COMMANDING OFFICER, ATTN NAVFAC CONTRACTS OFFICE CODE 27, NCBC 1000 23RD AVE, PORT HUENEME CA 93043-4301

A -- CRANE FATIGUE ASSESSMENT USING ACOUSTIC EMISSIONS TECHNOLOGY SOL N47408-96-R-6317 DUE 032696 POC Contract Specialist, LORIETA V. MENDEZ, Code 27117, 805-982-5614 Perform laboratory and field testing to demonstrate the feasibility of using acoustic emissions technology to detect and locate fatigue cracks in a truss type crane boom and in the main hoist dual pinion drive shaft. Develop a test procedure and demonstrate the feasibility of this technology by performing a full scale test on a large Navy shipyard portal crane and prepare a comprehensive report describing the test procedures and the field demonstration test results. The test procedure shall describe the method to be used to simulate the fatigue crack, the type and number of sensors to be used in each test sequence, the method of sensor attachment, signal analysis techniques, criteria for determining that acoustic emissions from the simulator have been detected, and safety procedures. The testing will be performed on a rail mounted portal crane located at the Long Beach Naval Shipyard, Long Beach, CA. The crane will have the following characteristics: 50 ton capacity; truss type boom; boom length, 103 feet from boom pin to main block; height of boom pin, 35 feet above ground.(0033)

Loren Data Corp. http://www.ld.com (SYN# 0004 19960205\A-0004.SOL)