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Checklist of Kinematic Parameters for a New Suspension Design
Posted: 19 May 04 (Edited 19 May 04)
Here's a list we compiled of the suspension-related kinematic characteristics that need to be considered when designing a vehicle from scratch. By its nature this is a top down approach. I've tried to edit out the redundant entries, but can't claim it is 100% sorted. It obviously is not complete, let me know if you want to add things.
1 WHOLE VEHICLE:
Sprung CG X and Z
Moments of inertia
Maximum steady state lateral acceleration
roll stiffness (degrees per g of lat acc)
ride frequency, including front to rear percentages
lateral weight transfer percentage distribution front to rear
Torsional stiffness of the body structure
Roll axis gradient and any gradient change relative to roll
roll couple distribution
2 AXLE and WHEEL:
2.1 Packaging and general
tyre size, hence rolling radius
Static toe setting
Tractive Force Steer
Brake Force Steer
static castor setting
2.5 Roll centres
roll center height at design load
roll centre height gain
TLLTD (tire lateral load tranfer distribution)
track gain in roll
semitrack gain, ie lateral displacement of contact patch per unit of jounce travel
2.7 King Pin Geometry and Steering
steering axis angle
Lateral force steer (deg/g)
Aligning torque steer (Nm/deg)
Stiffness of the major suspension mounting points, ie on a McPherson Strut, do the strut towers move around
Aligning torque Camber compliance (small effect)
Lateral Stiffness (at ground w/o tire)
Fore-Aft Stiffness (at wheel center w/o tire)
Lateral Force Camber Compliance
Side View Swing Arm Angle (SVSAA)
Back to Automotive suspension engineering FAQ Index
Back to Automotive suspension engineering Forum
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