MBD Simulation on a Piston Assembly

Aim: To model parts of piston assembly and simulate the piston assembly in three condition.

Objective:

1. To model parts and assemble the Piston Assembly.
2. To perform motion analysis at different wrist pin offset values.
3. To analyse the resulting plots.

Steps :

1. create 3d model and assemble them .
2. to perform motion analysis select the solidwoks motion .
3. apply motor on the axis of crank of 2000 rpm
4. apply contact beween all the parts
5. crate the plot for all three condition of pistion assembly.
6. plot the graph and export the graph in excel sheet and create super impose graph of three condition

3d model parts

connecting rod crank

piston head pin

connnecting rod end cap

piston assembly

motion analysis

case 1 = "0" mm Offset

plot 1 displacement of piston head vs time

case 2 = 10 mm Positive Offset - crank rotation is in the Clockwise direction.

plot 2 displacement of piston head vs time

case 3 = 10 mm Negative Offset - crank rotation is in the Clockwise direction.

plot 3 displacement of piston head vs time

Super imposed graph

Conclusion:

thus we created the model ans done thwe motion analysis .The Motion Analysis of the Piston Assembly helps us to assess the working of a Slider-Crank Mechanism. Providing Offset offers much less resistance leading to more engine speed and power. It also helps to relieve the stress induced in case the Piston reaches the Top Dead Centre (TDC) and the Bottom Dead Centre (BDC).With offset, the stroke of piston is reduced. This can be used to slightly alter the piston kinematics in an engine.The horizontal lag has no significance since the time period is still the same.Offsetting might prevent the mechanism from locking in a toggle position since the force on connecting rod will never be in line with it. This can make the engine self-starting.

Youtube animation link:

https://www.youtube.com/watch?v=5-SSJzqbm8I

Drive link for parts:

https://drive.google.com/drive/u/1/folders/1BoQL0TBjhC3IZrhd_uWgx-4Cn4wPUXyz