Transient analysis on Long piston and Cam
TITLE: Transient analysis on a Long piston and Cam mechanism.
SUMMARY: In this project we have performed a transient analysis on a piston-cam mechanism. Our purpose behind the transient simulation is due to unsteady condition appearing on model. Here, the cam & follower model is taken under consideration and desired results are obtained after required boundary conditions are provided Respectfully.
INTRODUCTION: A Transient analysis means analysing a system in unsteady state. Here, We have Cam & Follower setup, the cam is inside a hollow tube provided with a translational joint, moving to and fro from fixed point. Meanwhile, the follower traces a fixed path as the Barrel spins along an axis. The entire simulation is run for certain steps followed by, connections, joints and Displacement. Mentioned analysis has been undergone a frictionless contact as well as with friction of coefficient 0.1 & 0.2 Respectfully.
Fig. shows Cam & Follower setup.
Here, we have provided necessary joints for the setup in order to work as desired as that the barel moves, meanwhile the follower traces the path as shown above. Also the behaviour are rigid.
Barrel cam is provided with a translation motion while, the barrel itself is assigned with revolute joint.
Once the connections are assigned on assembly, we meshed the model for an elemental size of 3mm.
Once we meshed the model, the joint loads are applied which results in rotation of the barrel for various angles, which are as follows.
CASE 1:
In first case we run the analysis with Frictionless contact, our desired parameters such as Equivalent Stress, Directional Deformation and Equivalent Elastic Strain are obtained and will be compared at last.
For frictionless contact the Analysis is simulated.
Equivalent Stress:
It can be seen that, a Max of 1697.3 MPa of Stress is generated.
Directional Deformation:
https://youtu.be/ziNX0ogOE14 A max. of 10.883 mm of Deformation has occured.
Equivalent Elastic Strain:
Here, 0.0085167 mm/mm of strain has been generated.
Meanwhile, a Force Convergence Graph can be plotted which is as follows.
Force Convergence Graph.
Followed by Time Increment Graph,
Time Increment Graph.
CASE 2:
For a Frictional coefficient of 0.1 the Analysis is Run,
Equivalent Stress:
A Max. of 1700.1 MPa of Stress is generated as shown above.
Directional Deformation:
A Max. of 10.915 mm of Directional Deformation has occured here as well.
Equivalent Elastic Strain:
Here, 0.0085345 mm/mm of Strain has occured.
Similarly, a Force Convergence Graph can be plotted which is as follows.
Followed by Time Increment Graph,
Time Increment Graph.
CASE 3:
For a Frictional Contact, with Frictional Coefficient of 0.2
Equivalent Stress:
Here, 1715.7 MPa of Max. stress is generated.
Directional Deformation:
A Max. of 10.956 mm of Directional Deformation has occured.
Equivalent Elastic Strain:
A Max. of 0.0086111 mm/mm of Strain has occured.
Now, for the mentioned Analysis a Force Convergence Graph is plotted below.
Force Convergence Graph.
Similarly, Time Increment Graph is plotted here,
Time Increment Graph.
RESULT:
Now, all three parameters for different frictional coefficients are compared below.
CONCLUSION:
- The simulation went through, all the results are obtained & compared which revaled that with increasing frictional coefficient when compared to frictionless the Equivalent Stress values changes. They results in increasing values of stresses.
- So far the Directional Deformation is Concerned, their values changes very slightly.
- However, the Equivalent Elastic Strain values does not changes significantly at all.