Accession Number:

ADA010358

Title:

Noise Abatement and Internal Vibrational Absorption in Potential Structural Materials

Descriptive Note:

Semi-annual rept. 1 Sep 1974-1 Mar 1975

Corporate Author:

MANLABS INC CAMBRIDGE MA

Personal Author(s):

• Kaufman, L.
• Kulin, S. A.
• Neshe, P. P.

Report Date:

1975-03-01

Pagination or Media Count:

127.0

Abstract:

The goal of the study is identification of alloys which can reduce vibration and noise associated with the operation of devices containing rapidly moving components. The report summarizes the progress made during the past six- month period of an investigation of methods for achieving high internal damping in potential structural materials. The results presented, obtained in studies of Ni-Ti, Cu-Al-Ni and Fe-Pt alloys, illustrate how phase transformations can be employed to achieve high vibrational damping. In addition preliminary experiments on nickel and a cobalt nickel alloy show that magnetostrictive effects can be employed to produce enhanced acoustical absorption. Moreover, the initial results obtained with cobalt-iron alloys have produced very high damping behavior.

Descriptors:

• *MACHINERY NOISE
• *NOISE REDUCTION
• *STRUCTURES
• ALUMINUM ALLOYS
• COBALT ALLOYS
• COPPER ALLOYS
• DAMPING
• INTERNAL FRICTION
• IRON ALLOYS
• MATERIALS
• MODULUS OF ELASTICITY
• NICKEL ALLOYS
• STRUCTURAL MECHANICS
• TITANIUM ALLOYS
• TRANSFORMATIONS
• VIBRATION

Subject Categories:

• Metallurgy and Metallography
• Construction Equipment, Materials and Supplies
• Machinery and Tools

Distribution Statement:

APPROVED FOR PUBLIC RELEASE