FREQUENCY ANALYSIS
Rotating shaft - a revolving rod that transmits power or motion. shaft. camshaft - has cams attached to it. crankshaft - a rotating shaft driven by (or driving) a crank. driveshaft - a rotating shaft that transmits power from the engine to the point of application
AIM:
To perform the Frequency analysis by creating a model provided to find out 5 mode shapes using simulation in solidworks.
OBJECTIVE:
- To find out the critical frequencies of a rotating shaft in solidworks.
- To find out 5 mode shapes of the shaft and to list out the resonant frequencies.
PROCEDURE:
To create a model of a rotating shaft in solidworks. The dimensions used are as follows:
stepped shafts== diameter 50mm extrude 75mm
rotating plate == diameter 300mm extrude 30mm
shafts== diameter 80mm extrude 1000mm(midplane)
Material Properties
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Model Reference
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Properties
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Components
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Name:
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Alloy Steel
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Model type:
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Linear Elastic Isotropic
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Default failure criterion:
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Max von Mises Stress
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Yield strength:
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6.20422e+08 N/m^2
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Tensile strength:
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7.23826e+08 N/m^2
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Mass density:
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7700 kg/m^3
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Elastic modulus:
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2.1e+11 N/m^2
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Poisson's ratio:
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0.28
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Thermal expansion coefficient:
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1.3e-05 /Kelvin
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SolidBody 1(Boss-Extrude4)(rotating shaft)
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Curve Data:N/A
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Loads and Fixtures
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Fixture name
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Fixture Image
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Fixture Details
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Fixed-1
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Entities:
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2 face(s)
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Type:
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Fixed Geometry
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Mesh information
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Mesh type
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Solid Mesh
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Mesher Used:
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Standard mesh
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Automatic Transition:
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Off
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Include Mesh Auto Loops:
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Off
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Jacobian points
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4 Points
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Element Size
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16.2929 mm
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Tolerance
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0.814647 mm
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Mesh Quality Plot
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High
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Mesh information - Details
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Total Nodes
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45149
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Total Elements
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29810
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Maximum Aspect Ratio
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5.021
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% of elements with Aspect Ratio < 3
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99.8
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% of elements with Aspect Ratio > 10
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0
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% of distorted elements(Jacobian)
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0
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Time to complete mesh(hh;mm;ss):
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00:00:05
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Computer name:
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Study Results
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Name
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Type
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Min
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Max
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Amplitude1
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AMPRES: Resultant Amplitude Plot for Mode Shape: 1(Value = 414.538 Hz)
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0.000e+00
Node: 1
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1.155e-01
Node: 1556
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rotating shaft-freqeuncy analysis-Amplitude-Amplitude1
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Name
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Type
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Min
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Max
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Amplitude2
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AMPRES: Resultant Amplitude Plot for Mode Shape: 2(Value = 414.904 Hz)
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0.000e+00
Node: 1
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1.155e-01
Node: 1591
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rotating shaft-freqeuncy analysis-Amplitude-Amplitude2
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Name
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Type
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Min
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Max
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Amplitude3
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AMPRES: Resultant Amplitude Plot for Mode Shape: 3(Value = 997.787 Hz)
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0.000e+00
Node: 1
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2.535e-01
Node: 1494
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rotating shaft-freqeuncy analysis-Amplitude-Amplitude3
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Name
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Type
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Min
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Max
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Amplitude4
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AMPRES: Resultant Amplitude Plot for Mode Shape: 4(Value = 1233.41 Hz)
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0.000e+00
Node: 1
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1.320e-01
Node: 35031
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rotating shaft-freqeuncy analysis-Amplitude-Amplitude4
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Name
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Type
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Min
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Max
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Amplitude5
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AMPRES: Resultant Amplitude Plot for Mode Shape: 5(Value = 1234.08 Hz)
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0.000e+00
Node: 1
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1.322e-01
Node: 34454
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rotating shaft-freqeuncy analysis-Amplitude-Amplitude5
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Mode List
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Frequency Number
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Rad/sec
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Hertz
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Seconds
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1
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2604.6
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414.54
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0.0024123
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2
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2606.9
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414.9
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0.0024102
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3
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6269.3
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997.79
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0.0010022
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4
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7749.7
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1233.4
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0.00081076
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5
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7754
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1234.1
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0.00081032
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Mass Participation (Normalized)
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Mode Number
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Frequency(Hertz)
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X direction
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Y direction
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Z direction
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1
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414.54
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0.18282
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0.57347
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3.2344e-08
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2
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414.9
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0.57331
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0.18279
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5.8656e-08
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3
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997.79
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3.6846e-09
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1.1586e-08
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3.1025e-09
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4
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1233.4
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7.9299e-08
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1.0442e-08
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2.7008e-08
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5
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1234.1
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1.2013e-09
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4.6227e-08
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1.1006e-06
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Sum X = 0.75613
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Sum Y = 0.75626
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Sum Z = 1.2217e-06
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CONCLUSION:
The vibration frequency is more at 1234 hertzhence it is adviseable to design a shaft at this frequency