Effect Of Various Low Frequencies For Crack Detection In Non-Linear Vibro-Acoustic Method

Liew, Ming Young (2017) Effect Of Various Low Frequencies For Crack Detection In Non-Linear Vibro-Acoustic Method. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) Effect Of Various Low Frequencies For Crack Detection In Non-Linear Vibro-Acoustic Method.pdf - Submitted Version Download (335kB)

Abstract

Structural Health Monitoring is a very common and popular in maintenance engineering to maintain the performance and reliability of the structure. This technique is used to detect detection in the structure for further maintenance. Non-linear vibro-acoustic is a unique technique that suitable for fatigue crack detection. Vibro-acoustic technique is a method which introducing two type of frequency into a structure for defect detection. The two frequencies are high frequency acoustic wave and low frequency excitation. Wave distortion effects will be produced when the acoustic wave interact with the damaged in the structures. There are few parameters which will affect the non-linear vibro-acoustic test which included high frequency acoustic wave, low frequency vibration excitation, excitation locations and location of sensor. However, the study of non-linear effect of low frequency excitation to detect the crack is still not much done by previous researcher. Thus, experimental works performed with resonance and non-resonance frequency as low frequency excitation to determine the non-linear effect of low frequency in the vibro-acoustic test. Nonlinear acoustic tests performed on an aluminium plate with total of 10± 1mm fatigue crack and result proved that the low frequency excitation will affect the modulation intensity in vibro-acoustic test.

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