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ORIGINATOR

UNCLASSIFIED SEClJRJTY CLASSIFICATION OF FORM

(h1ghest classificatiOn of T11le. Abstract, Keywords)

DOCUMENT CONTROL DATA (Secunty classtficatJOn of utle body of abstract and mdexmg annotat1on must be entered when the overall document ts dasstfied)

(the name and address of the organ1zat1on prepanng the document 2 SECURITY CLASSIFICATION Orgamzat10ns for whom the document -..as prepared, e g Establishment sponsonng (overall secunty class•ficat10n of the document a contractor's report, or taskmg agency, are entered m secllon 8) mcludmg spec1al wammg terms 1f applicable)

Guigne International Limited 685 St. Thomas Line Paradise, Newfoundland AIL lCl Unclassified

TilLE (the complete document IItle as md1cated on the title page Its class1ficat10n should be mdlcated by the appropnate abbreviation (S,C,R or U) m parentheses after the utle)

Investigation of Decoupling Material Performance with a Transmission Loss Model and Acoustic Intensity Measurements

AUTHORS (Last name first name, m1ddle rn111al If m1htary, show rank, e g Doe. MaJ John E)

K. Klein, Q. Liu, and J.Y. Guigne

DATE OF PUBLICATION (month and year of pubhcat10n of 6a NO OF PAGES (total 6b NO OFREFS (total c1ted m document) contammg mformauon Include document)

Annexes, Append1ces, etc)

September 1999 I27 II

DESCRlPTIVE NOTES (the category of the document, e g techmcal report, techmcal note or memorandum If appropnale, enter the type of report, e g mtenm, progress, summary, annual or final G1ve the mclus1ve dates when a spec1fic reportmg penod IS covered)

DREA Contractor Report

SPONSORJNG ACTIVITY (the name of the department prOJect office or laboratory sponsonng the research and development Include the address)

Defence Research Establishment Atlantic P.O. Box 1012, Dartmouth, N.S. B2Y 3Z7

PROJECT OR GRAl'.'T NO (1f appropnate, the applicable research 9b CONTRACT NO (1f appropnate. the applicable number under and development prOJect or grant number under wh1ch the document wh1ch the document was wnrten) was wntten Please spec1ty whether proJect or grant)

Project No. l.g.h.14 W7707-7-5409

ORIGINATOR'S DOCUMENT NUMBER (the offic1al document lOb OTHER DOCUMENT NOS (Any other numbers v.h1ch rna: number by wh1ch the document1s 1dent1fied b) the ongmatmg be ass1gned th1s document either by the ongmator or by the aciJVJty Th1s number must be umque to th1s document) sponsor)

DREA CR 1999-127 DOCUMENT A V AILABILlTY (any hm1tat10ns on further d1ssemmatton of the document, other than those 1m posed by secunty classtficat10n)

( X ) Unhm1ted d1stnbut10n ( ) Dlstnbut10n hm1ted to defence departments and defence contractors, further dtstnbutton only as approved ( ) Dlstnbullon hmlled to defence departments and Canadian defence contractors, further dlstnbut10n only as approved ( ) Dlstnbullon hm1ted to government departments and agenc1es, further d!stnbut1on only as approved ( ) Dtstnbut!On hm1ted to defence departments, further d1stnbut10n only as approved ( ) Other (please spec1ty)

DOCUMENT ANNOUNCEMENT (any hmrtat10n to the b1bhograpluc announcement of th1s doc urn em Th1s w1ll normally correspond to the Document AvaJlab1hty (11) However where further d1stnbut1on (beyond the aud1ence spec1fied m 11) IS poss1ble, a w1der announcement aud1ence may be selected)

Unlimited

UNCLASSIFIED SECURITY CLASSIFICATION OF FORM

P513477.PDF [Page: 136 of 137]

DCD03 2/06/87-M

UNCLASSIFIED SECURITY CLASSIFICATION OF FOR.M

13 ABSTRACT (a bnef and factual summary of the document It may also appear elsewhere m the body of the document Itself It IS htghly des1rable that the abstract of classified documents be unclasstfied Each paragraph of the abstract shall begm wtth an md1Cat1on of the secunty class•ficat10n of the mformat10n m the paragraph (unless the document ttself IS unclassified) represented as (S), (C), (R), or (U) It IS not necessat} to mclude here abstracts m both offic1allanguages unless the text IS b1lmgual)

The complex dilatational moduli of three closed cell foam materials and one elastomeric material were determined by mechanical excitation of thin samples. The neoprene/EPT/SBR, polyvinylchloride, and ethylvinylacetate foams had moduli that ranged from 0.2 MPa to 3 MPa in the 100-900 Hz frequency range. The decoupling performance of these materials was then determined by applying them to steel substrates that were mechanically excited, and measuring the effect of the coatings on the radiated sound. Unlike previous studies where the test plates were supported at the comers and semi-submerged, in this study the plates were clamped at the edges and backed by an air filled concrete enclosure. This "concrete box" was submerged into a water filled tank and the radiated sound was determined by intensity mapping in the near field of the plate. Because the net radiated acoustic power was not uniformly positive across the frequency range studied (1 00- 900 Hz), a quantity related to the near field acoustic

power, L:\1\dA, was used to quantify the effect ofthe coating. The experimental

decoupling behaviour of the coatings was compared to that predicted by a one dimensional transmission loss model for the 4 layer system: air/ steel/ coating/ water; or for the 5 layer system that included the finite dimensions of the water layer in the tank: air/ steel/ coating/ water/ air. Several of the substrate/ coating combinations were predicted to have large decoupling amplification peaks based on their measured material properties and the one dimensional model. Experimentally, these peaks were either much smaller than predicted or not observed at all. This discrepancy was explained by the fact that edges of the steel substrate were clamped, precluding a mass-spring resonance effect which is responsible for the amplification.

14 KEYWORDS. DESCRIPTORS or IDENTIFIERS (techmcally meanmgful tenns or short phrases that charactenze a document and could be helpful m catalogumg the document They should be selected so that no secunty class1ficat10n IS reqUired Identifiers, such as eqmpment model designatiOn, trade name, mihtary proJect code name, geographic location may also be mcluded If poss1ble keywords should be selected from a published thesaurus e g Thesaurus ofEngmeenng and Scientific Terms (TEST) and that thesaurus-1denufied lftt not poss1ble to select mdexmg tenns wh1ch are Unclasstfied. the classlficattOn of each should be mdlcated as w1th the tttle)

decoupling damping noise reduction intensity transmission loss

SECURITY CLASSIFICAT!Ol'\ OF FORM UNCLASSIFIED

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