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Finding the equation of motion of a point on a link

Finding the equation of motion of a point on a link

Finding the equation of motion of a point on a link

I am working on a SolidWorks project of my own doing and I need to be able to come up with a set of parametric equations that describe the x and y coordinate of a point on a linkage. I figured that Adams could possibly help me with this. I've been trying to come up with the equation on my own but I keep getting stuck.

Description of the problem:
There are 5 links. The black linkage is constrained to move only in the vertical direction (the mid point is constrained on the y-axis). The configuration shown is the initial state of the geometry. The 13.50 diameter circle is only there for geometry purposes for the creation of the black linkage; the ends point do not remain on the circle as the smaller linkages move.

The smaller linkages are constrained at the origin, they only have rotation. The endpoints do remain on the 4.50 diameter circle. The smaller linkages counter-rotate with respect to each other, i.e one moves clockwise the other moves counter-clockwise. They both rotate at the same angular velocity.

Will Adams "trace" the motion path of a specified point? SolidWorks does, but lacks any analysis tools for the path. You can actually use this traced path in a part. However, the path is not equation driven, only point driven. Herein lies the problem, the curve is not smooth since the curve is made by points. I would like to see if Adams could get me the equation of motion of a specified point. Attached is an image of what I am working with.

RE: Finding the equation of motion of a point on a link

No ADAMS has no real understanding of equations. You can certainly attach a marker and record its position against time, and you could also record the rotation angle of the input arm at the same time, but that is not an equation.


Greg Locock

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RE: Finding the equation of motion of a point on a link

Upon finally learning how to create the links and getting a simulation, I realized the same as you. No forward kinematics solver. I have stumbled upon an addin to MATLAB called SimMechanics. You can load in CAD models and it will find the equations for you.

RE: Finding the equation of motion of a point on a link

You can use regression with Matlab or Microsoft Excel knowing some points of you path curve.

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