assessing the Integrity of Structures: , 1978 .

[11]  P. Frank Pai,et al.  Detection of Defects in Circular Plates using a Scanning Laser Vibrometer , 2002 .

[12]  G Busse,et al.  Nonlinear modulation technique for NDE with air-coupled ultrasound. , 2004, Ultrasonics.

[13]  Zheng-Dong Ma,et al.  Sensitivity Analysis Methods for Coupled Acoustic-Structural Systems Part I: Modal Sensitivities , 1991 .

[14]  Paul Sas,et al.  Modal Analysis Theory and Testing , 2005 .

[15]  M. C. Junger.  Acoustic fluid-elastic structure interactions: Basic concepts , 1997 .

[16]  Zheng-Dong Ma,et al.  Improved mode-superposition technique for modal frequency response analysis of coupled acoustic-structural systems , 1991 .

[17]  Michael J. Miksis,et al.  Panel Oscillations and Acoustic Waves , 1995 .

[18]  Pc Pandey,et al.  Multilayer perceptron in damage detection of bridge structures , 1995 .

[19]  P. Sas,et al.  Vibro‐acoustical modal analysis: Reciprocity, model symmetry, and model validity , 1996 .