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| MECA0004-1 | Vehicle performance and behaviour
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| Duration : | 30h Th, 30h Pr |
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| Credits/ECTS : |
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| Holder(s) : | Pierre Duysinx |
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| Language : | Langue française |
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| Course contents : | The characteristics of a ground vehicle may be described in terms of its performances, handling, and ride. Performance charactristics refer to its ability to accelerate, decelerrate, to develop drawbar pull, and to overcome obstacles. Handling quantities are concerned with the response of the vehicle to drivers' command and its ability to stabilize its motion against external disturbancies. Ride characteristics are related to the vibration of the vehicle excited by the surface irregularities and its effects on passengers and goods.
The lecture is mainly focussed on road vehicles, but introduction is also given to railway vehicles.
The following points will be adressed:
- Power source characteritics (Internal combustion engines, electric motors) transmissions and drivetrains,
- Road resistance forces: rolling resistance, aerodynamic forces, slope forces,
- Description and modelling of tire-ground and wheel-rail forces,
- Description and calculation of performance criteria (maximum speed, acceleration, elasticity, etc.),
- Fuel consumption and emissions measures, driving cycles, experimental testings,
- Braking performance,
- Tire mechanics,
- Steering geometry (Ackerman theory)
- Steady state handling of a two-axle vehicle: bicycle model, under/oversteer gradient,
- Transient reponse of a two-axle vehicle
- Roll-over,
- Human response to vibrations,
- Road vibration isolation: quater car model, sensitivity to sprung and unsprung masses, suspension damping and stiffness,
- Pitch and bounce modelling: two-dof-model,
- Introduction to crash mechanics and accident mechanics
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| Course objective : | Mastering the fundamental concept when evaluating vehicle characteristics (performance, handling, ride) and their relationships with the design of ground vehicles under various operating conditions. |
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| Prerequisites : | Knowledge in Theoretical Mechanics, Machine Design and Construction, Vibration of Mechanical Systems, Control Systems, Applied Thermodynamics. |
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| Workshops : | Exercices and compûter exercices (MATLAB), laboratory (chassis dynamometer, gear box) |
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| Organization : | The lectures are given on Monday morning at first quadrimester (from September to December). 13 lectures (4 hours) + two laboratories. Exam in January. |
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| Written notes : | Lecture notes
Copy of slides (in French)
Reference books (in English):
- T. Gillespie. AA« Fundamentals of vehicle Dynamics AA», 1992, Society of Automotive Engineers (SAE)
- W. Milliken & D. Milliken. AA« Race Car Vehicle Dynamics AA», 1995, Society of Automotive Engineers (SAE)
- R. Bosch. AA« Automotive Handbook AA». 5th edition. 2002. Society of Automotive Engineers (SAE)
- J.Y. Wong. AA« Theory of Ground Vehicles AA». John Wiley & sons. 1993 (2nd edition) 2001 (3rd edition).
- G. Genta."Motor Vehicle Dynamics. Modeling and Simulation". World Scientific. 1997.
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| Assessment : |
- Oral exam with open books (70 %)
- Laboratory reports (10%)
- Computer work (20%)
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| Contacts : | Pierre Duysinx,
LTAS - Automotive Engineering
Institute of Mechanics and Civil Engineering, Building B52
Chemin des chevreuils, 1, 4000 Liège
Téléphone : +32 4 366 9194,
Fax : +32 4 366 9159,
Email : P.Duysinx@ulg.ac.be |
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| Remarks : | None |
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