QUALITATIVE BEHAVIOR OF EIGENFREQUENCIES FOR FREE VIBRATION OF AEROSPACE VEHICLE APPENDAGES

Document Type : Original Article

Authors

1 Chairman Department of Mechanics and Elasticity, Military Technical College, Cairo, Egypt.

2 Professor of Engineering Mechanics. University of Wisconsin-Madison-U.S.A.

Abstract

In this work, the changes in eigenfrequencies of flexible appendages with • :various mass ratios of space vehicles due to the allowance of a rigid body. motion are studied. These changes are governed by the difference eigen-value problem [2] which is formulated in terms of the generated effective :mass and stiffness matrices. The computation techniques for calculating .
• the upper and lower bounds of the dominant eigenfrequencies are performed :
by the utilization of the bound formula approach [1] . An example of the transverse vibration analysis of the fuslage-wing combination with diff-
erent mass ratios in different zones of vibratory motion is solved . A :
'comparison between the computed calculations and previously published re-sults [0] is presented