The Effect of Source Impedance on Damping Measurements Using Resonance Dwell Testing

Item

Title
The Effect of Source Impedance on Damping Measurements Using Resonance Dwell Testing
Report Number
WL-TR-91-3078 Volume III, p. IBA-1 thru IBA-14
Creator
Tate, Ralph E.
Corporate Author
LTV Aircraft Products Group
Date
1991
Date Issued
1991-08
Extent
14
Identifier
ADA241313
Format
1 online resource
Abstract
J.C. Heine developed a test methodology for evaluating the damping in various materials, particularly metals. LTV
employs a resonance dwell technique adapted from that of J.C. Heine, which facilitates the use of a smaller shaker
from that normally required. This test apparatus permits
the rapid characterization of viscoelastic laminates not
only for damping, but also for vibroacoustical fatigue resistence. During check-out of the modified apparatus, it was found that the behavior of damped specimens differed markedly from prior results. That is, significantly higher values of damping were observed regardless of measurement technique. The author demonstrates, through the use of impedance modeling techniques, that the differences arise from the coupling the specimen to the electrodynamics of the excitation source. A refinement of the test procedure is outlined to remedy the data anomaly and a discussion of the impact on the interpretation of damping data naturally follows.
Description
J.C. Heine developed a test methodology for evaluating the damping in various materials, particularly metals. LTV
employs a resonance dwell technique adapted from that of J.C. Heine, which facilitates the use of a smaller shaker
from that normally required. This test apparatus permits
the rapid characterization of viscoelastic laminates not
only for damping, but also for vibroacoustical fatigue resistence. During check-out of the modified apparatus, it was found that the behavior of damped specimens differed markedly from prior results. That is, significantly higher values of damping were observed regardless of measurement technique. The author demonstrates, through the use of impedance modeling techniques, that the differences arise from the coupling the specimen to the electrodynamics of the excitation source. A refinement of the test procedure is outlined to remedy the data anomaly and a discussion of the impact on the interpretation of damping data naturally follows.
Distribution Classification
1
Distribution Conflict
No
DTIC Record Exists
No
Illinois Tech Related
No
Photo Quality
Not Needed
Report Availability
Full text available
Type
article
Is Part Of
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)
Media
articleIBA

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Items with "Has Part: The Effect of Source Impedance on Damping Measurements Using Resonance Dwell Testing"
Title Class
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)