Kinematics Ch01C-I Grueblers Criteria for 3D 5 Bar
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- เผยแพร่เมื่อ 3 ต.ค. 2024
- Created with MicroStation www.Bentley.com This video clip analyzes an ingenious Door Concept created by Klemens Torggler ( • Video ) - a five bar mechanism that briefly transits into 3D space while opening/closing. Gruebler's criteria may seem to suggest 5 bars are impossible. But that is only in 2D! In 3D, well constrained mechanisms with odd number of links are possible.
With many thanks to Mr. Torggler for his kind permission to bring this to you!
You can see more of his wonderful kinetic art and creations at torggler.co.at/
A novel door! Created by Klemens Torggler, this changes what has not changed for millennia! And the kinematics behind this is just as interesting. Here is how the Motion criteria can be analyzed to find it Degrees of Freedom.
Uma ideia bem desenvolvida... Uma Nova Porta muito interessante!
Thank you for the clarity
The pleasure is all mine! This was a delight to make!
why wheels (axle) of a car while turning should form concentric circle
Hi sir I admire your knowledge on this subject and especially the way you explain it .....May I know which books you referred for studying the subject...I am a mechanical engineering student preparing for GATE and your videos have immensely helped me...Please guide me...
Thank you for your comment and wish you the best of success in GATE! There are several great books I can recommend: Eardman & Sandor, Ghosh & Mallik, Hartenberg, Hinkle come to mind immediately. (Please check the spellings of the author names). Theory of machines by Bevan is also a very good. But I would advise you to look at the time frame and plan accordingly. These books are great for understanding and gaining mastery, but from a time bound, exam oriented preparation, there could be some others that I do not know.
UjjwalRane Thanks so much for the prompt & helpful reply
How movable hinges have only 1 dof?
Hinges, joints (or kinematic pairs as the textbooks may call them) have two parts (that explains the 'pair' part). The relative motion between these two parts is the actual contribution of the kinematic pair. If it is moving as a whole, it is not *because* of the pair and cannot be counted as the degree of freedom of the pair.
How you can Open the door from the other side ?
Hmm . . . don't have a physical door I can try out on, but here is my suggestion based on the constrained motion:
From one side pull the knob (the globular pair) and slide it sideways.
From the other side, push outward on the red panel joint and then push down the green panel from it's top edge.
which the name of the third bearing that is in the middle.
Right at the center of the whole door is a Globular Pair, better known as 'Ball Joint'. Was that the one you were referring to?
Yes
Yes
you know the name
please tell me whether globular pair available on sale?
+рафаэль мирзоян I guess it must be available. But under a different name and possibly a different look. Try asking for 'Ball joint' or 'Ball and Socket joint' The hardware shops may have something equivalent.
you already made a door that
No I have made only a virtual model here, not a physical model.
А можно по русски ?!?!