MBD Simulation on a Piston Assembly Using Solidworks
AIM:-
A model a piston and its associated parts i.e. piston head, wrist pin, connecting rod, end cap, and crank and MBD simulation on that. Motion analysis is done at 1200rpm and frame rate 7200fps with precision contact for three different parameters then plots of the linear displacement of the piston is considered.
Piston motion analysis:
Different parts of the cylinder piston are as follows:-
- Piston Head
- Gudgeon Pin (Wrist pin)
- Connecting rod
- End Cap
- Crank
his project aims to analyze the motion analysis of the piston and the parameters set to achieve the plots of linear displacement are given below:
Geometry of the parts:-
Piston Head:
Gudgeon Pin (Wrist pin):
Connecting rod:
End Cap:
Crank:
Final assembly:
Motion Study Analysis:-
In the Motion study the following steps are performed.
- Select motion analysis in the drop-down menu.
- Motor is given to crank with the speed 2000 RPM.
- Frames per second are given as 12000 with precise contact.
- Contact is given between endpin and crank, crank and connecting rod, connecting rod and wrist pin and wrist pin and piston. The material selected for each case is steel (Dry).
- Gravity in the Y direction.
As there are three parameters,
Case 1: Motion Analysis for "0" mm Offset:-
Case 2: Motion Analysis for 10 mm positive Offset:-
Case 3: Motion Analysis for 10 mm Negative Offset:-
Linear displacement graph from each case is exported to excel and then superimposed there.
4.Observation and conclusion:
From the plots obtained, we can see that Linear Displacement increases as we move from negative wrist pin offset to positive wrist pin offset i.e. the magnitude of the Linear displacement increases.
Also from the graph obtained after superimposing it we can see that for a given time frequency of rotation of piston with wrist pin offset negative is higher comparatively to one with zero offset and pin with zero offset has higher frequency than one with a positive offset.