The effect of low-frequency vibration varitations in vibro- acoustic test for crack detection

Khalid, Muhammad Syafiq (2021) The effect of low-frequency vibration varitations in vibro- acoustic test for crack detection. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This report is the study of the effect of low frequency excitation on nonlinear vibroacoustic test to detect crack on a structure. In general there are various type of damage and flaw that can impact on a microstructure and some test needed to be run in order to analyze condition of the structure. Past study shows that vibro-acoustic test is one of the effective way to detect crack on metallic structure. In this thesis, low frequency vibration was introduced to both damage and undamaged structure in order to gain the modulation intensity of the specimen. Using a non-linear vibro-acoustic test, this research investigates the influence of low and high frequency stimulation on structures with various types of cracks. To begin, learn how to use all of the equipment used in vibro-acoustic testing in the laboratory. Then, articles and journal from previous study regarding the topic needed to be collected and to make literature review. From the data collected from each study, the result of modulation intensity are taken down to analyze the factor that causes increment of the R-value. Lastly, the difference of modulation intensity of each journal is discussed and compared in this thesis.

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