2014-01-14 Master Thesis Individual Presentation Clement CHATREAUX Content

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INDIVIDUAL PRESENTATION

CHATREAUX Clément 14/01/14

Development of a Bicycle Simulation Model to Study the

Evolution of the Roll Center Ride Height and the Slip Angle

in a Steady State Cornering Condition, on a Formula 4

Single-seater Race Car

PLAN

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Slide 1: Title Slide 2: Plan Slide 3: Presentation of the Company Slide 4: Presentation of the Car Slide 5: Presentation of the Work at Company – Data

Analysis Software Used Slide 6: Presentation of the Work at Company – F4 Excel Slide 7 Presentation of the Work at Company – Simulation

with Matlab-Simulink Slide 8: Vertical Model Slide 9: Lateral Model Slide 10: Future Work Slide 11: Axes of Improvement

Clément CHATREAUX – Individual Presentation 14/01/2014

SWITZERLAND

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Languages:


Lyss

COMPANY LOCATION& HISTORY

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Location:- Lyss – Canton of

Bern.- Esslingen – Lyss:

320 – 380 kms.

History: - Swiss Auto racing

team for single-seater cars.

- Created in 1993 by Andreas Jenzer (Former Formula Ford 1600 Driver).


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Series Raced: - Formula Ford 1800 – Swiss Championship: 1993-2000

International Championships: 1995-2000- Formula Renault 2.0 – Swiss Championships: 2007-2010

International Championships: 2000-2013

- Formula Abarth (F4 Italy) : 2010-2014- Formula Renault V6 : 2003 – 2004- Formula Renault 3.5: 2005-2006 - International Formula Master: 2007-2009- GP3 Series: 2010-2014

Series to be raced in 2015: - Italian & German F4 / GP3 Series


COMPANY HISTORY

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Formula Abarth (F4 Italy & Germany):International drivers between 15 & 18 years old (2014 regulation)


THE F4 CAR

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- Wheel base: 2.75 m- Length/Width/Height: 4.35/1.75/0.95 m- Minimum Legal Weight with Driver: 555 kg- Max Speed: 230 km/h- Max RPM: 6400 rpm- Total Price: 47 500 euros


F4 TECH SPECS General Information:

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- Tatuus Monocoque Carbon- Front & Rear Carbon

Crashboxes- Carbon Bodywork


F4 TECH SPECS Chassis & Bodywork:

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- 1.4 L Fiat Abarth Turbocharged Engine with ECU

- Max Power/Torque: 160 HP/235 N.m


F4 TECH SPECS Engine:

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- Double Wishbone with Pushrods- Double Springs/Shock Absorbers- Bump & Rebound Adjustable- Toe & Camber Adjustable


F4 TECH SPECS Front Suspensions:

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- Same as Front- + Roll Center & Anti-Squat

Adjustable


F4 TECH SPECS Rear Suspensions:

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- Sequential 6 speeds Gearbox with Paddleshift

- 13” Aluminum Rims with Centre Bolt


F4 TECH SPECS Transmission & Wheels:

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Location: Montmeló, Catalonia, Spain Track Length: 4,665 km Corner 4 to Simulate:- Entry Speed: 202 km/h- Entry Gear: 5 th- Entry RPM: 6000 rpm- Apex Speed: 125 km/h- Apex Gear: 4 th- Apex RPM: 4500 rpm

- To brake and take an early apex before carryinglots of speed out of the exit Clément CHATREAUX – Individual Presentation 14/01/2014

BARCELONA CIRCUIT

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Video System: Smarty Cam GP HD

Full Track Best Lap: 1´48´´037 4th Corner: 0´30 – 0´44


VIDEO

Video Barcelona

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Data Logger: AIM Evo 4

Car Available Channels: - Gear (1 sensor) - Steering angle (1 sensor) - Lap timer/trigger (1 sensor)- Acceleration (1 tri axial sensor)- Wheels speeds front (2 sensors)- Brake pressure front/rear (2 sensors)- Throttle pedal or valve (1 sensor)

Analysis Software: Race Studio 2 Analysis v2.54.02- To download & process data from AIM data loggers. - To see how your vehicle, engine and driver perform.

(Plot vs. Time or Distance, XY Plot, Track Map Tool, Histograms Graphs, Split Time or Distance Report, Engine Analysis, etc…)Clément CHATREAUX – Individual Presentation 14/01/2014

CAR DATA

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Analysis Exemple with Race Studio Analysis: - Cursor on Barcelona Corner 4.- Obtaining data for the Driver Model to simulate.


DATA ANALYSIS

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Excel File for F4 Setup: Comparison of 2 Set Up- Obtaining Different Values for Geometric Motion, Aero &

Tires, ….


SET UP EXCEL

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Optimum Kinematics Software: - Formula Ford 1800 – Swiss Championship: 1993-2000

International Championships: 1995-2000- Formula Renault 2.0 – Swiss Championships: 2007-2010

International Championships: 2000-2013

- Formula Abarth (F4 Italy) : 2010-2014- Formula Renault V6 : 2003 – 2004- Formula Renault 3.5: 2005-2006 - International Formula Master: 2007-2009- GP3 Series: 2010-2014

Series to be raced in 2015: - Italian & German F4 / GP3 Series


OPTIMUM K MODEL

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Tires =only components on car that constructors/teams:

- Do not make- Cannot really alter them- Have very little control on how they are made


MOTIVATION

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Roll Center (RC) Height:- Centrifugal force => push car outside corner=> car rolls

outside corner.- Roll axis closer to CoG => less chassis roll corner- One of the most powerful car adjustment => immediate

effect on a car’s handling. Whereas ARB, shocks and springs: car rolling before effect


MOTIVATION

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Choice of Models: - Modelling=simplified abstract view of complex reality.- Choice of Models with evolving complexity.

=> Can be tested, validated & Optimized as design process goes along.


SIMULATION

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Matlab/Simulink Software: Half Car Lateral Model


Work - Simulation

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Tires =only components on car that constructors/teams:

MF (Magic Formula) tyre model (empirically based)

The MF-tyre model also known as “Pacejka’s magic formula” has now become the accepted racing industries standard model. It is in constant development and several different versions exist.

Disadvantages (MF-tyre model):

• The curves are based on mathematical coefficients (no direct tyre related basis) • The coefficients are difficult to obtain from the tyre manufactures


MOTIVATION

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Matlab/Simulink Software: Quarter Car Vertical Model


Work - Simulation

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Matlab/Simulink Software: Half Car Vertical Model


Work - Simulation

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Matlab/Simulink Software: Half Car Lateral Model


Work - Simulation

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Thank you for your attention!

19/02/2014 Clément CHATREAUX – Individual Presentation

2014-01-14 Master Thesis Individual Presentation Clement CHATREAUX Content

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