Accession Number : AD0782320

Title :   Materials Approaches to Ship Silencing.

Descriptive Note : Annual rept. (Final) 1 Jul 73-30 Apr 74,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Perkins,Jeff ; Edwards,Glen R. ; Hills,Norman A.

Report Date : JUN 1974

Pagination or Media Count : 63

Abstract : A survey of high-damping materials shows that two basic alloy systems, Ni-Ti and Cu=Mn, currently have been developed to the point of commercial availability and general engineering attractiveness. Alloys from both systems have the potential of wide application for noise/vibration reduction. The damping capacity of these 'quiet metals' is so unusually high that new methods of design integration for noise reduction should be developed. The NPS research program in FY 74 has concentrated on the characterization of metallurgical factors (such as stress, deformation, and aging) affecting damping capacity in Cu-Mn-base alloys, and has studied the control of damping properties through thermomechanical processing. The program has also evaluated the effectiveness of various techniques to measure damping properties in high-damping alloys; torsion pendulum, resonant bar, and ultrasonic pulse-echo methods have been examined. (Author)

Descriptors :   *Noise reduction, *Ship noise, Vibration, Damping, Copper alloys, Manganese alloys, Nickel alloys, Titanium alloys, Stresses, Deformation, Aging(Materials), Thermomechanics, Submarines

Subject Categories : Metallurgy and Metallography
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE