Crankshaft Design
With this crankshaft, I have a balancing condition problem. I've already measured the mass properties through an analysis feature, and we can see that I've captured it in a coordinate system at the center of gravity. Notice that if I turn on the axes, the center of gravity does not line up with the axis of rotation, therefore my crankshaft is out of balance. My engineering rule for this part is that the center of gravity should line up with the axis of rotation. To put that in Pro/ENGINEER terminology, I can now capture the distance between the CG and the axis in an analysis feature, and I want to drive that distance to zero. This will be one of my design constraints.
I have a second design constraint, that the amount of material between the shaft and the balancing body must be greater than .250". (This has already been created as an analysis feature that measures the distance from edge to edge. To show, turn on datum point display.)
I want to find a feasible solution that achieves both of these design rules (Feasibility study).
ANALYSIS / FEASIBILITY
Design variables: Feat #5 (select on back lobe to show dimensions):
d28=3, range 2-4
d27=4, range 3-6
d31=8, range 5-10
FEASIBILITY ANALYSIS:
This type of analysis finds a feasible solution that satisfies the constraints within the allowable ranges. We can also perform an optimization study which finds the best solution based on a goal such as to minimize or maximize mass. Here we will perform an optimization keeping the same constraints and variable ranges to minimize the overall mass.
(When the feasiblity analysis is finished, keeping the calculated dimensions will provide a better starting point for the optimization - i.e. it will run faster).
ANALYSIS / FEASIBILITY/OPTIMIZATION / move model to lower right corner before running optimization / note reduction in mass and model changes
OPTIMIZATION ANALYSIS: