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Title of Journal: J Mech Sci Technol

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Abbravation: Journal of Mechanical Science and Technology

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Korean Society of Mechanical Engineers

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DOI

10.1002/pmic.200401003

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1976-3824

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Effects of nearfield waves and phase information o

Authors: CheolHo Jeong JeongGuon Ih
Publish Date: 2010/04/16
Volume: 23, Issue: 8, Pages: 2193-2205
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Abstract

At high frequencies energy methods such as the statistical energy analysis and the power flow analysis have been popularly used to predict the averaged responses of vibroacoustic subsystems Usually these energy methods ignore flexural nearfield components and phase information mainly for simplicity Such assumptions sometimes lead to an erroneous conclusion in particular for complex structures and at medium frequencies around the Schroeder cutoff frequency This paper deals with the effects of nearfield waves and phase information at medium to high frequencies by using the ray tracing method RTM A curved beam and a coupled beam system were chosen as test examples which exhibit the typical mode conversion between various types of travelling waves Propagation of longitudinal flexural and torsional waves was studied based on the EulerBernoulli beam theory Analyses of the spatial distribution of vibrational energy quantities revealed that the conventional RTM could mimic the overall trend of the traveling wave solution However the results varied smoothly in space due to the neglect of wave interference By considering the phase information local fluctuations of vibration energy could be correctly described It was confirmed that the flexural nearfield plays a significant role near boundaries and junctions It was also shown that the accuracy of the analysis depends mainly on the modal overlap factor Similar to other high frequency methods the results become close to the traveling wave solutions as the modal overlap factor increasesCheolHo Jeong received his MS and PhD degrees from KAIST in 2002 and 2007 respectively He is currently an assistant professor in the Department of Electrical Engineering at Technical University of Denmark in Denmark His research interests include room acoustics building acoustics and structural acousticsJeongGuon Ih earned MS and PhD degrees from KAIST in 1981 and 1985 respectively He is currently a full professor in the Department of Mechanical Engineering at KAIST in Daejeon Korea He serves as an Editor of the Applied Acoustics journal and the head vicepresident of the Acoustical Society of Korea His research interests include duct acoustics vehicle noise/vibration control theoretical and experimental modeling of vibroacoustic fields and sources product sound quality

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