What am I doing wrong on this problem?

George Lentini

2015 9 17

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7 次查看（30 天）

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Question:

For the walking beam mechanism in the figure below, calculate and plot the x and y components of the position of the coupler point P for one complete revolution of the crank O2A. Hint: Calculate them first with respect to the ground link O204 and then transform them into the global XY coordinate system (i.e., horizontal and vertical in the figure). Scale the figure for any additional information needed.

%%Walking Beam Problem
clear all; close all; clc;
%%Variables
a=1;
b=2.06;
c=2.33;
d=2.22;
p=3.06;
gamma=31*pi/180;
theta2= zeros (360,1)
%%Main Program
for i=1:361;
      theta2(i)=(i-1)*(pi/180);
      r=d-a*cos(theta2(i));
      s=a*sin(theta2(i));
      f2=r^2+s^2;
      delta=acos((b^2+c^2-f2)/(2*b*c));
      g=b-c*cos(delta);
      h=c*sin(delta);
      theta3(i)=atan2(h*r-g*s,g*r+h*s);
      xp(i)=a*cos(theta2(i)+p*cos(theta3(i)+gamma));
      yp(i)=a*sin(theta2(i)+p*sin(theta3(i)+gamma));
end
plot(xp,yp,'color','r')
grid on
title ('title')
xlabel('title')
ylabel('title')

4 个评论
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Walter Roberson 2015-9-18

Lately, my browser has tried to render most images as if they were text, including this one. If I download the image and use a viewer then it shows up fine.

George Lentini 2015-9-20

编辑：George Lentini 2015-9-20

The path that the graph follows doesn't make sense when compared to the mechanism I am trying to calculate the positions of. For the most part, I just copied the code from a problem we did in class hoping it would work. I really have no understanding of Matlab.

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