Prediction and measurement of damping of a laminated beam with a constrained viscoelastic layer

Technical Report · Wed Feb 01 04:00:00 EST 1989

OSTI ID:6476619

Segalman, D J; Reamy, P

Analytic predictions for damped natural frequencies of a simple viscoelastic structure are compared with measured values. The structure studied is an aluminum channel incorporating a constrained layer of highly viscoelastic polymer. The predictive technique employs a general and systematic method for calculating damping and stiffness matrices using only measured material properties and structure geometry. These matrices are then used to predict the dynamic properties of the structure. This work constitutes the first step in the experimental verification of the analytic method. Future work will demonstrate and test some of the unique capabilities of the analytic method including the ability to predict even the complex modes of viscoelastic structures. The experimental and analytic results are in the form of frequency response functions, and the frequencies and damping of the natural modes. The natural frequencies agreed to within 5%, as expected, and the damping values agreed to within the uncertainty in the properties of the viscoelastic damping material. The measured and predicted mode shapes, as compared using the Modal Assurance Criterion (MAC), also agreed closely. Agreement between the predicted and measured response of the structure studied is very good, and indicating that the analytic technique used is a viable method for modeling viscoelastically damped structures. 10 refs., 6 figs., 6 tabs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6476619
• Report Number(s): SAND-88-2551; ON: DE89009002
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
99 GENERAL AND MISCELLANEOUS
990230 -- Mathematics & Mathematical Models-- (1987-1989)
ALUMINIUM
CALCULATION METHODS
DAMPING
ELASTICITY
ELEMENTS
FREQUENCY RESPONSE TESTING
MATRICES
MEASURING METHODS
MECHANICAL PROPERTIES
METALS
STRUCTURAL BEAMS
TENSILE PROPERTIES
TESTING