Accession Number:

ADA230665

Title:

Damping of Layered Beams with Mixed Boundary Conditions

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1990-12-01

Pagination or Media Count:

86.0

Abstract:

For many years, viscoelastic materials have been used in damping treatments to control vibration. In order to optimize a damping treatment for maximum damping, a design engineer must be able to predict frequencies of vibration of damped normal modes and loss factors as a function of the design parameters. Theoretical models of layered beams have been developed, but to date, exact solutions have assumed boundary conditions to be the same for all layers. In this thesis, equations of motion for a damped, layered beam are solved for the longitudinal displacement of both elastic layers, as well as the lateral displacement of the composite beam. Test cases were run on a computer to verify the validity of the equations, and to compare results with previously published approximate methods. Results show that the software compares well with theory for cases in which simple theoretical solutions are available.

Subject Categories:

  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE