Acoustics applications

Eynck, J. J. Characterisitics of Wave Guides Used To Evaluate Materials Intended for Underwater Acoustic Applications, Rubber Laboratory, San Franciso Bay Naval Shipyard Report 165-50,1967. 

Dash, S. M., D.C. Kenzakowski, and J.L. Papp. 2002. Progress in jet turbulence modehng for aero-acoustic applications. AIAA Paper No. 2002-2525. 

DMA provides materials scientists, pol5mer chemists, and design engineers with detailed information on the elastic and inelastic (plastic) deformation of materials, modulus, and damping (energy dissipation) properties of materials. The damping behavior of S5mthetic and natural mbbers is important in vibration and acoustic application, for example. 

Dwivedi, A., and R. Roseman. 2003. In-situ development and study of conducting polymer electrodes on PVDF substrates for electro-acoustic application of cochlear implants. Mat Res Soc Symp Proc 771 123. 

Natural barium sulphates (barytes) are inert and allow very high loadings fine-particle grades are preferred to increase the density of a plastics compound, while coarse particles are better for acoustic applications, especially in automobiles. 

This article covers the use of acoustics as a molecular probe of polymer structure and describes various acoustic applications of polymers. Enough theory and experimental details are given to make the presentation understandable, but the emphasis is on the experimental results for polymers. Most of the presentation is for small-amplitude waves in solid polymers. References to some speciaUzed topics are given (see also Mechanical properties Test Methods). 

R. N. Capps, Elastomeric Materials for Acoustical Applications, Naval Research Laboratory, Washington D.C., (1989). 

A 177 C curing modified epoxy, highly flow controlled foam adhesive for nacelle spectum and acoustical applications. Available in sheet form 15 - 60mls thick. 

ISO 9053, 1991. Acoustics—Materials for acoustical applications—Determination of airflow resistance. International Organization for Standardization. 

Practice for use of sealants in acoustical applications Specification for elastomeric joint sealants... 

Materials with specific properties that have been studied include acoustical absorbing and vibration damping materials. Various conventional elastomers, polyurethanes, and interpenetrating network polymers have been studied for such acoustical applications. In addition, polymers are being used in the design of new piezoelectric composite materials containing a ceramic phase. 

The classical approach to acoustic management in the floor (and other) modules has relied on a sandwich of low density and highly filled, high-density materials that imposed a substantial weight burden. The rapid rise in fuel prices in North America (2000-2001) drove the development of alternative lightweight combinations for both floor (and headliner) acoustic applications. In floor systems, these lightweight acoustic barriers are likely to find application in combination with both carpet and noncarpet surfacings. 

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