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Formula SAE
Vehicle Dynamics Terminology List
86
Engineering
Professional
06/28/2009

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Cards

Term
Oversteer
Definition
Term
Understeer
Definition
Term
Understeer gradient in deg/g
Definition
Term
Ultimate tensile stregth 
Definition
Term
Modulus of elasticity
Definition
Term
Difference bet strength and stiffness
Definition
Term
Torsional rigidity by FEA
Definition
Term
Torsional rigidity by physical measurement
Definition
Term
Torsional rigidity profile or slope
Definition
Term
Installed stiffness
Definition
Term
Bump (construction)
Definition
Term

Droop (construction)

 

Definition
Term

Roll (construction)

 

Definition
Term

Heave (construction)

 

Definition
Term

Warp (construction)

 

Definition
Term
Ride rate
Definition
Term
Wheel rate
Definition
Term
Spring rate
Definition
Term
Motion ratio (installed ratio)
Definition
Term

Body un-damped natural frequency

(hop and tramp)

Definition
Term
The effect of "stiction" or friction in suspension pivots
Definition
Term
Damping ratio
Definition
Term
Single tube shock absorbers (dampers)
Definition
Term

Double tube shock absorbers (dampers)

 

Definition
Term
Shock absorber bump
Definition
Term

Shock absorber droop

 

Definition
Term
Shock absorber piston speed
Definition
Term
Shock absorber nose pressure
Definition
Term
Shock absorber hysteresis
Definition
Term
Critical damping
Definition
Term
Roll stiffness
Definition
Term
Percentage of roll stiffness from springs/anti-roll bars
Definition
Term
Roll stiffness per transverse g.,front and rear
Definition
Term

Static load distribution

 

Definition
Term
Lateral load transfer per transverse g.
Definition
Term
Longitudinal load transfer per g.
Definition
Term
Load transfer due to steering geometry
Definition
Term
Anti-squat coefficients and in %
Definition
Term
Anti-dive coefficients and in %
Definition
Term

Advantages and disadvantages of 

anti-squat and anti-dive geometry

Definition
Term
Roll center
Definition
Term

Roll center 

height and lateral location

Definition
Term

Roll center migration

(vertical and lateral)

Definition
Term
Roll axis
Definition
Term

Camber change in ride

(ride camber coefficient in degrees/inch)

Definition
Term

Camber change in roll

(roll camber coefficient in degrees/degrees)

Definition
Term
Camber change with steer angle due to caster
Definition
Term
Camber change with steer angle due to king pin inclination
Definition
Term
Scrub radius (steering offset)
Definition
Term
Mechanical trail (caster trail)
Definition
Term

Spindle offset

(wheel center to steering axis at spindle height)

Definition
Term
Toe in and toe out
Definition
Term
Ackerman steering geometry
Definition
Term
Modified Ackerman steering geometry
Definition
Term
Anti-Ackerman steering geometry
Definition
Term
Ride steer (bump steer)
Definition
Term

Roll steer (bump steer)

Definition
Term
Polar moment of inertia
Definition
Term
Moments fo rotational inertia
Definition
Term
Yaw Moment
Definition
Term
Roll Moment
Definition
Term
Pitch Moment
Definition
Term
Brake Pedal mechanical ratio
Definition
Term

Brake Hydraulic ratio

Front:

Rear:

Definition
Term

Brake Clamping load per 100 psi line pressure-

Front:

Rear:

Definition
Term

Brake Coefficient of friction between

disc and pad friction material at operationing temperature

Definition
Term
Hysteresis
Definition
Term
Drive Line Differential bias ratio
Definition
Term
Angular capacities fo joints used in drive shafts
Definition
Term
Drive Line angles
Definition
Term
Open differential operation
Definition
Term
Salisbury or "plate" differential operation
Definition
Term
Cam and Pawl differential operation
Definition
Term
Zexel/Gleason differential operation
Definition
Term
Spool operation
Definition
Term
Tires-coefficient of friction
Definition
Term
Tires-Slip angle
Definition
Term
Tires-Percent slip (slip ratio)
Definition
Term
Tires-Cornering stiffness
Definition
Term
Tires-Camber stiffness
Definition
Term
Tires-Self aligning torque
Definition
Term
Tires-Normal load sensitivity
Definition
Term
Tires-Load transfer sensibility
Definition
Term
Tires-Pneumatic trail
Definition
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