Date of Award
3-1995
Document Type
Thesis - Open Access
Degree Name
Master of Aerospace Engineering
Department
Graduate Studies
Committee Chair
Dr. Habib Eslami
Committee Member
Dr. Howard Curtiss
Committee Member
Dr. Frank Radosta
Abstract
The vibration responses of three unsymmetrically laminated beams, that are excited with a Gaussian random forcing function, are studied in this thesis. The beams are analyzed nonlinearly and compared to linear results, indicating some important corrections. The solution procedure begins with the derivation of the general equation of motion using Galerkin's method. Then, two approaches are taken in the solution. First, the equation of motion is attacked directly employing a real time Runge-Kutta numerical analysis. Second, the method of equivalent linearization is used. The thesis finds the results from the two approaches to be in a close agreement, although some discrepancies at high loads could be found. However, the most important achievement of the thesis is undoubtedly that the same response equation can be used for any type of laminate layup, and any of the three types of beams. One of many applications that the solution can be used for is the assessment of fatigue tolerances.
Scholarly Commons Citation
Gudmundsson, Snorri, "Nonlinear Analysis of Composite Beams under Random Excitations" (1995). Master's Theses - Daytona Beach. 280.
https://commons.erau.edu/db-theses/280
