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Applied Acoustics - In Class test - 11/12/2017
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N.TimestampEmail addressSurname and NameMatriculaScoreBonus
Tot.Score
1) The traffic along a road, during the day period (06-22), is of 10000+E·1000 cars. Compute the SEL of a single car pass-by, knowing that the total value of Leq is equal to 60+F dB(A) and that the background noise (when no car is passing) is 55+F dB(A).
2) In the case of previous exercise, re-compute the value of Leq when the distance from the road axis is equal to 50+F m, instead of 7.5m.
3) In the case of exercise 1), compute the value of Lep for the acoustician who attended the measurements, standing at the measurement position for the whole day period.
4) A reverberant room has a volume of 200+EF m³. The initial reverberation time is 6+F/2 s, and reduces to 2+E/5 s when a sample of absorbing material is inserted, having a surface of 10+D/2 m². Compute the sound absorption coefficient α of the sample according to ISO 354.
5) In the case of previous exercise, compute the reduction of the level of reverberant field caused by inserting the sample inside the reverberant room.
6) In a standing wave tube, the Standing Wave Ratio (max pressure / min pressure) is 6+F. Compute the sound absorption coefficient α of the sample according to ISO 10534.
7) In a standing wave tube, the value of rE=I/(D·c) is 0.1+E/30. Compute the sound absorption coefficient α of the sample with the Sound Intensity method.
8) What is the correct definition of the new EC parameter called Lden?
9) What is the correct definition of differential noise limit according to Italian law?
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112/11/2017 18:31:44
alberto.bonici@studenti.unipr.it
Bonici Alberto2794592422659.4 dB72 dB0.83.8 dB0.2340.425
The time-weighted energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between environmental noise level and the residual noise level (which means the total Leq with and without a specific sound source switched on) both measured on short times (a few minutes).
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212/11/2017 18:33:14
riccardo.straccia@studenti.unipr.it
Straccia Riccardo2558141621870.91 dBA55.42 dBA0.8055.6 dB0.330.866
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between environmental noise level and the residual noise level (which means the total Leq with and without a specific sound source switched on) both measured on short times (a few minutes).
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312/11/2017 18:34:34
gabriele.caviola@studenti.unipr.it
Caviola Gabriele2433828210109.60 dBA78.193 dBA66.77 dBA0.1413.32 dBA0.3950.63
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between environmental noise level and the residual noise level (which means the total Leq with and without a specific sound source switched on) both measured on short times (a few minutes).
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412/11/2017 18:35:54
eleonora.oliosi@studenti.unipr.it
Oliosi Eleonora2574632823066.9 dB(A)54.5 dB(A)66.01 dB(A)0.6280.360.462
The time-weighted energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between environmental noise level and the residual noise level (which means the total Leq with and without a specific sound source switched on) both measured on short times (a few minutes).
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512/11/2017 18:36:23
marco.morini1@studenti.unipr.it
Morini marco290020162180.88-3.420.490.286
The time-weighted energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
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612/11/2017 18:36:26
lorenzo.zaniboni@studenti.unipr.it
Zaniboni Lorenzo2585582022272.72 dB(A)0.77056-3.8165 dB0.2480.73
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between environmental noise level and the residual noise level (which means the total Leq with and without a specific sound source switched on) both measured on short times (a few minutes).
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712/11/2017 18:37:45
stefano.cavalli2@studenti.unipr.it
Cavalli Stefano2893412422671.5 dB52.30.6823.70.4370.3783
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between environmental noise level and the residual noise level (which means the total Leq with and without a specific sound source switched on) both measured on short times (a few minutes).
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812/11/2017 18:40:51
gianmarco.carraglia@studenti.unipr.it
Carraglia Gianmarco2898031221473.1 dB(A)0.850667-4.738 dB0.360.9
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between environmental noise level and the residual noise level (which means the total Leq with and without a specific sound source switched on) both measured on short times (a few minutes).
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912/11/2017 18:41:41
emanuele.pagliari@studenti.unipr.it
Emanuele Pagliari2584401621874.6 dB53.4 dB0.61-2.62 dB0.4890.766
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between environmental noise level and the residual noise level (which means the total Leq with and without a specific sound source switched on) both measured on short times (a few minutes).
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1012/11/2017 18:42:29
jodi.oxoli@studenti.unipr.it
Jodi Oxoli2586701221452.6550.421.350.490.67
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between environmental noise level and the residual noise level (which means the total Leq with and without a specific sound source switched on) both measured on short times (a few minutes).
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11CartaceoTrunilina Alina289054404
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between Leq,day and Leq,night
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12CartaceoJuras Lucenic931993000105.6 dB96.5 dB
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between the SPL outside (at 1m from the closed window) and the SPL inside the room
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13CartaceoKilchitsky Egor2890498081.041.040.230.77
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between Leq,day and Leq,night
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14CartaceoOsadchy Kirill2890504041150.2230.490.285
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between Leq,day and Leq,night
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15CartaceoKirilyuk Anton289051000109-5.7
The energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between Leq,day and Leq,night
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16CartaceoToscani Andrea1037542802868.19 dB(A)55.43 dB(A)67.01 dB(A)0.6274.26 dB0.3310.733
The time-weighted energetic average between Lday, Levening, Lnight, where Levening is increased by 5 dB and Lnight is increased by 10 dB
The difference between environmental noise level and the residual noise level (which means the total Leq with and without a specific sound source switched on) both measured on short times (a few minutes).
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Notes:
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Wrong or mispelled measuring unit
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Comma instead of decimal point
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