Pressure Oscillations and Structural Vibrations in Space Shuttle RSRM and ETM-3 Motors

摘要

The complex interactions between internal motor pressure oscillations resulting from vortex shedding, the motors internal acoustic modes, and the motors structural vibration modes were assessed for the Space Shuttle four-segment booster Reusable Solid Rocket Motor and for the five-segment engineering test motor ETM-3. Two approaches were applied (1) a predictive procedure based on numerically solving modal representations of a solid rocket motors acoustic equations of motion and (2) a computational fluid dynamics two-dimensional axi-symmetric large eddy simulation at discrete motor burn times.