Final Project
Cornering stiffness front=1000-825/1000-500=262.17-x/262.17-167.23……x=228.9 ib/deg
Camber stiffness front=1000-825/1000-500=17.76-x/17.76-8.37 ….x=14.4735 ib/deg
Aligning stiffness front=1000-825/1000-500=35.12-x/35.12-9.27….x=26.07 ib/deg
Cornering stiffness rear=1000-550/1000-500=262.17-x/262.17-167.23……x=176.7 ib/deg
Camber stiffness rear=1000-550/1000-500=17.76-x/17.76-8.37 ….x=9.309 ib/deg
Aligning stiffness rear=1000-550/1000-500=35.12-x/35.12-9.27….x=11.86 ib/deg
parameter selection: Note: Detailed understeer budget calculations are in the excel sheet
-those parameters were chosen as they were found to increase the understeer gradient:
Front rear
|
Roll steer |
% |
6.5 |
8 |
|
Roll camber |
% |
90 |
50 |
|
Lateral force compl steer |
deg/kN |
0.05 |
0.015 |
|
Lateral force compl camber |
deg/kN |
0.3 |
0.15 |
|
Aligning torque compl steer |
deg/100 Nm |
0.4 |
0.06 |
Targets achieved:
|
Target required |
Target achieved |
|
Roll gradient:3.50-3.80 deg/g |
Roll gradient=3.79 deg/g |
|
Understeer gradient: as max as possible |
Understeer gradient=2.06 deg/g |
load = [500, 1000, 1500, 2000];
Cs = [167.23, 262.17, 301.75, 269.86];
Cy = [8.37, 17.76, 25.30, 29.90];
Cal = [9.27, 35.12, 57.26, 75.36];
plot(load,Cs,'linewidth',2);
hold on
plot(load,Cy,'linewidth',2);
hold on
plot(load,Cal,'linewidth',2);
title('Load vs stiffness');
xlabel('Load (lb)');
ylabel('stiffness (lb/deg)');
legend('Cs','Cy','Cal');
grid on