... )]. Mode shapes of the rotor with a radial crack 31 03 2010 16 07 2011 28 11 2011 28 11 2011 crack detection discs (structures) matrix algebra modal analysis rotors structural acoustics vibrations This technical note is to demonstrate, via a numerical study...

... identified and then the severity of the damage can be estimated through harmonic probing. 04 02 2010 20 01 2011 26 07 2011 26 07 2011 beams (structures) cantilevers crack detection elastic constants frequency response nonlinear acoustics polynomials structural acoustics...

...–Bernoulli beam. 20 09 2007 08 12 2008 09 09 2009 beams (structures) crack detection inverse problems optimisation vibrations In recent years, increasing attention has been focused on structural health monitoring and on nondestructive damage detection in many engineering...

... monitoring crack detection failure analysis machine testing rotors vibrations Due to the fact that propagating fatigue transverse cracks can have catastrophic effects on the reliability of the rotating machinery, an early detection of cracks (i.e., before the crack had propagated to a critical...

... a reference map of modal constants, which serves as a database of crack detection. If a high-fidelity finite element model for a rotating machine is available, the modal constants can be computed for a range of different levels of asymmetry and for all the corresponding locations of asymmetry. Such a database...

..., were identified using data from the damaged specimen alone while surface damage required the use of differencing algorithms in order to identify damage. 19 04 2007 20 10 2007 11 07 2008 aluminium crack detection numerical analysis plates (structures) structural acoustics...

...Shuncong Zhong; S. Olutunde Oyadiji This paper proposes a new approach based on auxiliary mass spatial probing by stationary wavelet transform (SWT) to provide a method for crack detection in beamlike structure. SWT can provide accurate estimation of the variances at each scale and facilitate...

...M. Karthikeyan; R. Tiwari; S. Talukdar The present work aims at the development of a method for the crack detection, localization and sizing in a beam based on the transverse force and response signals. The Timoshenko beam theory is applied for transverse vibrations of the beam model. The finite...

.... In mechanical fault detection, noise reduction has been mostly done using filters. However, filters are useful only for removing noises in certain frequency ranges. The white Gaussian noise contains components in all frequency ranges that cannot be effectively removed by filters. signal denoising crack...

... sizes on outer rings and inner rings of ball bearings. 07 09 2006 19 03 2007 fatigue condition monitoring ball bearings rolling bearings wavelet transforms vibrations crack detection demodulation wavelet mechanical shock response modal analysis vibratory analysis...

... PWAS at very low frequency ( 5 – 100 kHz ) , S0 mode vibration is very small and the A0 mode dominates (Fig. 10a ). Frequency tuning for crack detection in a 1 mm thick aluminum plate specimen: ( a ) strain-frequency plot and ( b ) group velocity-frequency plot Thus...

... and eigenfunctions feedback closed loop systems vibrations crack detection optimal control frequency measurement 2007 American Society of Mechanical Engineers ...

... - Congrès Français d’Acoustique, Tours, France. 28 07 2006 06 02 2007 bone nondestructive testing crack detection bioacoustics vibrations acoustic resonance biomechanics patient diagnosis piezoelectric transducers finite element analysis bone characterization nonlinear...

... piezoelectric transducers condition monitoring aerospace engineering acoustic applications crack detection corrosion Structural health monitoring (SHM) techniques are being developed to reduce operations and support costs, increase availability, and maintain safety of current and future air vehicle...

... case. 29 12 2005 12 10 2006 vibrations crack detection damping bending finite element analysis cracked beam free vibration crack localization crack sizing Most of current damage-detection method experimental techniques require that the vicinity of damages...

... the system during on-line operation. vibrations structural acoustics crack detection Operating rotating machinery with a rotor crack is very dangerous since the rotor crack grows with time and may fail, causing a catastrophic accident. It is customary to check the occurrence of a rotor crack...

... structure under moving vehicular loads. 25 11 2003 03 02 2006 crack detection bridges (structures) vibrations structural acoustics reinforced concrete moving load bridge dynamics nonlinearity reinforced concrete shape function regularization surface roughness vehicle...

.... Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS . Manuscript received May 14, 2003; final revision, January 20, 2004. Review conducted by S. Dyke. 14 May 2003 20 January 2004 21 03 2005 vibrations crack...

... to be independent. 11 08 2003 16 11 2004 29 11 2004 turbines fault diagnosis vibrational modes aerospace industry modelling variational techniques crack detection geometry Vehicle health monitoring systems are becoming a critical safety boosting component in a significant...

... been used to identify the crack.` 16 08 2000 08 09 2004 vibrations structural acoustics elastic constants crack detection elastic waves Galerkin method A 6.225 m long hydroelastic ship (see Fig. 1 ), representing a 1 ∕ 20 th scale model of a Canadian...