An automobile engine supplies power, P = 190 hp, at a rotational speed of 3600 rpm to a driveshaft. If the allowable shear stress in the driveshaft must be limited to Tallow = 4.00 ksi, determine: (a) the minimum diameter required for a solid driveshaft. (b) the maximum inside diameter permitted for a hollow driveshaft if the outside diameter is D = 2.25 in. (c) the percent savings in weight realized if the hollow shaft is used instead of the solid shaft.

An automobile engine supplies power, P = 190 hp, at a rotational speed of 3600 rpm to a driveshaft. If the allowable shear stress in the driveshaft must be limited to Tallow = 4.00 ksi, determine: (a) the minimum diameter required for a solid driveshaft. (b) the maximum inside diameter permitted for a hollow driveshaft if the outside diameter is D = 2.25 in. (c) the percent savings in weight realized if the hollow shaft is used instead of the solid shaft.

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

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An automobile engine supplies power, P = 190 hp, at a rotational speed of 3600 rpm to a driveshaft. If the allowable shear stress in the
driveshaft must be limited to Tallow = 4.00 ksi, determine:
(a) the minimum diameter required for a solid driveshaft.
(b) the maximum inside diameter permitted for a hollow driveshaft if the outside diameter is D = 2.25 in.
(c) the percent savings in weight realized if the hollow shaft is used instead of the solid shaft.
Part 1
Calculate the torque T in the driveshaft.
Answer: T = i
lb-ft.

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Step 1: Write the given data with suitable variables.

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Step 2: Determine the value of torque and diameter.

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Step 3: b-Find the mimimum diameter of the inside shaft.

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Step 4: C-Find the % weight saving.

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