acoustics cpd v6 - rehau group · acoustics cpd managing noise in the workplace using structure ......
TRANSCRIPT
Construction
Automotive
Industry
www.rehau.co.uk
ACOUSTICS CPDMANAGING NOISE IN THE WORKPLACE USING STRUCTURE & FURNITURE
LEARNING OBJECTIVESCPD Agenda
• Introduction to REHAU
• Introduction to Acoustic Science
•Definition
•Examples
•Science
© REHAU
•Science
• Regulation
• Product Solutions
• Project Gallery
• Learning Materials
LEARNING OBJECTIVESAt the end of this CPD you will
•Understand the Basic Principles of acoustics
•What Design Standards to consider
•How to incorporate Sound Reduction measures across a project
© REHAU
•How to incorporate Sound Reduction measures across a project
LEARNING OBJECTIVESCPD Agenda
• Introduction to REHAU
• Introduction to Acoustic Science
•Definition
•Examples
•Science
© REHAU
•Science
• Regulation
• Product Solution
• Project Gallery
• Learning Materials
REHAU COMPANY HISTORY
Private Company
- 1948 Founded in the Bavarian town of REHAU
- 1962 First UK Sales Office and Warehouse
opened in Slough
- 1975 First Manufacturing Plant was opened in
UK Locations
© REHAU
- 1975 First Manufacturing Plant was opened in
Amlwch
- 1995 Opening of the new headquarters in
Ross-on-Wye
- 2012 REHAU celebrated its 50th anniversary
trading in the UK
WHAT WE DOREHAU Business Divisions
As a polymer specialist REHAU is a leading supplier in the business divisions of:
© REHAU
INDUSTRYKey topics: Product and design solutions for the furniture industry, developments for the hose, profile and domestic appliance sectors.
AUTOMOTIVEKey topics: Lightweight construction, alternative drive concepts and new mobility approaches.
CONSTRUCTIONKey topics: Energy efficiency, water management, infrastructure and renewable energies.
1.2 billion people without access to
clean drinking water
DRINKING WATER
2013: around 7 billion people
WORLD POPULATION
Increasing importance of public
URBAN MOBILITY
2025: up to 1.5 billion
tonnes CO2 due to air trafficAIR TRAFFIC
2.3 billion people without adequate
sanitation
WASTE WATER
© REHAU
WHAT DRIVES USTRENDS AND CHALLENGES
2013: around 7 billion people
2010: 77,609,901
vehicles produced
TRAFFIC VOLUME6,500 Watt hours
per head
ENERGY CONSUMPTION
Increasing importance of public
local transport in cities
© Christian Grund
LEARNING OBJECTIVESCPD Agenda
• Introduction to REHAU
• Introduction to Acoustic Science
•Definition
•Examples
•Science
© REHAU
•Science
• Regulation
• Product Solution
• Project Gallery
• Learning Materials
LEARNING OBJECTIVESCPD Agenda
• Introduction to REHAU
• Introduction to Acoustic Science
•Definition
•Examples
•Science
© REHAU
•Science
• Regulation
• Product Solution
• Project Gallery
• Learning Materials
NOISEWhat is it?
Noise what is it?
• Unwanted sound
• A sound, that is loud, unpleasant or that causes disturbance.
Why is a big problem?
© REHAU
Why is a big problem?
• It is increasing
• Noise pollution exposed population - doubled; 30% in 1965 to 75% 2003
• Traffic noise has been increasing 0.2–0.3 dB(A) a year
PSYCHOACOUSTICSDISCOMFORT: HUMAN PERCEPTION
PERMANENT STRESSMENTAL & PHYSICAL
STRESS
!
Productivity ����
© REHAU
Information incorrect / not understood
(decreasing speech comprehension)
Becoming tired quickly /
reduced ability to concentrate
Reduced wellbeing
High blood pressure
Damage to hearing
Cardivascular illness
Stress
!
� Office noise -> silent stress factor that often
unknowingly influences the performance and wellbeing
of the employee significantly� Frequent consequences: � low performance capability
� psychosomatic illness
LEARNING OBJECTIVESCPD Agenda
• Introduction to REHAU
• Introduction to Acoustic Science
•Definition
•Examples
•Science
© REHAU
•Science
• Regulation
• Product Solution
• Project Gallery
• Learning Materials
SOURCES OF NOISEArchitectural Acoustics vs. Room Acoustics
Transferred sound level
60dB
80dB sound level
© REHAU
Sound transfer between adjoining rooms Acoustic quality within a room
����Insulation
ARCHITECTURAL ACOUSTICS ROOM ACOUSTICS
! ! What surfaces can I use to create ideal auditory conditions?
What proportion of the sound comes out on the other side of the component being examined?
����Damping / Absorption
LEARNING OBJECTIVESCPD Agenda
• Introduction to REHAU
• Introduction to Acoustic Science
•Definition
•Examples
•Science yes or no?
© REHAU
•Science yes or no?
• Regulation
• Product Solution
• Project Gallery
• Learning Materials
few vibrations per second
Low tone
many vibrations per second
High tone
Time
Acoustic pressure leve l/ sound level
FUNDAMENTALS OF A SOUND WAVEWhat is sound?
© REHAU
Range of audibility
Music
Speech
Infrasound Ultrasound16
16
20,000
16,000
63 8,000
Frequency in Hertz
200 2,000Range in which speech is perceivedLow tone range High tone range
Harmonics
•Harmonics•Fundamental or lowest•Integral multiples
FUNDAMENTALS OF A SOUND WAVE
© REHAU
RELATIONSHIP BETWEEN FREQUENCY & WAVE LENGTHHigher frequency shorter wave length
•Speed of sound• 344m/s (in air)
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MEASUREMENT OF SOUND ENERGYuPa and dB
•Logarithmic Scale
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The standard reference sound pressure in air or other gases is 20 µPa, which is usually considered the
threshold of human hearing (at 1 kHz).
uPa and dB
Phone ringing
MEASUREMENT OF SOUND ENERGY
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Threshold of human hearing
Telephone conversation
phon
•Levels of equal loudness•The Human Ear
•20 Hz to a maximum of around 20,000 Hz•most sensitive between 2 and 5 kHz,
MEASUREMENT OF SOUND ENERGY
© REHAU
2 and 5 kHz,
Metres
•A Weighted Sound Level
MEASUREMENT OF SOUND ENERGY
© REHAU
SOUND REFLECTIONRoute & impact
•Reflection•Diffraction•Absorption
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SOUND IN CONFINED SPACESEnergy Path
Sound is bounced back
1Reflection
Sound is "dispersed"
2 Diffusivity
(diffuse reflection)
3Absorption
Sound is "transferred"
4Transmission
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Reverberation
•Incident•Reflected•Absorbed•Transmitted•Structure Bourne SoundAdd details
RECOMMENDATION
� Time that a sound in a room requires to become inaudible
� Technical: Sound pressure level in the room reduces by 60 dB
� Extent depends on the frequency
� Reverberation periods that are too long have an increased noise level and poor speech comprehension as a consequence
SOUND IN CONFINED SPACES
© REHAU
Reflection
RECOMMENDATION
�Office: 0.5 – 0.8 Sec.
�Church: 4 – 8 Sec.
IT'S ECHOING SO MUCH!Skip
Barriers- Reflection and Diffraction
•Wave Length•Obstacle Size
Dec
reas
ing
Fre
quen
cy
Dec
reas
ing
Bar
rier
Hei
ght
RELATIONSHIP BETWEEN FREQUENCY & WAVE LENGTH
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Dec
reas
ing
Fre
quen
cy
Dec
reas
ing
Bar
rier
Hei
ght
Source
Barriers- Reflection and Diffraction
RELATIONSHIP BETWEEN FREQUENCY & WAVE LENGTH
© REHAU
SOUND REDUCTIONMeasurement of reduction
•Dn Tw•Rw
© REHAU
•dB•BS EN ISO 140-4 Measurement Procedure for Airborne Noise transmission’.
Typically, an Rw is around 5dB higher than the equivalent DnT,w figure..
SOUND REDUCTIONMeasurement of reduction
Sound absorption coefficients .
α = Ia / Ii (1)where
© REHAU
Ia = sound intensity absorbed (W/m2)Ii = incident sound intensity (W/m2)
LEARNING OBJECTIVESCPD Agenda
• Introduction to REHAU
• Introduction to Acoustic Science
•Definition
•Examples
•Science
© REHAU
•Science
• Regulation
• Product Solution
•Project Gallery
• Learning Materials
DESIGN REQUIREMENTSGuidelines for Community Noise
•Non Industrial Noise sources•40% EU Exposed to traffic in excess 55 dB(A)•Complex relationship -environmental noise and
© REHAU
environmental noise and people.
The control of Noise at work Regulations 2005
•The lower exposure action values are:•a daily or weekly personal noise exposure of 80 dB (A-weighted);
DESIGN REQUIREMENTS
© REHAU
weighted);•a peak sound pressure of 135 dB (C-weighted).
Building Regulations Part E
•Primarily Domestic•Testing or Robust Details* to comply•E4 covering Schools
DESIGN REQUIREMENTS
© REHAU
* a range of constructions which have been demonstrated to exceed Part E standards by at least 5dB.
CE marking
•Construction Products Regulations:
•Mechanical resistance and stability•Safety in case of fire•Hygiene, health and environment•Safety & accessibility in use•Protection against noise
DESIGN REQUIREMENTS
© REHAU
•Protection against noise•Energy economy and heat retention•Sustainable use of natural resources
•EN 14351 CE marking of Windows & Doors•Annex B Determination of Sound Insulation of windows
Absorber classα W-value
250 – 4,000 HZEffect
A 0.90 – 1.00 Optimum
B 0.80 – 0.85 Favourable
DESIGN REQUIREMENTSAbsorption Classifications according to DIN EN 11654
© REHAU
C 0.60 – 0.75 Still favourable
D 0.30 – 0.55 Not favourable
E 0.15 – 0.25 Not sufficient
Not classified 0.00 – 0.10 -
LEARNING OBJECTIVESCPD Agenda
• Introduction to REHAU
• Introduction to Acoustic Science
•Definition
•Examples
•Science
© REHAU
•Science
• Regulation
• Product Solutions
• Project Gallery
• Learning Materials
360° ACOUSTIC IMPROVEMENTSMaximise sound insulation, Minimise sound creation, Maximise sound absorbtion
Minimise sound
creation
Maximise sound absorption
© REHAU
Maximise sound
insulation
MAXIMISE SOUND INSULATION
• Window Systems Designed to Reduce Sound Transmission:Should be air tightShould be fitted and sealed properly against the substrateNo air ventilators in the frame
• MULTI-CHAMBER DESIGNProvide up to 35% better sound insulation by reducing soundtransmission by up to 40 dB due to effective sealing
Window Systems - Acoustic Testing EN14351 Annex B
© REHAU
• DUAL GASKETSDual protective seals assures tightness of the window systemsand act as an excellent barrier against air and sound infiltration
• Triple Glazing Maximize the gap between the layers of glass (min 30 mm total)Alternate the thickness on the different layers of glass
Window Systems - Acoustic Testing EN14351 Annex B
MAXIMISE SOUND INSULATION
© REHAU
•Test Results available for:•Casement windows•Tilt & Turn•Sliding sash
Passive Haus
Windows
Window Systems
•Tilt & Turn style•Ultra low U Value•Passivhaus Certified.
© REHAU
Controlled Ventilation - How earth tubes or ground-air heat exchangers work?
Summer operation of a GAHE Winter operation of a GAHE
MAXIMISE SOUND INSULATION
© REHAU
Earth Tubes or Ground-Air Heat Exchanger
QE School, Wimborne, Dorset
- Flow rate: 36,000 m3/h
- 3 Tichelmann grids, each 60m long
- DN1200 header pipe
- 60 AWADUKT Thermo runs of DN250, total length of 3,500m
© REHAU
- BSF ‘Pathfinder’ school
Minimise sound
creation
Maximise sound absorption
360° ACOUSTIC IMPROVEMENTSMaximise sound insulation, Minimise sound creation, Maximise sound absorbtion
© REHAU
Maximise sound
insulation
MINIMISE SOUND CREATIONAcoustic sound management at the source
An efficient way to reduce noise level within a building/room is to tackle avoidable internal noise sources:
Structural internal noise sources:
• Air condition
• Ventilation
© REHAU
Structural internal noise sources:
• Water pipes
• Drainage system
- Flexible
- Clean
- Low cost
- Maintenance free
Polymer Pipe Systems – Polymer has grown in the market against steel & copper
MINIMISE SOUND CREATION
© REHAU
- Maintenance free
-Silent
- Environmentally friendly
UP TO 4X LESS NOISE
Proven by German Institute “Fraunhofer Institute for Structural Physics, Stuttgart”:
Sound Pressure Level different to Copper:LA=12.7dB(A)
Quiet library
Polymer Pipe Systems – Maximum Acoustic Performance
MINIMISE SOUND CREATION
© REHAU
Every 3 dB(A) reduction = noise reduction of 50%.
Polymer Copper
Sound Insulation Waste Water Technology
MINIMISE SOUND CREATION
© REHAU
Sound Insulation Waste Water Technology
MINIMISE SOUND CREATION
© REHAU
1. Multi-layer Mineral-reinforced PIPES
2. Sound Absorbing BENDS
3-5. Sound-dampening BRACKETS
Comparison of Acoustic Performance of Different Acoustic Systems
(tested by Frauenhofer Institute for Building Physics, Stuttgart, Germany according to EN 14366)
30% less noise generated
VDI 4100 (III)
DIN 4109
Noise reduction pipe creates 30% Less Noise
MINIMISE SOUND CREATION
© REHAU
VDI 4100 (III)
NR Pipe CAST IRONOTHER
PP
a) Surface Heating & Cooling System
• Floor
• Wall
• Ceiling
Sub-Surface/ Structure Heating and Cooling
MINIMISE SOUND CREATION
© REHAU
b) Structure Cooling System (Thermally Active Building)
• Concrete Structure
b) Structure Coolinga) Surface Heating & Cooling
radiation radiation
MINIMISE SOUND CREATION
Sub-Surface/ Structure Heating and Cooling
© REHAU
radiation radiation
No noisy air blowers or space heaters due to closed system of under floor water pipes
Sub-Surface/ Structure Heating and Cooling
Construction
Automotive
Industry
www.rehau.co.uk
Minimise sound
creation
Maximise sound absorption
360° ACOUSTIC IMPROVEMENTSMaximise sound insulation, Minimise sound creation, Maximise sound absorbtion
© REHAU
Maximise sound
insulation
Within rooms, sound diffuses spherically
Depending on the surface on which the
sound waves hit, sound can be…
• Absorbed
MAXIMISE SOUND ABSORPTION Behaviour of sound in a room
© REHAU
• Reflected
• Diffused
Ceiling, floor, walls, furniture all play a role
� The larger the volume of absorption material, the lower the sound level
Why are open-plan environments Acoustically Demanding?
Characteristics of open-plan areas:
- Large floor area
- High ceilings
- Limited wall area
Modern architecture favors:
- Steel
- Glass
MAXIMISE SOUND ABSORPTION
© REHAU
- Glass
- Concrete
The result…
� Limited absorption area
� Sound reflection
� Long reverberation time
� POOR ROOM
ACOUSTICS
Designing a room for Maximum Acoustic Comfort
Room without sound absorption
Sound insulation
MAXIMISE SOUND ABSORPTION
© REHAU
Sound insulation
Room with sound absorption through furniture, ceiling, wall and floor elements � A Holistic Approach
Sound insulation
CEILING
WALLS
Designing a room for Maximum Acoustic Comfort
MAXIMISE SOUND ABSORPTION
© REHAU
Sound insulation
FURNITURE
FLOOR
ROOM ACOUSTIC FURNITURE SOLUTIONS
Shielding and
© REHAU
absorption in the
background
ACOUSTIC SOLUTIONSAcoustic Chilled Ceiling
Acoustics Ceiling - Heating & Cooling
� High cooling performance
� Easy to install
� Flexible ceiling design
� Can be combined with 15mm standard
plasterboard
� Good control response
� Short reaction times
© REHAU
� Short reaction times
� Combines well with partial and full
climate-control systems
ACOUSTIC SOLUTIONSAcoustic Chilled Ceiling
Schallabsorptionen REHAU Akustikheiz-/-kühldecke
(Hallkabinenmessung)
0,7
0,8
0,9
1,0
Sac
hh
abso
rptio
n α
s
6/18 R
8/18 R
8/18 Q
The sound absorption measurement depends on the hole pattern (Reason: open hole proportion*)
Hole 6/18 Rregular round hole
* 15.5%
* 8.7 %
So
un
d a
bso
rpti
on
co
efic
ien
t
© REHAU
0,0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Frequenz [Hz]
Sac
hh
abso
rptio
n α
s
Hole 8/18 Rregular square hole
Hole 8/18 Rregular round hole
* 19.8 %
So
un
d a
bso
rpti
on
co
efic
ien
t
Frequency [Hz]
ACOUSTIC SOLUTIONSOn the Work Front
© REHAU
ACOUSTIC SOLUTIONSOn the Work Front
© REHAU
fixed screen split screen lift screen partition
Sound absorption trend
� Sound absorption rate
αw = 0.8 (Class B)
� Acoustic active 12 mm (Cabinet
SOUND ABSORBTIONOn the Furniture Front
© REHAU
with folders)
� Acoustic active 12 mm (Cabinet
without folders)
Fre
qu
ency
[Hz]
ACOUSTIC SOLUTIONSWORKS SCREEN
Sound absorption trend
� WORKS split screen
αw = 0.75 (Class C)
� WORKS lift screen
αw =0.85 (Class B)
� WORKS fixed screen / partition
Sound absorption coeficient
© REHAU
� WORKS fixed screen / partition
αw = 0.80 (Class B)
ACOUSTIC SOLUTIONS VIDEO
© REHAU
ACOUSTIC SOLUTIONSCarpets & other fixture & fittings
High frequencies
Porous absorber
�E.g.: Textiles, non-woven material, carpet, foam, mineral wool,
cotton, acoustic plaster
�Sound (energy) is turned into thermal energy
�By slowing down the air particles (friction)
(Micro) perforated absorber
�E.g.: Perforated board with lots of small holes
�Sound (energy) is turned into thermal energy
�Friction loss of air in the holes
© REHAU
LEARNING OBJECTIVESCPD Agenda
• Introduction to REHAU
• Introduction to Acoustic Science
•Definition
•Examples
•Science
© REHAU
•Science
• Regulation
• Product Solution
• Project Gallery
• Learning Materials
Construction
Automotive
Industry
www.rehau.co.uk
© REHAU
LEARNING OBJECTIVESCPD Agenda
• Introduction to REHAU
• Introduction to Acoustic Science
•Definition
•Examples
•Science
© REHAU
•Science
• Regulation
• Product Solution
• Learning Materials
• Project Gallery
RESOURCESAdditional Information References
•Harris, Cyril M. Noise Control in Buildings: A Guide for Architects and
Engineers. New York: McGraw-Hill, 1994
•Moser ,Michael Engineering Acoustics An Introduction to Noise Control
Springer Dordrecht Heidelberg London New York 2009
•www.who.int/docstore/peh/noise/guidelines2.html
© REHAU
•www.who.int/docstore/peh/noise/guidelines2.html
•www.hse.gov.uk/pubns/indg362.pdf
•www.ioa.org.uk/ The Institute of Acoustics
•www.robustdetails.com
LEARNING OBJECTIVESNow you should
• Understand the basic Principles of acoustics
• Design Standards relevant to noise control
• Incorporating Sound Reduction measures across a project
© REHAU
Construction
Automotive
Industry
www.rehau.co.uk
Thank You for Your Attention. Any Questions?