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http://dx.doi.org/10.7776/ASK.2006.25.3.121

Vibrational Modes of Pyeongeong  

Yoo June-Hee (서울대학교 물리교육과)
Publication Information
The Journal of the Acoustical Society of Korea / v.25, no.3, 2006 , pp. 121-128 More about this Journal
Abstract
Korean pyeongyeong, a set of sixteen L-shape chime stones covering one and one third octaves, is a standard instrument in the Korean traditional court music. We analyze the vibrational mode frequencies in a pyeongyeong replica which is played at the National Center for Korean Traditional Performance Arts and pyeongyeong remains which are exhibited at King Sejong Memorial Museum. The modal shapes on the Whangjong, the 1st stone and Cheonghyurjong, the 16th stone mapped by scanning accelerometer, TV holography and STAR system. The nominal frequencies in pyeongyeong replica at the National Center for Korean Traditional Performance Arts increase linearly with the thickness of the stones and the tones are tuned in line with the musical scale of Sambunsonik. The sexagenary cycles on the pyeongyeong remains at King Sejong Memorial. which show the Year of product indirectly, are different each other and the tones are not tuned in scale. The relative frequency ratios of each modes on stones differ more than just-noticeable differences from those on the pyeongyeong replica. Modal shapes are same for the two stones regardless of the thickness.
Keywords
Pyeongyeong; Modal Frequency; Mode Frequency Ratio to the Fundamental Frequency; Modal Shape; TV Holography; Modal Test;
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