Synthesis of a four bar linkage with a ternary couplar

In summary, the conversation discusses the design of a four bar linkage for a bicycle rear shock known as the virtual pivot point. The critical aspect of this design is achieving a coupler curve for the rear axle that follows an S-shaped path while also ensuring that the instantaneous center of rotation for the rear triangle is above the rear axle for compression and below for extension. The use of the Freudenstein equation for synthesis is mentioned, but the problem is deemed more complicated. The individual also mentions another explanation of this mechanism at a specific website, but notes that dimensions and limits of movement are not provided. The conversation concludes with the individual thanking the other person for their help and asking for clarification on the question.
  • #1
MechE
6
0
Hi there!
Currently i am trying to design a four bar linkage for a bicycle rear shock.
You can find this linkage at here
http://ffden-2.phys.uaf.edu/211_fall2010.web.dir/Michael_Stanfill/VirtualPivot.html
This linkage is called virtual pivot point.
Critical part of this design is to achieve a coupler curve for rear axle in a way that it traces an S shaped path but also the instantenous centre of rotation for rear triangle(ternary coupler-which is the intersection of lines passing through two small linkages) must be above the rear axle for compression and below the rear axle for extension (this way suspension mechanism corrects itself)
I thought i can use freudenstein equation for synthesis but the problem is more complicated.
Thank you for your help!
(There is another explanation of this virtual pivot point mechanism at here http://www.lapierrebikes.com.au/technologies/fps)
 
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  • #2
You have not given any dimensions or limits of movement.
What exactly is your question ?
 

1. What is a four bar linkage with a ternary coupler?

A four bar linkage with a ternary coupler is a mechanical system composed of four rigid links connected by three joints, one of which is a ternary (three-way) coupler. It is commonly used in robotics and other mechanical applications to create motion and transmit force.

2. What is the purpose of synthesizing a four bar linkage with a ternary coupler?

The purpose of synthesis is to design or create a four bar linkage with a ternary coupler that meets specific mechanical requirements, such as desired motion or force transmission. This process involves determining the geometric parameters of the linkage to achieve the desired performance.

3. What are some common methods used for synthesizing a four bar linkage with a ternary coupler?

Common methods for synthesizing a four bar linkage with a ternary coupler include graphical methods, analytical methods, and computer-aided design (CAD) software. Graphical methods involve drawing and manipulating linkages on paper, while analytical methods use mathematical equations to determine the linkage parameters. CAD software allows for more complex and accurate analysis and optimization of the linkage design.

4. What factors should be considered when synthesizing a four bar linkage with a ternary coupler?

When synthesizing a four bar linkage with a ternary coupler, factors such as desired motion, force transmission, load requirements, and available space and resources should be considered. Other important considerations include the type of coupler used, the number and placement of joints, and the overall geometry and dimensions of the linkage.

5. What are some applications of a four bar linkage with a ternary coupler?

A four bar linkage with a ternary coupler has a wide range of applications, including in robotics, machinery, and biomechanics. It is commonly used in robotic arms and grippers, as well as in door mechanisms and suspension systems. In biomechanics, it can be used to model and analyze human or animal movement.

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