Question

1. Why we can select the position of driving link randomly when we draw a mechanism kinematic diagram?

Would this effect the correctness of kinematic diagram?

2. Design two different solutions of elliptical trainer mechanism and use mechanism kinematic diagram to express its motion scheme. Requirements are showed below:

1) Adopt linkage mechanism to approach the motion trajectory of ellipse with simple a structure.

2) Realize the motion trajectory of ellipse with high precise.

3. Why we choose cam mechanism on shoes repairing machine.

Answer 1

Answer 1. Since the position of every link relative to the driving link will remain same . So we can randomly select the position of driving link randomly.

And it won't affect the correctness of kinematic diagram because everything we calculate actually is relative . Ex. Relative velocity, relative acceleration, Position w.r.t fixed link .

Therefore, it doesn't depend on the initial position of driving link. But all links relative to that driving link must remain same.

answered by: anonymous