Long Piston With Cam

AIM:

• To perform transient structural analysis of Long piston and cam model and evaluate the results for Frictionless, Frictional 0.1 and Frictional 0.2 contacts.

OBJECTIVES OF THE PROJECT:

• To assign Structural steel material for the parts.
• To define the contacts for the cam, follower and barrel.
• To define barrel and Cam as rigid bodies.
• To define Joint loads.
• To mesh the model.
• To define face sizing for the contact faces.
• To evaluate the stress, deformation and directional velocity in the work piece.

PROCEDURE:

• Case 1 – Frictionless
• OPEN WORKBENCH21 > NEW PROJECT > TRANSIENT STRUCTURAL.
• This will start a new transient structural project.
• Rename the project as Frictionless.
• Go to ENGINEERING DATA > STRUCTURAL STEEL.
• Then double click on Geometry. This will open the Spaceclaim.
• 
• In Space claim check the model for any dents or irregularities.
• The geometry looks good, exit the Spaceclaim.
• Then double click on Model. This will open Mechanical module.
• Now, rename the geometry as Barrel, Barrel cam and Follower.
• Then assign Structural steel material to all the parts.
• 
• Then go to CONTACTS > CONTACT > TYPE = FRICTIONALESS.
• 
• Create contacts for Follower to Barrel and Follower to Barrel cam.
• 
• This will define the contacts for both the parts.
• CONNECTIONS > INSERT > JOINT LOAD > BODY-GROUND > TYPE = FIXED > SCOPE = BARREL FACE.
• 
• CONNECTIONS > INSERT > JOINT LOAD > BODY-BODY > TYPE = TRANSLATIONAL > SCOPE = BARREL FACE > SCOPE = FOLLOWER.
• 
• CONNECTIONS > INSERT > JOINT LOAD > BODY-GROUND > TYPE = REVOLUTE > SCOPE = BARREL CAM FACE.
• 
• This will define the Joint loads.
• Now, go to MESH > INSERT > SIZING > ELEMENT LENGTH = 3MM > SCOPE = CONTACT FACES > MESH > SIZING > ADAPTIVE SIZING = NO > GENERATE MESH.
• 
• The mesh will be generated on the model.
• 
• Then go to STATIC STRUCTURAL > ANALYIS SETTINGS > NO OF STEPS = 9 > FOR STEP 1 > INITIAL TIME STEP = 0.1 > MAXIMUM TIME STEP = 5E-2 > MINIMUM TIME STEP = 0.2 > LARGE DEFLECTION = ON > WEAK SPRINGS = PROGRAM CONTROLLED > STABILIZATION = CONSTANT > ENERGY DISSIPATION RATIO = 0.1 > ACTIVATION FOR FIRST SUBSTEP = YES.
• 
• Then go to STATIC STRUCTURAL > ANALYIS SETTINGS > NO OF STEPS = 9 > FOR STEPS 2-9 > INITIAL TIME STEP = 0.1 > MAXIMUM TIME STEP = 5E-2 > MINIMUM TIME STEP = 0.3 > LARGE DEFLECTION = ON > WEAK SPRINGS = PROGRAM CONTROLLED > STABILIZATION = CONSTANT > ENERGY DISSIPATION RATIO = 0.1 > ACTIVATION FOR FIRST SUBSTEP = YES.
• 
• Go to STATIC STRUCTURAL > INSERT > JOINT = REVOLUTE – GROUND TO BARREL > TYPE = ROTATION > MAGNITUDE = TABULAR DATA.
• 
• 
• Then, go to SOLUTION > INSERT > STRESS > STRAIN > DIRECTIONAL VELOCITY.
• 
• This will set the output results.
• Then SOLUTION > SOLVE.

• Case 2 – Frictional – 0.1
• Create a duplicate project of the case 1.
• Then open Mechanical module.
• In this case, change the CONTACT TYPE = FRICTIONAL > FRICTION FACTOR = 0.1.
• 
• Go to SOLUTION and SOLVE.

• Case 3 – Frictional - 0.2
• Create a duplicate project of the case 1.
• Then open Mechanical module.
• In this case, change the CONTACT TYPE = FRICTIONAL > FRICTION FACTOR = 0.2.
• 
• Go to SOLUTION and SOLVE.

RESULTS:

• Case 1 – Frictionless
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• Case 2 – Frictional – 0.1
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• Case 3 – Frictional - 0.2
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COMPARISON TABLE:

	Stress (Mpa)	Strain	Deformation (mm)	Velocity (mm/s)
Case 1	1756.6	8.8296e-3	35.921	5.2834
Case 2	1846.5	9.5868e-3	35.921	5.27
Case 3	2319	1.1997e-2	35.921	5.2715

• Here, we can observe that the stress developed in Frictionless is less than the stress developed in the Frictional contacts.
• The deformation is observed to be constant.
• There is also slight change in the velocity of the follower.
• The results vary as the contacts are changed to friction and also when the friction coefficient values is increased.
• As friction acts, more stress is developed and velocity of the follower is reduced as friction resists the movement of follower for some value.

LEARNING OUTCOMES:

• To setup transient structural analysis
• To assign material from the material library.
• To define contacts for the barrel, barrel cam and follower.
• To define joint loads.
• To define rotation for barrel cam.
• To deploy mesh on the geometry.
• To define output results.

CONCLUSION:

• By performing this project we conclude that the Transient analysis of Long piston and cam model is performed and the directional velocity .results are obtained.

MODEL LINK:

https://drive.google.com/file/d/1XSmzUrxqJwiuOdtSQnJxLoS7kYdQ7y61/view?usp=sharing