Accession Number : AD0615281

Title :   ANALYTICAL AND EXPERIMENTAL DETERMINATION OF THE NATURAL FREQUENCIES AND MODE SHAPES OF SKEW PLATES.

Descriptive Note : Master's thesis,

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

Personal Author(s) : Hester,Keete Lockett

Report Date : MAR 1965

Pagination or Media Count : 100

Abstract : The accuracies of equivalent mass matrices for a triangular and rectangular element based on linearly varying static displacements were tested in natural frequency and mode shapes calculations for a simply supported square plate. Accuracies for the fundamental frequency of a nine degree-of-freedom plate were found within 10%. A lumped mass matrix resulted in an accuracy within 0.5%. The lumped mass and triangular element mass matrix were extended to frequency calculations for 60, 45, and 30 degree simply supported skew plates, each with aspect ratios of 1, 1/2, and 1/3. Results were disappointing when compared to experimental frequencies. Too many inaccuracies existed in the experimental and analytical method. Photographs were taken of mode shapes. (Author)

Descriptors :   (*FLAT PLATE MODELS, VIBRATION), (*HARMONIC ANALYSIS, FLAT PLATE MODELS), SHEETS, MATRICES(MATHEMATICS), AEROELASTICITY, ELASTIC SHELLS, RECTANGULAR BODIES, NUMERICAL METHODS AND PROCEDURES, STRUCTURES

Distribution Statement : APPROVED FOR PUBLIC RELEASE