Multi-Body Dynamic Simulation on a Piston Assembly using SOLIDWORKS

Objective: To simulate the motion of a piston assembly using SOLIDWORKS

Using motion simulation tool in SOLIDWORKS, the working of a Piston Assembly is simulated

The results should include the displacement of the Piston head with respect to time for three different cases

A piston assembly contains the following components:

1. Piston head
2. Connecting rod
3. Crank
4. Wrist pin
5. End Cap

The simulation is done for 3 cases:

Case-1: No offset between wrist pin and crank axis

Case-2: Positive offset of 10 mm between wrist pin and crank axis

Case-3: Negative offset of 10 mm between wrist pin and crank axis

Procedure:

• The individual components of the piston assembly are modelled in SOLIDWORKS and then assembled by applying proper mates
• The motion analysis is done by applying rotation to the crank with an angular speed of 2000 RPM
• Gravity effect is enabled
• Contacts between the Individual components are activated
• All materials are assigned as steel

Modeling:

Piston head:

Connecting Rod:

End Cap:

Wrist pin:

Crank:

Assembly:

Results: The results represent the plot of displacement of piston head w.r.t. time for all the three cases. From the plot, no actual difference can be identified between the displacement values of piston for different cases. However, on inspection of the individual Displacement vs Time data, the difference can be found