All Issue

2017 Vol.36, Issue 3 Preview Page
Beat tuning of Silla Great Bell

신라대종의 맥놀이 조절

Seockhyun Kim1*
,
Joong Hyeok Lee2
김 석현1*
,
이 중혁2
1Department of Mechatronics Engineering, Kangwon National Uni-versity
1강원대학교 기계융합공학부
2강원대학교 기계융합공학과
*교신저자. *Corresponding Author. 
31 May 2017. pp. 194-201
PDF XML Citation
Abstract

Silla Great Bell was made to reproduce King Seongdeok Divine Bell and it was restored to have the same structure and patterns. The most difficult problem was to reproduce the magnificent striking sound and dynamic hum tone with strong beat like in King Seongdeok Divine Bell. Especially, beating sound is attributed to the uncontrollable asymmetry occurring in the casting process, so it can not be predicted or controlled before casting. In this study, we introduce the method and process to make Silla Great Bell have a strong beat with a proper period. Position conditions of mode pairs and striking point for a strong beat were identified. Bell thickness was locally decreased to make proper period of beat. The process was performed according to the simulation result of an equivalent bell model. As a result, the original weak and long beat was made to a strong beat with a proper period.

Keywords
Silla Great Bell
Beat
Equivalent bell
King Seongdeok Divine Bell

신라대종은 성덕대왕신종을 재현하려는 목적으로 제작 되었으며, 동일한 구조와 문양을 갖도록 복원되었다. 가장 어려운 문제는 성덕대왕신종의 소리에 걸 맞는 웅장하고 조화로운 타격음과 끊어질 듯 이어지는 여음의 맥놀이를 재현하는 것이었다. 특히 맥놀이는 주조과정에서 발생하는 제어 불가능한 미세 비대칭성에 기인하므로, 주조 전에는 그 특성을 예측하거나 제어할 수 없다. 본 연구에서는 주조 후 맥놀이의 조절 작업을 통하여 신라대종의 맥놀이가 강하고 적절한 주기를 갖도록 만드는 방법과 과정을 소개한다. 강한 맥놀이를 만드는 모드 쌍과 당좌의 배치 조건을 구하였고, 적절한 주기를 갖도록 종 내부의 두께를 국부적으로 감소시켰다. 이 작업은 등가 종을 이용한 시뮬레이션 결과에 따라 수행되었다. 그 결과 약하고 매우 길었던 초기의 맥놀이는 강하고 적절한 주기의 맥놀이로 만들어졌다.

키워드
신라대종
맥놀이
등가 종
성덕대왕신종
References
1
S. H. Kim, “Report on the acoustic characteristics of King Seongdeok Divine Bell,” Gyeongju National Museum, Rep., 2003.
2
Y. G. Choi, “A study on theme park development of King Seongdeok Divine Bell,” Silla Cultural Heritage Research institute, Rep., 2016.
3
J. M. Lee, S. H. Cheon, S. H. Kim, and Y. H. Yum, “A study on the vibrational characteristics of Korean bells(I),” Trans. Korean Soc. Mech. Eng. 13, 397-403 (1989).
4
S. H. Kim, W. Soedel, and J. M. Lee, “Analysis of the beating response of bell type structures,” J. Sound Vib. 173, 517-536 (1994).
5
J. M. Lee, S. H. Kim, S. J. Lee, J. D. Jeong, and H. G. Choi, “A Study on the vibration characteristics of a large size Korean bell,” J. Sound Vib. 257, 779-790 (2002).
6
Y. H. Yeom, Korean Bell (Korea Institute of Spiritual Culture, Seoul, 1984), pp. 55.
7
“King Seongdeok Divine Bell comprehensive report,” Gyeongju National Museum, Rep., 1999.
8
S. H. Kim, “Final report on the design and manufacture of Silla Great Bell,” Society of Korean Bell, Rep., 2016.
9
S. H. Kim, J. H. Lee, and J. H. Byeon, “Vibration and sound of Silla Great Bell” (in Korean),  J. Acoust. Soc. Kr. 36, 186-193 (2017).
10
A. W. Leissa, Vibration of Shells (NASA, Washington, 1973), pp. 6-8.
11
W. Soedel, Vibration of Shells and Plates (Marcel Dekker, New York, 1993), pp. 135-138.
12
S. H. Kim, “Beat map drawing method of bell type structures and beat maps of King Seongdeok Divine Bell” (in Korean), Trans. of KSNVE 13, 626-636 (2003).
13
S. H. Kim, C. W. Lee, and J. M. Lee, “Beat characteri-stics and beat maps of the King Seong-deok Divine Bell,” J. Sound Vib. 281, 21-44 (2005).
14
S. H. An, Y. J. Kang, S. H. Kim, and S. Y. Park, “Analysis on the acoustic beat of a slightly asymmetric cylindrical shell” (in Korean), J. Acoust. Soc. Kr. 27, 183-190 (2008).
15
H. G. Park, S. H. Kim, and Y. J. Kang, “Analytical method of beat tuning in a slightly asymmetric ring,” J. Mech. Sci. Tech. 21, 1226-1234 (2007).
16
H. G. Park, Y. J. Kang, and S. H. Kim, “Dual mode tuning strategy of a slightly asymmetric ring,” J. Acout. Soc. Am. 123, 1383-1391 (2008).
17
H. G. Park, J. M. Lee, Y. J. Kang, and S. H. Kim, “A study on the mode pair of a slightly asymmetric circular ring with multiple deviations,” J. Sound Vib. 310, 366-380 (2008).
18
S. H. Kim and J. H. Lee, “Beat period tuning method using an equivalent bell model” (in Korean), J. Acoust. Soc. Kr. 31, 561-568 (2012).
Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 36
  • No :3
  • Pages :194-201
  • Received Date : 2017-03-28
  • Accepted Date : 2017-05-30
  • DOI :https://doi.org/10.7776/2017.36.3.194
Journal Informaiton The Journal of the Acoustical Society of Korea The Journal of the Acoustical Society of Korea
E-Book
  • scopus_JASK
  • ESCI_JASK
  • Google scholar_JASK
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • ccl
Journal Informaiton Journal Informaiton - close