Effect Of Low Frequency Excitation Location For Crack Detection In Aluminium Plate Using Nonlinear Vibro-Acoustic Method

Fatigue crack occurs due to the material failure to withstand the load when applied repeatedly. Nonlinear vibro-acoustic is a highly reliable and sensitive method for damage detection. Vibro-acoustics method (VAM) is a method based on the fact that a high frequency ultrasonic wave propagates in the...

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Main Author:	Hermanto, Tino
Format:	Thesis
Language:	English English
Published:	2021
Subjects:	T Technology (General)
Online Access:	http://eprints.utem.edu.my/id/eprint/25415/1/Effect%20Of%20Low%20Frequency%20Excitation%20Location%20For%20Crack%20Detection%20In%20Aluminium%20Plate%20Using%20Nonlinear%20Vibro-Acoustic%20Method.pdf http://eprints.utem.edu.my/id/eprint/25415/2/Effect%20Of%20Low%20Frequency%20Excitation%20Location%20For%20Crack%20Detection%20In%20Aluminium%20Plate%20Using%20Nonlinear%20Vibro-Acoustic%20Method.pdf
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id	my-utem-ep.25415
record_format	uketd_dc
institution	Universiti Teknikal Malaysia Melaka
collection	UTeM Repository
language	English English
advisor	Dullah, Abd Rahman
topic	T Technology (General) T Technology (General)
spellingShingle	T Technology (General) T Technology (General) Hermanto, Tino Effect Of Low Frequency Excitation Location For Crack Detection In Aluminium Plate Using Nonlinear Vibro-Acoustic Method
description	Fatigue crack occurs due to the material failure to withstand the load when applied repeatedly. Nonlinear vibro-acoustic is a highly reliable and sensitive method for damage detection. Vibro-acoustics method (VAM) is a method based on the fact that a high frequency ultrasonic wave propagates in the testing structure is modulated by the low frequency excitation. Besides that, the interaction between a high frequency vibration and a low frequency vibration results in nonlinear acoustic wave modulation. Low frequency excitation is a crucial element of nonlinear acoustic technique when used for crack detection. It is important to know what frequencies and level of excitation required to fully open cracks and where to excite the structure in order to maximize the detectability of the crack. The purpose of this research are to determine the optimized excitation location and investigate the effect of the first three vibration mode shapes natural frequencies on crack detection in cracked aluminium Al-2024 plate specimen by using VAM techniques. Micro-crack was created on aluminium plate by using Electro Discharge Machine (EDM) and fatigue test. The plate was hung with cords to provide free boundary condition. A mechanical shaker by a TIRA GmbH type S 50018 is attached at bottom corner of the plate and suspended by soft string. The piezoelectric transducer were used to provide simultaneous interaction between low frequency excitation and high frequency inputs respectively. Three middle cracked plate were excited with first, second and third mode frequency excitation at excitations 21 positions for modal analysis. The experimental modal analysis carried out were validated by finite element model simulation. The surface deflection above the crack are measured by Optomet SWIR scanning laser Doppler vibrometer in time domain signal are converted into frequency signal by using MATLAB software. Surface deflections was used to determine the most effective frequency mode and excitation location. The amplitude modulation intensity, R-values were used to determine the effectiveness of the frequency to predict the crack location in the aluminium plate. The results show the surface deflection and R-value are highest at the bottom corner of the plate. These shows that the most effective locations for excitation is at the edge of plate (location 15) and first vibration mode frequency produces the most significant effect on crack detection. Thus the selection of vibration mode frequency and excitation location are important in nonlinear vibro-acoustic defect detection technique.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Hermanto, Tino
author_facet	Hermanto, Tino
author_sort	Hermanto, Tino
title	Effect Of Low Frequency Excitation Location For Crack Detection In Aluminium Plate Using Nonlinear Vibro-Acoustic Method
title_short	Effect Of Low Frequency Excitation Location For Crack Detection In Aluminium Plate Using Nonlinear Vibro-Acoustic Method
title_full	Effect Of Low Frequency Excitation Location For Crack Detection In Aluminium Plate Using Nonlinear Vibro-Acoustic Method
title_fullStr	Effect Of Low Frequency Excitation Location For Crack Detection In Aluminium Plate Using Nonlinear Vibro-Acoustic Method
title_full_unstemmed	Effect Of Low Frequency Excitation Location For Crack Detection In Aluminium Plate Using Nonlinear Vibro-Acoustic Method
title_sort	effect of low frequency excitation location for crack detection in aluminium plate using nonlinear vibro-acoustic method
granting_institution	Universiti Teknikal Malaysia Melaka
granting_department	Faculty Of Mechanical Engineering
publishDate	2021
url	http://eprints.utem.edu.my/id/eprint/25415/1/Effect%20Of%20Low%20Frequency%20Excitation%20Location%20For%20Crack%20Detection%20In%20Aluminium%20Plate%20Using%20Nonlinear%20Vibro-Acoustic%20Method.pdf http://eprints.utem.edu.my/id/eprint/25415/2/Effect%20Of%20Low%20Frequency%20Excitation%20Location%20For%20Crack%20Detection%20In%20Aluminium%20Plate%20Using%20Nonlinear%20Vibro-Acoustic%20Method.pdf
_version_	1747834122876747776
spelling	my-utem-ep.254152021-12-07T15:44:42Z Effect Of Low Frequency Excitation Location For Crack Detection In Aluminium Plate Using Nonlinear Vibro-Acoustic Method 2021 Hermanto, Tino T Technology (General) TA Engineering (General). Civil engineering (General) Fatigue crack occurs due to the material failure to withstand the load when applied repeatedly. Nonlinear vibro-acoustic is a highly reliable and sensitive method for damage detection. Vibro-acoustics method (VAM) is a method based on the fact that a high frequency ultrasonic wave propagates in the testing structure is modulated by the low frequency excitation. Besides that, the interaction between a high frequency vibration and a low frequency vibration results in nonlinear acoustic wave modulation. Low frequency excitation is a crucial element of nonlinear acoustic technique when used for crack detection. It is important to know what frequencies and level of excitation required to fully open cracks and where to excite the structure in order to maximize the detectability of the crack. The purpose of this research are to determine the optimized excitation location and investigate the effect of the first three vibration mode shapes natural frequencies on crack detection in cracked aluminium Al-2024 plate specimen by using VAM techniques. Micro-crack was created on aluminium plate by using Electro Discharge Machine (EDM) and fatigue test. The plate was hung with cords to provide free boundary condition. A mechanical shaker by a TIRA GmbH type S 50018 is attached at bottom corner of the plate and suspended by soft string. The piezoelectric transducer were used to provide simultaneous interaction between low frequency excitation and high frequency inputs respectively. Three middle cracked plate were excited with first, second and third mode frequency excitation at excitations 21 positions for modal analysis. The experimental modal analysis carried out were validated by finite element model simulation. The surface deflection above the crack are measured by Optomet SWIR scanning laser Doppler vibrometer in time domain signal are converted into frequency signal by using MATLAB software. Surface deflections was used to determine the most effective frequency mode and excitation location. The amplitude modulation intensity, R-values were used to determine the effectiveness of the frequency to predict the crack location in the aluminium plate. The results show the surface deflection and R-value are highest at the bottom corner of the plate. These shows that the most effective locations for excitation is at the edge of plate (location 15) and first vibration mode frequency produces the most significant effect on crack detection. Thus the selection of vibration mode frequency and excitation location are important in nonlinear vibro-acoustic defect detection technique. 2021 Thesis http://eprints.utem.edu.my/id/eprint/25415/ http://eprints.utem.edu.my/id/eprint/25415/1/Effect%20Of%20Low%20Frequency%20Excitation%20Location%20For%20Crack%20Detection%20In%20Aluminium%20Plate%20Using%20Nonlinear%20Vibro-Acoustic%20Method.pdf text en public http://eprints.utem.edu.my/id/eprint/25415/2/Effect%20Of%20Low%20Frequency%20Excitation%20Location%20For%20Crack%20Detection%20In%20Aluminium%20Plate%20Using%20Nonlinear%20Vibro-Acoustic%20Method.pdf text en validuser https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=119716 mphil masters Universiti Teknikal Malaysia Melaka Faculty Of Mechanical Engineering Dullah, Abd Rahman 1. Broda, D., Staszewski, W., Martowicz, A., Uhl, T. & Silberschmidt, V. (2014). Modelling of nonlinear crack–wave interactions for damage detection based on ultrasound-a review. J. 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In Kundu, T. (Ed.) Health Monitoring of Structural and Biological Systems. Proc. SPIE, 7295: 72950J- 72950J-9. 16. Parsons, Z. & Staweszewski, W.J. (2006). Nonlinear acoustic with low-profile piezoceramic excitation for crack detection in metallic structures. Smart Mater. Struct., 15: 1110-1118. 17. Payan, A., Garnier, V. & Moysan, J. (2010). Potential of nonlinear ultrasonic indicators for nondestructive testing of concrete. Adv. Civ. Eng., Vol. 2010:1–8. 18. Straka, L., Yagodzinsky, Y, Landa, M & Hänninen, H. (2008). Detection of structural damage of aluminum alloy 6082 using elastic wave modulation spectroscopy. NDT E. Int., 41: 554–563. 19. Sutin, A. M. & Johnson, P. (2005). Nonlinear elastic wave NDE II. Nonlinear wave modulation spectroscopy and nonlinear time reversed acoustics. AIP Conf. Proc., 760: 385 20. Pieczonka, L., Martowicz, A. & Staszewski, W. (2016). Nonlinear vibroacoustic wave modulations for structural damage detection: An overview. Optical Eng., 55: 1. 21. Tszeng, T.C. (2013). Modulation spectroscopy of acoustic waves in solids containing contact-type cracks. J. Vib. Acoust., 135: 064504-064504-6. 22. Van Den Abeele, K. & De Visscher, J. (2000). Damage assessment in reinforced concrete using spectral and temporal nonlinear vibration techniques. Cem. Conr. Res., 30: 1453–64. 23. Zagrai, A., Donskoy, D. & Lottiaux, J. (2004). N-Scan®: new vibromodulation system for crack detection, monitoring and characterization. AIP Conf. Proc., 700:1414–1421. 24. Zagrai, A., Donskoy, D., Chudnovsky, C. & Golovin, E. (2008). Micro and macroscale damage detection using the nonlinear acoustic vibro-modulation technique. Res. Nondestr. Eval., 19: 104–128. 25. Zaitsev, V.Y., Matveev, L.A. & Matveyev, A.L. (2011). Elastic-wave modulation approach to crack detection: comparison of conventional modulation and higher-order interactions. NDT E. Int., 44: 21–31. 26. Zaitsev, V.Y., Gusev, V. & Castagnéde, B. (2003). 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Effect Of Low Frequency Excitation Location For Crack Detection In Aluminium Plate Using Nonlinear Vibro-Acoustic Method

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