Modal Analysis of Crank Shaft Using Beam Equivalent Model
Essay by Chris1dec • August 19, 2017 • Coursework • 555 Words (3 Pages) • 1,000 Views
Essay Preview: Modal Analysis of Crank Shaft Using Beam Equivalent Model
FEM PROJECT
CRANK SHAFT ANALYSIS
Problem: Modal analysis and harmonic loading analysis of crankshaft using beam model
In this problem, we converted a 3D element to a beam model element as it is easy to compute and gives pretty much accurate results.
The following 3 D model was used as a reference and we equated moment of inertia of the 3 d model elements and beam elements to get the reff for the beam model.
[pic 1]
The following pictures depict the formulae used for getting the reff.
The FEM analysis is explained via the following pictures:
Part :
Make a line of 320 mm in part
Properties: We used grey cast Iron as the component .
Insert the properties
Density = 7200 kg/m3
Young’s modulus = 6.62e10
Poisson’s ratio = .27
Create section:
Select a section and select it as beam
Assigned section to it
Similarly do for the other parts created by edge partition of initial length
Assign beam orientation:
Click assign beam orientation and select the whole line
Assembly:
Go to assembly and click to create instance and select bar then ok
STEP :
FOR FIRST 20 NATURAL FREQUENCY
BOUNDARY CONDITIONS:
FIXING THE BOTH ENDS OF THE CRANK SHAFT
MESHING :
VISULIZATION:
FIRST MODE (280.17)
SECOND MODE ():
THIRD MODE(2358.1):
FOURTH MODE(2620.3):
IFTH MODE(5042.6):
SIXTH MODE(6356.7):
SEVENTH MODE(8530.1):
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