APPENDIX G – Pumps and Turbines
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Surge Analysis and the Wave Plan Method
Supplementary Material: Example Problems and Solutions
Appendix G – Problem 16
G.16 An object was assembled by welding a short (300 mm length) hollow thick-walled steel cylinder to a solid circular steel plate. The outer diameter of the cylinder is 1000 mm and the inner diameter 900 mm. The diameter of the solid steel plate is 1200 mm with a thickness of 30 mm. Compute the weight moment of inertia WR 2 of the object with respect to z-axis.
Weight moment of inertia WR 2 of flywheel is the sum of polar weight moment of inertias of the cylinder and the plate.
I zw = I zw(cylinder) + I zw(plate)
I zw = W cylinder * (1/2) (r 2 2 + r 1 2 ) + W plate * (1/2) (r 2 )
W cylinder = 3425.535 N, W plate = 2596.195 N, r 1 = 0.5m, r 2 = 0.45m, r = 0.6m
I zw = 1242.342 N-m 2
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