Division 4.3.2.5 Determination of the equation of motion
F1Symbols 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 |
| F2me | 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 |
- 4.3.2.5.1General form
- 4.3.2.5.2Mechanical drag modelling
- 4.3.2.5.3Aerodynamic drag modelling
- 4.3.2.5.4Final equation of motion
Annotations
Textual amendments
- F1
- F2