Week 18… Vehicle Dyanmics

Vehicle dynamics
Factors affecting vehicle dynamics…

1. …..Introduction of Automotive
2. Overview of Newtonian laws of motion
   Resistance –
   Ref.
   http://mehanizacija.ftn.uns.ac.rs/wp-content/uploads/2017/07/Part-12.pdf
3. Tire and Behavior
   Tyre behaviour: longitudinal slip
   Tyre behaviour: side slip

Factors affecting lateral force / side slip dependency:

Powertrain – Power transmission
Engine-to-wheel torque transmission

Performances: acceleration, top speed, gradeability

Create/Read Vehicle Performance Graph.
Traction force diagram
Performance determination: graphical approach

Braking performances

1. Longitudinal Dynamics
   at stationary
2. Longitudinal Dynamics
   at constant speed
3. Longitudinal Dynamics
   when acceleration
4. Longitudinal Dynamics
   when deceleration

Lateral vehicle dynamics
Forces and motions mainly in lateral direction
Predicting cornering performances, handling, stability…

Drivetrain and braking
Automobile layout
Powertrain
Braking system

1. …..Suspension and steering
   Ackermann steering geometry
   Axle track
   Camber angle
   Caster angle
   Ride height
   Roll center
   Scrub radius
   Steering ratio
   Toe
   Wheel alignment
   Wheelbase

3.Distribution of mass
Center of mass
Moment of inertia
Roll moment
Sprung mass
Unsprung mass
Weight distribution

Aerodynamics
Automobile drag coefficient
Automotive aerodynamics
Center of pressure
Downforce
Ground effect in cars ***