A high speed turbine rotates at 220HZ and drives, by means of helical gears, a 250kW generator at 50HZ (Fig Q2). The main shaft (AB) and the driveshaft (CD) are made of steel having a Young's Modulus of 208GPA, an allowable yield strength of 120MPA and Poisson ratio of 0.3. The driveshaft distance L = 0.8m. [Assumptions: No friction losses, no bending in shafts and no shock loading occurs] Tubiae Main shaft Gor boa Generakor Driveshaft Coupling Fig Q2 Determine, assuming a safety factor of 1.2: (a) the minimum diameters of the main and drive shafts respectively, ensuring that the angle of twist of the driveshaft cannot exceed 3 degrees: (b) the minimum number of M8 bolts required for the coupling on the driveshaft, if a clearance of 2x M8 bolt diameters is specified between the shaft and bolt hole edge. (c) what design improvement could be made to the coupling referred to in (b) to reduce the number of M8 bolts to 5.

A high speed turbine rotates at 220HZ and drives, by means of helical gears, a 250kW generator at 50HZ (Fig Q2). The main shaft (AB) and the driveshaft (CD) are made of steel having a Young's Modulus of 208GPA, an allowable yield strength of 120MPA and Poisson ratio of 0.3. The driveshaft distance L = 0.8m. [Assumptions: No friction losses, no bending in shafts and no shock loading occurs] Tubiae Main shaft Gor boa Generakor Driveshaft Coupling Fig Q2 Determine, assuming a safety factor of 1.2: (a) the minimum diameters of the main and drive shafts respectively, ensuring that the angle of twist of the driveshaft cannot exceed 3 degrees: (b) the minimum number of M8 bolts required for the coupling on the driveshaft, if a clearance of 2x M8 bolt diameters is specified between the shaft and bolt hole edge. (c) what design improvement could be made to the coupling referred to in (b) to reduce the number of M8 bolts to 5.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Power Transmission Elements

It is defined as the energy transfer from one location to another location. The energy will start moving from the energy generation source to the energy applied position to obtain the work output. From this method, a large amount of electric energy moves from the power station to various electrical substations.

Question

A high speed turbine rotates at 220HZ and drives, by means of helical gears, a
250kW generator at 50HZ (Fig Q2). The main shaft (AB) and the driveshaft
(CD) are made of steel having a Young's Modulus of 208GPA, an allowable
yield strength of 120MPA and Poisson ratio of 0.3. The driveshaft distance L =
0.8m. [Assumptions: No friction losses, no bending in shafts and no shock
loading occurs]
Turbine
Main
shaft
Geor box
Generalor
Driveshal
Coupling
Fig Q2
Determine, assuming a safety factor of 1.2:
(a) the minimum diameters of the main and drive shafts respectively, ensuring
that the angle of twist of the driveshaft cannot exceed 3 degrees:
(b) the minimum number of M8 bolts required for the coupling on the
driveshaft, if a clearance of 2x M8 bolt diameters is specified between the
shaft and bolt hole edge.
(c) what design improvement could be made to the coupling referred to in (b)
to reduce the number of M8 bolts to 5.

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