Accession Number:

AD0780499

Title:

Estimations of the Effect of Design Changes on the Modes and Frequencies of Vibrating Structural Elements.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s):

• Taylor,Edward G.

Report Date:

1974-03-01

Pagination or Media Count:

82.0

Abstract:

As the state description of a structural system changes, the eigenvalues and eigenfunctions may also change. The paper derives expressions for the rates of change of these characteristic quantities for continuous systems. These derivatives can be used in a Taylor series to predict values for perturbed designs. Normally a series of approximation is valid within some narrow neighborhood of the initial or known state. An iterative technique is developed which reduces this restriction. The field of structural optimization has achieved greater importance as more is demanded of designs. Least mass solutions are obtained for the sandwich and solid rectangular beams. The problem of optimizing an Euler column is also examined. Modified author abstract

Descriptors:

• *STRUCTURAL COMPONENTS
• *VIBRATION
• FLUTTER
• BUCKLING
• BOUNDARY VALUE PROBLEMS
• COMPUTATIONS
• THESES

Subject Categories:

• Aircraft
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE