Sound Radiation From Vibrating Plate With Different Boundary Conditions Using Discrete Source Technique

The study of sound radiation from vibrating plate is an important subject in acoustic and being widely explored throughout years. The aims of this thesis are first to develop sound radiation model from a vibrating plate using discrete elementary source for different boundary conditions such as free-...

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Main Author:	Ab. Latif, Nurain Shyafina
Format:	Thesis
Language:	English English
Published:	2016
Subjects:	T Technology (General)
Online Access:	http://eprints.utem.edu.my/id/eprint/18613/1/Sound%20Radiation%20From%20Vibrating%20Plate%20With%20Different%20Boundary%20Conditions%20Using%20Discrete%20Source%20Technique%2024%20Pages.pdf http://eprints.utem.edu.my/id/eprint/18613/2/Sound%20Radiation%20From%20Vibrating%20Plate%20With%20Different%20Boundary%20Conditions%20Using%20Discrete%20Source%20Technique.pdf
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record_format	uketd_dc
institution	Universiti Teknikal Malaysia Melaka
collection	UTeM Repository
language	English English
topic	T Technology (General) T Technology (General)
spellingShingle	T Technology (General) T Technology (General) Ab. Latif, Nurain Shyafina Sound Radiation From Vibrating Plate With Different Boundary Conditions Using Discrete Source Technique
description	The study of sound radiation from vibrating plate is an important subject in acoustic and being widely explored throughout years. The aims of this thesis are first to develop sound radiation model from a vibrating plate using discrete elementary source for different boundary conditions such as free-free, simply-supported and clamped-clamped. Secondly, the aim is to validate the radiation efficiency model between the proposed method and the experimental data. Analytical models of the sound radiation a rectangular plate are often based on simply supported edges for its mathematical convenience. Models for other boundary conditions also exist, but mostly these employ rather complicated analytical calculations. This study presents a mathematical model of the radiation efficiency for a baffled plate using a discrete elementary source model. The plate velocity from each element on the plate has been determined from Finite Element Analysis (FEA) then was inserted into MATLAB for radiation efficiency calculation. The model requires only the knowledge of the spatial distribution vibration velocity of the panel and hence, the surface velocity can be calculated conveniently by using the established mobility equations for different boundary conditions. The model from FEA has validated with theoretical model. After the validation, which the model from FEA shows good agreement with the theoretical model, then the radiation efficiency can be determined using velocity data from FEA modeling. For validation, the experiment was done in small chamber and reverberation chamber. The sound power was measured using reciprocal technique because of its convenient (time efficient, less cost) compared to direct method which needs the use of shaker. The experimental results are presented for free-free and clamped-clamped boundary conditions which show reasonable agreement with the predicted results. On the basis of the results of this research, it can be concluded that the clamped-clamped boundary condition has the highest radiation efficiency compared to free-free and simply-supported boundary conditions. The model to calculate the radiation efficiency from vibrating plate using discrete elementary source has been successfully modeled and validated with the experimental data.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Ab. Latif, Nurain Shyafina
author_facet	Ab. Latif, Nurain Shyafina
author_sort	Ab. Latif, Nurain Shyafina
title	Sound Radiation From Vibrating Plate With Different Boundary Conditions Using Discrete Source Technique
title_short	Sound Radiation From Vibrating Plate With Different Boundary Conditions Using Discrete Source Technique
title_full	Sound Radiation From Vibrating Plate With Different Boundary Conditions Using Discrete Source Technique
title_fullStr	Sound Radiation From Vibrating Plate With Different Boundary Conditions Using Discrete Source Technique
title_full_unstemmed	Sound Radiation From Vibrating Plate With Different Boundary Conditions Using Discrete Source Technique
title_sort	sound radiation from vibrating plate with different boundary conditions using discrete source technique
granting_institution	Universiti Teknikal Malaysia Melaka
granting_department	Faculty of Mechanical Engineering
publishDate	2016
url	http://eprints.utem.edu.my/id/eprint/18613/1/Sound%20Radiation%20From%20Vibrating%20Plate%20With%20Different%20Boundary%20Conditions%20Using%20Discrete%20Source%20Technique%2024%20Pages.pdf http://eprints.utem.edu.my/id/eprint/18613/2/Sound%20Radiation%20From%20Vibrating%20Plate%20With%20Different%20Boundary%20Conditions%20Using%20Discrete%20Source%20Technique.pdf
_version_	1747833943409819648
spelling	my-utem-ep.186132021-10-08T15:57:41Z Sound Radiation From Vibrating Plate With Different Boundary Conditions Using Discrete Source Technique 2016 Ab. Latif, Nurain Shyafina T Technology (General) TA Engineering (General). Civil engineering (General) The study of sound radiation from vibrating plate is an important subject in acoustic and being widely explored throughout years. The aims of this thesis are first to develop sound radiation model from a vibrating plate using discrete elementary source for different boundary conditions such as free-free, simply-supported and clamped-clamped. Secondly, the aim is to validate the radiation efficiency model between the proposed method and the experimental data. Analytical models of the sound radiation a rectangular plate are often based on simply supported edges for its mathematical convenience. Models for other boundary conditions also exist, but mostly these employ rather complicated analytical calculations. This study presents a mathematical model of the radiation efficiency for a baffled plate using a discrete elementary source model. The plate velocity from each element on the plate has been determined from Finite Element Analysis (FEA) then was inserted into MATLAB for radiation efficiency calculation. The model requires only the knowledge of the spatial distribution vibration velocity of the panel and hence, the surface velocity can be calculated conveniently by using the established mobility equations for different boundary conditions. The model from FEA has validated with theoretical model. After the validation, which the model from FEA shows good agreement with the theoretical model, then the radiation efficiency can be determined using velocity data from FEA modeling. For validation, the experiment was done in small chamber and reverberation chamber. The sound power was measured using reciprocal technique because of its convenient (time efficient, less cost) compared to direct method which needs the use of shaker. The experimental results are presented for free-free and clamped-clamped boundary conditions which show reasonable agreement with the predicted results. On the basis of the results of this research, it can be concluded that the clamped-clamped boundary condition has the highest radiation efficiency compared to free-free and simply-supported boundary conditions. The model to calculate the radiation efficiency from vibrating plate using discrete elementary source has been successfully modeled and validated with the experimental data. UTeM 2016 Thesis http://eprints.utem.edu.my/id/eprint/18613/ http://eprints.utem.edu.my/id/eprint/18613/1/Sound%20Radiation%20From%20Vibrating%20Plate%20With%20Different%20Boundary%20Conditions%20Using%20Discrete%20Source%20Technique%2024%20Pages.pdf text en public http://eprints.utem.edu.my/id/eprint/18613/2/Sound%20Radiation%20From%20Vibrating%20Plate%20With%20Different%20Boundary%20Conditions%20Using%20Discrete%20Source%20Technique.pdf text en validuser https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=100938 mphil masters Universiti Teknikal Malaysia Melaka Faculty of Mechanical Engineering 1. Berry, A., 1994. A New formulation for sound radiation of fluid loaded plates. Journal of the Acoustical Society of America, 96(1):2792–2802. 2. Berry, A., Guyader, J. L., and Nicolas, J., 1990. A general formulation for the sound radiation from rectangular, baffled plates with arbitrary boundary conditions. Journal of the Acoustical Society of America, 88(1):2792–2802. 3. 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Sound and Structural Vibration: Radiation, Transmission and Response, Academic Press, London. 10. Fahy, F. J. and Gardonio, P., 2007. Sound and Structural Vibration: Radiation, Transmission and Response, Academic press. 11. Gardonio, P., Bianchi, E., and Elliott, S., 2004. Smart panel with multiple decentralized units for the control of sound transmission. part i: Theoretical predictions. Journal of Sound and Vibration, 274(1):163–192. 12. Gardonio, P. and Brennan, M. J., 2004. Mobility and Impedance in Structural Dynamics in Fahy FJ and Walker J (eds) Advances in Acoustics, Noise and Vibration, Spon Press, London. 13. Gompert, M. C., 1974. Radiation from rigid baffled, rectangular plate with general boundary conditions. Acustica, 30(1):320–327. 14. Gompert, M. C., 1977. Sound radiation from baffled, thin, rectangular plates. Acustica, 37(1):93–102. 15. Health, U. D., Services, H., et al., 1998. Criteria for a recommended standard: Occupational noise exposure. revised criteria 1998. 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Theoretical Acoustics, McGraw-Hill, New York. 22. Putra, A. and Thompson, D., 2010a. Sound radiation from rectangular baffled and unbaffled plates. Applied Acoustics, 71(1):1112–1125. 23. Putra, A. and Thompson, D. J., 2010b. Sound radiation from perforated plates. Journal of Sound and Vibration, 329(20):4227–4250. 24. Rao, S. S. and Yap, F. F., 1995. Mechanical vibrations, volume 4, Addison-Wesley Reading. 25. Rayleigh, J. W. S. B., 1896. The Theory of Sound, volume 2, Macmillan. 26. SI-1972, A., 1972. Methods for determination of sound power level of small sources in reverbaration rooms. Acoustical Society of America. 27. Squicciarini, G., Putra, A., Thompson, D., Zhang, X., and Salim, M. A., 2015. Use of a reciprocity technique to measure the radiation efficiency of a vibrating structure. Applied Acoustics, 89(1):107–121. 28. Squicciarini, G., Thompson, D. J., and Corradi, R., 2014. The effect of different combinations of boundary conditions on the average radiation efficiency of rectangular plates. Journal of Sound and Vibration, 333:3931–3948. 29. Vitiello, P., Nelson, P. A., and Petyt, M., 1989. Numerical studies of the active control of sound transmission through double partitions. ISVR Technical Report, page 183. 30. Wallace, C., 1972. Radiation resistance of rectangular panel. Journal of the Acoustical Society of America, 51(1):946–952. 31. Warburton, G., 1954. The vibration of rectangular plates. Proceedings of the Institution of Mechanical Engineers, 168(1):371–384. 32. Weyman, P., 2006. Black and White Illustration. [online] Available at: http://www.getdomainvids.com/domain/pete-weyman-illustrations.co.uk/ (Accessed on 14September 2015). 33. Williams, E., 1983. A series of expansion of the acoustic power radiated from planar sources. Journal of the Acoustical Society of America, 75(1):1520–1524. 34. Williams, E. and Maynard, J., 1982. Numerical evaluation of the rayleigh integral for planar radiators using the FFT. Journal of the Acoustical Society of America, 72(1):2020–2030. 35. Xie, G., Thompson, D. J., and Jones, C. J. C., 2005. The radiation efficiency of baffled plates and strips. Journal of Sound and Vibration, 280(1):181–209. 36. Zhang, X. and Li, W. L., 2010. A unified approach for predicting sound radiation from baffle rectangular plates with arbitrary boundary conditions. Journal of Sound and Vibration,329:5307–5320.

Sound Radiation From Vibrating Plate With Different Boundary Conditions Using Discrete Source Technique

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