Lund Univ Programme. WSP Acoustics INTRO WSP. Business Areas. Regulations. Building Acoustic in general design

Transcription

1 Lund Univ WSP Acoustics Programme INTRO WSP Business Areas Regulations Building Acoustic in general design Various constructions Failure on site Other 1

2 WSP Acoustics 53 consultants in the Swedish business Approximately 160 consultants in the global business Offices in Sweden, Norway, Finland, UK, USA, Dubai, Australia, Canada, South Africa and some certain persons in other countries WSP Acoustics, Sweden The Swedish business: Gothenburg/Karlstad 28 persons * Building acoustics * Env acoustics * Room acoustics * Structural vibrations Stockholm/Uppsala 14 persons * Building acoustics * Aircraft noise * Industrial (wind power) acoustics Malmoe/Jkp 11 persons * Industrial noise * Electro acoustics (mobile phones) * Env acoustics 2

3 WSP Acoustics business areas Building acoustics Environmental noise mapping Industrial noise mapping Interior noise Room acoustics Electro acoustics Vibrations WSP Acoustics Building Acoustics 3

4 WSP Acoustics Environmental and industrial noise Noise mapping with CADNA and SoundPlan software WSP Acoustics interior noise Measurements according to ISO and ISO 354 and evaluation according to ISO and SS

5 WSP Acoustics interior noise Electro Acoustics Development of new telephone models for Sony Ericsson Speech alarm systems requirements and RASTI measurements 5

6 Room Acoustics Room acoustic design of cinemas Room acoustic design in public areas WSP Acoustics Virtual Reality Model Creates real room models, incl. auralization. A computer model show how different linings on walls and ceilings appear acoustically in a room. Architects and an acousticians can easily cooperate in the design of rooms creating desired sound properties Almedahls textiles 6

7 Vibrations Vibration surveillance Risk analysis Measurements Building Acoustics Only BA itself is a large topic Design Measurements Product knowledge Various structures and its behaviour Regulations etc 7

8 15 Ljudkonsultens rapporter 16 Reduktionstal tersband Frekvenser decibel Beräkningar Mätningar akustiker 8

9 Building Acoustics - Regulations New building regulations in Sweden from 1 july 2006 This imply large cost saving possibilities for those who are working in the building industry if used correctly requires knowledge Building Acoustics Regulations SS and SS Class A Class B Class C Class D National building code (in Sweden BBR, BFS 1993:57 including revisions until 2013) To be applied by local authorities, using certain application guidelines Optional classes for commissioner of building projects to achieve especially good sound climate To be applied in certain exceptional rebuilding projects after specific reconsideration 9

10 Building Acoustics - Regulations SS + Guidelines Commissioner of building projects SS and SS sound class technical requirements Controller of building projects SS and SS Catalogue methods concerning calculations and measurements Project manager Manufacturer Contractor SS-EN Calculation methods SS and SS Annexes including project advice SS-EN ISO 140 Measurement methods to secure the acoustical quality of building products Educating employees, assignments from project manager quality plan, internal and external quality control Sound insulation - Sound insulation / sound reduction index, R Should be as high as possible - Impact sound level, L n Should be as low as possible 10

11 Sound reduction index The sound reduction index is measured / calculated for each single 1/3 octave value according to the formula: R=Lp1-Lp2+10*log(S/A) - or the Standardized level diff. DnT=Lp1-Lp2+10*log(T/T 0 ) Lp1 = Sound level in the sending room (with noise from a loudspeaker as a sound source) Lp2 = Sound level in the receiving room S = separating area A = sound absorption area in the receiving room Then the weighted sound reduction value is calculated acc to SS-EN ISO Sound reduction value Different measures R w R w D ntw D ntw +C R A R A R A,tr R w+c R w+c R w+c tr R w+c tr, R w+c tr, etc. 11

12 Lij db Which sound reduction index should be valid? C, C , C tr etc. are called spectrum adaptation terms Various sound sources have different spectrum. The adaptation term fit the measure to a sound source A political way to meet an agreement Spectrum adaptation terms in diagram Spektrum för att beräkna C och Ctr ( Hz) Spektrum 01 spektrum Frekvens, Hz 12

13 Same value, Rw different shapes [db] reduktionstal R betong Rw 58 db D 120/ M95 Rw 58 db frekvens [Hz] Field value or laboratory value Depending on how the building products are connected to eachother the final sound insulation might differ a lot from a laboratory measurement Exampel: Gypsum wall DD 70/ M140 - laboratory Rw=72 db In a building with a floor structure of 160 mm concrete R w=55 db SI decreases 17 db! Apply an upper floor construction for instance GIHA R w=58 db an improvement 3 db! 13

14 Impact sound The same is valid for impact sound,i.e L nw, wood L nw, concrete Even if the single numbers are identical Impact sound level, Ln The impact sound level is measured / calculated in each single 1/3 octave band level from Hz according to the formula: Ln=Lp+10*log (A/10) or LnT=Lp+10*log (T/0,5) Lp = sound level in the receiving room (with the impact sound machine as a sound source) A = Sound absorption area in the receiving room T = Reverberation time in the receiving room Then weighted impact sound level is calculated Lnw or LnTw One single value 14

15 Impact sound level Different measures L n L n,w L n,w +C I L n,w +C I, L nt,w L nt,w +C I, Same value but different shapes Lnw =58 db Lnw+C = 62 db Lnw =58 db Lnw+C = 57 db 15

16 EN BASTIAN Building acoustics How does the sound appear in various structures? Sound insulation Room acoustics Sound propagation from installations Sound levels from traffic / facade sound insulation 16

17 Typical structures Prefabricated massive concrete Concrete casted in situ Prefabricated hollow concrete on steel structures with light weight walls Prefabricated hollow concrete and massive concrete walls Light weight structures Etc etc.. Building Acoustics - Dwellings Chabo 479 dwellings for students in Gothenburg close to Chalmers University of technology Designed to meet the new minimum requirements in Sweden 17

18 HDF + upper floor + light weight walls HD/F 120/19, 330 kg minimum DD 70/ M140 Measurement results? 18

19 Emilsborg Prefabricated massive concrete Plattbärlag / HD/F eller likvärdigt Concrete 200 mm 19

20 Emilsborg R w+c = 60 db Building Acoustics dwellings for elderly Tibblehemmet Täby 20

21 Amhult - R w+c = 56 db Juvelkvarnen 21

22 80 70 Juvelkvarnen Reduktionstal ( Hz) Ref ( Hz) Juvelkvarnen 22

23 Different Wooden structure systems Volume elements Setra group Martinssons Moelven Lelånghus Etc etc Casette systems Masonite Moelven Södra Semi Fågelfors Etc etc Masonite Flexible Building system (MFB) 23

24 Masonite Flexible Building system (MFB) Masonite Flexible Building system (MFB) And the measurement results?. 24

25 Wooden ond other typical lightweight structures Impact sound in a floor structure is almost always the weakest part If the impact sound requirement is fulfilled then also the airborne sound insulation will be fulfilled Andra konstruktioner Old attics Gyproc TCA Etc etc 25

26 Low frequency problem in a semi detached house db L'n L'nw+Ci = 48 db k 2k 4k Hz Airborne sound insulation C = -11 db R' R'w+C = 58 db k 2k 4k Hz 26

27 What happens? Concrete plate should be divided 27

28 Suspended ceiling Building Acoustics - hospitals Östra psykiatri High requirements between rooms and certain details Architect White in Gbg 28

29 Building Acoustics - Offices Sony Ericsson in Lund Building Acoustics - Education Nya Pedagogen i Göteborg 29

30 Building Acoustics - Dwellings Building Acoustics - Dwellings Kv. Venus; Approximately 1000 dwellings in an area exposed to noise from the motorway across Sweden to Norway, (E 6) 30

31 Building Acoustics - Dwellings Winner of The building of the year 2006! Vavskedsgatan in Lunden, Gothenburg Construction: Concrete walls and floor structure built up by HD/F 120/27 (365 kg/m 2 ) + GIHA sound floor Designed to meet sound class B, 4 db higher than minimum requirements Building Acoustics - product development Sound insulation data according to EN ISO and EN ISO available in BASTIAN database. Hence, calculations may be performed according to EN In cooperation with WSP (Constr. design) 31

32 Other products Building Acoustics - Other Chalmers reaktorfysik rebuilding of a university unit to a gym center ( Friskis & Svettis) 32

33 Acoustics - Industry Arla Foods, Vimmerby: Design of new industrial plant for dry milk manufacturing Project manager: Tommy Zetterling Thank you!! For your attention Klas.hagberg@wspgroup.se 33