Abstract
The development of an analysis for examining the nonlinear dynamic phenomena arising in the Space Shuttle orbiter tile/pad thermal protection system is presented. The tile/pad system consists of ceramic tiles bonded to the aluminum skin of the orbiter through a thin nylon felt pad. The pads are a soft nonlinear material which permits large strains and displays both hysteretic and nonlinear viscous damping. Application of the analysis to a square tile subjected to sinusoidal motion of the orbiter skin is presented and the following nonlinear dynamic phenomena are considered: highly distorted waveforms; amplitude-dependent resonant frequencies which initially decrease and then increase with increasing amplitude of motion; magnification of substrate motion, which is higher than would be expected in a similarly highly damped linear system; and classical parametric resonance instability.
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