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Identification of the beat characteristics and dam** ratios of the Hwacheon World Peace Bell using wavelet transform

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Abstract

In this paper, a new measurement technique is proposed to identify the beat characteristics and modal dam** ratios of a Korean bell in the casting field. The beat response caused by the mutual interference of mode pair with very close doublet frequency is unique feature of the Korean bell and should be accurately measured in order to quantitatively estimate the bell sound. However, the conventional method based on a filtering concept such as the Fourier transform has difficulty in extracting the beat frequencies and modal dam** ratios because the method should individually decompose the measured signal into each mode. The aim of this paper is to propose an effective measurement method to identify the beat frequencies, mode pairs and modal dam** ratios using the continuous wavelet transform in a real striking condition. The proposed method is verified with the Hwacheon World Peace Bell cast in the year 2008, which is the largest bell in Korea. In the future, the proposed method can be applicable to the casting field of the Korean bell to effectively estimate its beat characteristics and dam** characteristics.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 151-744, Korea

    Sung Yong Park, Won Tae Jeong & Yeon June Kang

  2. Division of Mechanical and Mechatronics Engineering, Kangwon National University, Kangwon-Do, 200-701, Korea

    Seockhyun Kim

Authors
  1. Sung Yong Park
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  2. Won Tae Jeong
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  3. Seockhyun Kim
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  4. Yeon June Kang
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Corresponding author

Correspondence to Seockhyun Kim.

Additional information

This paper was recommended for publication in revised form by Associate Editor Eung-Soo Shin

Sung Yong Park received his B.S. degree in Mechanical Engineering from Myongji University (Yongin, Korea) in 2003. After completing the B.S. degree, he received Ph.D. degree from the School of Mechanical and Aerospace Engineering at Seoul National University (Seoul, Korea) in 2009. His main research areas are the coupling analysis of the vibro-acoustic coupled system, the modal parameter estimation of the mechanical system using the continuous wavelet transform. Also, he has been particularly interested in the vibration analysis and design of the Korean bell. He is now working as a researcher of HDD storage division in Samsung Electronics.

Seockhyun Kim received the B.S. and the Ph.D. degree in Mechanical Engineering from Seoul National University (Seoul, Korea) in 1980 and 1987 respectively. In 1988, he joined the faculty of Kangwon National University, where he is currently a professor in the school of Mechatronics Engineering. His main research areas include Korean bells, vibration analysis of the high speed railway vehicle, vibration and noise analysis of the wind turbine, the coupling analysis of the vibro-acoustic coupled system and so on. Also, he is now working as a member of the Editorial Board in the Journal of Mechanical Science and Technology, and a vicechairman of the Society of Korean bell (Korea).

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Park, S.Y., Jeong, W.T., Kim, S. et al. Identification of the beat characteristics and dam** ratios of the Hwacheon World Peace Bell using wavelet transform. J Mech Sci Technol 23, 3049–3058 (2009). https://doi.org/10.1007/s12206-009-0821-6

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  • DOI: https://doi.org/10.1007/s12206-009-0821-6

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