SOME IMPROVEMENTS IN THE FLEXURAL DAMPING MEASUREMENT TECHNIQUE Conference Paper

abstract

• Some of the most popular flexural damping apparatuses use the well-known cantilevered beam method. However, these apparatuses suffer from a major disadvantage: some energy is always lost in the grips leading to a systematic error in the measured value of damping. Another popular damping apparatus uses a free-free beam suspended at its nodes by two strings. Since it is virtually impossible to find the exact location of the nodes, some energy is inevitably lost in the vibration of the strings, leading once again to a systematic error in the measured value of damping. Historically, specific damping capacity () values have been reported with an accuracy = O(10-3). Here W/W, where W is the energy dissipated per cycle, and W is the maximum elastic stored energy. In this paper, we report some simple experimental procedures for improving the measurement accuracy by one order of magnitude. We will show that either the cantilevered beam or the free-free beam can be used to measure the specific damping capacity to an accuracy of = O(10-4).

authors

• Kinra, Vikram

published proceedings

• M3D : MECHANICS AND MECHANISMS OF MATERIAL DAMPING

author list (cited authors)

• BISHOP, J. E., & KINRA, V. K.

citation count

• 19

complete list of authors

• BISHOP, JE||KINRA, VK

publication date

• January 1992

publisher

• ASTM International  Publisher

published in

• n1040-3094ISSN  Journal

keywords

• Cantilevered Beam
• End-mass
• Flexural Damping
• Free-free Beam
• Internal Friction
• Internal Stress
• Material Damping
• Mechanical Properties
• Specific Damping Capacity

Digital Object Identifier (DOI)

• 10.1520/STP17978S

International Standard Book Number (ISBN) 10

• 0-8031-1495-8

start page

• 457

end page

• 470

volume

• 1169

issue

• 1169

URL

• http://dx.doi.org/10.1520/stp17978s