Lap Time Simulation Crucial for Racecar Concept Evaluation Fabrice Oehler AMZ Racing, Christoph Hahn MathWorks

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1 Lap Time Simulation Crucial for Racecar Concept Evaluation Fabrice Oehler AMZ Racing, Christoph Hahn MathWorks

2 WR Film

3 Guinness World Record in Formula Student AMZ Racing set a new world record for the fastest km/h acceleration of an electric car in s 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 3

4 Guinness World Record in Formula Student AMZ Racing set a new world record for the fastest km/h acceleration of an electric car in s Greenteam Stuttgart set a new record in summer s 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 4

5 Formula Student

6 About Formula Student Largest engineering competition worldwide Over 500 Teams with members Combustion and electric class Different static and dynamic events Points in a Formula Student Event Engineering Design Business Plan Cost Event Acceleration Skidpad Autocross Endurance Efficiency 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 6

7 AMZ Racing

8 AMZ Racing Builds race cars for Formula Student since 2007 Since 2010 six electric cars were built Since 2013 first place in Formula Student Electric world ranking 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 8

9 Season flüela 4 wheel hub motors 25.7 Nm, 37 kw, 3.25 kg Lithium Polymer accumulator 6.46 kwh Full Aerodynamics-Package Drag Reduction System (DRS) Adaptive Damping System Simulink programmed Vehicle Control Unit 2 nd place in Formula Student Germany, 1 st places in Austria and Spain 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 9

10 Lap Time Simulation

11 Motivation to Use Lap Time Simulation Only eight months for design and manufacturing a race car We need a tool for decision making Different concept decisions can be analyzed Accumulator Capacity Gearbox Transmission Ratio Aerodynamic Sensitivities 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 11

12 Workflow Evaluation Concept idea Simulation 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 12

13 Workflow Car parameters m Simulate Calculate and analyze Event h L Visualize y x Velocity difference 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 13

14 Structure of the Simulation Model Powertrain / Tires Two-track model Control systems Driver 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 14

15 Structure of the Simulation Model Powertrain / Tires Two-track model Control systems Driver 6/3/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 15

16 Software Demonstration 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 16

17

18 Δv [km/h] Results Velocity difference of a 4WD car vs. a 2WD car /10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler

19 Points FSG Results Concept Simulation Acceleration Points Skidpad Points Autocross Points Endurance Points Total WD, no Aero 2WD, Aero 2WD, DRS 4WD, no Aero 4WD, Aero 4WD, DRS 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 19

20 Points FSG Results Energy Simulations 4WD with DRS Acceleration Points Skidpad Points Autocross Points Endurance Points Total ,5 5,7 5,7 5,9 5,9 6,1 6,1 6,3 6,3 6,5 6,5 6,7 6,7 6,9 6,9 7,1 7,1 Battery Capacity [kwh] 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 20

21 Validation Different tests were made to validate our results: Weight sensitivity validation Laptime deviation Lapsim On-track test Delta + 1 kg % % 6 % + 10 kg % % 8 % 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 21

22 Validation Different tests were made to validate our results: Weight sensitivity validation Aerodynamics sensitivity validation Laptime deviation Aero vs. no Aero Lapsim On-track test Delta 3.82 % 3.97 % 4 % 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 22

23 Conclusions By using Lap Time Simulation we get a decision-making basis for different concepts Aerodynamic setups Amount of accumulator capacity Transmission ratio Models are simplifications, but they are very helpful. Currently implementing suspension system. 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 23

24 MathWorks Support for Formula Student Complimentary Software MATLAB and Simulink Racing Lounge Online Training for Physical Modeling 5/10/2016 Akademischer Motorsportverein Zürich Fabrice Oehler 24

25

26 Thanks for Your Attention

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