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CUSTIC software: Noise pollution map produced by three sources (XY-plane)
CUSTIC software: Noise pollution map produced by three sources (XY-plane)
Noise pollution software: environmental engineer, noise pollution control, industrial noise control, environmental engineering, environmental consultancy service, environment simulation, environmental modeling and environmental impact assessment.
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Appendix G
IMPULSE NOISE AND SOME OTHER SPECIAL NOISES
IMPULSE NOISE
Impulse noise is defined in various ways G-1, G-2, G-11 but generally means a discrete noise (or a series of such noises) of short duration (less than a second), in which the sound pressure level rises very rapidly (less than 500 ms, sometimes less than 1 ms) to a high peak level before decaying below the level of background noise. The decay is frequently oscillatory, because of sound reflections and reverberation (ringing) in which case the spectrum of the oscillation may also be important in determining the hazard to hearing. Some authors distinguish reverberant impulse noise as "impact" noise (typically produced by metal to metal impact as in industrial forging), to distinguish it from simple oligophasic impulses (typified by a gunshot in the open air). G-3
The peak sound pressure level (SPL) is an important but not the sole parameter determining hazard. Some typical values for disturbing or hazardous impulse noises are given in Table G-1.
NOTE: Peak SPL for impulses cannot be properly measured with a standard sound level meter, which is a time-averaging device. Oscillographic techniques must be used.
(in dB re 20 micropascals)
| SPL | EXAMPLE |
| 190+ | Within blast zone of exploding bomb |
| 160-180 | Within crew area of heavy artillery piece or naval gun when shooting |
| 140-170 | At shooter's ear when firing hand gun |
| 125-160 | At child's ear when detonating toy cap or firecracker |
| 120-140 | Metal to metal impacts in many industrial processes (e.g., drop-forging; metal-beating) |
| 110-130 | On construction site during pile-driving |
G-1
ENVIRONMENTAL NOISE: FW0 - FW1 - FW2 - FW3 - FW4 - FW5 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - a1 - a2 - a3 - a4 - a5 - a6 - a7 - a8 - a9 - a10 - a11 - a12 - a13 - a14 - a15 - a16 - a17 - a18 - a19 - a20 - a21 - a22 - a23 - a24 - a25 - a26 - b1 - b2 - b3 - b4 - b5 - b6 - b7 - b8 - b9 - b10 - b11 - b12 - c1 - c2 - c3 - c4 - c5 - c6 - c7 - c8 - c9 - c10 - c11 - c12 - c13 - c14 - c15 - c16 - c17 - c18 - c19 - c20 - d1 - d2 - d3 - d4 - d5 - d6 - d7 - d8 - d9 - d10 - d11 - d12 - d13 - d14 - d15 - d16 - d17 - d18 - d19 - d20 - d21 - d22 - d23 - d24 - d25 - d26 - d27 - d28 - d29 - d30 - d31 - d32 - d33 - d34 - d35 - d36 - d37 - d38 - d39 - e1 - e2 - e3 - e4 - e5 - e6 - e7 - f1 - f2 - g1 - g2 - g3 - g4 - g5 - g6 - g7 - g8 - g9 - g10 - g11 - g12 - g13 - g14 - g15
Canarina Algoritmos Numéricos, S.L.
Environmental software solutions
Software para contaminación del medio ambiente
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Islas Canarias,
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Project funded by the European Commission
through the 6th Framework Programme for Research and Development
environmental engineer
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DATA: Input data I - Input data II - Input data III - Input data IV - Input data V - Import and export data - Software commands
ENVIRONMENTAL NOISE: FW0 - FW1 - FW2 - FW3 - FW4 - FW5 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - a1 - a2 - a3 - a4 - a5 - a6 - a7 - a8 - a9 - a10 - a11 - a12 - a13 - a14 - a15 - a16 - a17 - a18 - a19 - a20 - a21 - a22 - a23 - a24 - a25 - a26 - b1 - b2 - b3 - b4 - b5 - b6 - b7 - b8 - b9 - b10 - b11 - b12 - c1 - c2 - c3 - c4 - c5 - c6 - c7 - c8 - c9 - c10 - c11 - c12 - c13 - c14 - c15 - c16 - c17 - c18 - c19 - c20 - d1 - d2 - d3 - d4 - d5 - d6 - d7 - d8 - d9 - d10 - d11 - d12 - d13 - d14 - d15 - d16 - d17 - d18 - d19 - d20 - d21 - d22 - d23 - d24 - d25 - d26 - d27 - d28 - d29 - d30 - d31 - d32 - d33 - d34 - d35 - d36 - d37 - d38 - d39 - e1 - e2 - e3 - e4 - e5 - e6 - e7 - f1 - f2 - g1 - g2 - g3 - g4 - g5 - g6 - g7 - g8 - g9 - g10 - g11 - g12 - g13 - g14 - g15
ALGORITHMS: Algorithms I - Algorithms II
