Week 7-Long Piston With Cam

Aim :- The main aim of the week challenge is to perform a transient structural analysis of long piston with cam. The analysis is performed for three cases with frictionless contact, frictional contact with 0.1 and 0.2 as frictional coeffiecient . From all the three cases compare the results of the stress, strain and deformation plots with a detailed explanation for the plots.

Procedure:-

Step 1: Open the ansys workbench module and select the transient structural analysis.

Step 2: Right click the geometry tab and select import geometry --> browse-->select the file--> open.

Step 3: Now open the geometry in mechanical moduller.

Step 4: Now assign the material for the cam, barrel and follower.

Step 5: Now create the contact between the barrel and follower, follower and cam.

Step 6: Now create the necessary joints the components to get the appropriate motion.

Step 7: Now create a mesh sizing of 3mm for the contact face between follower and cam and mesh the model.

Step 7: Now run the simulation.

- Now include the total deformation, Equivalent stress and strain in output files.

- Now change the model as per the question and run the simulation.

- Compare the result plot and give a detailed explanation.

Results:-

Case 1:

Directional Deformation:-

Equivalent stress:

Equivalent strain:

Conclusion:-

- As we know that it is never possible to have complete frictionless contact between cam and follower.

- So minimum friction is desired for any mechanisms.

- As per results, we can observe that as the friction increase, stress and strain values increase and deformation due to higher pressure also increases.

- When friction is higher, pressure on the tip of the follower, where it is in contact with the cam, gets deformation. It can bend or twist due to the following path of the cam.

- So, Minimum friction between cam & follower gives better results as case i

- Friction coefficent plays the important role in cam & follower because of the transmission of the rotary motion to translation motion. Also, the following path is also important.

- In barrel type of cam, there can be the number of turns that are followed by the follower, so by minimizing the friction, we can achieve better results in terms of proper transmission and it the mechanism can work longer.

Animation Links:-

1. https://drive.google.com/file/d/19DHoT8voWR9zlehGL_mI291YsZ66L-LL/view?usp=sharing

2.https://drive.google.com/file/d/1pAFJ9zBmAwM9oHFlVICsiuCn2UOqdldd/view?usp=sharing

3. https://drive.google.com/file/d/1cCg9A7rRXFctSlLYZVO0o1J7HC9DPiPS/view?usp=sharing

4. https://drive.google.com/file/d/1o2c6vLuu1J9clo30Y-92IIc_0QX6pNT_/view?usp=sharing