Vehicle Ride and Handling Analysis - Maple Help
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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

Total vehicle sprung mass weight

Unsprung weight per wheel, front

Unsprung weight per wheel, rear

Vehicle inertia about z axis

Sprung mass inertial about x axis

 

Wheel base     

 

Track ( front and rear)      

Distance of CG from front axle (a) 

Distance of CG from rear axle (b)

Vehicle CG height

Sprung mass CG height

 

Roll center height ( front/rear)

 

Compliances

Requirements

Tire cornering stiffness (front and rear) 

Tire vertical stiffness

 

Tire camber stiffness (front and rear)

 

Front shock absorber rate ( per wheel)

 

Rear shock absorber rate ( per wheel)

 

Distance between installation point of left and right springs

(front and rear):

 

Distance between installation point of left and right shock absorber (front and rear):

Installation factor for springs and shock absorbers for front and rear wheels

First natural frequency of front suspension

              

First natural frequency of rear suspension

              

Anti-roll-bar on front axle, Roll Gain

 

Calculated Parameters

Understeer/Oversteer

Front Suspension Stiffness,

Rear Suspension Stiffness,

Overall Torsional Stiffness,

Overall Torsional Damping,

Anti Roll-Bar Torsional Stiffness,

 

 

 

 

 

Simulation Setup

 

Vehicle Speed

 

 

   =  

 

Steering Angle

 

  deg

 

Simulation Duration

 

    seconds

 

Results

   

   

 

 

 


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