Botteldooren, Dick

De Coensel, Bert

De Muer, Tom

Peeters, Bert

van Blokland, Gijsjan

English

Ghent University Academic Bibliography

tation are the primary source of noise. The problem of transportation noise is not confined by political or social frontiers. It affects therich who may live in a quiet residential area but who must make full use of transport to maintain their affluent existence, as well asthe less fortunate who must live close to a highway, a major road, or an elevated railway line. A systematic development of thecapability for accurate predictions of the propagation of land transportation noise in dense high-rise cities is highly desirable. Thispaper summarizes the current models for predicting sound fields in urban environments and gives an overview of the recent advancesof various numerical models to predict the sound field in urban environments. Work supported by the Research Grants Council of theHong Kong SAR Government and the Hong Kong Polytechnic University.9:45–10:00 Break10:002aNS5. Acoustic pulse propagation in an urban environment. Donald G. Albert USA ERDC-CRREL, 72 Lyme Rd., Hanover,NH 03755-1290 and Lanbo Liu USA ERDC-CRREL, Hanover, NH 03755-1290Experimental measurements conducted in a full-scale artificial village show that complex signatures are formed by multiplereflections and diffractions from buildings along the propagation path. A two-dimensional finite difference time domain FDTDsimulation running on a personal computer allows this wave interaction to be studied in detail. Time reversal processing to locate asound source in an urban area is investigated using this simulation method. The results demonstrate that as few as three non-line-of-sight sensors are sufficient to determine the source location, and that errors on the order of a meter in the building or sensor locationsstill allow the correct source location to be determined. Work supported by U.S. Army.10:252aNS6. Sound field simulation and acoustic animation in urban squares. Jian Kang and Yan Meng School of Architecture,Univ. of Sheffield, Western Bank, Sheffield S10 2TN, UK, j.kang@sheffield.ac.ukUrban squares are important components of cities, and the acoustic environment is important for their usability. While models andformulae for predicting the sound field in urban squares are important for their soundscape design and improvement, acousticanimation tools would be of great importance for designers as well as for public participation process, given that below a certain soundlevel, the soundscape evaluation depends mainly on the type of sounds rather than the loudness. This paper first briefly introducesacoustic simulation models developed for urban squares, as well as empirical formulae derived from a series of simulation. It thenpresents an acoustic animation tool currently being developed. In urban squares there are multiple dynamic sound sources, so that thecomputation time becomes a main concern. Nevertheless, the requirements for acoustic animation in urban squares are relatively lowcompared to auditoria. As a result, it is important to simplify the simulation process and algorithms. Based on a series of subjectivetests in a virtual reality environment with various simulation parameters, a fast simulation method with acceptable accuracy has beenexplored. Work supported by the European Commission.10:502aNS7. Modeling the characteristics of wheelÕrail rolling noise. Wai Keung Lui, Kai Ming Li Dept. of Mech. Eng., The HongKong Polytechnic Univ., Hung Hom, Hong Kong, and Glenn H. Frommer MTR Corp. Ltd., Kowloon Bay, Hong KongTo study the sound radiation characteristics of a passing train, four sets of noise measurements for different train operationalconditions have been conducted at three different sites, including ballast tracks at grade and railway on a concrete viaduct. The timehistories computed by the horizontal radiation models were compared with the measured noise profiles. The measured sound exposurelevels are used to deduce the vertical directivity pattern for different railway systems. It is found that the vertical directivity ofdifferent railway systems shows a rather similar pattern. The vertical directivity of train noise is shown to increase up to about30 before reducing to a minimum at 90 . A multipole expansion model is proposed to account for the vertical radiation directivityof the train noise. An empirical formula, which has been derived, compares well with the experimental data. The empirical model isfound to be applicable to different train/rail systems at train speeds ranging up to 120 km/h in this study. Work supported by MTRCorporation Ltd., Innovation Technology Commission of the HKSAR Government and The Hong Kong Polytechnic University.Contributed Papers11:152aNS8. Microscopic traffic modelling in urban noise assessment. BertDe Coensel, Dick Botteldooren, Tom De Muer Acoust. Group, Dept. ofInformation Technol., Ghent Univ., St. Pietersnieuwstraat 41, B-9000Ghent, Belgium, Bert Peeters, and Gijsjan van Blokland MPRaadgevende Ingenieurs, NL-5260 CB Vught, The NetherlandsThe temporal structure of the urban soundscape can be rather complex,due to the presence of many screening and reflecting surfaces and manydifferent sound sources, of which traffic noise is the most dominant. Fromthe point of view of soundscape research, the background level as well asthe time structure of noise peaks are important. However, these indicatorscannot be estimated easily by current noise prediction models, based onstatic traffic flows. Therefore, a dynamic traffic noise model was used,based on a microscopic traffic simulation. This way, individual vehiclescan be traced, each having an associated set of noise sources that candepend on vehicle properties such as speed and acceleration, as well as onroad properties such as the surface type. The model further consists of anISO 9613 based propagation component, which can account for multiplereflections and diffractions. Maps of statistical noise levels, but also ofmore complicated measures reflecting the time structure of the sound-scape, can be produced. This way, the soundscape contribution of singlevehicles can be traced, as well as the influence of more general vehicleproperties, such as the contribution of vehicle acceleration noise to thesoundscape at junctions.2418 2418J. Acoust. Soc. Am., Vol. 117, No. 4, Pt. 2, April 2005 149th Meeting: Acoustical Society of America149th MEETING OF THE ACOUSTICAL SOCIETY OF AMERICAThe 149th Meeting of the Acoustical Society of America~ASA! will be held Monday through Friday, 16–20 May2005 in Vancouver, Canada. All Technical Sessions and mostmeeting events will be held at the Hyatt Regency VancouverHotel.Registration will begin Monday, 16 May, at 7:30 a.m.SECTION HEADINGS1. HOTEL INFORMATION2. TRANSPORTATION AND TRAVEL DIRECTIONS3. ENTERING AND LEAVING CANADA4. STUDENT TRANSPORTATION SUBSIDIES5. MESSAGES FOR ATTENDEES6. REGISTRATION7. ASSISTIVE LISTENING DEVICES8. TECHNICAL SESSIONS9. TECHNICAL SESSION DESIGNATIONS10. TOPICAL MEETING ON CLASSROOM ACOUSTICS11. HOT TOPICS SESSION12. TUTORIAL LECTURE ON AUTOMATIC SPEECH RECOGNITION13. GALLERY OF ACOUSTICS14. STUDENT DESIGN COMPETITION15. WORKSHOP IN ACOUSTICS FOR MUSICAL INSTRUMENTBUILDERS16. 1st ASA WORKSHOP ON SECOND LANGUAGE SPEECHLEARNING17. CONFERENCE ON INDUSTRIAL RELATED ENVIRONMENTALAND OCCUPATIONAL NOISE18. MEDWIN PRIZE IN ACOUSTICAL OCEANOGRAPHY ANDACOUSTICAL OCEANOGRAPHY PRIZE LECTURE19. TECHNICAL COMMITTEE OPEN MEETINGS20. PLENARY SESSION21. ANNUAL MEETING OF THE MEMBERSHIP22. ANSI STANDARDS COMMITTEES23. COFFEE BREAKS24. A/V PREVIEW ROOM25. ONLINE MEETING PAPERS26. E-MAIL ACCESS27. BUFFET SOCIALS28. FELLOWS LUNCHEON29. STUDENTS MEET MEMBERS FOR LUNCH30. STUDENTS’ RECEPTION31. COMMITTEE ON WOMEN IN ACOUSTICS LUNCHEON32. CHILD CARE33. ACCOMPANYING PERSONS’ PROGRAM34. WEATHER35. TECHNICAL PROGRAM ORGANIZING COMMITTEE36. LOCAL MEETING COMMITTEE37. PHOTOGRAPHING AND RECORDING38. NOTE TO SMOKERS39. ABSTRACT ERRATA40. GUIDELINES FOR ORAL PRESENTATIONS AT MEETINGS OFTHE ACOUSTICAL SOCIETY OF AMERICA41. SUGGESTIONS FOR EFFECTIVE POSTER PRESENTATIONS42. GUIDELINES FOR USE OF COMPUTER PROJECTION IN MEET-ING PRESENTATIONS43. DATES OF FUTURE ASA MEETINGS1. HOTEL INFORMATIONThe Hyatt Regency Vancouver Hotel ~655 Burrard Street,Vancouver, BC V6C 2R7, Canada! is the headquarters hotelwhere most meeting events will be held. The cut-off date forreserving rooms at special rates has passed. Please contactthe hotel directly at 604-639-4820 ~800-233-1234; Fax: 604-639-4829! for information on availability of rooms. Specialrates at the Hyatt were: $160 USD/single or double.2. TRANSPORTATION AND TRAVEL DIRECTIONSThe Vancouver International Airport ~YVR! serves over15 million passengers per year. More than 40 airlines operate17 International and 22 U.S. scheduled flights per day. Forcomprehensive information on options for traveling to Van-couver by air, bus, train, ferry or car visitwww.tourismvancouver.com/transportation/getting_here.cfmThere are several options for traveling from VancouverInternational Airport to downtown Vancouver:Public transit: From Airport Level 1 take Bus 424 toAirport Station and then Bus 98 to Burrard Station. Busesleave the airport every few minutes and take about 45 min-utes to reach downtown Vancouver. Fares cost $2 to $3. Forcurrent details visit www.translink.caAirporter bus: This bus picks up passengers at severalpoints in the Airport for transport to major downtown hotels.The service runs every half-hour and costs $12 one-way, $18return. For current details visit www.yvrairporter.comTaxis: Location of taxi-stands are posted in the AirportTerminal. The fare to the Hyatt is approximately $22.Car Rental: There are offices of major car-rental compa-nies located both at the airport and downtown. For moredetails check http://www.tourismvancouver.com/transportation/getting_here.cfm#carDriving and directions to hotel: For attendees who willbe driving, parking is available at the Hyatt Regency Van-couver.From Vancouver International Airport ~14 miles! takeGrant McConnachie Way over the Arthur Lang Bridge. ExitGranville Street, proceed north ~54 blocks!. Turn left at 16thStreet. Go down two blocks and turn right on to BurrardStreet. Procceed on Burrard and over Burrard Street Bridgeto Georgia Street ~10 blks!. Hyatt Regency Vancouver is onyour left.3. ENTERING AND LEAVING CANADAInformation for US citizens and permanent residents: U.S.citizens and permanent residents require one of the follow-ing: 1! birth certificate, 2! resident alien card, 3! green cardpresented with photo I.D. or 4! a passport valid for at least 6months after the date of return to the US. A driver’s licensealone is NOT accepted as proof of citizenship. U.S. Citizen-ship and Immigration Services ,uscis.gov/graphics/index.htm. provides additional information about travelfrom the US to Canada.Information for international visitors: Visitors enteringCanada from countries other than the United States musthave a valid passport, and may require other documentationsuch as visas. Visit www.cic.gc.ca/english/visit/index.html orcheck with the nearest Canadian Consulate well in advanceof travel for visa requirements. For a list of Canadian Con-sulate offices visit www.cic.gc.ca/english/offices/missions.htmlCitizenship and Visa Requirements for Travel to and fromCanada: Information for students and postdocs with F-1 andA24 A24J. Acoust. Soc. Am., Vol. 117, No. 4, Pt. 2, April 2005 149th Meeting: Acoustical Society of America

Miscroscopic traffic modelling in urban noise assessment

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Miscroscopic traffic modelling in urban noise assessment

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Ghent University Academic Bibliography