Vehicle Ride and Handling Analysis

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Vehicle Ride and Handling Analysis

Introduction

This tool lets you experiment with the steer- and camber-by-roll coefficients of a 3-DOF vehicle model, and simulate the effect on the yaw gain curve and the understeer coefficient. To use this tool, do the following:

•	Enter the vehicle mass, inertial, geometric and compliance properties, then the natural-frequency requirements for the suspension.

•	Click Compute Parameters to determine the stiffness and damping coefficients.

•	Adjust Steer-by-Roll and Camber-by-Roll factors.

•	Set up simulation properties and click Run Simulation.

Mass and Inertia

Geometry

Vehicle curb weight	$kg$
Total vehicle sprung mass weight	$kg$
Unsprung weight per wheel, front	$kg$
Unsprung weight per wheel, rear	$kg$
Vehicle inertia about z axis	$kg \cdot m^{2}$
Sprung mass inertial about x axis	$kg m^{2}$

Wheel base	$m$
Track ( front and rear)	$m$
Distance of CG from front axle (a)	$m$
Distance of CG from rear axle (b)	$m$
Vehicle CG height	$m$
Sprung mass CG height	$m$
Roll center height ( front/rear)	$m$

Compliances

Requirements

Tire cornering stiffness (front and rear)	$N {rad}^{- 1}$
Tire vertical stiffness	$N m^{- 1}$
Tire camber stiffness (front and rear)	$N {rad}^{- 1}$
Front shock absorber rate ( per wheel)	$N m^{- 1} s^{- 1}$
Rear shock absorber rate ( per wheel)	$N m^{- 1} s^{- 1}$
Distance between installation point of left and right springs (front and rear):	$m$
	$m$
Distance between installation point of left and right shock absorber (front and rear):	$m$
Installation factor for springs and shock absorbers for front and rear wheels	$m$

First natural frequency of front suspension	$Hz$ $rad \cdot s^{- 1}$
First natural frequency of rear suspension	$Hz$ $rad \cdot s^{- 1}$
Anti-roll-bar on front axle, Roll Gain	$\deg g^{- 1}$

Calculated Parameters

Understeer/Oversteer

Front Suspension Stiffness, $k__sF$
Rear Suspension Stiffness, $k__sR$
Overall Torsional Stiffness, $K__t$
Overall Torsional Damping, $C__t$
Anti Roll-Bar Torsional Stiffness, $K__ARB$