MOTION ANALYSIS OF PISTON ASSEMBLY USING SOLIDWORKS
ABSTRACT:
In this study, the motion analysis of the piston crank is done by comparing the linear displacement with respect to time data of three cases of the piston. The three cases of the piston are taken by providing different offset to the wristpin. The position of the wrist pin is going to be varied as followed. But the center of the axis of the piston head and the crank are coincident to each other (i.e) They are on the same plane in all the three cases. Piston is provided with zero offset for case 1 analysis, 10mm positive offset for case 2 analysis, 10mm negative offset for case 3 analysis. The analysis is done by giving the crank a constant speed of 2000rpm and data is taken for 10000 frames per second for more accurate results.
INTRODUCTION:
The analysis is done by creating a model of piston crank mechanism using solidworks. The model was created by creating 5 different parts namely piston, wrist pin, connecting rod, end pin, crank in solid works and assembled in solid works. By giving proper solid body contacts which make the model work under real world physics the motion analysis is done on the model.
For the geometry the drawings of each model is given below.
CRANK:
END CAP:
CONNECTING ROD:
WRIST PIN:
PISTON WITH ZERO OFFSET:
PISTON WITH POSITIVE OFFSET OF 10MM:
similarly for PISTON WITH NEGATIVE OFFSET:
THE 3D MODEL OF THE ASSEMBLY WITH ZERO OFFSET IS SHOWN BELOW:
THE PLOT FOR THE MOTION ANALYSIS OF THE ABOVE ASSEMBLY IS GIVEN BELOW:
3D MODEL OF THE ASSEMBLY WITH POSITIVE OFFSETS:
THE PLOT FOR THE MOTION ANALYSIS OF THE ABOVE ASSEMBLY IS GIVEN BELOW:
3D MODEL OF THE ASSEMBLY WITH NEGATIVE OFFSETS:
THE PLOT FOR THE MOTION ANALYSIS OF THE ABOVE ASSEMBLY IS GIVEN BELOW:
SUPERIMPOSING THE ABOVE GRAPHS:
CONCLUSIONS:
From the above plots it is clear that
- zero offset has the displacement range of 200mm to 300mm.
- positive offset has the displacement range of 220mm to 320mm.
- negative offset also has the displacement range of 220mm to 320mm.