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This report chronicles the history and technology of the U.S. Navy's undersea tracking range developments, particularly the facilities at Keyport, Washington and at other sites in the Pacific Northwest. These developments, ongoing...
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This report chronicles the history and technology of the U.S. Navy's undersea tracking range developments, particularly the facilities at Keyport, Washington and at other sites in the Pacific Northwest. These developments, ongoing since the early 1900's, were driven by significant challenges in the testing & evaluation of torpedoes and ever more complex undersea weapons, as well as by notorious weapon failures during their use by the fleet. Nearly a century of invention and evolution of tracking range instrumentation is described, along with the differing concepts and techniques employed to acoustically track underwater objects.
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The objectives of this study were to develop a basic understanding of the release rate and subsequent fate and transport of munition constituent (MC) in water and in sediment. The ability to characterize, assess, and predict poten...
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The objectives of this study were to develop a basic understanding of the release rate and subsequent fate and transport of munition constituent (MC) in water and in sediment. The ability to characterize, assess, and predict potential MC source loading and distribution has significant implications for Department of Defense (DoD) and Department of Navy (DoN) range sustainability initiatives. DoD will gain critical information for making scientifically defensible risk management decisions about underwater ordnance leave-in-place (LIP) mitigation and blow-in-place (BIP) vs. removal options. In addition to explosive blast (safety) considerations, future regulatory emphasis will likely require an assessment of potential underwater ordnance contamination and mitigation efforts that could include water and sediment quality issues. A basic understanding of processes and governing factors for the release rate and fate/transport of MC in marine environment was developed. Predictive modeling capabilities were also developed for these processes, which will help DoD scientifically address the MC issues mentioned above. With the data developed from this study, DoD will be better equipped to make technically defensible managerial decisions for sites with underwater ordnance.
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摘要 :
The present invention, as disclosed and taught herein, comprises apparatus andmethod for an underwater turret system suitable for use on surface or underwater vessels. The turret system is housed in an underwater bay from which th...
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The present invention, as disclosed and taught herein, comprises apparatus andmethod for an underwater turret system suitable for use on surface or underwater vessels. The turret system is housed in an underwater bay from which the turret may be deployed and operated. After operational use the turret system is retracted into the bay whereupon the bay and the system are flushed with rinse water, evacuated and dried by passing drying air through the bay. In a preferred embodiment the turret is fitted with an underwater weapon and operated to attack underwater targets.
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The YFU-44 Deep Depth Test Facility is a converted LCU equipped and instrumented for underwater torpedo launchings, for underwater transducer tests, and for the study of ocean and target acoustic phenomena. Underwater tests may be...
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The YFU-44 Deep Depth Test Facility is a converted LCU equipped and instrumented for underwater torpedo launchings, for underwater transducer tests, and for the study of ocean and target acoustic phenomena. Underwater tests may be conducted at any depth down to 600 feet from a submersible frame lowered through a well in the ship. An air-conditioned room contains the necessary instrumentation for the acquisition, analysis, and recording of test data. If additional instrumentation is required, the vessel can provide facilities to accommodate a mobile van. The location of the equipment permanently installed aboard the vessel is shown.
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This report reviews, from the point of view of nonlinear acoustics, the propagation of pressure pulses due to small underwater explosions, such as those used in scattering experiments. We have concentrated our attention on the pea...
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This report reviews, from the point of view of nonlinear acoustics, the propagation of pressure pulses due to small underwater explosions, such as those used in scattering experiments. We have concentrated our attention on the peak-pressure region, as it is here that nonlinear effects are likely to appear. It has been found that for some values of the physical parameters, there are ranges where the nonlinear theory gives values for the peak pressure that are quite close to those predicted by the experimental, (W1/3/R)1.13 fit. This agreement is found for relatively strong pressure pulses. However, it is concluded that for typical charges used in scattering experiments, nonlinear effects must be negligible, except very near the charges. By implication, it is concluded that except for very close ranges where the shock front is too strong to be considered as a weak shock wave, the decay of the pressure peak in such pulses should be as predicted by linear acoustic theory. As this is not found experimentally, it is suggested that some effects may have been present in the experiments that are not represented by the empirical fit.
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A device for use as a muzzle brake for an underwater gun having a projectileconveying structure with concentric inner and outer cylinders. The inner cylinder has at least one longitudinal slot formed therein. A sealing means joins...
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A device for use as a muzzle brake for an underwater gun having a projectileconveying structure with concentric inner and outer cylinders. The inner cylinder has at least one longitudinal slot formed therein. A sealing means joins the projectile conveying structure to the underwater gun at the structure's first end. A second end of the structure is provided with a seal for closing the second end after a projectile is fired through it. A piston having an aperture therethrough is positioned inside the inner cylinder and is axially moveable therein adjacent the longitudinal slot. An actuator is positioned between the inner cylinder and the outer cylinder. Actuator links through the longitudinal slot connect the piston with the actuator. After a projectile is fired through the projectile conveying structure to displace the piston from its initial position, the actuator means returns the piston to that initial position to ready the device for reuse.
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Since 1946, researchers from the Institute for Dynamics of the Geospheres (IDG)took an active participation in equipment design and observations of nuclear explosions and associated test (modelling) experiments by using chemical e...
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Since 1946, researchers from the Institute for Dynamics of the Geospheres (IDG)took an active participation in equipment design and observations of nuclear explosions and associated test (modelling) experiments by using chemical explosives. In this report, experimental data of hydrodynamic processes in water related to underwater, above water and coastal explosions are presented, analyzed and generalized. The principal goal of this work is improving existing hydroacoustic methods of monitoring and identifying underwater and above water nuclear explosions.
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This report summarizes an effort carried out at the Naval Surface Warfare Center--Panama City Division (NSWC PCD) under SERDP funding to work towards resolving issues that affect sonar detection and classification/identification (...
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This report summarizes an effort carried out at the Naval Surface Warfare Center--Panama City Division (NSWC PCD) under SERDP funding to work towards resolving issues that affect sonar detection and classification/identification (C/ID) of underwater UXO using sonar. We leveraged on-going Navy sponsored sonar tests to collect data to further the model development and validation needed to keep sonar models and simulations such as PC SWAT and the more recent finite-element-based models up to date for UXO applications. This modeling capability and test data was then used both to build a database of sonar target signals useful for developing and evaluating C/ID algorithms that separate UXO from bottom clutter and to look for and understand target signatures that appear sufficiently unique for classification. While traditional C/ID based on target imaging remains an important tool, it is likely to be insufficient for small and/or buried UXO. Processing sonar target responses onto non-imaging spaces was investigated as a means to find physics-motivated clues like elastic wave signatures that don't require high resolution to provide high classification confidence. Classification analyses performed on target acoustic data collected in NSWC PCD's freshwater pond demonstrated the feasibility of class separating different targets using features derived from non-image representations of the target. Unlike image-based classification, this methodology was even shown capable of discriminating between targets of the same size and shape but different material composition.
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The 80-foot rotating test boom and circular water channel test facility permits dynamic testing of underwater propulsion devices, mounted in test vehicles and comparable in size to full scale torpedoes, at speeds above the maximum...
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The 80-foot rotating test boom and circular water channel test facility permits dynamic testing of underwater propulsion devices, mounted in test vehicles and comparable in size to full scale torpedoes, at speeds above the maximum of existing propeller driven torpedoes. Variable-speed power-drive of the boom is provided by means of a 250 hp induction motor, and a variable speed fluid drive. Provision was made for complete remote control of the boom and test units, and for electric transmission of all instrumentation to the 'ashore' control and observation room. The facility is complete in itself and permits high-speed long-duration tests of underwater propulsion devices. (Author)
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