Présidents de session
JISFA 5 / Noise and Vibration of Spacecrafts
- Leonardo Sanches ()
In order to protect the payload and the rocket structure from severe vibrations, water injection is widely used on launch pads to reduce the high noise level radiated by booster exhausts at lift-off. If this technique appears to be effective, it remains that the physics of the phenomena associated with the noise reduction of hot supersonic turbulent jets is poorly known, making the...
During the lift-off phase of a space launcher, rocket motors generate harsh acoustic environment that is a concern for the payload and surrounding structures. Hot supersonic jets contribute to the emitted noise from both their own noise production mechanisms and their interactions with launch pad components, such as the launch table and flame trenches.
The present work describes the results of...
An Acoustic Black Hole (ABH) is a passive technique for vibration reduction without adding mass. It usually consists of a thickness gradient following a parabolic thickness profile, inserted in a thin structure such as a beam or plate. This geometric inhomogeneity, combined with the addition of a viscoelastic thin layer, leads to a localization effect and a particularly efficient damping of...
Satellite structures face a significant challenge in dissipating vibratory energy during launch loads. Currently, modal damping is commonly used to address this issue, although it is quite far from representing the actual physical dissipation mechanism. Various sources contribute to dissipation, including intrinsic material properties, joint interfaces, and fluid-structure coupling. However,...
