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Document Title
Fundamentals of Stress and Vibration Chapter Title
[A Practical guide for aspiring Designers / Analysts] 2. Engineering Mechanics
mW 2
From . & . , we have: I element = - - - - (2.43)
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The total MMOI about the ‘x-axis’ is given by the sum of equations (2.42) and (2.43):
I yy = Rotation of all elements about the y − axis
+ Rotation of all elements about their own axis
mL 2 mW 2
I = +
yy
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And, the MMOI about the ‘z-axis’ is as shown:
[Fig 2.50: inertia of element about the 'z-axis' through the CG]
mH 2
From . , we have: I zz,elem = - - - - (2.44)
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[Fig 2.51: inertia of element about its own axis] [Fig 2.52: MMOI contribution of elements across
the height (H)]
Page 60 QP No. SSC/Q4401, Version 1.0, NSQF Level 7, Compliant with Aero and Auto Industries,
