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 11
G.11 Compute radius of gyration for a thin circular annular plate of 1000 mm outer diameter and 900 mm inner diameter with respect to its centerline z-axis.
Polar moment of inertia of annular plate I zm = (1/2) π(r 2 4 – r 1 4 )
I zm = 0.5 * π * (0.5 4 – 0.45 4 )= 0.0337 m 2
Radius of gyration R zm = (I zm /Area) 0.5 = 0.475 m
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