Active and Reactive Shells
Abstract
Active Shells (AS) and Reactive Shells (RS) are proposed to attenuate the undesirable wave propagation developed by various sources of external excitations. Emphasis will be placed here on excitations resulting from moving ballistic pressures that are developed during the firing of projectiles in gun barrels. The proposed shells are envisioned to be made of tubes that have passive or active sources of mechanical impedance mismatch which are placed along their longitudinal axes. These sources can be active inserts or reactive stiffeners that are tuned for optimal performance. The geometrical parameters and location of the active inserts or the reactive stiffeners will be optimally determined to maximize the attenuation of the waves as they propagate from one end of the shells to the other. Such attenuation results from the proper interaction between the incident, reflected and transmitted waves at the zones of impedance mismatch in a way similar to what happens in reactive mufflers of passengers cars. The development and the optimization of the RS model and RS will be carried out and the performance of the optimal configurations will be tested at the University of Maryland. The performance of prototypes of the successful configurations will be evaluated at the firing range of the U. S. Army Benet Laboratory in Watervliet Arsenal.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 14, 2002
- Accession Number
- ADA412268
Entities
People
- Amr M. Baz
Organizations
- University of Maryland