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Presentation of B.Tech Project work( Designing of Noise barrier).
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Designing of Noise Barrier
Lalit Aggarwal P2009ME1088Gayathri Lakshmi K. P2009ME1062
Designing of Noise Barrier 2
Problem description
• Aim• Experimental• Formulation in MATLAB • Modeling using software
Designing of Noise Barrier 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 4
Experiment on hard ground
Designing of Noise Barrier 5
Designing of Noise Barrier 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 7
Paths considered in LAM Method
Designing of Noise Barrier 8
MATLAB GUI
Designing of Noise Barrier 9
Comparison
Designing of Noise Barrier 10
Comparison
Designing of Noise Barrier 11Reference: Olive Lab Tree Terrain
0.5 1 1.5 2 2.5 3 3.5 4 4.50
5
10
15
20
25
30
35
Height Variation
1000 Hz1259 Hz1995 Hz3162 Hz3981 Hz
Barrier height(in m)
Inse
rtion
Loss
(in d
B)
Designing of Noise Barrier 12
Required Thickness• Mass Law TL=20*log(m)+20*log(f/100)-7 m=surface density f= frequency
Reference: http://rwsc2.inforce.dk/sw98684.asp
Designing of Noise Barrier 13
0 500 1000 1500 2000 2500 3000 3500 4000 45000
0.02
0.04
0.06
0.08
0.1
0.12
barrier thickness
barrier thickness
Frequency(in Hz)
barr
ier t
hick
ness
(in m
)Material: GlasswoolFlow resistivity=20000 Pas/m2
Designing of Noise Barrier 14
0 10 20 30 40 50 60
-5
0
5
10
15
20
25
30
Thickness Variation
thickness_3cmthickness_3.5cmthickness_4cmthickness_4.5cm
Receiver distance (in m)
Inse
rtion
Loss
(in d
B)Material: GlasswoolFlow resistivity=20000 Pas/m2
Reference: Olive Lab Tree Terrain
Designing of Noise Barrier 15
Single panel barrier Double panel barrier
Reference: Olive Lab Tree Terrain
Designing of Noise Barrier 16
1 2 3 4 5 6 7 8 9 10 110
5
10
15
20
25
30
35
40
45
Insertion Loss variation in double panel barriers
single paneldouble panel_gap10cmdouble panel_gap20cmdouble panel_gap 30cmdouble panel_gap50cmdouble panel gap 40 cm
Receiver distance(in m)
Inse
rtion
Loss
(in d
B)
Frequency = 1000 Hz
Reference: Olive Lab Tree Terrain
Designing of Noise Barrier 17
1 2 3 4 5 6 7 8 9 10 110
5
10
15
20
25
30
35
40
45
Insertion Loss variation in double panel barriers
single paneldouble panel_gap10cmdouble panel gap 20 cmdouble panel_gap 30cmdouble panel_gap 40 cmdouble panel_gap50cm
Receiver distance (in m)
Inse
rtion
Loss
(in d
B)
Frequency = 2000 Hz
Reference: Olive Lab Tree Terrain
Designing of Noise Barrier 18
1 2 3 4 5 6 7 8 9 10 110
5
10
15
20
25
30
35
Variation in flow-resistivity
2.54 cm glasswool (20000)2.54 cm glasswool (50000)5.1 cm glasswool(20,000)gypsum_4,200,000
distance from barrier(in m)
IL(in
dB)
Reference: Olive Lab Tree Terrain
19
Future Work• Experimental Results of Material Selection and
double panel and comparison• Sysnoise design includes shape variation • Matlab for thick barrier
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), 303-322
Others: • Report on DESIGN THE NOISE BARRIER FOR THE BAFFLE RANGE by Sahil
Bhagat.• http://en.wikipedia.org/wiki/Noise_barrier