A fast algorithm for the boundary element method is developed to handle problems in underwater acoustics. The algorithm employs the multipole and local expansions to approximate far-field potentials, and exploits the discrete convolution nature of mapping multipole to local expansions to accelerate the potential evaluation process. The ...
NASA Astrophysics Data System (ADS)
... HYDRODYNAMIC coE F'If-N TSOR UNDERWATER YEiJCLE$ *~.~ GEOMETRIC ... Coefficients for Underwater Vehicles( from Geometric Parameters ...
DTIC Science & Technology
... Descriptors : *SUBMARINES, WEAPONS, UNDERWATER TO SURFACE, GUIDED MISSILES. Subject Categories : SUBMARINE ENGINEERING ...
... to the modeling of underwater vehicles, which directly ... The DCC, employing onboard vehicle sensors, allows ... Harbor using the NPS Phoenix AUV. ...
... Underwater Vehicles (AUJV) has arisen. ... and launch, subsequent vehicle recovery, and data ... AUV vehicles now in design or production can employ ...
Design and operation of an underwater saw for remotely cutting cortrol roda in the Experimental Boiling Water Reactor are discussed. A commercially available portable reciprocating unit was employed. (R.J.S.)
Energy Citations Database
Acceleration of the Aging Process by Oxygen. The frequent use of artificial atmospheres for underwater activities as well as for the purposes of ...
NASA Website
... Descriptors : *SEATS, *SHIPS, *MANNEQUINS, *UNDERWATER EXPLOSIONS, RESPONSE, IMPACT ACCELERATION, VALUE, BIODYNAMICS ...
... which was written by the Woods Hole Oceanographic ... lights aft, narrowing of the beam patterns, and ... that employs scanning light beams in concert ...
... employs a barium titanate crystal cylinder as a sensitive element and ... aa a small,, sturdy, cheap substitute for preasure gradient detector*. ...
This study deals with investigating the feasibility of an underwater glider capable of carrying cargo for long distances by alternately employing gravity and buoyancy forces for forward propulsion. The parameters controlling the vessel design, stability and control are investigated.
This report documents the results of a non-linear, elastic-plastic, structural response analysis of a missile launch tube to underwater shock. The analysis was performed with the structural response code USA-STAGS. This code employs the finite element met...
National Technical Information Service (NTIS)
The patent application describes a system for tracking with high precision the movement of an underwater object having a sound detecting capability. It employs three bottom-moored acoustic signal sources which are generally disposed in a triangular patter...
This invention relates to an underwater acoustic imaging system for use in controlled environments such as acoustic test facilities. More specifically it employs a single fixed hydrophone receiver location and a rotated target to greatly reduce the amount...
An operational study has been made of algorithms employed in short base line underwater position location systems. Some important sources of systematic error have been uncovered. The issues studied include isospeed vs. isogradient ray tracing, effect of t...
... For depth, the hydroplane angle may affect the rate of hull compression ... rate-of-change variables rudder- angle, acceleration and hydro-plane angle ...
The focus of the work in this paper is the implementation of a distributed deconfliction algorithm for vehicles with constraints on velocity and acceleration. The algorithm was tested on two testbeds: a quadrotor system and an underwater vehicle system. T...
The purpose of this study was to develop a microcomputer-based acceleration logger device for the swimming stroke monitoring. The authors measured the swimmer's tri-axial wrist acceleration and applied this device for the fatigue evaluation of the swimmers. The experimental protocol led the swimmers exhausted after the crawl stroke interval training. Every ...
Underwater Explosions (UNDEX) can be modeled as a two-part process. The first part is the shock wave generated from the explosion, while the second part is the generation of a secondary-wave pressure pulse that is formed by the contraction of the gaseous products created by the explosion. The main contribution of this investigation to the theory of UNDEX is the full ...
... foraging behaviour of Brown Boobies underwater, we attached acceleration data loggers to chick-rearing Brown Boobies at ... Received: March 13, 2007; Accepted: October 10, 2007Keywords: Acceleration, Data...
NBII National Biological Information Infrastructure
This invention relates generally to turbojet engines and more particularly to such engines employing liquid as a motive flow medium. It is an important object of the present invention to provide an engine of the foregoing type which is more suitable for u...
... in exploiting autonomous vehicles for increasingly ... recent Autonomous Underwater Vehicle Festival (AUVFest ... The vehicle employed for simulation ...
... candidate propulsors for high speed underwater vehicles and, as a matter of fact, it has recently been employed for MK 48 torpedoes, ALWT ...
... The analysis is performed for rail gun accelerators. ... be considered as an Ohmic load for typical circuit parameters employed in many experiments. ...
This research was conducted to enhance understanding of the use of high explosives to simulate the effects of a nuclear underwater explosion. A review of the known characteristics of the nuclear, spherical conventional, and tapered conventional underwater pressure-time histories illustrates the selection of the tapered charge to simulate the ...
