NSWC Carderock Division
Congressional & Public Affairs Office
9500 MacArthur Boulevard
West Bethesda, MD 20817-5700
Carderock is the Navy's center of excellence for ships and ship systems. For over 100 years, Carderock has helped preserve and enhance the nation's presence on and under the seas. Carderock is the full-spectrum research and development, test and evaluation, engineering, and Fleet support organization for the Navy's ships, submarine, military watercraft, and unmanned vehicles.
Carderock specializes in Ship Design & Integration; Environmental Quality Systems; Hull Forms & Propulsors; Structures and Materials; Signatures, Silencing Systems, and Susceptibility; Machinery Systems; and Vulnerability and Survivability Systems. The Division's expertise spans more than 40 disciplines, from electrical and mechanical engineering to computer engineering and physics.
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. Detachment personnel supporting the experiments form a versatile resident core of highly skilled labor. They work closely with transient project scientists, engineers and technicians from the Division and other Navy and private organizations, to plan and conduct operations on the lake.
The results obtained during past experiments have been extremely valuable to the Navy, especially in the area of submarine sonar dome development. Future plans include continuation of sonar dome development and submarine silencing and target strength reduction experiments using large-scaled models, as well as increased emphasis on propulsor noise reduction. The Large Scale Vehicle (LSV), a large-scale structural model of the SSN-21 Class submarine, which was delivered to Bayview in November 1987, is being used extensively in this research work. The site's technical programs typically support analytical efforts at the NSWCCD and contribute to the development of advanced submarine and sonar designs. These programs support the Fleet, Navy systems commands, and other defense agencies. The facilities also support private industry and research efforts of the United Kingdom.
Southeast Alaska Acoustic Measurement Facility Ketchikan, Alaska
The Southeast Alaska Acoustic Measurement Facility (SEAFAC) is the Navy’s only West Coast asset for making high fidelity passive acoustic signature measurements. SEAFAC includes directive line arrays, data collection and processing systems for real-time data analysis and signature evaluation.
As the Navy's primary acoustic engineering measurement facility in the Pacific, SEAFAC provides the capability to perform RDT&E evaluations to determine the sources of radiated acoustic noise, to assess vulnerability, and to develop quieting measures.
Located in Behm Canal near Ketchikan, Alaska, the facility provides an ideal ship acoustic measurement site characterized by low ambient noise and minimal noise interference. SEAFAC supports submarine operations over a full range of speeds and depths required for underway tests during acoustic trials. SEAFAC is also capable of supporting submarine target strength measurements.
The facility consists of a site to collect acoustic signatures of submerged submarines underway, and a unique site to measure acoustic signatures of motionless (static) submerged submarines with various onboard machinery secured or under unloaded operation. Acoustic signatures can be collected for a variety of speeds and operating conditions as the submarine transits back and forth between the dual bottom-mounted acoustic arrays. At the static site, suspension barges lower the submarine on cables and position it between measurement arrays to evaluate acoustic signatures of individual machinery components.
The Static Site can test vessels of all sizes and types moored or suspended between surface barges. Submarines for example are suspended at various depths from the surface barges between two underwater arrays and the ship's propulsion systems are secured. Surface ships could be put on shore power with ship power and propulsion systems secured. Test personnel then obtain unique measurements on individual pieces of equipment and machinery. The signal processing and in-water hardware were designed to easily accommodate a variety of sponsors and requirements.