I need to solve and plot time, acceleration, velocity, and dsiplacement using a force equation that is in terms of Velocity.

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Jacob Ridenour 2019-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/446101-i-need-to-solve-and-plot-time-acceleration-velocity-and-dsiplacement-using-a-force-equation-that

评论： James Tursa 2019-2-20

I would like to have time as my input and A,V,S as outputs. The changing acceleration causes the real headache. Here is my current code but I dont beleive that it is calculating the way that it should. I am using this to find quarter mile time and speed and 0-60 time .

Power = 125*(10^3); %kW

af = 2.21; %frontal area

m = 1407.497; %mass of the vehicle

rho = 1.225; %density of air

cd = .30; %Coeff of Drag res

cr = .03; %Coeff of roll res

g = 9.81; %gravity

t = 0:.1:40;

v = a.*t

F = (Power./v) - .5*rho*(v.^2)*af*cd - cr*m*g;

a = F/m;

S = v.*t +1/2*a*t.^2;

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James Tursa 2019-2-20

This is typically done in a loop, where you incrementally integrate acceleration into velocity, and velocity into position. You can't do it the way you currently have coded. E.g., that v = a.*t line will not work at all since you don't know "a" at that point.

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