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ANSI/ASA S2.9

2008 Edition, June 13, 2008

Complete Document

American National Standard Parameters for Specifying Damping Properties of Materials and System Damping

Includes all amendments and changes through Reaffirmation Notice , June 13, 2018


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Product Details:

  • Revision: 2008 Edition, June 13, 2008
  • Published Date: June 13, 2018
  • Status: Active, Most Current
  • Document Language: English
  • Published By: Acoustical Society of America (ASA)
  • Page Count: 34
  • ANSI Approved: Yes
  • DoD Adopted: No

Description / Abstract:

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.