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Practical Exercises
- CarMaker Exercises after Lecture 3 (Questions)
- Steady State Circular Driving
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Geöffnet: Sonntag, 21. Februar 2021, 01:00Fällig: Mittwoch, 3. März 2021, 01:00Please conduct a steady state circular driving test according the ISO 4138 with a related test conditions.1. Analyse the ISO 4138 test condictionse.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!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. -
Geöffnet: Sonntag, 21. Februar 2021, 01:00Fällig: Mittwoch, 3. März 2021, 01:00
1. Conduct a slowly increase steer test up to the physical limit with following test conditions:
- V = 100 kph
- Steering Angle Speed max: 13,5°/s
2. Analyse following KPI's- Steer Wheel Angele-SWA at 3 m/s²
- SWA at 4 m/s²
- ay max
- Roll Angle max
- Yaw Rate max
- SWT - Steer Wheel Torque
- ay at SWT max
- Yaw Gain max
3. Create a result report