Underwater Explosion Modeling of an Energy Absorption System.
Abstract
The laboratory model was demonstrated with an explosion energy absorption system incorporating a flexible rubber diaphragm, filled with water, which inverts when subject to underwater explosion pressure. Explosion energy is dissipated in the work done in inverting the diaphragm and vertically accelerating the water. A small-scale model of an energy absorption tank was constructed and tested to allow examination of operational parameters fundamental to the energy absorption concept. A technique was developed to produce a range of explosion pressures to excite the energy absorption tank. The technique utilized high speed photography allowing visualization of the operational performance of a tank which has been subjected to an underwater explosion event. Flexible diaphragm inversion and water acceleration demonstrate distinct dynamic trends and are unsteady processes. The experimental results indicate that the dynamic trends characterizing these processes were repeatable in form over the range of explosion pressures. Forces obtained through this technique represent forces imparted to the tank through the resistance screens and top grate as impediments to water flow. Water flow impedance provided by a resistance screen was found to be a function of resistance element position within the tank. The magnitude and duration of the impedance forces could be changed through variation of the resistance element vertical configuration. The results of this investigation demonstrate the capabilities of this testing technique and small-scale laboratory model.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1986
- Accession Number
- ADA168880
Entities
People
- David D. Moran
- Martin J. Dipper