Large Scale Vehicle LSV
The Large Scale Vehicle Kokanee (LSV-I) is operated by the Acoustic Research Detachment (ARD) for the Naval Sea Systems Command (SEA 92R). Kokanee is a one-quarter scale model of the Seawolf (SSN-21). She is an unmanned, battery-powered, free-running model, 90 feet long, 150 tons, with batteries weighing approximately 25 tons and requiring special, high- powered battery chargers. This large-scale structural model was delivered to Bayview in north Idaho in November 1987 and operated in Lake Pend Oreille for research work.
Lake Pend Oreille provides a deep (1150 ft), quiet body of water where a free-field ocean-like environment is available without the attendant problems and costs of open ocean operations. Unique experimental hardware and floating platforms have been developed to support a wide variety of R&D programs ranging from the measurement of flow induced boundary layer fluctuations on sonar domes to the calibrations of full-scale surface ship sonar transducers. The site's technical programs typically support analytical efforts at the NSWCCD and contribute to the development of advanced submarine and sonar designs.
In 1967, the first large-scale submarine model was sent to Lake Pend Oreille and ARD began to play an increasingly important role in submarine silencing. This model, named Kamloops after a trout indigenous to Lake Pend Oreille, is a quarter-scale version of the Sturgeon (SSN 637) class submarine. The buoyantly propelled vehicle 'Kamloops' supported hydrodynamic flow noise testing. The Kamloops vehicle is a free-rising, unpowered, unmanned model, which provides data for the control of flow-induced self-noise levels at high speeds. Kamloops was used to tested hull, bow, stern, and sail target strength coatings, GRP sonar dome designs, internal treatments (damping) for flow noise mitigation, main ballast tank floodport designs, bow plane seal designs, baffle designs, and torpedo shutter door seal designs. Success with Kamloops led to introduction of the Large Scale Vehicle (LSV) Kokanee.
The Advanced Submarine Technology Development program enhances the capability of the Large Scale Demonstrator System to conduct hydrodynamic/hydroacoustic/flow management/maneuvering tests, as well as development of an advanced propulsion system and sensor & processing technologies being considered for insertion in the New Attack Submarine.
In November 1999 the Advanced Sail was installed on LSV. Changes to the LSV due to the new sail were quantified with a trim verification dive and an inclining experiment. The results indicated all changes to LSV's weight, moment and BG (center of bouyancy minus center of gravity) were exactly as predicted. The first Advanced Sail underway was scheduled for 17 November 1999. This underway was designed to compress sail components for final torque of attachment bolts and the installation of coatings over those bolts. The crew will tested sail pressure sensors at various depths.
Congress authorized the Secretary of the Navy to pursue a new Large-Scale Vehicle (LSV II) demonstrator that is not limited by form or single hull design. In January 1997 the Naval Sea Systems Command contracted with Newport News Shipbuilding (NNS), for the design and construction of an Advanced Large Scale Vehicle (LSV II). These efforts include all engineering, technical, coordination, support and manufacturing efforts necessary to design and construct LSV II. LSV II will replicate large scale submarines in design and capability and is to be used as a demonstration platform for the insertion of new submarine technologies related to deep diving, nuclear powered attack submarines. It is envisioned that NNS will team, via a subcontract, with Electric Boat Corporation for some of these requirements.
LSV II Cutthroat, a quarter-scale version of the upcoming Virginia class New Attack Submarine (NSSN), will be the world's largest underwater autonomous submarine vehicle. At 111 feet long, the Cutthroat is half the size of a World War II submarine. Cutthroat is to be about 24 feet longer than Kokanee to resemble the hull shape of the Virginia and is to be quieter than Kokanee.
CUTTHROAT represents a significant improvement in reconfigurability, quieting, and maneuvering. The modular design of CUTTHROAT provides planned separation points in the vehicle structure to facilitate reconfiguration of the vehicle. The acoustic stealth characteristics of CUTTHROAT are invaluable to technology development. CUTTHROAT provides the Navy a unique capability to conduct large-scale hydrodynamic experiments, including highly instrumented maneuvering and recoverability testing. Appendages such as the sail, dihedrals, and control surfaces are instrumented with dynamometers supporting critical data acquisition. A unique partnering agreement with industry provides a contractor developed and owned permanent magnet motor for electric drive main propulsion. At delivery, CUTTHROAT will have a 3,000 shaft horsepower (shp) plant coupled with a state-of-the-art electronic motor controller, expandable to 6,000 shp with additional motor controller modules. Other advanced technologies on CUTTHROAT include electro-mechanical hydraulic actuators in the steering and diving system, positive flood port closures, and several other acoustic quieting measures.
LSV II Cutthroat was used as a demonstrator vehicle for the advanced technologies anticipated for the submarine. After delivery in 2001, the LSV-2 operated on Lake Pend Oreille at the Acoustic Research Detachment in Bayview, Idaho. On 12 February 1999 Newport News Shipbuilding was awarded a $46,868,246 cost-plus-incentive-fee contract for the completion of design and construction of the submarine large scale vehicle CUTTHROAT (LSV 2). Work will be performed in Newport News, Va. (40%); Groton, Conn. (35%), and at numerous undetermined sites throughout the United States (25%), and was expected to be completed by May 2001. This contract was not competitively procured. p>Newport News Shipbuilding, the prime contractor, teamed with Electric Boat Corporation to build and design CUTTHROAT for the Naval Sea Systems Command. The same team built the first submarine of the VIRGINIA Class, with Electric Boat serving as the prime contractor. Other CUTTHROAT team members include GNB Technologies (propulsion batteries), Naval Surface Warfare Center (Onboard Data Acquisition System), Lockheed Martin (Guidance, Navigation, and Control System), Vehicle Control Technologies (Guidance, Navigation, and Control System), Allied Signal (Electro-Mechanical Hydraulic Actuators), and Eaton (Electric Drive Control System).
LSV 2 Cutthroat provided submarine design engineers a platform to test advanced submarine technologies. Cutthroat, a 205-ton, large scale submarine test vehicle, will be used to affordably explore and test emerging technologies and to conduct physics-based experiments. Specific emphasis will be on stealth, hydrodynamics, hydroacoustics and propulsion designs to permit technology insertion into current and future submarines. The LSV 2 provided the capability to develop and evaluate the effectiveness of new technologies that will result in major improvements in performance for the U.S. Navy's new attack submarine, USS Virginia (SSN 774). The LSV 2 was designed and built by an industry team from Newport News Shipbuilding and General Dynamics/Electric Boat Company under contract from Naval Sea Systems Command (NAVSEA).
In achieving a quieter and more maneuverable test platform for the next century, Cutthroat applied advanced electric drive technologies and a unique partnering agreement with industry to field he latest in permanent magnet propulsion motor and motor drive systems. High data rate sensor recording enabled improved hydrodynamic experimentation. Advancements in control surface actuation and ballast tank solid port closure systems will be demonstrated. The auto-pilot and guidance and navigation control systems were the most sophisticated of its kind.
The facility is operated by the Naval Surface Warfare Center's Carderock Division. Cutthroat, named after a native Idaho trout, was named in 1997 after a selection process by nearby Athol Elementary School. The Navy asked the school to decide on a name from a list of indigenous Idaho fish. Many of these students attended the keel-laying in October 1997 and signed their names on the hull during the November 2000 ceremony.
|Join the GlobalSecurity.org mailing list|