Acoustics of the Korean percussion instruments pyeongyeong and pyeonjong Free

Pyeongyeong is a set of 16 L‐shaped chime stones and pyeonjong is a set of 16 oval chime bells. Vibrational mode shapes and mode frequencies of the pyeongyeong determined by holographic interferometry and by experimental modal testing agree very well with those calculated using finite‐element methods. A model of the pyeongyeong in which the geometry can be varied shows that the actual shape is probably the one that gave the preferred sound. Vibrational mode shapes and frequencies of the pyeonjong, also determined by holographic interferometry and by experimental modal testing, are split into doublets due to the oval shape of the bells. The splitting is less than in Chinese two‐tone bells but it gives rise to audible beats, as in large Korean temple bells.