Supplementary Material, Appendix G – G.14

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 GD² of the flywheel.

Solution:

Weight moment of inertia WR² 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) (r₂² + r₁²)  + W_plate * (1/2) (r²) 

W_cylinder = 3425.535 N, W_plate = 1460.359 N, r­₁ = 0.5m, r­₂ = 0.45m, r­ = 0.45m

I_zw = 922.889 N-m²

I_zw (GD²) = 376.3 kgf-m²

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