Plotting velocity of a piston

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Mike
Mike on 4 Oct 2012
Hi everyone,
At the moment I'm trying to use MATLAB to plot velocity of a piston for an engineering report but I'm having trouble with my values. I have an equation for the velocity as a function of the angle of the crankshaft from vertical, and this is my code so far:
>> x=0:360; %0-360 deg rotation
>> b=asind(.0405*sin(x)/.13); the angle I need in my equatin, based on x
>> y=29.688*(sin(0+b))/(sin(90-b)); the equation of velocity of the piston
So for each value of x I have a value for b, but y only comes up with one value, rather than 361. I've been going through help files in MATLAB but to no avail. Can anyone guide me?
Thanks,
Mike

Accepted Answer

Matt Fig
Matt Fig on 4 Oct 2012
Edited: Matt Fig on 4 Oct 2012
You probably wanted element-by-element division rather than array division...
y=29.688*(sin(0+b))./(sin(90-b)); % Note ./ rather than /
  1 Comment
Mike
Mike on 4 Oct 2012
Thanks heaps mate: I'm still new at using it, and that gets me everytime!

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More Answers (1)

Walter Roberson
Walter Roberson on 4 Oct 2012
sin() operates on radians, but you are feeding it degrees. sind() is the degree equivalent.
  1 Comment
Mike
Mike on 4 Oct 2012
Thanks for clarifying that Walter, I saw sind in the help file and was wondering what it represented :)

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