Appendices to NCHRP Research Report 842 (2017) / Chapter Skim
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From page 158... ...
I1 APPENDIX I LIGHT VEHICLES AND BUSES SUMMARY TABLE OF CONTENTS LIGHT VEHICLE RESULTS ................................................................................................... I2 Northern California Sites ..................................................................................................
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I2 LIGHT VEHICLE RESULTS Light vehicle data were taken at three sites in Northern California (505 SB1, 505 SB2, and 505 NB1) and at nine sites in North Carolina (NC1, NC3, NC6, NC7, NC8, NC9, NC10, NC11, and NC12)
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From page 160... ...
front tire the front tire noise Further, t relatively it cannot combinat Contours expected horizonta higher le contribut beyond t effect of Of the 13 from the noise at bands th louder th vehicle p Figure I1 normaliz s. Another p of the vehic may have he car is tra high, espec be determin ion of them for a typica , the contou l direction, vels tended ions from b he rear of th determining light-duty maximum p a height of at impacted an the quiet rofiles at 50 : Overall A ed to 94.1 dB lausible ex le.
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Figure I2: Overall, 800, and 1,250 Hz con I4 tours of passenger car pass-by Run 56 at 505 SB1
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Figure North Ca Uphill S Figure I4 vehicle ru the groun North Ca of domin Each ligh dBA at h I3: Overall, rolina Test ites. The av by red, blu ns show le d.
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jump in s than thes to the he light veh at NC11 contours noise lev shown in up trucks Figure I4 North Ca Downhil Figure I5 sites typi light veh typical li the down between these ligh ource heigh e special ca avy and me icle runs are indicated s for these sp els in the lo the figures that are hig : Overall A rolina norm l Sites. Pro for Sites N cally reduce icles reduci ght vehicles hill sites an 7 and 8ft (2 t vehicles a ts at two lig ses, all nois dium truck consistentl ome noise a ecial cases, wer freque for these run her than wh -weighted l alized to 84 files for the C7 (red)
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Figure I5 North Ca Level Si shown in there is o vehicle a typical li while at N typical li was a lar SUV, in : Overall A rolina norm tes. Seven Figure I6.
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From page 165... ...
Figure I6 North Ca Slower S collected runs show 2.2m)
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From page 166... ...
Figure I sites in N Test Site Figure I maximum curvature less cons site. For profiles w 7: Overall A orth Carolin Summary 8 shows the profile le s at heights istency than all but one ere within -weighted a normaliz average l vel of 89.5 within 2ft ( the heavy t site in No 5ft (1.5m)
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From page 167... ...
Figure I8 BUS RE A total o NC6, NC and aver levels we level was site was dBA, res Table Test Site 505 SB2 NC6 NC7 NC14 NC16 : Average o SULTS f 11 buses w 7, NC14, an age speed i re measured measured a higher than pectively, an I2: Summa NumbeVehic 1 3 1 4 2 verall A-we ere measure d NC16 in nformation at slower t the uphill the downhil d was highe ry of maxim r of les Ran ighted levels d for this pr North Carol for all mea speed Sites Site NC6. O l site and N r than the s um profile l ge of Maxi Profile Lev -- 94.1-98.5 dB -- 77.7-88.1 dB 85.6-91.1 dB I10 for all ligh oject: 1 at 5 ina.
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From page 168... ...
The verti Table I2 level at h for heavy I10. The passed th axle tire attributab be influe there wa However dBA at a low frequ At the slo dBA gre behavior greater th this is a p Figure I9 and Nort cal distribut are shown eights rangi and medium maximum l rough the m s.
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From page 169... ...
Fig Test Site Figure I1 profile le dBA at h ure I10: Ov Summary 1 shows th vel of 90.7 eights rangi erall, 800, a e average b dBA. For a ng from 4.8 nd 2,000 Hz us profiles ll of the bu to 6.9ft (1.4 I12 contours of at each site ses shown i to 2.1m)
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From page 170... ...
Figure I11: Average overall A-weight I13 ed levels for all buses normalized to 90.7 dBA
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