ackerman steering geometry and cornering

wat is ackerman steering?

1. VEHICLE DYNAMICS BY G.SARATH REDDY

2. STEADY STATE HANDLING CHARACTERISTICS HOW TO HANDLE THE VEHICLE….? Ackermann Steering Geometry

3. ACKERMANN STEERING GEOMETRY Ackermann steering geometry is a geometric arrangement of linkages in the steering of a car or other vehicle designed to solve the problem of wheels on the inside and outside of a turn needing to trace out circles of different radii . The use of such geometry helps reduce tyre temperatures during high-speed cornering but compromises performance in low speed . The intention of Ackermann geometry is to avoid the need for tyre to slip sideways when following the path around a curve.

4. As the rear wheels are fixed, this centre point must be on a line extended from the rear axle Intersecting the axes of the front wheels on this line as well requires that the inside front wheel is turned, when steering, through a greater angle than the outside wheel .

5. Where t = tread L = wheel base 𝛿 o = steer angle of the outside wheel in a turn 𝛿 I = steer angle of the inside wheel in a turn R = Radius of turn

6. High Speed Cornering High speed cornering produces different equations with respect to low speed cornering. Tires must develop significant lateral forces to counteract the lateral acceleration. Slip angles will be present at each wheel

7. Tire Cornering Forces Under cornering conditions,in which the tire must develop a lateral forces, the tire will also experience lateral slips as it rolls. The angle between the direction of heading and its direction of travel is called slip angle. Below about 5˚ slip relationship is linear Where ; Cα — cornering stiffness