COMMANDING OFFICER, NAVFAC CONTRACTS OFC BLDG 41 CODE 2711, NCBC 1000 23RD AVE, PORT HUENEME CA 93043-4301

A -- FATIGUE CRACKS IN NAVY SHIPYARD CRANE BOOM SOL AGR&&&95010068 DUE 062995 POC Procurement Assistant, Maria Nailat, 805-982-5092 RESEARCH AND DEVELOPMENT SOURCES SOUGHT FOR THE DETECTION AND LOCATION OF FATIGUE CRACKS IN NAVY SHIPYARD CRANE BOOM STRUCTURE AND ROTATING SHAFTS USING ACOUSTIC EMISSION TECHNOLOGY The Navy is conducting a market survey to identify protential sources for research and development associated with Acoustic Emissions (AE) technology to detect and locate fatigue cracks in large Navy shipyard cranes both in the boom tructure, and in the rotating drive shafts for the drum hoists and rotating gear. A typical Navy shipyard crane has a boom of approximately 100 foot in length and is constructed as a truss system. Demonstrated experience in the following areas is necessary; the use of AE to detect and locate fatigue cracks in a large structures, preferably cranes, the simulation of fatigue cracks in the laboratory using test coupons, and the writing of test specifications for AE tests on large structures in the field. Any prospective source should also have the expertise in AE technology to be able to develop methods to detect and locate fatigue cracks in rotating drive shafts given the ambient noise level normally present in machinery, be able to demonstrate this capability in the laboratory and in full scale on a large portal crane, and be able to prepare written test specifications to be used to conduct AE tests on rotating shafts in the field. In addition, the potential source should have; demonstrated experience in the filtering of inter- fering ambient noise from the AE signal and in the analysis of AE signals. Any available information along with any brochures or literature should be submitted to Maria Nailat, Code 271PA, NAVFAC Contracting Office, Bldg 41, CBC, 1000 23rd Avenue, Port Hueneme, CA 93043-4301 by 29 June 1995. This is not a request for proposals rather a request for information, and no contract will be awarded solely on the basis of the responses hereto, or any follow-up information subsequently solicited. No reimbursement for any costs will be made. reimbursement for any costs will be made. (0150)

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