Automotive Vehicle Mechanics and Its Modeling ME5670
Instructor: Ashok Kumar Pandey Email:
[email protected]
Class timing Tuesday: 2:30 – 4:00 4:00 PM Friday: 4:00 – 5:30 5:30 PM
Date: 03/01/2014
Fundamental Definitions Vehicle Dynamics
It concerns with the movements of vehicles on a road surface
Physical condition
Acceleration and braking, ride, and turning
Dynamic behavior
Forces on the vehicle due to tires, gravity, and aerodynamics. Vehicle and its components are studied to determine forces produced by the sources at particular maneuver and trim condition
Objective
How the vehicle responds to these forces. Representation
One mass approximation Located at its C.G. For acceleration, braking, and most turning analysis.
Two masses approximation
For ride analysis, wheels are treated as separate lumped masses Body mass as sprung mass.
Vehicle Dynamics Interaction Vehicle dynamics Isolation
It implies the rejection of disturbance
Separating driver from the disturbances Internally generated disturbance
Control
Engine vibration and noise
Externally generated disturbance
Aerodynamic interaction (crosswinds, wakes, etc)
Absence of disturbance amplification
Path
Speed
Stability Agility Fidelity
Road undulation
Linearity
Vertical Forces/effects
Longitudinal Lateral
Refinement
Ride
Subjective
Handling
Objective
Performance
Course Content •
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Vehicle Mechanics – Forces under static and dynamic equilibrium. Free body diagram of different vehicle components such as tire, braking, suspension, chassis, car body, gear box, clutch system, power steering, chassis, car body. Simple linearized rigid models of different components. Dynamic stability and the vehicle performance under different operating conditions such as - understeering, neutralsteering, oversteering, and - factors associated with the vehicle-terrain interaction.
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Concept of vehicle ride comfort.
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Introduction to random excitation and electronics stability controls.
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Performance characteristics of a comfort vehicle ride.
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Introduction to the development of one-dimensional vehicle driveline using different softwares such as MATLAB Simulink/MAPLESIM/ADAMS. Introduction to advanced topics in the accurate modelling of vehicle dynamics –
Grading Scheme
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Attendence: 10%
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Assignments: 40%
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Mid Term: 30%
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Project report: 20%
References 1. Thomas Gillespie, “Fundamentals of Vehicle Dynamics”, SAE, 1992. 2. Dean Karnopp, “Vehicle Dynamics, Stability, and Control”, Second Edition, CRC Press, 2013. 3. Giancarlo Genta , “Motor Vehicle Dynamics -Modeling and Simulation”, World Scientific, 2013 4. John C. Dixon, “Tires, Suspension and Handling”, SAE, 1996. Herb Adams, “Chassis Engineering: Chassis Design, Building & Tuning for High Performance Handling, Brownian Dynamics”, HP Trade, 1992
Softwares: ADAMS, SYSTEM MODELER/MAPLESIM, MATLAB SIMULINK, SOLID EDGE/UNIGRAPHICS,
