Workshop on Industrial Noise Calculations

Content 1.Previously… 2.Representative operations for noise emission 3.Sound Power Levels 4.Calculation model 5.Calculations 6.Validation of calculations 7.Topographic data, contours 8.Conclusions Workshop on Industrial Noise Calculations 2

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

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

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

1.Previously… 2nd training mission February 2012 Noise from industrial sites - Henk Wolfert Noise calculations according to ISO 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 Workshop on Industrial Noise Calculations EPA Formula: L fT = L W +D c -A A =A div +A atm +A gr + A bar +A misc

1.Previously… 2nd training mission February 2012 Noise from industrial sites - Henk Wolfert Workshop on Industrial Noise Calculations EPA D z =10lg[3+(c 2 /λ)c 3 zK met ] per pathway C 2 = 20 (due to ground effect) C 3 = 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) K met = meteo correction,see ISO K met =exp[-(1/2000 √ d ss.d sr.d/2z)] EPA At least 10 kg/m 2 Max. Reduction dB Shape and top are important!! Screening by obstacles

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

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

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

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

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

2.Representative operations for noise emission What 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 -> 13 th 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 Workshop on Industrial Noise Calculations EPA

2.Representative operations for noise emission How 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 Workshop on Industrial Noise Calculations EPA

2.Representative operations for noise emission Case Port of Beograd Open GeoMilieu and open Project GeoMilieu Models Open model Case Workshop on Industrial Noise Calculations EPA

2.Representative operations for noise emission Case Port of Beograd Workshop on Industrial Noise Calculations EPA

3.Sound Power Level of relevant noise sources Method 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 m 2 production surface Workshop on Industrial Noise Calculations EPA

3.Sound Power Level of relevant noise sources Noise 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 Workshop on Industrial Noise Calculations EPA

3.Sound Power Level of relevant noise sources SPL 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 Workshop on Industrial Noise Calculations EPA

3.Sound Power Level of relevant noise sources Case Port of Beograd Literature data of crane: 85 dB(A) at 10 meters Workshop on Industrial Noise Calculations EPA

4.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 Workshop on Industrial Noise Calculations EPA

4.Calculation model Case Port of Beograd Workshop on Industrial Noise Calculations EPA

5.Calculations Case Port of Beograd Workshop on Industrial Noise Calculations EPA

Thank you for your attention! Are there any questions? Hans van der Waal training G2G Serbia 24