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Workshop on Industrial Noise Calculations

Workshop on Industrial Noise Calculations. Richard.spaans@dcmr.nl Hans.vanderwaal@dcmr.nl. Content. Previously… Representative operations for noise emission Sound Power Levels Calculation model Calculations Validation of calculations Topographic data, contours Conclusions.

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Workshop on Industrial Noise Calculations

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  1. Workshop on Industrial Noise Calculations Richard.spaans@dcmr.nl Hans.vanderwaal@dcmr.nl

  2. Content Previously… Representative operations for noise emission Sound Power Levels Calculation model Calculations Validation of calculations Topographic data, contours Conclusions Workshop on Industrial Noise Calculations

  3. Previously…2nd training mission February 2012Noise from industrial sites - Henk Wolfert EPA Data from enterprises and vicinity Definition of input, conversion Noise calculations Validation Production of contours Presentation Noise from source to receiver 22-9-2014 Workshop on Industrial Noise Calculations 3

  4. Previously…2nd training mission February 2012Noise from industrial sites - Henk Wolfert EPA Free field measurement (ISO 3744) 22-9-2014 Workshop on Industrial Noise Calculations 4

  5. Previously…2nd training mission February 2012Noise from industrial sites - Henk Wolfert EPA Enveloping measurement surface (ISO 3746) 22-9-2014 Workshop on Industrial Noise Calculations 5

  6. Previously…2nd training mission February 2012Noise from industrial sites - Henk Wolfert Noise calculations according to ISO 9613-2 Divergence (distance reduction) Atmospheric absorption Ground effect (absorption/reflection) Screening by barriers/objects, etc Reflections near receptor Miscellaneous effects, like Reductions in residential areas/installations Propagation through forests EPA Formula: LfT = LW +Dc -A A =Adiv+Aatm+Agr+Abar+Amisc 22-9-2014 Workshop on Industrial Noise Calculations 6

  7. Previously…2nd training mission February 2012Noise from industrial sites - Henk Wolfert EPA EPA Screening by obstacles Dz=10lg[3+(c2/λ)c3zKmet] per pathway C2= 20 (due to ground effect) C3= 1 for single barriers For double: C3=[1=(5 λ/e)2]/[(1/3)+(5 λ/e)2] λ – wavelength Z=diffraction direct-indirect e=distance between edges (2) Kmet= meteo correction,see ISO Kmet=exp[-(1/2000√dss.dsr.d/2z)] Shape and top are important!! Max. Reduction 15-20 dB At least 10 kg/m2 22-9-2014 Workshop on Industrial Noise Calculations 7

  8. Previously…2nd training mission February 2012Noise from industrial sites - Henk Wolfert EPA 22-9-2014 Workshop on Industrial Noise Calculations 8

  9. Previously…1st training mission November 2011G2G Training – Momir Prascevic, PhD EPA 22-9-2014 Workshop on Industrial Noise Calculations 9

  10. Previously…1st training mission November 2011G2G Training – Momir Prascevic, PhD EPA 22-9-2014 Workshop on Industrial Noise Calculations 10

  11. Previously…1st training mission November 2011G2G Training – Momir Prascevic, PhD EPA 22-9-2014 Workshop on Industrial Noise Calculations 11

  12. Previously…1st training mission November 2011G2G Training – Momir Prascevic, PhD EPA 22-9-2014 Workshop on Industrial Noise Calculations 12

  13. Representative operations for noise emissionWhat to do? Determine relevant noise sources for noise emission Depends on the evaluation parameter Lden or Lday and Lnight: averaging over 1 year NL: 12 days with incidental operations are excluded -> 13th busiest day is determinative For example: unloading chemical tankers with deepwell pumps 1 day per week Averaging over 1 year -> -8 dB (1/7) NL: -0 dB EPA 22-9-2014 Workshop on Industrial Noise Calculations 13

  14. Representative operations for noise emissionHow to do? Visit the company Interview an operations manager and determine: Relevant noise sources for Sound Power Level The noisiest ones first... Relevant noise sources for quantity and operating time A lot of little ones makes a big one... EPA 22-9-2014 Workshop on Industrial Noise Calculations 14

  15. Representative operations for noise emissionCase Port of Beograd Open GeoMilieu and open Project GeoMilieu Models Open model Case 01 http://binged.it/zcNpXZ http://binged.it/x505lZ EPA 22-9-2014 Workshop on Industrial Noise Calculations 15

  16. Representative operations for noise emissionCase Port of Beograd EPA 22-9-2014 Workshop on Industrial Noise Calculations 16

  17. Sound Power Level of relevant noise sourcesMethod of determination Choose a method of determination SPL Noise measurements Most accurate and customized Sometimes difficult due to background noise Labor intensive Literature data Previous surveys Databases, literature, publications Data delivered by manufacturers Emission value per m2 production surface EPA 22-9-2014 Workshop on Industrial Noise Calculations 17

  18. Sound Power Level of relevant noise sourcesNoise measurements Point sources: ISO 3744 Surface sources: ISO 3746 Noise emitting buildings: HMRI II.7 (NL) Sound pressure level inside building + sound insulation of façade elements -> SPL surface source EPA 22-9-2014 Workshop on Industrial Noise Calculations 18

  19. Sound Power Level of relevant noise sourcesSPL from literature Acquire all technical data of noise source SPL from databases Source DB (linked to Predictor/GeoMilieu) Harmonoise database SPL from literature, publications VDI publications Integrated low-noise design in process industry SPL from manufacturer data Beware of SPL measurements (Sound Pressure Level) instead of Sound Power Level! Acquire all input data according to Appendix 3 EPA 22-9-2014 Workshop on Industrial Noise Calculations 19

  20. Sound Power Level of relevant noise sourcesCase Port of Beograd Literature data of crane: 85 dB(A) at 10 meters EPA 22-9-2014 Workshop on Industrial Noise Calculations 20

  21. Calculation model Acquire input data of noise sources according to Appendix 3 (required input data industrial noise calculations) From operations manager (during interview) During noise measurements From data sheets of manufacturer or literature Acquire input data of surroundings and objects Topographical maps Altitude data of the terrain and buildings Acquire input data of calculation points or grids Calculation points at dwellings Grid for calculation of contours EPA 22-9-2014 Workshop on Industrial Noise Calculations 21

  22. Calculation modelCase Port of Beograd EPA 22-9-2014 Workshop on Industrial Noise Calculations 22

  23. CalculationsCase Port of Beograd EPA 22-9-2014 Workshop on Industrial Noise Calculations 23

  24. Thank you for your attention! Are there any questions? 22-9-2014 Hans van der Waal• training G2G Serbia 24

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