6. A marine turbine developing 15,000 hp and it turns the shaft at 300 rpm. The propeller which is attached to the shaft develops a thrust of 150,000 lbs. A hollow steel shaft with an outside diameter of 14 in. will be used. The maximum shearing stress based on the torsion alone is not to exceed 7.5 ksi. Find the thickness of the hollow shaft in mm.

6. A marine turbine developing 15,000 hp and it turns the shaft at 300 rpm. The propeller which is attached to the shaft develops a thrust of 150,000 lbs. A hollow steel shaft with an outside diameter of 14 in. will be used. The maximum shearing stress based on the torsion alone is not to exceed 7.5 ksi. Find the thickness of the hollow shaft in mm.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.

Question

6. A marine turbine developing 15,000 hp and it turns the shaft at 300
rpm. The propeller which is attached to the shaft develops a thrust of
150,000 lbs. A hollow steel shaft with an outside diameter of 14 in.
will be used. The maximum shearing stress based on the torsion
alone is not to exceed 7.5 ksi. Find the thickness of the hollow shaft
in mm.

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