B. DEVELOPMENT OF STANDARDS 



Standard measurement and analysis procedures are being developed to permit better 

 comparison with calculations and with data obtained on other ships. 



Norms of hull vibrations are being prepared to define specifications for tolerable vi- 

 bration levels for various classes of surface ships and submarines. For this purpose full- 

 scale test data on all newly constructed vessels are collected and characteristics which 

 contribute to ship vibration are classified. Vibration norms have been already established 

 for the following submarine classes: TANG, TANG (improved), GATO (converted), TENCH, 

 BALAO, BALAO (converted), SKIPJACK, GEORGE WASHINGTON, and THRESHER, and for 

 the experimental submarines: SEAWOLF, NAUTILUS, and ALBACORE. Work is continuing 

 to complete norms for all submarines, and plans are being developed to establish norms for 

 surface ships. 



C. DEVELOPMENT OF SPECIFICATIONS 



Work has been started to establish general ship specifications and to revise military 

 standards, to determine environmental vibration levels for the more sensitive equipment be- 

 ing developed for installation on specific ships. Existing hull vibration data have been cor- 

 related with existing MIL-STD requirements. After receipt of vibration data on the newest 

 nuclear ships, recommendations for revision of MIL-STD 167 will be submitted. 



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