Download - WHIRLING APPARATUS
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GROUP MEMBERS:
ARSALAN ALI (REG. # 3138)
ROHAN SHAFIQ (REG. # 3125)
SARDAR ADEEL (REG. # 3145)PIEMAAN FAZILY (REG. # 3230)
MALIK UZAIR (REG. # 3168}
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OBJECTIVES
APPARATUS DESCRIPTION
CAD MODEL
PROCEDURE
GOVERNING PRINCIPLE APPLICATIONS
LOSSES
FLAWS
RECOMMENDATIONS
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To understand the whirling of shaftapparatus and its procedure
To understand the governing principle
To find losses and flaws in apparatus andgive recommendations
Cad model of apparatus
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THE WHIRLING OF SHAFT: Transverse oscillations of shaft with natural
frequency of external forcing system.
This is very damaging effect and the system mustbe carefully balanced to reduce this effect.
Critical Speed:
The speed at which the shaft fails due to fatigueloading is called Critical Speed.
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Base frame Speed Motor
Removable Safety Guard with Magnet
Inductive Speed Sensor Two End Bearings
Self aligning Bearing
Movable nylon Bushes
Test Shaft
Stroboscope
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The centrifugal force provided by the motor
balances by the elastic force of shaft.
The whirling of shaft is caused by
phenomenon of vibration and bending.
THE ON EPT:As the governing principle suggest thecentrifugal force provided by the motorbalances by the elastic force of shaft.
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Fc = F e
2( + )=kA = /
2 = 0
=
M = mass r = Radius w = Angular Velocity K = Elastic Constant A = Whirling Amplitude
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GENERAL:For any given shaft made by any specificmaterial this apparatus can calculate thecritical speed and natural frequency.
PRACTICAL:Can be use to find the whirling of
Car wheel Axis
Turbine shaft
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The apparatus is efficient involving manymajor and minor losses.
Electrical losses in DC motor
Sound energy loss
Frictional loss at bearings and bushing
Heat losses
Vibrational losses
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The apparatus can only calculate whirl ofsimply supported shafts.
It cant measure higher order harmonicfrequencies.
It is not suitable for very large and very smallshafts. As for very small shafts whirling willbe small and precise instrument is required.
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To measure the whirl of shafts of otherconfiguration the apparatus should havemoveable bushing.
It should be able to measure the higher order
harmonic frequencies. It should have the capability to measure the
whirl of short length shafts.
It should also able to measure vibrations with
whirling.
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Yes, this apparatus is inline with Mom andVibrations lab course.
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It is not a good apparatus to take it as a FYP.