Directional characteristics of two gamelan gongs

Samuel D. Bellows, Dallin T. Harwood, Kent L. Gee, Micah R. Shepherd

Research output: Contribution to journalArticlepeer-review

Abstract

The distinctive geometry and structural characteristics of Balinese gamelan gongs lead to the instrument's unique sound and musical style. This work presents high-resolution directivity measurements of two types of gamelan gongs to quantify and better understand their acoustic behavior. The measured instruments' structural modes clearly impact their far-field directivity patterns, with the number of directional lobes corresponding to the associated structural mode shapes. Many of the lowest modes produce dipole-like radiation, with the dipole moment determined by the positions of the nodal and antinodal regions. Higher modes exhibit more complex patterns with multiple lobes often correlated with the location and number of antinodal regions on the gong's edge. Directivity indices correspond to dipole radiation at low frequencies and quadrupole radiation at intermediate and higher frequencies. Symmetry analysis confirms that the gong's rim significantly impacts the resultant directivity.

Original languageEnglish (US)
Pages (from-to)1921-1931
Number of pages11
JournalJournal of the Acoustical Society of America
Volume154
Issue number3
DOIs
StatePublished - Sep 1 2023

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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