Designing of noise barrier
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Designing of noise barrier

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Presentation of B.Tech Project work( Designing of Noise barrier).

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Designing of noise barrier Designing of noise barrier Presentation Transcript

  • Designing of Noise Barrier Lalit Aggarwal P2009ME1088 Gayathri Lakshmi K. P2009ME1062
  • Problem description• Aim• Experimental• Formulation in MATLAB• Modeling using software Designing of Noise Barrier 2
  • 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
  • Experiment on hard ground Designing of Noise Barrier 4
  • Designing of Noise Barrier 5
  • 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
  • Paths considered in LAM Method Designing of Noise Barrier 7
  • MATLAB GUI Designing of Noise Barrier 8
  • Comparison Designing of Noise Barrier 9
  • Comparison Designing of Noise Barrier 10
  • 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
  • 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
  • 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
  • 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
  • Single panel barrier Double panel barrierReference: Olive Lab Tree Terrain Designing of Noise Barrier 15
  • 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
  • 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
  • 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
  • Future Work• Experimental Results of Material Selection and double panel and comparison• Sysnoise design includes shape variation• Matlab for thick barrier 19
  • 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