Challenge

MBD Simulation on a Piston Assembly

MBD of Piston Assembly

Aim:

To create all the parts of piston assembly and assemble them in assembly workbench and run the motion analysis using SolidWorks motion study.

Objective:

To create all parts of piston assembly and assemble.
To run motion study analysis for the following cases.
To plot the linear displacement of the piston head in all three cases and then superimposing graphs by exporting them to Microsoft excel.

Theory:

A piston is a component of reciprocating & engines, reciprocating pumps, gas compressors, hydraulic & pneumatic cylinders among other similar mechanism.
It is a moving component that is contained by a cylinder and is made gas tight by piston rings.
In an engine, its purpose is to transfer force from expanding gas in the cylinder to the crankshaft via the piston rod or connecting rod.
In some engines, the piston act as a valve by covering and uncovering ports in the cylinder.
Various application is used piston assembly such as hydraulic cylinder.
Various application is used piston assembly such as hydraulic cylinder, shock absorber, fire piston & syringe.

Procedure:

Create all parts:

Crank:

A crank is an arm attached at a right angle to a rotating shaft by which circular motion is imparted from the shaft.
In a reciprocating engine, it translates reciprocating motion into rotational motion.
Crank is a rotating part of the piston assembly.

Piston head:

The piston is a moving disk enclosed in a cylinder that is made gas-tight by piston rings.
A piston aids in the transformation of heat energy into mechanical work and vice versa.
Piston is a key component of heat engines.
Piston is worked by transforming force output by expanding gas cylinder to a crankshaft which provides rotational momentum to flywheel such system is known as "reciprocating engine".

Connecting rod & End cap:

A connecting rod is the part of a piston that end connects the piston to the crankshaft together with the crank.
The connecting rod convert the reciprocating motion of the piston into the crankshaft.
The connecting rod is required to transmit the compressive and tensile force from the piston.
In an internal combustion engine. It allows pivoting on the piston end and rotation on the shaft end.
Its most common usage allows internal combustion engine and steam engine.
An end cap is the removable section of a two-piece connecting rod that provides a bearing surface for a crankpin journal.

Gudgeon Pin (Wrist Pin):

Assemble All Parts:

Motion Study Analysis:

The motion study: In the motion study the following steps are performed.

Case 1: Linear Displacement at "0 mm" Offset

In this plot x axis is Time in seconds and y axis is Linear displacement of the piston head which is move from TDC to BDC.
In this plot BDC at around 132mm to TDC 230mm.
So, the range is 98mm. So, the piston is move 98mm linearly.
This happens in the regularly and create same wave patterns.

Case 2: Linear Displacement at "10 mm" Positive Offset

In this plot x axis is Time in seconds and y axis is Linear displacement of the piston head which is move from TDC to BDC.
In this plot BDC at around 132mm to TDC 230mm.
So, the range is 98mm. So, the piston is move 98mm linearly. This happens in the regularly and create same wave patterns.

Case 3: Linear Displacement at "10 mm" Negative Offset

In this plot x axis is Time in seconds and y axis is Linear displacement of the piston head which is move from TDC to BDC.
In this plot BDC at around 132mm to TDC 230mm.
So, the range is 98mm. So, the piston is move 98mm linearly.
This happens in the regularly and create same wave patterns.

ASSEMBLY FLIE OF PISTON

Ship work like this
in your own course.