Accession Number:

ADA055503

Title:

Vulnerability of Surface Effect Vehicles to Explosion Generated Water Waves.

Descriptive Note:

Final rept.,

Corporate Author:

TETRA TECH INC PASADENA CALIF

Personal Author(s):

Report Date:

1977-12-01

Pagination or Media Count:

180.0

Abstract:

The objectives of the study are to develop a mathematical model appropriate for analysis of the behavior of surface effect vehicles SEV in unusually large waves and subsequently to apply this model to investigate the vulnerability of these vehicles to explosion generated waves. The generation of surface waves due to an explosion is modeled mathematically as a function of the explosive yield, detonation depth and water depth. Further, the dynamic property of the propagated waves is treated to vary with the local water depth. The SEV dynamics are modeled mathematically by considering the vehicle as a rigid body having six degrees of freedom in space subject to an appropriate constraint derived from the cushion air dynamics as well as to the environmental excitations due to waves. Non-linear contributions including effects due to large motions, viscous flows, and control logics are considered and vehicle responses are solved numerically through time domain simulations. Analyses have been conducted using this analytical model to examine the potential threat of underwater explosions to a typical 2000-ton class SES, and the operational envelopes for such a vehicle in explosion generated wave enviornments are developed and discussed.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Surface Effect Vehicles and Amphibious Vehicles
  • Explosions
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE