Modeling noise levels due to traffic patterns ("Hornsby, Benjamin Wade Young" )

```Subject: Modeling noise levels due to traffic patterns
From:    "Hornsby, Benjamin Wade Young"  <ben.hornsby@xxxxxxxx>
Date:    Mon, 26 Mar 2012 15:57:26 -0500
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

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Hi All,
The following is a query from a colleague (Wes Grantham) I am working with =
on this project. Any suggestions to get us going in the right direction are=
greatly appreciated.

Thanks much,

Ben

******
We are attempting to simulate or model the noise from multiple vehicles (sa=
y passing by a position on the street). This is in conjunction with our wor=
k with on how traffic noise contributes to overall noise pollution in vario=
us street situations (from busy intersections to residential neighborhoods)=
.

We are starting by simply adding the intensities of single vehicles as they=
arrive at the measurement point, taking into account their distances and m=
aking an assumption about the attenuation per doubling of distance (a maxim=
um of 6 dB would correspond to an anechoic background; presumably a normal =
street scene with reflecting objects would have a smaller attenuation per d=
oubling of distance). We have thought about modeling the effects of a singl=
e building, and how the reflections from that building would affect the ove=
rall sound level. Also, we intend to model the occurrence of individual veh=
icles (perhaps using a poisson process?), and build into the model such par=
ameters as number of lanes, average velocity of the vehicles, distance of t=
he measurement point from the street, and average traffic density).

Does anyone have any references for work that have done this type of modeli=
ng? We have not ventured into this area before and want to make sure we're =
on the right track before going too far.

Thank you.

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nk=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal>Hi All,<o:p></o:=
p></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Ari=
al","sans-serif"'>The following is a query from a colleague (Wes Grantham) =
I am working with on this project. Any suggestions to get us going in the r=
ight direction are greatly appreciated.<o:p></o:p></span></p><p class=3DMso=
Normal><span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><o=
:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:10.=
0pt;font-family:"Arial","sans-serif"'>Thanks much,<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","sans=
-serif"'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'fo=
nt-size:10.0pt;font-family:"Arial","sans-serif"'>Ben<o:p></o:p></span></p><=
p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","sa=
ns-serif"'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'=
font-size:10.0pt;font-family:"Arial","sans-serif"'>****** <o:p></o:p></span=
></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Aria=
l","sans-serif"'>We are attempting to simulate or model the noise from mult=
iple vehicles (say passing by a position on the street). This is in conjunc=
tion with our work with&nbsp;on how traffic noise contributes to overall no=
ise pollution in various&nbsp;street situations (from busy intersections to=
residential neighborhoods).</span><o:p></o:p></p><p class=3DMsoNormal>&nbs=
p;<o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-=
family:"Arial","sans-serif"'>We are starting by simply adding the intensiti=
es of single vehicles as they arrive at the measurement point, taking into =
account their distances and making an assumption about the attenuation per =
doubling of distance (a maximum of 6 dB would correspond to an anechoic bac=
kground; presumably a normal street scene with reflecting objects would hav=
e&nbsp;a smaller attenuation per doubling of distance). We have thought abo=
ut modeling the effects of a single building, and how the reflections from =
that building would affect the overall sound level. Also, we intend to mode=
l the occurrence of individual vehicles (perhaps using a poisson process?),=
and build into&nbsp;the model&nbsp;such parameters as number of lanes, ave=
rage velocity of the vehicles, distance of the measurement point from the s=
treet, and average traffic density).</span><o:p></o:p></p><p class=3DMsoNor=
mal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal><span style=3D'font-size:10.0=
pt;font-family:"Arial","sans-serif"'>Does anyone have any references for wo=
rk that have done this type of modeling? We have not ventured into this are=
a before and want to make sure we're on the right track before going too fa=
r.</span><o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=
=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","sans-seri=
f"'>Thank you.</span><o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p><=
/p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></body></html>=

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Electrical Engineering Dept., Columbia University