noise exposure forecast at workplaces - bruit · accordance with iso 11204 prediction in the...
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Noise exposure forecast at workplaces
BUY QUIET 2016
Wolfgang Probst
DataKustik GmbH · Dornierstr. 4 ·
82205 Gilching · Germany
Tel: +49 8105 77467 – 111
www.datakustik.com
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SERT (Sound Energy Ray Tracing)
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Measurements in 122 industrial halls have been performed during development of
guideline VDI 3760 with financial support of BAuA
German guideline to calculate sound propagation:
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Measurements along straight paths with dodecahedron as calibrated source
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Data to describe room, source, path and measured
sound pressure levels
Model of the room with machinery and path
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Comparison of measured levels with those calculated with SERT-method : Room AF00116 empty
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Comparison of measured levels with those calculated with SERT-method : Room AF00116 with absorbing ceiling
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Comparison of measured levels with those calculated with SERT-method : Room AF00116 with absorbing ceiling
and machinery installed
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50%
Statistical analysis of the deviations for 122 halls: mean value < ± 1 dB, 50% < ± 2 dB
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Emission of sources
Machine directive 2006/42/EC
Immission at workplaces Technical Layout and
architectural design
Noise prediction
Physical Agents
Noise Directive 2003/10/EC
Lower exp. action value Lex,8h = 80 dB(A)
Upper exp. action value Lex,8h = 85 dB(A) :
:
Emission sound pressure level LpA if > 70 dB(A)
+
Sound power level LWA if LpA > 80 dB(A)
Noise prediction with software techniques links the requirements of Noise directive with declared emission values
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Speaking person Simulation as point source
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source receiver
Energy related impulse response
Time
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Detailed modeling of a washing machine
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Washing machine in a room Free field calculated noise map
(only ground reflection included) Noise map with all relevant reflections
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Modeling of a complex machine as a box (equal to reference surface acc. to ISO 3744)
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Gravure printing machine Simulation with 4 radiating stations
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Radiating areas
Operators position
Emission values LWA and LpA Declaration according to machine directive
Radiating areas and source distribution Inspection
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Determination of effectiv radiated sound power level by simulating the enveloping surface method with
receivers on half sphere surface
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SERT-calculation of the level with semi-free-field conditions at the operators position LpA,sim
Emission sound pressure level known (e.g. declared by manufacturer) LpA
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Calculation LpA,sim for M1
Calculation LpA,sim for M2
Data-organisation in object-tree
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Calculation LAp,sim for M1 and M2 (reflections at room surfaces neglected to keep
presentation simple)
For each receiver at a workplace with declared LpA:
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Sound power level LWA Emission sound pressure level LpA
Emission values of Palletizer and Depalletizer - 1981
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98
100
102
104
106
108
0 1 2 3 4 5 6
Sc
ha
llle
istu
ng
sp
eg
el
dB
(A)
Durchsatz in 1000 Ka/h
Ent-Bepalettiermaschinen: Schallleistungspegel LWA
LWA,2
LWA,1
LWA
76
78
80
82
84
86
0 1 2 3 4 5 6Em
iss
ion
s-S
ch
allp
eg
el
dB
(A)
Durchsatz in 1000 Ka/h
Ent-Bepalettiermaschinen: Emissionsschallpegel LpA
LpA,2
LpA,1
LpA
Sound power level LWA Emission sound pressure level LpA
Advices for modelling and source distribution (default)
Proposal for a revision of VDI 4741 - 2016
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Acoustic model of the palletizer machine
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Visualization of sound particles radiated by the palletizer (LWA 104 dB, LpA 82 dB)
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Result from SERT-calculation in room with 6 m height Level at operators position is 87.3 dB(A)
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Simulation of a complete plant with machinery and transport-systems
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Absorbing baffle system at the ceiling
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Absorbing baffle system at the ceiling integrated in the model
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Production-line X13
Machine LWA LpA
Cooler CX14 96 -
Cleaning O+H 104 86
Inspection KR10C 101 84
Filler HuK236 104 83
Labeller KS 45C 99 82
Conveyor 128 108 -
Conveyor 129 101 -
: : :
: : :
What is needed:
The result determined by SERT - simulation:
Production-line X13
Machine LAp +MPack1 +MPack2
Cleaning O+H 89 87 84
Inspection KR10C 88 86 85
Filler HuK236 86 85 84
Labeller KS 45C 86 85 83
: : : :
: : : :
Emission values guaranteed by
the manufacturer
If the predicted LAp values are
exceeded, measurement of LpA in
accordance with ISO 11204
Prediction in the planning phase – from declared emission values to the expected levels at the workplaces
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Thank you for your attention