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 15
G.15 A flywheel was assembled by welding 4 slender spokes to a short hollow thick-walled cylinder. The outer diameter of the cylinder is 1000 mm and the inner diameter 900 mm. Compute the weight moment of inertia WR 2 of the flywheel neglecting the effect of axle and spokes assembly.
Weight moment of inertia WR 2 of flywheel is the polar weight moment of inertia of the cylinder, neglecting the contribution from other components.
I zw = I zw(cylinder)
I zw = W cylinder * (1/2) (r 2 2 + r 1 2 )
W cylinder = 3425.535 N, r 1 = 0.5m, r 2 = 0.45m
I zw = 775.027 N-m 2
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