Understanding Degrees of Freedom


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Understanding Degrees of Freedom



Concept of DoF is well explained in this video lecture with help of animation of mechanisms. This video covers topic of higher pair, lower pair and mobility equation. Degrees of freedom of 4 bar linkage, cam and follower mechanism and 5 bar linkage are worked out here.

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39 Comments

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  1. i founf 4 DOF ( 6(3-1)-5-3-1 = 4 , -1 being for the Ball-ground contact, -3 for the the arm rotating into the ground, -5 for the pair between the two arms) for the 3D exemple at the end, is it right?

  2. in last animation i think DoF is one because all of another variables depend on rotation of first variable if the first variable rotate another variables should rotate so they are limited! who can help me understand the concept without formula thanks.

  3. I don't get it, in the second mechanism, 3:41, you say it has 4 links and 3 lower pairs, but in the formula, you put down Lp=4, which one is correct and why 4? Thank you so much for your help!!

  4. more recent clarification for advanced students! – a rigid body can also have an additional DOF in that temperature or pressure can deform it's alignment or dimensions, so in some cases it can 7 DOF. we must take in to account it's environment which may without translation or rotation, incorporate any various twisting deformation in 3 planes

  5. 1:40 why would each link would have three degrees of freedom if they were not connected? If they were not connected they could rotate around the vertical axis and translate along the horizontal axis, what is the third one?

  6. I couldn't get the 3rd no. what is the physical meaning, as we can see the wheel can rotate in a rotatory axis. On the other hand, the body is moving towards the z-axis. we have found 2 degrees of freedom, but the calculation is saying there is 1. What's wrong am I doing?
    But the video was tremendous, the level of thinking of the creator is beyond the expectation.