PETALING JAYA CIVIC CENTRE DESKTOP STUDY MAINLY FOCUSES ON AUDITORIUM AND ITS ACOUSTICS DETAILINGS

1. DESKTOPSTUDYON ACOUSTIC DESIGN
OF AUDITORIUM
DONEBY:
17041AA109
17041AA094
17041AA102
17041AA112
17041AA116

2. PETALING JAYA CIVICCENTRE
-MALASIYA
ThebuildingofPetalingJayaCivicCentre,whichisalsoknownasPJCCorDewanSivik.
Thisbuildinghastaken5yearstocompletefromtheyearof1973to1978.
Thisbuildingaimstorepresentsociety’scivicvalueswithauniqueaestheecsofarchitecture.
Thisbuildinghasmull-funcconsuchasmusicals,exhibiion,celebratory,performancesandmusicals.
Italsoagoodplaaormforlocalresidentstogatheringwhichisalsoagoodopportunitytoletthem
enjoytherecreaaonalevents.
TThisbuildinghasmull-funcconsuchasmusicals,exhibiion,celebratory,performancesandmusicals.
Italsoagoodplaaormforlocalresidentstogatheringwhichisalsoagoodopportunitytoletthem
enjoytherecreaaonalevents.
Intheyearof2001,thesixbadmintoncourtshaverenovatedtoabanquethallwhichcouldfits
1000people.
Themainlobbywasalsoredesignedwithapointed-starplanlayout.Thecurrentlycapacityofthe
conferenceroomcouldfit100peoplewhiletheauditoriumwithair-condiionedcouldfit1000
ppeople.Italsohadafaceliitointorenovaanggivingtheexteriorablacklavishlook.
Asthearchitectwhodesignedthisbuildingwasunabletoidentified,ithasassumeddesignedby
Dato’KingtonLoo,whichisalsothearchitectofDewanTunkuCanselorUniversiiMalaya.

3. SITECONTEXTANALYSIS
Themainroad,JalanYongShookLin,that
splitsdownsouthsurroundingtheTaman
MPBJandformsanewpathwaythat
allowsusertoaccesstheCivicCentrevia
theparkinglottotheentranceofthe
PetalingJayaCivicCentre.Theformaaon
ooftheroadstructureactsasoursite
boundary.
BUILDING ACCESSIBILITY
RELATIONSHIPOFBUILDING TO
SURROUNDINGS

4. 6.MENARA CHOYFOOKONN
MenaraChoyFookOnnisa18storeyofficebuildinglocatedwithin
thenewPJtown,closetoMenaraMBPJ.Thebuildinghasover227
parkingbaysandwitheasyparkinginthevicinityandconnectedto
numerouspublictransportaaon,thisbuildingisapreferredchoice
formanycompanieslookingatthePJStatearea
5.SurauSecconPJ7,SurauNurEhsan
SurauNurulEhsanisamosquelocated
inthedistrictofHuluLangat,Selangor,
Malaysia.Itbecamethecenterofworship
forthelocalcommunity
4.BalaiBombadanPenyelamatPetalingJaya
FireandRescueStaaonPetalingJayawasestablished
in1993andoperatesin1994
3.Shoplots
Rowofshoplotspreparedwith
necessiieslikecaraccessories,a
computershop,abank,andacafe.
2.TamanJaya
TamanJayaisaparkthatispopularwithresidents
ofPetalingJayatodojoggingandrecreaaonalaccviies.
Quietgardenissurroundedbyawidevarietyoftrees
andabeauufullake,orjuststrollthegardensandlake
whileenjoyingsnackssoldbydealerswhooperate
nnearthelake.
1.MPBJ
ThePetalingJayaCityCouncil(Malay:Majlis
BandarayaPetalingJaya,abbreviatedMBPJ)is
thecitycouncilwhichadministersthecityof
PetalingJayainthestateofSelangor,Malaysia.
Thiscouncilwasestablishedaaerthecitywas
oofficiallygrantedcitystatuson20June2006.
Theirjurisdicconcoversanareaof97square
kilometers

5. RESPONSETO CLIMATE
Thiscityhasatropicalclimate.PetalingJayahasasignificantamountofrainfallduringtheyear.
Thisistrueevenforthedriestmonth.
AccordingtoKöppenandGeiger,thisclimateisclassifiedasAf(tropicalrainforestclimate).
TheaveragetemperatureinPetalingJayais27.0°C.About2438mmofprecipitaaonfallsannually
Onaverage,thetemperaturesarealwayshigh.
•Alotofrain(rainyseason)fallsinthemonths:January,February,March,April,May,June,July,
August,September,October,NovemberandDecember.
•Onaverage,thewarmestmonthisApril.
•Onaverage,thecoolestmonthisSeptember.
•Aprilistheweeestmonth.Thismonthshouldbeavoidedifyoudon'tliketoomuchrain.
•Juneisthedriestmonth.
Above,surroundingvegetaaonactsasanaturaldrainageforcollecconofwaterforprevennonof
rainwaterflowontothepathway.Inaddiion,theplantaaonoftheshrubsandplantsprovidesa
muchmoregreenerenvironmentasasortofcontrastofthegreeneryandthesurrounding
buildings.
abovepicturesshowstheopenspaceinwhereitpromotesnaturalairtovennlatethearea,and
alsoforanyonetostay-inforprotecconandnotanecessityforpeopletoaaendorenterthe
building.Becauseofthetropicalclimate.
Thedesignoftheroofingoftheentranceclearlyactsasawaythatpeoplecanactuallytakeshelter
fromoncomingrainaswellasactsasatypeofshadefromthehotshinningsunshine.

6. ARCHITECTURALLAYOUTOFBUILDING
:MASTERPLAN OFTHESITE.
FLOORPLAN OFTHECIVICCENTRE

7. AUDITORIUM
PANORAMICVIEW OFTHEPJCCAUDITORIUM

8. FLOORPLAN OFPJCCAUDITORIUM

9. FORBETTERCLARIFICATION,WEHAVECATEGORISED THEAUDITORIUM
SEATINGSINTO 3ZONES:
Zone1wherethefrontsectionoftheseatsislocated,
Zone2wherethebacksectionoftheseatsunderthebalconyislocated,
Zone3wheretheseatsarelocatedonthebalcony.Differentzoneshavedifferent
acousticalpropertiesaffectingthemduetodistancesandformoftheauditorium.
TThesewillbefurtheraddressedinthelaterpartofthereport.
Architecturalacoustics
Thestudyofhowsoundsarereflectedinrooms,islargelyconcernedwithhowindirect
soundchangesthequalityofthesoundswehearinrooms.Themajorfactoraffecting
indirectsoundistheamountofsoundisabsorbedbythewalls,ceiling,andfloorofthe
room.Ifmostofthesoundisabsorbed,thentherearefewsoundreflectionsandlittle
indirectsound.Ifmostofthesoundisreflected,thentherearemanysoundreflections
anandalargeamountofindirectsound.Anotherfactoraffectingindirectsoundisthesize
andshapeoftheroom.Thisdetermineshowsoundhitssurfacesandthedirectionsin
whichitisreflected.
SECTION OFPJCCAUDITORIUM

10. ExistingSoundSources.

11. Conclusion:
Theidentificationofthesesoundsourceswhicharenoisewillenableustojustifyif
acousticalinterventionshavebeentakentoreducenoisethroughsoundabsorption,
diffusion,andtoimproveincidentsoundsfromthestagethroughsoundreflectionetc.
ThesewillbediscussedinouranalysiswhereacousticalperformanceofthePJCC
auditoriumasawholewillbestudied.
SSoundReinforcementSystem
Duetothenatureofalargeauditorium,soundreinforcementsystemisusedto
accommodatethelargevolumewheresoundisbetterheardacrosstheaudience,
especiallyinareaswhichhavesoundshadows.PJCCauditoriumusesacentrallylocate
system,whichiscommonamongmanyotherauditoriums,withasingleclusterofloud
speakersoverasoundsource.Thissystemgivesmaximumrealismastheamplifiedsound
comesfromthesamedirectionasoriginalsound.Additionalsoundspeakersarelocatedat
tthesidewallsoftheauditoriumforsoundtobedirectedtozoneslocatedatthefurther
endoftheauditorium.
Belowaretheidentifiedsoundreinforcementsystem usedinPJCC:

12. 1.JBLMRX525Dual15"2-WaySpeakerSystem
2.JBLMRX51515"2-WayLoudspeaker
3.JBLControlSB-210

13. Balcony
Anauditoriumdesignwhichincludesabalconyisusuallyusedtodecreasethedistance
fromthestagetoseatingareasandtoprovideunobstructedviews.
Thefrontofabalconyparapetshouldbedesignedtoavoidstrongreflectionsthatcould
affectsoundqualityinthefrontseatingareas.Hence,theplanviewofthebalconyusually
hasaconcaveshape.
SoundPath:GeneralPrinciples&Application
Ontheotherhand,wallsaroundanauditoriumareencouragedtobesplayedortiltedto
avoidparallelism.Thiswillavoidflutterechoesfromtakingplace.Anglescanalsobe
advantageouslyusedtodirectreflectedsoundtotheaudienceseatingarea,andtoprovide
diffusion.Anysurfacethatintroducesundesirableangleshouldbecoveredwithabsorptive
materialtoreduceacousticaldefects.
Controlofsoundareusuallyinfluencedbytheformandthematerialityusedinthespace.
Themostdifficultaspectofhalldesignistheambiguityofthegoalitself,wheredifferent
usage,basedonfunction,oftheauditoriumhavedifferentacousticalrequirements.
Wall
Wallsinfrontofanauditoriumareusuallyflat,toproducestrongearlyreflectionsthatare
integratedwiththedirectsoundtoenhanceitbeforereachingtheaudience.Thedepth
ofthefrontstageisusedtoachieveproperblendofsoundsfromvariousinstrumentsand
voicesbeforedistributingtotheaudience.

14. Convex-surfacedceilingspreventsflutterechoes
Ceilingheightisusuallydeterminedbytheoverallroomvolumethatisrequired.
Aceilingthatistoohighinaroommaycreateundesirablelatereflections.
Toavoidpotentialflutterecho,theceilingshouldnotbeparalleltothefloor.
Instead,itshouldbegeometricallydesignedtodirectsoundtotherearofthe
hallortodiffuseitthroughoutthehall.
Concavesurfacessuchasbarreledceilingsanddomesshouldbeavoidedto
ppreventsoundconcentrationwhichisanunwantedacousticaldefect.
Ceiling
Ceilingthatistoohighwillresultinundesirable
latereflections
Concavesurfaceswillresult
insoundconcentration
Floors
Araked(sloped)floorisdesirableespecially
forlargehallsdesignedeitherformusicor
speech.Arakedfloorimprovessightlines
andallowslistenertoreceivemoredirect
soundthanwouldbeavailableonaflatfloor.
Rakedfloorallowsbetterlineofsight,novisual
obstruction

15. PJCCAuditorium designconsiderations
PJCCAuditorium Design
PJCCAuditorium hasafan-shapedplanwithbalconylayout

16. Wewillnowlookathowtheselectionofmaterialsalsoaffecttheacoustical
propertiesoftheauditoriumshownbelow.

18. Soundreflectionoccurswhensoundisbouncedoffasurface.Thisusually
occursonflat,rigidsurfaceslikeconcreteorbrickwalls.Soundwavesthatare
unabletopenetrateveryfarintothesurfacecausesthewavetoricochetback
againstitsdirection.
Thestagelocatedatthefronthasflatsurfaces.
Thisistoproducestrongearlyreflectionsthatareintegratedwiththedirect
ssoundandenhanceit.
Onthecontrary,stronglatereflectionsandreverberationatthewallsofthe
audiencelevelarenotappreciated.Inotherwords,thestageareaandfrontof
thehallaregenerallymadereflectivewhileabsorptionofsoundisplacedinthe
seatingareaandreaofthehall.
SoundDiffusion
Sounddiffusionisimportantinroomacousticsbecauseconstantstrong
reflectionofsoundwaveswillcreateundesirablesoundeffect.Sounddiffusion
helpsbreakthewavepatternintoseveralotherdirectionswhichdepletesits
energyfaster.Whenasoundwavehitsanirregularsurfacesuchasthecarpet,
thevibrationbreaksupanddividestheenergyofthewaveintosmallerpaths.
IInPJCCauditorium,timberstrippanelsandcarpethelpdiffusesoundbetter,
reducingstrongreflectionfromconstantlybouncingoffwithinthespace.
Balconydimension(L)&Soundshadowdiagram(R)
`
SoundAbsorption
Whenasoundwavehitsasurface,thekineticenergyitcontainsisconverted
intosmallamountofheatenergywhichdissipates,causingittodecayfaster.
Howwellamaterialabsorbssounddependsonseveralfactors,suchas
materialdensityandhowporousitis.Carpetsandtimberstrippanelsoffera
smallsoundabsorptionespeciallythoughitsporousnature(carpet)orcavities
ddesigned(timberstrippanels)wheresounddissipateswithinthistinyspace.

19. IdentifiedmaterialsusedinPJCCauditorium
Thetoiletlocatedintheauditoriumhas
nosoundlockwhichhasresultedin
unwantedsounddiffractionintothe
space.Thedesigncouldbeimprovedby
introducingsoundlockwhichactsasa
bufferzonewheresoundfromthetoilet
ccouldslowlydissipatewithoutentering
theauditorium.Entrancescouldalso
includesoundlocksothatmovements
inandoutoftheauditoriumwillnot
createsignificatenoisewhichdisturbs
theatmosphereoftheauditorium.
Curtainscouldbeusedatthedoorways
ttofurtherdampenthesoundwave

20. MATERIALITY

22. CONCLUSION
THROUGHTHISPROJECT,WELEARNEDTHATASUCCESSFULDESIGN OF
AUDITORIUMSDEPENDSALOTON ITSACOUSTICDESIGN WHICHINCLUDES
THEAUDITORIUM LAYOUTANDTHETYPESABSORPTION MATERIALSUSED.
ACOUSTICPLAYSTHEROLEOFPRESERVINGANDENHANCINGTHEDESIRED
SOUNDANDTO ELIMINATENOISEANDUNDESIREDSOUND.
AAFTERVISITINGANDDOINGRESEARCHON OURCHOSEN BUILDING,WE
LEARNEDABOUTMATERIALABSORPTION COEFFICIENTANDHOW TO IDENTIFY
EXISTING ACOUSTICANDSOUNDSOURCES.
THROUGHTHOSEINFORMATION,WETHEN LEARNEDTO CALCULATEAND
ANALYZETHEDATAWECOLLECTEDFROM SITE.
THUS,ENABLINGUSTO LEARN ABOUTACOUSTICRAYBOUNCINGDIAGRAMS,
SOUNDPRESSURELEVEL,SOUNDREDUCTION INDEXANDREVERBERATION TIME.

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