Official Baja SAE Forums Homepage
Forum Home Forum Home > General > File Depot
  New Posts New Posts RSS Feed - Speed Calculation
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Speed Calculation

 Post Reply Post Reply
Ghost View Drop Down
Bolt Sorter
Bolt Sorter

Joined: Apr/09/2016
Status: Offline
Points: 20
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ghost Quote  Post ReplyReply Direct Link To This Post Topic: Speed Calculation
    Posted: Aug/30/2016 at 10:31pm
Does anyone have any input into this MATLAB code for max vehicle speed? How would you incorporate CVT and gearbox ratio into this equation. I found this on a teams report, I do not take ownership of this code.

% This Program will allow for a maximum vehicle velocity to be calculated
% from a number of given inputs
% Maximum Power at the rear wheels (assuming 85% efficient driveline)
Pmax = 550*.84*(8.9); % (ft*lb/s)

% Frontal Car Area
A = 2016/144; % sq ft

% Drag Coefficient
Cd = 1.08;

% Density of Air at standard conditions
rho = 2.38 * (10^(-3)); %slugs/(cubic foot)

% Vehicle weight
W = 420; %lbf

% Coefficient of Rolling Resistance
Crr = .068;

% Maximum Vehicle Velocity (Just an initialization)
Vmax = 0; % ft/s
roots = 0;
while (1)
    RHS = (1/2)*(Cd)*(A)*(rho)*(Vmax^3) + (Crr*W)*Vmax;
    eapprox = abs((Pmax - RHS)/Pmax)*100;
    if eapprox < .1;
    fprintf('The maximum attainable vehicle velocity is approximately\n')
    fprintf(' %.4f  mph \n',Vmax*(3600/5280))
    Vmax = Vmax + .01;
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

This page was generated in 0.047 seconds.