CMR336 Vehicle Dynamics and Controls Syllabus:
CMR336 Vehicle Dynamics and Controls Syllabus – Anna University Regulation 2021
COURSE OBJECTIVES:
1. To Develop physical and mathematical models to predict the dynamic response of vehicles
2. To Apply vehicle design performance criteria and how to use the criteria to evaluate vehicle dynamic response
3. To Use dynamic analyses in the design of vehicles.
4. To understand the principle behind the lateral dynamics.
5. To Evaluate the longitudinal dynamics and control in an automobile
UNIT – I INTRODUCTION
History of road and off road vehicle system dynamics – dynamics of the motor vehicle, coordinate systems- vehicle fixed coordinates system, , details of vehicle systems, wheel angles, typical data of vehicles. Fundamental approaches to vehicle dynamics modeling lumped mass, vehicle fixed coordinate system, motion variables, earth fixed coordinate system, Definitions- modeling and simulation of dynamic behavior of vehicle., motion analysis, force analysis, and energy analysis.
UNIT – II LONGITUDINAL DYNAMICS
Introduction to longitudinal dynamics – Performance of road vehicles: forces and moments on vehicle, equation of motion, tire forces, rolling resistance, weight distribution, tractive effort/tractive resistance and power available from the engine/ power required for propulsion, road performance curves- acceleration, grade ability, drawbar pull and the problems related to these terms. Calculation of maximum acceleration braking torque, braking force, brake proportioning, braking efficiency, stopping distance, load distribution (three wheeled and four wheeled vehicles), calculation of acceleration, tractive effort and reactions for different drives, Stability of a vehicle on slope, (Problems related to these). Steer-By-Wire Systems
UNIT – III LATERAL DYNAMICS
Introduction to lateral dynamics – Steering geometry, types of steering systems, fundamental condition for true rolling, development of lateral forces. slip angle, cornering force, cornering stiffness, pneumatic trail, self-aligning torque, power consumed by tire, tire stiffness, hysteresis effect in tires, steady state handling characteristics. yaw velocity, lateral acceleration, curvature response & directional stability. Stability of a vehicle on a curved track and a banked road. Gyroscopic effects, weight transfer during acceleration, cornering and braking, stability of a rigid vehicle and equations of motion of a rigid vehicle, cross wind handling, the problems related to these terms.
UNIT – IV VERTICAL DYNAMICS
Introduction to vertical dynamics – Human response to vibrations, classification of vibration, specification and vibration , sources of vibration, suspension systems, Modal Analysis, One DOF, two DOF, free and forced vibration, damped vibration, magnification and transmissibility, vibration absorber, functions of suspension system. body vibrations: bouncing and pitching. Doubly conjugate points (only basic idea). body rolling. roll center and roll axis, roll axis and the vehicle under the action of side forces, stability against body rolling. Vehicle dynamics and suspension design for stability, choice of suspension spring rate, chassis springs and theory of chassis springs, gas & hydraulic dampers and choice of damper, damper characteristics, mechanics of an independent suspension system. Design and analysis of passive, semi-active and active suspension using quarter car, half car and full car mode- Hydraulic Actuators for Active Suspensions
UNIT – V VEHICLE AERODYNAMIC AND DYNAMIC CONTROL SYSTEM
Road Loads: Air resistance-Mechanics of air flow around a vehicle, pressure distribution on a vehicle, factors affecting rolling resistance, aerodynamic forces – aerodynamic drag, drag components, dynamic Control, modelling of actuators, sensors for automobile control, sensors for detecting vehicle environment, central tyre inflation system. Prediction of vehicle performance. ABS, stability control, traction control. Dynamic Model for Simulation of a Parallel Gas-Electric Hybrid Vehicle Dynamic Model for Simulation of a Power-Split Hybrid Vehicle Background on Control Design Techniques for Energy Management – steer by wire controller Design
TOTAL: 45 PERIODS
COURSE OUTCOMES
Upon successful completion of the course, students should be able to:
CO 1: Recognize the vehicle system dynamics
CO 2: Evaluate the driving/ braking resistances and their influences on vehicle dynamics
CO 3: Identify and analyze the dynamics systems such as suspension systems, body vibrations, steering mechanisms.
CO 4: Analyze and solve engineering problems related to vehicle dynamics.
CO 5: Comparing and identifying the different types of control systems in automobiles
TEXT BOOKS
1. Rajesh Rajamani, “Vehicle Dynamics and Control”, 2nd edition, Springer, 2021.
2. Singiresu S. Rao, “Mechanical Vibrations”, 8th Edition, Prentice Hall, 2018.
3. Thomas D. Gillespie, “Fundamentals of Vehicle Dynamics”, Society of Automotive Engineers Inc., 2021.
4. Wong. J. Y., “Theory of Ground Vehicles”, 5th Edition, Wiley-Interscience, 2022 .
5. N.K. Giri, “Automotive Mechanics”, Kanna Publishers, 2007.
REFERENCES
1. J. Y. Woung – John Willey & Sons “Theory of Ground Vehicles “, NY ,5th Edition,2022
2. J. G. Giles,” Steering, Suspension &Tyres”, Ilete Books Ltd., London,1968
3. W. Steed “Mechanics of Road Vehicles “, Ilete Books Ltd. London,1960
4. P. M. Heldt, “Automotive Chassis”, Chilton Co. NK
5. Gillespie.T.D., “Fundamental of vehicle dynamic society of Automotive Engineers “, USA, 2021 Revised Edition.
6. Rajesh Rajamani, “Vehicle dynamics and control”, Springer publication,2014
7. Reza N Jazar, “Vehicle Dynamics: Theory and Application”, Springer publication,3rd Edition,2018