whirling apparatus

8/13/2019 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.

whirling apparatus

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