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Hi, i need to make a cam model in simulink so i use a spline block to model the curve.Here is my code:

clear

clc

s=0:0.005:1;i=0;

for t1=0:0.005:0.125;

i=i+1;

s(i)=(pi*t1-0.25*sin(4*pi*t1))/(pi+4);

end

for t2=0.130:0.005:0.875;

i=i+1;

s(i)=(2+pi*t2-(9/4)*sin((pi+4*pi*t2)/3))/(pi+4);

end

for t3=0.880:0.005:1

i=i+1;

s(i)=(4+pi*t3-0.25*sin(4*pi*t3))/(pi+4);

end

T=0:0.005:1;

% plot(T,s);

r=1:1:21;n=0;

for m=1:5:201

n=n+1;

r(n)=(232^2+264.2^2-2*232*264.2*cos(deg2rad(20.69+18.5*s(m))))^(1/2);

end

th=60:(110/40):170;

x1=r.*cos(deg2rad(th));

y1=r.*sin(deg2rad(th));

% figure(2);

th2=170:0.5:190;

x2=169.*cos(deg2rad(th2));

y2=169.*sin(deg2rad(th2));

th3=300:(-110/40):190;

x3=r.*cos(deg2rad(th3));

y3=r.*sin(deg2rad(th3));

x3=fliplr(x3);

y3=fliplr(y3);

th4=-60:5:60;

x4=94.55.*cos(deg2rad(th4));

y4=94.55.*sin(deg2rad(th4));

x=[x1,x2,x3,x4];

x=x';

y=[y1,y2,y3,y4];

y=y';

% subplot(5,3,1);

% plot(x,y);

% axis([-150,150,-150,150]);

CAM=[x,y];

But the curve is not smooth,please tell me what is the problem.

Massimo Zanetti
on 28 Feb 2017

If you want to approximate a set of points by a smooth curve you need a smoothing spline, not just a spline. Moreover, in your case you need the smoothing spline to be a closed curve, therefore with periodic conditions.

I have done a function to do exactly that, check it out:

Massimo Zanetti
on 28 Feb 2017

Massimo Zanetti
on 28 Feb 2017

Glad to know you have fixed. If this answer helped you, please accept it.

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