: 1/ dB 1/ Hz 210mm 1/6 1/ Hz 1/3 500Hz 4 315Hz 500Hz?? Hz Hz Hz 315Hz Hz 500Hz
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- せとか もてぎ
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1 93 5 [19] /15 3 2kHz 1/2 85mm 500Hz 2/3
2 : 1/ dB 1/ Hz 210mm 1/6 1/ Hz 1/3 500Hz 4 315Hz 500Hz?? Hz Hz Hz 315Hz Hz 500Hz Hz
3 design frequency : 500Hz design frequency : 315Hz 5.2: normalized SPL [db] Hz 250Hz 315Hz 500Hz Plane Barrier frequency [Hz] 5.3:
4 96 5 1/ /3 20dB 5.1 5m 250Hz 12.5dB 500Hz 16.2dB 2.37m 250Hz 8.4dB 500Hz 12.0dB 14dB 10dB dB Hz 315Hz Hz 315Hz 250Hz 200Hz Hz 315Hz 250Hz 1 200Hz 1/ Hz 6 1/5 250Hz
5 normalized SPL [db] Hz Hz Hz plane barrier frequency [Hz] 5.4: 2 1/4 1/3 3/7 1/4 210Hz 1/3 160Hz 3/7 113Hz /5 1/4 1/3 500Hz 250Hz 1/3 3/2 3/ /6
6 98 5 1/3
7 Design frequency change width 1/5 oct. Design frequency change width 1/4 oct. Design frequency change width 1/3 oct. Design frequency change width 3/7 oct. 5.5:
8 normalized SPL [db] /5 oct. 1/4 oct. 1/3 oct. 3/7 oct plane barrier frequency [Hz] 5.6:
9 [25] 1/3λ 1m 500mm[26] 500mm Hz 5.7:
10 /1 L 1 (v) L 2 (v) L 3 (5.1) (5.3) [25] v (km/h) L n (200) (200km/h) 700 L 1 (200) = 108.5dB(A) L 2 (200) = 88dB(A) L 3 (200) = 97dB(A) 700 [27] [25] L 1 (v) = L 1 (200) + 30 log(v/200) (5.1) L 2 (v) = L 2 (200) + 60 log(v/200) (5.2) L 3 (v) = L 3 (200) + 60 log(v/200) (5.3) m 5m 5m 2.37m 210mm (Slit) Hz 500Hz 3.6dB 5.1: [db(a)] Barrier Shape Rolling Noise Aerodynamic Noise Bow Collector Noise Plane H=2m Plane H=5m with Slit with 5Tubes
11 m 5m 250Hz 2000Hz
12 104 5 Bow Collector Noise Aerodynamic Noise 5,174 3,550 3,674 1,090 3,380 2,370 Rolling Noise 1,000 8,000 2,690 25,000 Receiver 5.8: A-Weighted Sound Pressure Level [db] Plane Barrier H=2m Plane Barrier H=5m H=5m Slit barrier H=5m with 5 Tubes frequency [Hz] 5.9:
13 A-Weighted Sound Pressure Level [db] Plane Barrier H=2m Plane Barrier H=5m H=5m Slit barrier H=5m with 5 Tubes frequency [Hz] 5.10: 85 A-Weighted Sound Pressure Level [db] Plane Barrier H=2m Plane Barrier H=5m H=5m Slit barrier H=5m with 5 Tubes frequency [Hz] 5.11:
14 / mm 32kg/m 3 48kg/m kHz Dim Anechoic Chamber 1,340 1, ,200 Barrier Train 500 Source Receiver 5.12: 48kHz M
15 Hz 27.9dB 26.9dB 125Hz 3
16 Plane Barrier with 5Tubes 30 Insertion Loss [db] frequency [Hz] 5.13: Plane Barrier with 5Tubes Insertion Loss [db] frequency [Hz] 5.14:
17 transformer Short circuit Barrier transformer 5.15: Hz 1.5m 1 L eq 1/ FFT 1Hz
18 transformer noise 60 A-weighted sound pressure level [db] frequency [Hz] 5.16: Hz FFT 60Hz 2 120Hz 240Hz 360Hz FFT 120Hz 240Hz 360Hz / /6
19 transformer noise (FFT) 50 Relative SPL [db] frequency [Hz] 5.17: FFT 1/4 1/6 CD-type 2 CD-type 120Hz CD-type Hz 1/4 90 1/4 [15] CD-type 1:3 120Hz (4.6) 1 1/54 500mm
20 , ,003 Source 708 Source 500 Composition of straight sound tubes Composition of the tubes containing CD-type 5.18: m 15m 5m 5.20 CD-type 360Hz Hz 46.5dB 45.4dB CD-type 45.1dB
21 Barrier Height = 5m GL Source Receiver 2.5m 15m 5.19: Insertion Loss [db] composition of straight sound tubes containing CD-type Plane Barrier frequency [Hz] 5.20:
22 114 5
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