Designing of noise barrier

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Designing of noise barrier

  1. 1. Designing of Noise Barrier Lalit Aggarwal P2009ME1088 Gayathri Lakshmi K. P2009ME1062
  2. 2. Problem description• Aim• Experimental• Formulation in MATLAB• Modeling using software Designing of Noise Barrier 2
  3. 3. Index• Experiment• Formulation in MATLAB – Comparison with experimental results – MATLAB GUI• Modeling using software OLT – Comparison with experimental results – Analysis using software Designing of Noise Barrier 3
  4. 4. Experiment on hard ground Designing of Noise Barrier 4
  5. 5. Designing of Noise Barrier 5
  6. 6. Insertion loss due to a semi-infinite barrier• LAM Method – Diffraction based model – Based on the path difference – Summing the contribution of each path – Applicable for hard ground, thin and semi-infinite barrier. Designing of Noise Barrier 6
  7. 7. Paths considered in LAM Method Designing of Noise Barrier 7
  8. 8. MATLAB GUI Designing of Noise Barrier 8
  9. 9. Comparison Designing of Noise Barrier 9
  10. 10. Comparison Designing of Noise Barrier 10
  11. 11. Height Variation 35 30 25 Insertion Loss(in dB) 20 1000 Hz 1259 Hz 1995 Hz 15 3162 Hz 3981 Hz 10 5 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Barrier height(in m)Reference: Olive Lab Tree Terrain Designing of Noise Barrier 11
  12. 12. Required Thickness • Mass Law TL=20*log(m)+20*log(f/100)-7 m=surface density f= frequencyReference: http://rwsc2.inforce.dk/sw98684.asp Designing of Noise Barrier 12
  13. 13. barrier thickness Material: Glasswool 0.12 Flow resistivity=20000 Pas/m2 0.1 0.08barrier thickness(in m) 0.06 barrier thickness 0.04 0.02 0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 Frequency(in Hz) Designing of Noise Barrier 13
  14. 14. Thickness Variation Material: Glasswool 30 Flow resistivity=20000 Pas/m2 25 20 Insertion Loss(in dB) 15 thickness_3cm thickness_3.5cm thickness_4cm 10 thickness_4.5cm 5 0 0 10 20 30 40 50 60 -5 Receiver distance (in m)Reference: Olive Lab Tree Terrain Designing of Noise Barrier 14
  15. 15. Single panel barrier Double panel barrierReference: Olive Lab Tree Terrain Designing of Noise Barrier 15
  16. 16. Insertion Loss variation in double panel barriers 45 40 Frequency = 1000 Hz 35 30 25 single panel double panel_gap10cm Insertion Loss(in dB) double panel_gap20cm 20 double panel_gap 30cm double panel_gap50cm 15 double panel gap 40 cm 10 5 0 0 2 4 6 8 10 12 Receiver distance(in m)Reference: Olive Lab Tree Terrain Designing of Noise Barrier 16
  17. 17. Insertion Loss variation in double panel barriers 45 40 Frequency = 2000 Hz 35 30 Insertion Loss(in dB) 25 single panel double panel_gap10cm double panel gap 20 cm 20 double panel_gap 30cm double panel_gap 40 cm 15 double panel_gap50cm 10 5 0 0 2 4 6 8 10 12 Receiver distance (in m)Reference: Olive Lab Tree Terrain Designing of Noise Barrier 17
  18. 18. Variation in flow-resistivity 35 30 25 20 IL(in dB) 2.54 cm glasswool (20000) 2.54 cm glasswool (50000) 15 5.1 cm glasswool(20,000) gypsum_4,200,000 10 5 0 0 2 4 6 8 10 12 distance from barrier(in m)Reference: Olive Lab Tree Terrain Designing of Noise Barrier 18
  19. 19. Future Work• Experimental Results of Material Selection and double panel and comparison• Sysnoise design includes shape variation• Matlab for thick barrier 19
  20. 20. ReferencesResearch Papers• A. Muradali and K. R. Fyfe, A Study of 2D and 3D Barrier Insertion Loss using Improved Diffraction-based Methods, Applied Acoustics, Vol. 53, No. I-3, pp. 49-15, 1998• Maekawa, Z., Noise reduction by screens. Applied Acoustics, 1968, 1, 157- 173.• D. C. HOTHERSALL, S. N. CHANDLER-WILDE AND M. N. HAJMIRZAE, EFFICIENCY OF SINGLE NOISE BARRIERS, Journal of Sound and Vibration (1991) 146(2), 303-322Others:• Report on DESIGN THE NOISE BARRIER FOR THE BAFFLE RANGE by Sahil Bhagat.• http://en.wikipedia.org/wiki/Noise_barrier 20

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