SuperFlow AutoDyn, Руководство оператора

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Description of the Configuration File
Volume 2, Rev 2 6/28/04
Section 9 - Page 23
Channel 105 - DynLos
2WD and
AD-11
Systems
HP = ((C10T132)*C119/0.0763)
kW = ((C10T132)*C119/1.293)*0.746
Channel 105 is used to calculate the parasitic losses inherent in the
dynamometer due to aerodynamic drag. This channel uses the roll speed,
and then refers to interpolation table 132. These losses are measured at
the SuperFlow factory by motoring the dynamometer at all speeds up to
200 miles per hour
[320 km/h] and recording the loss information.
Channel C119 adjusts the absorber and roll aerodynamic losses for air
density. The value 0.0763 is a constant relating to standard air density.
Channel 105 is combined with channels 126 and 108 in channel 100 to
calculate wheel power. It is also used in channel 127 to calculate
coastdown losses and in channel 129 for use in the Roadload and Aero
simulations.
AWD systems (C40*C88)+(C44*C89)
For AWD systems, the front roll loss (C40) is added to the rear roll loss
(C44) to produce total dyno losses. Channels 88 and 89 are used as
switches for selecting the wheel power measurement mode on the AWD
system. This value is combined with channels 108 and 126 in channel
100 to calculate wheel power.
Channel 106 - TirLos
2WD and
AD-11
Systems
HP = (C77/2)*0.010*C10/375
kW = (C77/2)*0.010*9.81*C10/3600
AWD Systems
HP = ((C77/2)*0.010*C10/375)*(((C88*C89)-1)abs)
kW = ((C77/2)*0.010*9.81*C10/3600)*(((C88*C89)-1)abs)
Channel 106 is used to calculate the estimated rolling power losses of the
non-driven tire. Rolling losses are a function of the weight on the tire and
the tire loss coefficient of 0.010. Channel 106 is then used by Channel
129 to calculate the required absorber torque to apply during the Road
Load simulation tests. The additional portion of the calculation,
((C88*C89)-1)abs), is used on the AWD systems to turn off the
calculation when both front and rear wheels are used on the rollsets. In
that case, since both front and rear wheels are being driven on the
rollsets, their inherent losses will already be present to the system and
there is no need to estimate tire loss.
Channel 107 - AirDrg hp = 1.055*C78*(C10^3)*C119/10000
kw = (1.29)*(C10^3)*C119*C78/100000
Channel 107 is used to calculate the air drag power for the vehicle. This
channel uses Channel 78 for vehicle frontal area times the coefficient of
drag, and Channel 119 for air density. These are all multiplied by the cube
of the vehicle speed, Channel 10, to determine the air drag power at any
speed during a test. These figures are used by Channel 129 to determine
the correct road load power for Road Load test simulations.