Proceedings of the Korean Society for Noise and Vibration Engineering Conference (한국소음진동공학회:학술대회논문집)
- 2009.10a
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- Pages.110-112
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- 2009
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- 1598-2548(pISSN)
Experimental Identification of Input Power to the Plate Using the Transient Structural Intensity Map
- Oey, Agustinus (Department of Mechanical Engineering, KAIST) ;
- Ih, Jeong-Guon (Department of Mechanical Engineering, KAIST)
- Published : 2009.10.29
Abstract
Transient acoustic pressure in the near field of an impacted plate carries information that can be utilized for recovering the impact force history. The inverse calculation approach using BEM-based NAH, which is conventionally used for time harmonic excitation, can be applied for reconstructing the transient waves using the principle of Fourier transform and spectral analysis. Then, using the recovered velocity in normal direction of the plate surface, the corresponding structural intensity can be obtained and the identification of input power can be performed. However, several manipulations should be given to overcome numerical artifacts, such as aliasing and erratic oscillation at discontinuity, and to suppress the effect of noise. Experiment using a simply supported plate is presented for demonstration purpose.