Task 1: Steady State Circular Driving
Completion requirements
Opened: Sunday, 17 October 2021, 1:00 AM
Due: Wednesday, 27 October 2021, 1:00 AM
Please conduct a steady state circular driving test according the ISO 4138 with a related test conditions.
1. Analyse the ISO 4138 test condictions
e.g.- Constant Radius: 100 m
- Speed: 0 – max kph
- day: 0,1 m/s²/s
- SWA, ay , Yaw, Radius: steady state condition
2. Aply the test in CarMaker according the ISO 4138 (lecture script reference slice 161-176).
Please note, that the CarMaker sample is not within the ISO specification!
Please note, that the CarMaker sample is not within the ISO specification!
3. Conduct the test and visualize the relevant quantities.
4. Analyse following KPI - Key Performance Indicator:
Ackermann Angle(SWA)
Understeer Gradient
ay,max
Yaw Gain Max (RealttimeExpression Calculation within MiniManeuverCommand --> Qu::YawGain=Car.YawRate/Steer.WhlAng
Roll Stiffness
SWT max
Ay rel at SWT
- Side Slip Max
5. Optimize KPI's:
- Improvement of ay max as much as possible
- Decrease of roll stiffness of >15%
- Reduction of understeer gradient to < 2,5 °/g
- Reduce Ackermann >10 %
7. Create a short report of the results.