SuperFlow AutoDyn, Руководство оператора, Страница: 146 / 208

AutoDyn
Operators Manual
Section 9 - Page 26
CH9 AutoDyn Description of the Config File.fm
Channel 117 - DJWhTq lb-ft = C114*5252.113/C125
nm = C114*9549/C125
Channel 117 derives a corrected torque value in lb-ft [nm] from the dyno
comparison corrected wheel power calculated at the rear wheel in
channel 114, using Engine Speed from channel 125. This channel is an
estimate only, used for comparisons with another dyno, and should not be
used for marketing or development purposes.
Channel 118 - Vap P C74T137*C120/100
Channel 118 is to calculate the vapor pressure of the water in the air
under the test conditions. The percent humidity calculated in Channel 120
is combined with the 100% humidity data generated by Channel 74, the
air temperature, and T137, the Interpolation Table Channel. T137
contains the vapor pressure for 100% relative humidity at each
temperature. Then Channel 120, the percent relative humidity, is
multiplied times that number to obtain the actual vapor pressure. The
vapor pressure is then subtracted from the barometric pressure to
determine the net barometric pressure to be used in the power correction
factors in Channels 101 and 102. Vapor pressure is the true measure of
water vapor content of the air. Relative humidity cannot be used directly
because it varies with air temperature.
Channel 119 - AirDen lb/ft
3
= 0.0763*C76/29.92*520/(460+C74)
g/l = 1.293*C76/101.3*273/(273+C74)
Channel 119 is used to calculate the air density under the test conditions.
Air density is measured in pounds per cubic feet
[grams per liter] of air.
The constant 0.0763 is the lbs/cubic foot of air at sea level (1.293 g/l at
sea level). Channel 119 uses the barometric pressure from Channel 76
and the air temperature from Channel 74 to calculate the actual air
density under test conditions.
Channel 120 - Humidy (C6-0.655)/2.54*100)/(1.093-(0.0012*C74)
((C6-0.655)*39.37)/(1.093-(0.00216*C74+0.0384))
Channel 120 takes the humidity sensor voltage input from Channel 6, and
combines it with the air temperature to determine the percent relative
humidity of the air during the test. This data is then used by Channel 118
to determine the vapor pressure in the air for power correction.
Channel 121 - WhlTrq lb-ft = C100*5252.113/C125
nm = C100*9549/C125
Channel 121 derives an uncorrected torque value in lb-ft [nm] from the
Wheel Power measured at the rear wheel in channel 100, using Engine
Speed from channel 125. Although this is not the actual torque applied to
the ground, it is a common value used in marketing and advertising to
represent torque of the vehicle under test.
Channel 122 - Accel C220/21.937
Channel 122 calculates the actual acceleration or deceleration of the test
vehicle in G's. It uses Channel 220, which calculates the acceleration in
miles per hour per second, and converts it to G's by dividing by 21.937.
One G is equal to an acceleration rate of 21.937 miles per hour per
second
[9,807 meters per second per second] .