This standard presents information and calculation methods for the mass elastic properties and other characteristics of flexible couplings. This data is of importance to system designers for the selection of system components and natural frequency calculations. Calculation methods of the properties of the coupling flexible elements are not included in this standard. Due to the diversity of coupling types, this standard presents generally accepted practices rather than rigorous engineering analysis. Some characteristics are not covered in this standard, such as coupling balance which is covered in ANSI/AGMA 9000-C90, Flexible Couplings - Potential Unbalance Classification.
[The foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of ANSI/AGMA Standard 9004-B08, Flexible Couplings - Mass Elastic Properties and Other Characteristics.]
This standard was developed through intensive study of existing practices, standards, text books and literature. The intent of this standard is to offer to rotating equipment designers, builders and users, a standard for design practice and methods of calculation of certain physical and mass elastic properties of flexible couplings. In general, the information in this standard is a consolidation of the most common practices and calculations currently in use by the flexible coupling manufacturers, rotating equipment designers and users.
This AGMA standard utilizes the physical dimensions and properties of the coupling or coupling components for the calculation methods presented. This standard does not cover coupling characteristics that are covered in other AGMA flexible coupling standards, such as coupling balance, which is covered in ANSI/AGMA 9000-C90, Flexible Couplings - Potential Unbalance Classification.
Work was started on this standard in 1989 at the suggestion of the AGMA Flexible Coupling Committee. The purpose was to gain uniformity in the methods of calculation of some of the mass elastic properties of flexible couplings.
This revision of ANSI/AGMA 9004-A99 corrects errors in equation 6 (axial natural frequency) and equation 8 (floating shaft coupling with central weight, lateral natural frequency). It also corrects equations E.3 and E.4 in Annex E; reworks Annex G to reflect the changes made to equation 6 and adds a paragraph to Annex G that discusses the damped response to external forced vibration that was added to ANSI/AGMA 9104-A06 during its development. There were also minor editorial and clarification changes to the annexes.
The first draft of ANSI/AGMA 9004-B08 was made in October, 2004. It was approved by the AGMA Technical Division Executive Committee in August, 2008. ANSI/AGMA 9004-B08 was approved as a standard by the AGMA membership on September 30, 2008, and approved as an American National Standard on December 19, 2008.
Reaffirmed April 2020
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