MAHA POWERDYNO MSR Series User Manual

37
BA053101-en
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2.10
Calculation Basis
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2.10.1
Road Load
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Equation
m a
v
3,6
P
v
v
3,6
P
v
v
3,6
P
F
ref
Roll
2
ref
Flex
3
ref
2
Air
x
⋅+
⋅
+
⋅
⋅
+
⋅⋅
=
with
• v
ref
Reference speed for resistance performance values - normally 90 km/h.
• v Driving speed
• P
air
Air resistance performance [kW]
• P
flex
Flex performance [kW]
• P
Roll
Roll resistance performance [kW]
• a.m Vehicle mass
Air resistance power P-Air [kW]
The air resistance power is proportional to the surface of
the vehicle front and air resistance coefficient c
w
.
v ) v (v A c 0,5 P
2
0FrontWAir
⋅+⋅⋅⋅⋅=
r
with e.g.
• Air density r (rho)
= 1.1 kg/m
3
• air resistance coefficient
c
W
= 0.38
• Front surface
(VEH-width x Height)
A
Front
= 1.7 m · 1.47m = 2.5 m
2
• Driving speed
v = 90 km/h = 25 m/s
• Head wind speed
v
0
= 0 m/s
results:
• P
air
= 0,5 · 1,1 · 0,38 · 2,5 · 25
2
· 25
= 8.164 kW at 90 km/h
Flex power P-Flex [kW]
Flex power or resistance is defined as the power loss
which occurs due to the flexing of the tire on the road
surface and/or roller.
v g m P
wFlex
⋅⋅⋅=
m
Generally speaking the flex power does not have a relevant influence on the test results due to the
minimal flex resistance coefficient.

MAHA POWERDYNO MSR Series Specifications

General

Brand	MAHA
Model	POWERDYNO MSR Series
Category	Measuring Instruments
Language	English