• 4tmuspheric Ultrasound • Wind 'nstrllmenf Performance « Scienceilnd the StradivariUs Ausfralian Ac.oU$f,cal $ac1ttty . -.-~-;:. - - -- -- ~ ' - .. - .. --- ~2-'~i/WAffi:;~Q'!~:"{E.? . '!t-'_ rs~,_<~_ ': f!o,vy~Ar~t!_ t< Wljt!~sA~I' NJE: :-:~~~:_'_ :',' :~,~,~OC-TAVr -- , -,- - Reverberation Time __ ~ _ -',_" , -, KINGDOM PTY LTl and Q1 uch more;' -;..; ~: :~:.:;:;; ~ Phone: 02 9975 327~ EDITORIAL COMMIITEE: Neville Retcher Marlon Burgess Vol 28 No 2 CONTENTS August 2000 JosephLai BUSINESS MANAGER: ARTICLES Mrs Leigh Wallbank Acoustics Australia Atmospheric Infrasound General Business (subscripbons, extra copies, bacl< A. Bedard Jr. and T. Georges . ••.• Page 47 issues, advertising, etc) Mrs Le1gh Wallbank The Physiological Demands of Wind Instrument Performance POBox.579 CRONULLA NSW 2230 ...Page53 Tel (02) 952B 4362 Fax(02)95239637 Science and the Stradivarius walibankOzipworld.com.BU Acoustics Australia C. Gough •• .....................Page 57 All Edllorlal Matters (artJcles, repol1s, news, bookrelliews. new prodUGts, etG) CONSULTING NOTE Tile Editor, Acoustics Australia Acoustics & Vibration Unit Solving a Baffling Problem at Warrlngah Aquatic Centre Australian Defence Force Academy CANBERRAACT:2tlOO J. Andrew and O. PrItchett ••.•••.••.• . ........•............Page65 Tel (02)S2688241 Fax (02) 62688276 email:acoust-aust®adfa.edu.au htlp1iwww.users.bigpond.comlAwustics Australian Acoustical Society Enquiries see page 76 Acouslics Australia is published by the Australian Acouslical Sociely New Members (A.G.N.OOO712658) Responsibilrty for the contents of al1lCles rests upon the authors and not the Australian Acoustical Society. Articles are copyright, by the Auslfalian Acoustical SOCiely. All articles are sent Diary to referees for peer review belore acceptance. Acoustics Australia is abslractedant! indexed in Engineenng Acoustics Australia Information Index, Physics Abstracts, Acoustics Abstracts & Noise: Abstracts and RlJIIiews. Australian Acoustical Society Information 76 Printed by CronuliaPrintingGof'tyl\d, 16 GmnuliaPlaza, Advertiser Index CRONlJLLA2230 Tej (02)952359~, Fax (02) 95239637 email:print@cronul~pfint.com.au COVER ILLUSTRATION; Schematic cross-section of a violin. See article by Gough ISSN0814-6039 Acoustics Australia Vol. 28 (2000) NO.1 - 41 Poly tee Laser Vibration Measurement Focused on Better Productivity • aVO-30 ultTJSOn ic module for sign.3l s up to 20 MH J. • Controlle r for amplitudes up to +/. 20 mis, modu l e~ resolutions down to <0.1 ~rrVsI,!Hl and DC response • for in-pl;me v;lxatioo ~~~3U~~~~I~FV- 3320 NEW' VDO-650 and VDD-660 digit,,1vibrometers • Model OFV·30) and OFV·353 ,tandilrd vibrometer5 Applications include: for poin t measurement, • Engine component> • Paper and steel mil l • Fiber optic OFV-Sl 1 tests small parIS in hard-lo-reach bea rings • Automobil e body ~anels o Dual beam fiber optic OFV-512 measures relative • Rotating sha fts • ~~~~i~i2sors and vihr<tlion between two points • Houscholdapplianccs • High frequency pielO andpowcrtools 'Oual beam fiber optic OFV-518 for two independent devices senso r cha nnels • l ightweight and sma ll port, • Low cost ClV compact production vibrometers for on­ li ne quality control • Serit's 400Q system fo r torsionaVrotationa l stud ies < (';::1 -;. WARSASH Scientific 1c1: +61(0)2 931 90122 fax: +61 (O)29J182192 (;:J Advan ced Instruments for Research & In dustry e-mai l: sale,@warsash _c om.au l nlCmet: www.warsash.cum.au 42 - Vol . 28 (?oo::J) NO.1 Acoustics Australia In my last column on thc need for 'good members who are luminaries witltin the AAS. So our members are lobbying Authorities acoustics' I referred to the distress being By WIlY of inlerest to our wider for clumge, other mernbers are serving of experienced by purchase ofap>irtments with membership, the AAAC has prepared a Standards committees, scrving of State POPl" sound isolation. My practice rece'Yes a submi.sion which highlights the shor!_ committee. or Federal Conncil or organising call almost daily from "omeOne who is comings of the present building code system national and intcmational confcrcnces and experieneingthisdiffieultya.s1SU'P"ctare andmakesrecommen<iationsforappropriatc preparation of Acoustic. Australia. The being received by acoustic consuIlilIIcies changes. It appears timt this submission is positions are unpaid and volunlary; mcmbcr:s througholltAustnllia generating pressure on the Australian giving of their prlvate and precious lime as One of the main contributing factors in Building Code Board (ABCB) who well as paid employment to enhance this regard to rc.:enUy built apartments, town- ildministcr:stheflulldingCode,toraisethe acoustic field of endeavor. The result houses and the like I consider, hru! been the mmimum level and maybe introduce an. bringing about meaningful to the minimum de!,'1"ee of sound iwlatiOJl being impact sound i,oration rating as well. acowtic environment and mmed for. The Buildmg Code of AlIlltralia Publications such as the Building community out of an apathy as (BCA)set.aminirnmnde.lignlevdofSound Australia Magazine are now aware of the they hear their living conditions deteriorate. TransmiS$ion Class STC45 for inter_tenancy work being undertaken by the members of There is indeed much thai needs to be walkwilhDD~forimplctSOUDd AAAC..t_Hlistinginhighlightingthe done in thi. regard. For those of us who arc issue to ihosc who facc\hc dircct angst of the yet to becorneiovolvedatthi.level,tbereis At; Victoria DivisiOJl was about to embruk new aparbnent owners. These are the a challenge fo; you. Inter-tenancy noise is onthetsskofdoingsometbingalxmtthisissue builders who build what is designed only one issue in a plethonl of noise from initially a paroclrial stand-point, I wru; (hopefully), as well a. architects and annoyances. AAAC has focussed on a very delighted and encO\ll"agOOto discover that the designers who carry out the design important is.ue and the AAS 1<lkes this issoe has been one of considerable concern to mcorporaling the reqnirement.. of the opportnnity to acknowledge the work of our the AustraliilIl Association of Acoustical relevant Building Code as an absolute membeni and others in prepacatiOJl of the Consultmts (AAAe). This association is a minimum (again hopefully) 8JId not simply Sustaining Member of AAS with many we it"" a target (kqffBarnes ACoUSTlC RESfARCH LABORATORIES CHADWICK TECHNOLOGY LEVEL 7 BUILDING 2 UNIT3.10SALISBURYRDAO 423 PENNANT HILLS AOAO CASTLE HILL 2154 CSR BRADFORD INSULATlDN PACIFIC NOISE AND VIBRATloN 55STENNmAOAO 71 GONsnruTloNAVENUE INGLEBURN25fi5 CANBERRA26lJ1 RICHLANDSQLO.4D77 DALlDZ SAFETY PTY LTD PEACIOENGINEERINGPTYlTD 19 TEPKO ROAD 2·20 MARIGOLD STllEET AOAMSSDN ENGINEERING PTY LTD TEllREY HILLS 2084 POBOX1294 BtCO NOlSE CONTROL Pt1- OSBORNEPARK6916 5ORIVERSIOEROAD ASSDCIATlONOFAUSTRAlIAN CHIPPIMlNORTON2170 ACOUSTICAl CONSULTANTS G P EMBELToN & CO PTY LTD SOUND CoN11Iol PTY.LID. 61 LINKS AVENUE NTH CDBURG305a EAGLE FARM 4009 BARCLAY ENGINEERING INC CORPORATION PTY LTO VlPAC ENGINEERS AND SCIENTlSTSlTO OAKlElGHSOUTH3167 PRIVATEBAG16 PORTMElflOURNE32D7 BDRAlPLASTERBoARD NSWENVIRoNMBtT 616 lORIMEfI ST PRofECTIDNAUTHORITY WARSASHSClENTlFICP/l PO BOXA290 UNIT7,1-9MARtANST SYONEYSOUTH1232 REDFERN 2016 BRUEl&KJAERAUSTRALIAPTYlTO NDISECoNTROlAUSTRAUAP/L WDRKCDVERACOUSTICS POBOX177 70 TENNYSON ROAD PO BOX 592 TERAEY HILLS 2QB4 MORTLI\KE2137 RIGHMON02753 Acoustics Australia Vol. 28 (2000) No.1 -" Are you serious about your noise logger complying with AS 1259? • Easy to use • 16Mb of data storage • Stores hundreds of noise surveys Don't get caught • Typt: 1 rating • 23 to 118dB(A) measurement range without one! • 'lhe only portable logger fully compliant with ASl159 under Australian environmental conditions Onl)'availabl~inAustm1ia InfobytePtyLtd 19CunisSlrccl, Rydc, NSW 2112 Ph. +61-2-9807-~ 7 86 E-mail: b.Veale@fl .nct. au http://www.n.net.au/usen;.iinfobytc fixme~",,,,,,",, ljc _ \1broIionapp/il;al!oosplusflloOd.>l ~ i.!nI_ioo~s. Mt.JJtir*_'op<'faliol1.PC jr;1"grOllon. ORIlS PCP-. Acoustics Australia Of co"""'. il c~nnol Ix: "'peeled th at printvCTSi{)n, lhougb"'-"Tlcpubli,hcraarecUf' Au",lr.ti3l1Iilxaricswillhavctc""lJrct:Slomcdall """lyoff ..... lOXUS to.lectrotticveraionaof a noo;1,of9wiJcly di,"C"", acadt.mic community. l>r!:oIU\l<nflhcirjoorn.J., provi<kdthe su!>­ Whyshooldwehave sn:::talrchcollcctiooin17th 01<' ""'bon& libtary "."" " to maintain it. present THE FUTURE PUBLISHING ceUlury C'roa!ian pottry or in the political history l""d of ,u\n.<nplion p.ymonL Con,orlium of T"",,? If that is your interost, y<lu should bt =.U:tt;: atnrljlt:mCRlf between group, of libraries might ~~~f ~~IC:~:~ ~ ~:<~~~. ~I:; prep..-edtotravel! .nhancesuchdeal" lbou~h tb epublisher ...edsto thinner than usual, and that we are reprintiug In Sci"""" and Engineering the .ituatiOll i, thr.. papofSIT(}fl1 other publication" Wean; diffi:rent. Roo\:,..-cnotthe pri.maryIII<diumof mai ntain it,toIol reven\IC base "".archJMJblicalion;talhc,-lhc"YTCJl'C"",tk""",·I. fortu n ~tc in \>cing ~bl o '0 reprint . mo<t int=<tins pape!" on almospheri" infrasonic. rogelha,ha.,hccnory.aalliicd in,,,,,h a f()rmthal fromPhJ~"" Tooay,. fi.ld of==h that does it isrcatiily.,'ailablc for n:f<:rtn(;e flt\dinslruCtioo. not.ppo.,-tobcrep",,,,ntedin,\ustr.lia,.nd The primary medium o!' rcoean:h publication is al so~dclighlfulpap<ronlhcac~lU,tic,ohiol in s tbejoornal,andthese taD be divided intolwo fromJ-'irysi<'., World. Weha.eal"""'prinled. classe<:tbosepoblislied by scientifi<socidies, noteonphysiologKalacoustie,(tran,lated from and