10 41. The hydrofioil boat has an A-36 steel propeller shaftthat is 30 m long, It is connected to an in-line diesel enginethat delivers a maximum power of 2000 kW and causes theshaft to rotate at 1700 rpm. If the outer diameter of theshaft is 200 mm and the wall thickness is 10 mm, determinethe maximum shear stress developed in the shaft. Also, whatis the "wind up," ar angle af twist in the shaft at full power?Co0000000

Given, Length of Shaft (L) = 30 m Power (P)= 2000 kW No. of rotations of shaft = 1700 rpm Outer…

Answered: 10 41. The hydrofioil boat has an A-36…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Q3.An electric motor is connected to a turbine with the help of a hollow shaft. The hollow shaft has an internal diameter that is 23% of its external diameter and transmits 550 kW power at 130 r.p.m. Determine the minimum external diameter of the shaft if the shear stress is not to exceed 5700 and the twist in a length of 1.6 m should not exceed 1.5 degrees. N Cm² Assume maximum torque = 1.2 mean torque and modulus of rigidity N 7.5 × 106 ². (4.0 Marks) cm² Rotation Turbine
Question 3 A hollow shaft for marine applications has outer and inner diameters of 400 mm and 200 mm respectively and transmits 8000 kW at 100 r/min. 3.1 Calculate the maximum shear stress in the hollow shaft. /4/ 3.2 Calculate the shear stress on the inner surface of the hollow shaft. /2/ an 3.3 Determine the maximum length of this shaft if the maximum shear stress as well angle of twist of 30 is not to be exceeded. (G = 80 GPa) /3/ 3.4 If this shaft is connected to a similar shaft, 1 m long, through a 10-bolt rigid flange coupling, determine the minimum standard bolt diameter if the pitch circle diameter of the coupling is pcd = 450 mm and the allowable shear stress in the bolts should not exceed 55 MPa. /3/ 3.5 Determine the equivalent torsional stiffness of the shaft assembly. /3/ [15]
Q4. Determine the diameter of a shaft which is transmitting 60KW at 200rev/min, for: 1- Solid shaft 2- Hollow shaft with a diameter ratio of 0.6 If the maximum shear stress in shaft is 70MN/m' and angle of twist to 3.8" in length of 4m. Take for the shaft material C=80GN/m'.
A turbine’s propeller shaft transmits 7.5 kW at the speed of 240 rev/min. The shaft hasan internal diameter of 150 mm. Calculate the minimum permissible external diameter ifthe shearing stress in the shaft is to be limited to 150 MPa
.
A belt pulley is fastened to a 7.46125 shaft, running at 200 rpm, by means of a key 19.05mm wideand 12.7cm long. The permissible stresses in the key are 55.1 Mpa in shear and 96.5 Mpa incompression. Determine the power to be transmitted and required depth of the key
The drive shaft for a truck (outer diameter 60 mm and inner diameter 40 mm) is running at 43 Hz. If the shaft transmits 156 kW, what is the maximum shear stress in the shaft in MPa?
Determine the absolute maximum shear stress in the shaft of Problem
Solve it
A motor delivers 500hp to the tubular shaft, which has an outer diameter of 2 in. The shaft is rotating at 150 rad/s. 1 hp = 550 ft⋅lb/s. A) Determine its largest inner diameter if the allowable shear stress for the material is τallow= 25 ksi.
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A drilling riser is used to drill a 4km deep hole into the seabed. The riser can be approximated as a hollow steel shaft of 185mm and 160mm outer and inner diameter respectively. If the power exerted is 230kW and the speed of rotation of the drill is 75RPM, calculate the maximum shear stress in the shaft and the twist of one end relative to the other in degrees.(Note the angle of twist of a 4km drill string is going to be >> 360o ) G = 89 kN/mm2

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