# Commission Regulation (EU) 2017/1151 of 1 June 2017 supplementing Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) No 1230/2012 and repealing Commission Regulation (EC) No 692/2008 (Text with EEA relevance), Division 4.3.2.5: Determination of the equation of motion


Symbols used in the on-board anemometer equations of motion are listed in Table A4/5.
Table A4/5
Symbols used in the on-board anemometer equations of motion
Symbol
Units
Description
Af
m2
frontal area of the vehicle
a0 … an
degrees-1
Aerodynamic drag coefficients as a function of yaw angle
Am
N
mechanical drag coefficient
Bm
N/(km/h)
mechanical drag coefficient
Cm
N/(km/h)2
mechanical drag coefficient
CD(Y)
aerodynamic drag coefficient at yaw angle Y
D
N
drag
Daero
N
aerodynamic drag
Df
N
front axle drag (including driveline)
Dgrav
N
gravitational drag
Dmech
N
mechanical drag
Dr
N
rear axle drag (including driveline)
Dtyre
N
tyre rolling resistance
(dh/ds)
—
sine of the slope of the track in the direction of travel (+ indicates ascending)
(dv/dt)
m/s2
acceleration
g
m/s2
gravitational constant
mav
kg
arithmetic average mass of the test vehicle before and after road load determination
me
kg
effective vehicle inertia including rotating components
ρ
kg/m3
air density
t
s
time
T
K
Temperature
v
km/h
vehicle speed
vr
km/h
relative wind speed
Y
degrees
yaw angle of apparent wind relative to direction of vehicle travel

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/4/division/division/4./division/4.3./division/4.3.2./division/4.3.2.5. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-4./division-4.3./division-4.3.2./division-4.3.2.5.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.