Random Vibration of Space Shuttle Weather Protection Systems

Abstract

The article deals with random vibrations of the space shuttle weather protection systems. The excitation model represents a fit to the measured experimental data. The cross-spectral density is given as a convex combination of three exponential functions. It is shown that for the type of loading considered, the Bernoulli-Euler theory cannot be used as a simplified approach, and the structure will be more properly modeled as a Timoshenko beam. Use of the simple Bernoulli-Euler theory may result in an error of about 50% in determining the mean-square value of the bending moment in the weather protection system.

Vibration Fracture Mechanism and Optimization Design of Array Power Supply for Near-Space SAR

“…e most obvious characteristic of random vibration is nonperiodic. In recent years, considerable efforts have been focused on the aspects of theoretical model, experiment, simulation, and shock absorption for the random vibration [20][21][22][23]. On the theoretical side, Dzenis and Saunders [24] set up a mathematical model which can be used for the development of mechanism-based predictive models of fracture and life.…”