Measurement of viscoelastic properties from the vibration of a compliantly supported beam

Title
Measurement of viscoelastic properties from the vibration of a compliantly supported beam
Author
박준홍
Keywords
FLOOR IMPACT SOUNDS; FREQUENCY-DEPENDENCE; POLYMERS; MODULUS; PLATES; LAYER
Issue Date
2011-12
Publisher
Acoustical Society of America
Citation
Journal of the Acoustical Society of America, 2011, 130(6), P.3729-3735
Abstract
A laboratory method is presented by which the viscoelastic properties of compliant materials are measured over a wide frequency range. The test setup utilizes a flexible beam clamped at one end and excited by a shaker at the free end. A small specimen of a compliant material is positioned to support the beam near its midpoint. The deformation from gravity is minimized since the specimen is not loaded by an attached mass. Forced vibration responses measured at two locations along the beam are used to derive a transfer function from which the dynamic properties of compliant materials are directly determined by use of a theoretical procedure investigating the effects of specimen stiffness on the propagation of flexural waves. Sensitivity of the measured properties to experimental uncertainties is investigated. Young’s moduli and associated loss factors are determined for compliant materials ranging from low-density closed-cell foams to high-density damping materials. The method is validated by comparing the measured viscoelastic properties to those from an alternative dynamic test method.
URI
https://asa.scitation.org/doi/10.1121/1.3651867http://hdl.handle.net/20.500.11754/65865
ISSN
0001-4966
DOI
10.1121/1.3651867
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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