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 14
G.14 A flywheel was assembled by welding a short hallow thick-walled cylinder to a solid circular steel plate. The outer diameter of the cylinder is 1000 mm, the inner diameter 900 mm, with a length of 300 mm. The diameter of the solid steel plate is 900 mm with a thickness of 30 mm. Compute the weight moment of inertia GD 2 of the flywheel.
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 = 1460.359 N, r 1 = 0.5m, r 2 = 0.45m, r = 0.45m
I zw = 922.889 N-m 2
I zw (GD 2 ) = 376.3 kgf-m 2
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