Vehicle Ride and Handling Analysis - Maple Programming 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

kg

Total vehicle sprung mass weight

kg

Unsprung weight per wheel, front

kg

Unsprung weight per wheel, rear

kg

Vehicle inertia about z axis

kgm2

Sprung mass inertial about x axis

kg m2

 

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 rad1

Tire vertical stiffness

N m1 

Tire camber stiffness (front and rear)

N rad1 

Front shock absorber rate ( per wheel)

N m1 s1 

Rear shock absorber rate ( per wheel)

N m1 s1 

Distance between installation point of left and right springs

(front and rear):

 

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              rads1

First natural frequency of rear suspension

Hz              rads1

Anti-roll-bar on front axle, Roll Gain

deg g1

 

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

 

KSBRF

 

KSBRR

 

KCBRF

 

KCBRR

 

Kus   

Simulation Setup

 

Vehicle Speed

 

 

 km h1  =  m s1

 

Steering Angle

 

  deg

 

Simulation Duration

 

    seconds

 

Results