SCHOOL OF ENGINEERING, RMIT UNIVERSITY
Whirling of shaft
s3610448
Ziqi Song
8/27/20181 | P a g e
Table of Contents
Page
Table of Contents ---------------------------------------------------------------------------
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SCHOOL OF ENGINEERING, RMIT UNIVERSITY
Whirling of shaft
s3610448
Ziqi Song
8/27/20181 | P a g e
Table of Contents
Page
Table of Contents ------------------------------------------------------------------------------------------------1
1. Learning objectives ------------------------------------------------------------------------------------2
2. Related Theory------------------------------------------------------------------------------------------3
3. Materials and Equipment -----------------------------------------------------------------------------4
4. Experimental Method----------------------------------------------------------------------------------5
5. Result-------------------------------------------------------------------------------------------------------6
6. Discussions----------------------------------------------------------------------------------------------10
7. Conclusions---------------------------------------------------------------------------------------------11
8. List of References and Bibliography-------------------------------------------------------------- 122 | P a g e
1. Learning Objectives
• Using the Dunkerley’s formula to calculate the theoretical approximate values of
whirling (critical) speed of a shaft.
• Using experimental method to study the critical speed of the shaft with and
without an external mass.
• Drawing the Whirling of Shafts graph3 | P a g e
2. Related Theory
Consider a rotating horizontal shaft with a central mass(m) which has a centre of
gravity (G) slightly away from the geometric censored(O)
Calculate the theoretical values of the shaft deflection, y at various speeds,ω (below
and above the critical whirling speed, ?? ) using the equation,
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