MBD Simulation on IC Engine Valve Train
AIM OF THE PROJECT:
Multibody Dynamics simulation on IC engine valve train
OBJECTIVES:
To run the simulation using the below parameters:
| Sl.No | CAM Lift (mm) | Speed (RPM) | Material |
| 1 | 3.5 | 1500 | Cast Carbon Steel |
| 2 | 6 | 1500 |
Cast Carbon Steel |
To Obtain:
- Valve Lift.
- The contact force between:
- Cam and Push Rod
- Pushrod and Rocker Arm
- Rocker Arm and Valve
- Explain why the contact force between the Rocker arm and valve varies while measuring with respect to the X-direction and measuring with respect to magnitude.
THEORY:
A valvetrain or valve train is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. The intake valves control the flow of air/fuel mixture (or air alone for direct-injected engines) into the combustion chamber, while the exhaust valves control the flow of spent exhaust gasses out of the combustion chamber once combustion is completed.
CAM LIFT CALCULATION FORMULA:
RESULTS AND PLOTS:
Case - 1
CAM Lift = (L-R1)+R2
3.5 = (L-12.5)+5
L = 11mm
Plot-1
Plot-2
Plot-3
Plot-4
CASE-2
CAM Lift = (L-R1)+R2
6 = (L-12.5)+5
L = 13.5mm
Plot-1
Plot-2
Plot-3
Plot-4
CASE-3
The contact force between the rocker arm and the valve with respect to X-Direction is frictional. Which caused due to force acting while sliding of the rocker arm on the valve as shown below.
CONCLUSION:
From the plots, we can conclude that as the cam lift increases the valve lift also increases the valve lift mainly depends upon the length of the rocker arm and cam lift.
The contact force between the Rocker arm and valve varies while measuring with respect to the X-direction. because the frictional force acts between them while sliding the rocker arm on the valve.
The contact force between the Rocker arm and valve is constant while measuring with respect to magnitude. because, while measuring the magnitude the net force acting on the bodies is taken into consideration.
ANIMATION:
Google Drive Link to the Parts and Assembly file:
https://drive.google.com/drive/folders/1EtA5jzRERLpfi2f_JHujxWe-GeUAtW98?usp=sharing