VEHICLE DYNAMICS

INTRODUCTION OF VEHICLE DYNAMICS :

Approaches and assumptions

  • Full vehicle model, general driving situation:
  • Many degrees of freedom
  • Many inputs and outputs, complex relationships
  • carthrottle.com
  • System of coupled non-linear differential equations
  • Not appropriate for analytical study
  • Experimental approach, CAE modeling and simulation
  • Simplified models, restricted driving maneuvers:
  • Less DOF
  • Restricted number of I/O’s
  • Possibility of ODE linearization
  • Manageable math, appropriate for analytical study
  • Gaining insight into main physical relationships
  • Some aspects of basic engineering analysis carried out easily

Longitudinal vehicle dynamics :
Forces and motions in longitudinal direction, smooth road surface
Predicting top speed, acceleration and braking performances, gradeability, fuel
consumption…

Lateral VD :
Forces and motions mainly in lateral direction
Predicting cornering performances, handling, stability

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