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Acoustical classification of woods for string instruments.

Shigeru Yoshikawa1

  • 1Department of Acoustic Design, Faculty of Design, Kyushu University, Shiobaru, Minami-ku, Fukuoka, Japan.

The Journal of the Acoustical Society of America
|July 7, 2007
PubMed
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This study introduces new acoustic parameters to classify woods for musical instruments, distinguishing soundboards from frame boards. This classification aids in selecting optimal woods, even substitutes, for instrument construction.

Area of Science:

  • Acoustics
  • Materials Science
  • Musical Instrument Design

Background:

  • Stringed musical instruments utilize distinct wood types for soundboards (top plates) and frame boards (back and side plates).
  • Traditional wood selection relies on empirical knowledge, lacking a systematic classification of acoustical properties.
  • Understanding wood's acoustic behavior is crucial for optimizing instrument tonal quality and longevity.

Purpose of the Study:

  • To propose a novel classification scheme for wood acoustical properties.
  • To differentiate woods suitable for soundboards versus frame boards based on their acoustic characteristics.
  • To provide a reference for selecting substitute woods when traditional options are scarce.

Main Methods:

  • Introduction of the transmission parameter (propagation speed × Q value).

Related Experiment Videos

  • Introduction of the antivibration parameter (density / propagation speed).
  • Development of regression lines based on these parameters for traditional woods.

    • Main Results:

    • The proposed parameters effectively separate woods for soundboards and frame boards.
    • Two distinct regression lines highlight the different acoustic requirements for each wood type.
    • The classification system provides a quantitative basis for wood selection.

    Conclusions:

    • The new classification scheme offers a scientific approach to wood selection for stringed instruments.
    • The transmission and antivibration parameters serve as reliable indicators for wood suitability.
    • This framework facilitates the identification of alternative woods, ensuring instrument quality and availability.