Roadside Measurement of Truck Noise Source Distributions. Paul Donavan Bruce Rymer
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1 Roadside Measurement of Truck Noise Source Distributions Paul Donavan Bruce Rymer ADC40 Summer Meeting San Luis Obispo, CA July 22-25, 2007
2 Beam Forming Applied to Trucks Test Track Environment
3 50 mph Cruise 5900 Truck db Frequency, Hz
4 5900 Truck 50 mph Cruise 416 Hz ~6ft 10 8 ~4-5.2 m say 4.6m Frequency, Hz Tire Tread Passing Frequency Engine Noise from Underneath Cab
5 5900 Truck 50 mph Cruise 884 Hz Engine Noise from Underneath Cab (note lower level compared to next slide) (103)Spectral Density re 20 mupa in 1 Hz Band at Time of Max OASPL ~6ft ~4-5.2 m say 4.6m frequency Frequency, Hz Engine Noise from wheel well Reflection of Engine Noise
6 5900 Truck 50 mph Cruise 960 Hz 1 st Harmonic of tread passage frequency for G167 drive axle tire ~6ft 10 7 ~4-5.2 m say 4.6m Frequency, Hz
7 Beam Forming Applied to Trucks Roadside Environment
8 Test Site Layout 44 ft ( mph) 12 ft Photo Cells V~ mph Radar Gun w/operator (spotter) 50 ft 25 ft Mic 1 4 ft Array 25 ft Still Camera w/operator Array Operator Microphone Operator Mic 2 Video Camera unattended
9 Veolia Test Site dba
10 Papas Taverna Site dba
11 Rockin H Ranch Site 99.1 dba
12 Measurements Controlled passbys & OBSI Conventional statistcal passbys at 25 & 50 ft Beam-forming of passby heavy trucks 56 at Veolia site 59 at Papas site 95 at Rockin H site + Some medium trucks & cars at each
13 OBSI & 25 ft Controlled Passby Papas 25 ft Veolia 25 ft Rockin H 25 ft Papas OBSI Veolia OBSI Rockin H OBSI Noise Level, dba /3 Octave Band Center Frequncy, Hz
14 Overall OBSI & Passby Levels Veolia Papas Rockin H Noise Level, dba OBSI PBY 25 ft PBY 50 ft
15 Rockin H Site Heavy Trucks at 25ft 96 Sound Pressure Level, dba Measured Curve Fit (Only) Speed, mph
16 Heavy Truck Curve Fits 25 ft Sound Pressure Level, dba Rockin H Papas Veolia Speed, mph
17 Truck REMELs at 50 ft Sound Pressure Level, dba REMELS Data Base Rockin H Veolia Papas Speed, mph
18 OBSI, Passby Levels & Truck Levels Veolia Papas Rockin H Noise Level, dba OBSI PBY 25 ft PBY 50 ft Truck Curve Fit at 25 ft Truck "REMELS"
19 Loudspeaker Spatial Calibration 3 ft Loudspeaker
20 Speaker at 1000 Hz 4m C/L 3m 2m 1m 0m -7m -1m +7m Apparent Ground Plane
21 Apparent Ground Plane Speaker at 2500 Hz
22 Apparent Ground Plane Speaker at 500 Hz
23 Apparent Ground Plane Speaker at 315 Hz
24 Passby Array Processing Determined time of maximum A-weighted passby Centered analysis at 0.1 to +0.1 second about time of maximum Analysis window of 0.2 seconds or about 16ft (5m) of movement at 55 mph
25 Passenger Car 400 Hz 63
26 Passenger Car 400 Hz 63
27 Passenger Car 800 Hz 70
28 Passenger Car 800 Hz 70
29 Passenger Car 2000 Hz 56
30 Passenger Car 2000 Hz 56
31 Truck at Veolia Site 400 Hz 72
32 Truck at Veolia Site 400 Hz 72
33 Truck at Veolia Site 800 Hz 72
34 Truck at Veolia Site 800 Hz 72
35 Truck at Veolia Site 1600 Hz 64
36 Truck at Veolia Site 1600 Hz 64
37 Truck at Veolia Site 400 Hz 80
38 Truck at Veolia Site 400 Hz 80
39 Truck at Veolia Site 800 Hz 72
40 Truck at Veolia Site 800 Hz 72
41 Truck at Veolia Site 1600 Hz 61
42 Truck at Veolia Site 1600 Hz 61
43 Truck at Veolia Site 400 Hz 65
44 Truck at Veolia Site 400 Hz 65
45 Truck at Veolia Site 500 Hz 77
46 Truck at Veolia Site 500 Hz 77
47 Truck at Veolia Site 1600 Hz 64
48 Truck at Veolia Site 1600 Hz 64
49 Truck at Veolia Site 2500 Hz 71
50 Truck at Veolia Site 2500 Hz 71
51 Drive axle tire noise appears to dominate Engine noise at high frequency Next steps Analyze in more detail interesting cases higher up source regions Develop method for quantifying source vertical distributions Summary Reviewed over 45 passbys to date Almost universally show loudest sources at the ground or within 1m
52 Veolia Site Heavy Trucks at 25ft 96 Sound Pressure Level, dba Measured Curve Fit (Only) Speed, mph
53 Papas Site Heavy Trucks at 25ft 96 Sound Pressure Level, dba Measured Curve Fit (Only) Speed, mph
54 Brown Lane Veolia Brazil Oldest AC dba Potential Test Sites Lakeville Hwy Rt 116 Field Gate Papa s Older AC dba Lakeville Rd 6220 Lakeville New AC 99.1 dba Rockin H Pegasus Newer AC Vineyard
55 OBSI & 50 ft Controlled Passby Papas 50 ft Veolia 50 ft Rockin H 50 ft Papas OBSI Veolia OBSI Rockin H OBSI Noise Level, dba /3 Octave Band Center Frequncy, Hz
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