A simple rotational pendulum method to measure the radii of gyration or mass moments of inertia of a rotor and other assemblies

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Description

In mechanical dynamic problems, it is often necessary to know the radii of gyration or equivalent mass moments of inertia of components and assemblies. Using the rotational pendulum technique described, one can easily measure the radii of gyration about the polar and diametric axes of any rigid rotor without requiring a special fixture. The principals employed are also applicable to more complicated assemblies such as aircraft, boats, and cars, where the radius of gyration and vehicle maneuverability are of interest. This description focuses on rotors. The relative values of polar and diametric radii of gyration characterize some dynamic behavior and ... continued below

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8 p.

Creation Information

Andriulli, J.B. January 1, 1997.

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Description

In mechanical dynamic problems, it is often necessary to know the radii of gyration or equivalent mass moments of inertia of components and assemblies. Using the rotational pendulum technique described, one can easily measure the radii of gyration about the polar and diametric axes of any rigid rotor without requiring a special fixture. The principals employed are also applicable to more complicated assemblies such as aircraft, boats, and cars, where the radius of gyration and vehicle maneuverability are of interest. This description focuses on rotors. The relative values of polar and diametric radii of gyration characterize some dynamic behavior and stability of spinning rotors. When the ratio of polar to diametric radii of gyration approaches unity, the spinning rotor may exhibit undesirable dynamic behavior. Consequently, prior to high-speed spin testing the rotor or otherwise operating the assembly, it is desirable to have a simple and inexpensive procedure to directly measure the radii of gyration of existing hardware. These data permit the technician to estimate the rotor dynamic behavior or identify potential problems prior to committing to operation. If sufficient part information is available, such as dimensions, geometry and material density, one can calculate the radii of gyration. For complicated parts, this can be time consuming. Often the technician does not have access to the rotor`s dimensional details to make the calculations. Hence, an inexpensive empirical technique such as the one described is valuable.

Physical Description

8 p.

Notes

OSTI as DE97001634

Source

  • Other Information: PBD: [1997]

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  • Other: DE97001634
  • Report No.: ORNL/TM--13339
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/416947 | External Link
  • Office of Scientific & Technical Information Report Number: 416947
  • Archival Resource Key: ark:/67531/metadc677697

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Creation Date

  • January 1, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Jan. 21, 2016, 12:14 p.m.

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Andriulli, J.B. A simple rotational pendulum method to measure the radii of gyration or mass moments of inertia of a rotor and other assemblies, report, January 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc677697/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.