The term "damping" as used in this Standard is restricted to those properties of a material that
are related to the process of cyclic energy dissipation during harmonic vibration. This definition
specifically excludes: energy transfer devices such as dynamic absorbers; external damping
processes such as viscous damping, air-damping, or acoustic radiation; and energy dissipation
during transient or random vibration.
This standard presents the preferred nomenclature (parameters, symbols, definitions, and
mathematical expressions) for specifying the damping properties of uniform materials and uniform
specimens, where "uniform" implies homogeneity on a macroscopic scale. For reference
purposes, certain non-standard damping parameters are discussed in Annex A. Also included is
a classification of damping test parameters (Annex B).
The primary purpose for this standard is to improve communications among the many
technological fields concerned with material damping.
ASA S2.9-2008 history
2008ASA S2.9-2008 Parameters for Specifying Damping Properties of Materials and System Damping
1976ASA S2.9-1976 Nomenclature for Specifying Damping Properties of Materials ASA 6-1976