Getting to Grips with Aircraft Noise

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9 - A BIT OF THEORY 9.5.7.3.2. Considering three periods in a day 78 L WECPN = ⎡1 ⎛ 10log 10 ⎢⎢ 2 ⎜⎜ ⎣ ⎝ L ECPNday ( 0700−1900 ) 10 ⎞ 1 ⎛ + 10 ⎟⎟ ⎜⎜ ⎠ 8 ⎝ L ⎞ 3 ⎛ + 10 ⎟⎟ ⎜⎜ ⎠ 8 ⎝ ECPNevening ( 1900− 2200 ) + LECPNnight ( 2200− 0700) 10 5 + 10 ⎞⎤ + S ⎟⎟ ⎠⎥⎥ ⎦ Where: LECPN is the equivalent continuous perceived noise level for the considered period S is a seasonal adjustment which values are recapitulated in the following table Cold months (temperature above 20°C for less than 100 hours per month) Temperate months (temperature above 20°C for more than 100 hours per month but above 25.6 not for more than 100 hours) Flight Operations Support & Line Assistance Getting to grips with aircraft noise 10 Hot months (temperature above 25.6°C for more than 100 hours per month) -5 dB 0 dB +5 dB 9.5.8. DAY-EVENING-NIGHT LEVEL (LDEN) For long-term noise exposure, LDEN has a proven relation with the degree of community noise annoyance and particularly with the percentage of highly annoyed respondents. LDEN, in combination with special dose-effect relations, is also applicable in the following cases: • Annoyance due to noise with strong tonal components • Annoyance due to noise with an impulsive character • Adverse effects on learning by children The definition of the LDEN is similar to the CNEL, the weighing factor for evening only being different. ⎡ ⎡ ni − nj AE ( i ) day[ 0700 1900] LAE ( j ) evening[ 1900− 2200] nk 1 LDEN = 10 . log ⎢⎣ ∑ + 10 10 5∑10 + 10∑ ⎢⎢ ⎣86400 i = 1 j= 1 k = 1 L LAE ( k ) night [ 2200− 0700] 10 10 10 Where: LAE(i) corresponds to the Sound Exposure Level of a given procedure. ⎤⎤ ⎥⎦ ⎥⎥ ⎦
9.5.9. SOME INDICES USED IN DIFFERENT COUNTRIES COUNTRY NOISE INDEX United Kingdom Noise and Number Index (NNI) France Psophic Index (IP) Germany Equivalent sound level (Leq) United States, (California) Community Noise Equivalent Level (CNEL) Flight Operations Support & Line Assistance Getting to grips with aircraft noise 9 - A BIT OF THEORY Japan Weighted Equivalent Continuous Perceived Noise Level (WECPNL) Netherlands Kosten Index (Ke) Australia Australian Noise Exposure Forecast (ANEF) 79
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Getting to Grips with Aircraft Noise

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