MBD - Project 2 - Simulation on a Piston Assembly.

1) INTRODUCTION :

A piston is a component of reciprocating engines, reciprocating pumps, gas compressors, and pneumatic cylinders, among other similar mechanisms. In an engine, its purpose is to transfer force from expanding gas in the cylinder to the crankshaft via a piston rod and/or connecting rod. In a pump, the function is reversed and force is transferred from the crankshaft to the piston for the purpose of compressing or ejecting the fluid in the cylinder.

2 ) AIM -To design and simulate the piston assembly in Solidworks and to obtain various plots for the conditions given.

3) OBJECTIVE

In this, the main objective is to do motion analysis of piston assembly by Designing different Parts of the Piston Assembly and Assemble them in SolidWorks. The various conditions are;

S. NO.	Wrist Pin Offset	Crank Speed (RPM)
1.	0 mm	2000
2.	10 mm Positive	2000
3.	10 mm Negative	2000

4) PROCEDURE:

The piston assembly- motion analysis begins with the individual part design which is then assembled and then simulated.

5 ) Part Design:

PISTON DESIGN:

The piston is the primary mechanical component which transfers power from combusting fuel to the crank with the help of a connecting rod.

GUDGEON PIN:

In internal combustion engines, the gudgeon pin connects the piston to the connecting rod and provides a bearing for the connecting rod to pivot upon as the piston moves.

CRANK:

A crank is an arm attached at a right angle to a rotating shaft by which circular motion is imparted to or received from the shaft. When combined with a connecting rod, it can be used to convert circular motion into reciprocating motion, or vice versa.

END CAP:

The end cap is the extended part (can be assembled with a connecting rod by threaded bolts) of the connecting rod and it can be designed with the connecting rod dimensions.

CONNECTING ROD:

A connecting rod is the part of a piston engine that connects the piston to the crankshaft. Together with the crank, the connecting rod converts the reciprocating motion of the piston into the rotation of the crankshaft. The connecting rod is required to transmit the compressive and tensile forces from the piston, and rotate at both ends.

ASSEMBLY:

6) SIMULATION & ANALYSIS:-

CASE 1 (0 mm offset )

PLOT

CASE 2 – 10 mm offset (Positive)

PLOT

CASE 3 – 10 mm offset (Negative)

PLOT

7 )CONCLUSION:

From the above plots, it was clear that the linear displacement was almost the same for all the plots but there will be slight variation due to the offset provided.

The offset was provided in order to vary the stress acting on the connecting rod which was stressed under various loads acting on the piston. without offsetting the line of action of power transmission is caused impact load on the assembly which is harmful during operation.

Linear displacement produced in different cases are :

1. 0 mm offset - 302.708 mm

2. 10 mm positive offset - 302.522 mm

3. 10 mm negative offset - 302.521 mm

8 ) ANIMATION VIDEO:

0 mm offset = https://youtu.be/TH-TE54mdFQ

10 mm -ve offset = https://youtu.be/-cWHnC2eXEY

10 mm +ve offset =https://youtu.be/ifdWiTw9Gsk

9 ) Part Files

Drive LINK = https://drive.google.com/drive/folders/1_IfMgoQg_hNDSZn9OOCPKplLbCEcxcqV?usp=sharing