lund univ. - 130227
TRANSCRIPT
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Lund Univ. – 140129
WSP Acoustics [email protected]
Programme
INTRO – WSP
Business Areas
Regulations
Building Acoustic in general – design
Various constructions
Failure on site
Other
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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
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WSP Acoustics – business areas
Building acoustics
Environmental noise mapping
Industrial noise mapping
Interior noise
Room acoustics
Electro acoustics
Vibrations
WSP Acoustics – Building Acoustics
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WSP Acoustics – Environmental and industrial noise
Noise mapping
with CADNA and
SoundPlan
software
WSP Acoustics – interior noise
Measurements according to
ISO 10053 and ISO 354
and evaluation according to
ISO 11654 and SS 25269
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WSP Acoustics – interior noise
www.acousticfacts.com
Electro Acoustics
Development of new
telephone models for
Sony Ericsson
Speech alarm
systems –
requirements and
RASTI
measurements
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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
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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
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Ljudkonsultens rapporter…
Reduktionstal tersband Frekvenser deciBel
Beräkningar Mätningar akustiker
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Building Acoustics - Regulations
www.fsbi.se
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 25267 and SS 25268
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
To be applied in certain exceptional rebuilding projects after specific reconsideration
Optional classes for commissioner of building projects to achieve especially good sound climate
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Building Acoustics - Regulations
SS + Guidelines
www.fsbi.se
Commissioner of building
projects
SS 25267 and SS 25268 – sound class
technical requirements
Controller of building projects SS 25267 and SS 25268
Catalogue–methods concerning calculations and measurements
Project manager
SS-EN 12354 Calculation methods
SS 25267 and SS 25268
– Annexes including project advice
Manufacturer
SS-EN ISO 140 Measurement methods to
secure the acoustical quality of building
products
Contractor
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, Ln
Should be as low as possible
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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/T0)
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 717-1
Sound reduction value
Different measures
Rw
R´w
DnTw
DnTw+C50-3150
RA
R´A
RA,tr
R´w+C
R´w+C50-3150
R´w+Ctr
R´w+Ctr,50-3150
R´w+Ctr,50-5000
etc.
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Which sound reduction index should be valid?
• C, C50-3150, Ctr 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
-50
-40
-30
-20
-10
0
Lij d
B
Frekvens, Hz
Spektrum för att beräkna C och Ctr (50-3150 Hz)
Spektrum 01
spektrum 02
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Same value, Rw – different shapes
reduktionstal R
0
10
20
30
40
50
60
70
80
50 80 125
200
315
500
800
1250
2000
3150
[dB]
frekvens [Hz]
200 betong Rw 58 dB
D 120/95 202 M95
Rw 58 dB
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 70/70 303 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!
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The same is valid for impact sound
,i.e
L´nw, wood ≠ L´nw, concrete
Even if the single numbers are identical
Impact sound
Impact sound level, Ln
The impact sound level is measured / calculated in each single 1/3 octave band level from 50-5000 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
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Impact sound level
Different measures
Ln
L´n,w
L´n,w +CI
L´n,w +CI,50-2500
L´nT,w
L´nT,w +CI,50-2500
Same value but different shapes
Lnw =58 dB
Lnw+C50-2500 = 62 dB
Lnw =58 dB
Lnw+C50-2500 = 57 dB
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EN 12354 – 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
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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
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HDF + upper floor + light weight walls
HD/F 120/19, 330 kg
minimum
DD 70/70 202 M140
Measurement results?
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Emilsborg
Prefabricated massive concrete
Plattbärlag / HD/F
eller likvärdigt
Concrete 200 mm
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Emilsborg
R´w+C50-3150 = 60 dB
Building Acoustics – dwellings for elderly
Tibblehemmet Täby
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Amhult - R´w+C50-3150 = 56 dB
Juvelkvarnen
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Juvelkvarnen
0
10
20
30
40
50
60
70
80
50 80 125
200
315
500
800
1250
2000
3150
5000
Reduktionstal (50-
5000 Hz)
Ref (100-3150 Hz)
Juvelkvarnen
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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)
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Masonite Flexible Building system (MFB)
Masonite Flexible Building system (MFB)
And the measurement
results?
………….
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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
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Low frequency problem in a semi detached house
63 125 250 500 1k 2k 4k
0
10
20
30
40
50
60
70
Hz
dB
63 125 250 500 1k 2k 4k
0
10
20
30
40
50
60
70
Hz
dB L'n L'nw+Ci50-2500 = 48 dB
Airborne sound insulation
63 125 250 500 1k 2k 4k
20
30
40
50
60
70
80
Hz
dB
63 125 250 500 1k 2k 4k
20
30
40
50
60
70
80
Hz
dB R' R'w+C50-3150 = 58 dBC50-3150= -11
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What happens?
Concrete plate – should be divided
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Suspended ceiling
Building Acoustics - hospitals
Östra psykiatri
High
requirements
between rooms
and certain
details
Architect –
White in Gbg
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Building Acoustics - Offices
Sony Ericsson in Lund
Nya Pedagogen i Göteborg
Building Acoustics - Education
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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)
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Building Acoustics - Dwellings
Winner of ”The building
of the year” 2006!
Vavskedsgatan 10-12 in
Lunden, Gothenburg
Construction:
Concrete walls and floor
structure built up by HD/F
120/27 (365 kg/m2) + 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 140-6 and EN
ISO 140-8 available in BASTIAN database. Hence,
calculations may be performed according to EN 12354.
In cooperation with WSP (Constr. design)
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Other products
Building Acoustics - Other
Chalmers ”reaktorfysik” – rebuilding of a university unit to a
gym center (”Friskis & Svettis)
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Acoustics - Industry
Arla Foods, Vimmerby:
Design of new industrial plant for
dry milk manufacturing
Project manager: Tommy Zetterling
Thank you!!
For your attention
Twitter: @klashagb