Do you know Grasshopper Mechanism? Here is some information and model created by me and my team which surely can be helpful for your better comprehension.
Grasshopper Mechanism :
This mechanism is a modification of the Scott-Russell Mechanism which gives the approximate straight line motion. In this mechanism, the slider is replaced by a link traveling in an arc about another fixed point. It is named so because of its resemblance to a grasshopper’s hind legs!
This mechanism is a derivation of the modified Scott- Russel mechanism with the difference that Point P does not slide along straight line.
It is a four bar mechanism and all the pairs are turning pairs.
In this, O and O1 are fixed and link OA oscillates about O through an angle AOA₁. Which causes the pin P to move along a circular arc with O₁ as center and O₁P as radius. For small angular displacement of OP on each side of the horizontal, the point Q on the extension of the link PA traces out an approximately a straight path QQ', if the lengths are such that
OA = ((AP) ^ 2)/(AQ)
Where does Grasshopper Mechanism is used ?
The Grasshopper Mechanism is used in early days as an engine mechanism, with the help of this mechanism we can get a long stroke by short crank. It also can be used for agriculture purpose in crop cutting machines as well as for fabrication purpose such as wood cutting, glass cutting and metal sheet cutting.
With 3DExperience software designing and simulating the mechanism has become simpler and more efficient. We used Sketcher app for creating 2D sketch and Part Design for designing part as well as CATIA Assembly design for assembly design. Mechanical System Design and Mechanical System Experience collectively used for kinematic simulation purpose.
We thank our guides and student community leaders for providing us with opportunity to work on this mechanism and handle 3DExperience software
Downloadable Grasshopper Mechanism (3DXML)
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