Consider a 60-cm-long journal bearing that is lubricated with oil whose viscosity is 0.1 kg/m-s at 20°C at the beginning of operation and 0.008 kg/m-s at the anticipated steady operating temperature of 80'C. The diameter of the shaft is 8 cm, and the average gap between the shaft and the journal is 0.08 cm. Determine the torque needed to overcome the bearing friction initially and during steady operation when the shaft is rotated at 1500 rpm. The torque required to overcome the bearing friction is The torque required during steady operation is N-m. N-m.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Consider a 60-cm-long journal bearing that is lubricated with oil whose viscosity is 0.1 kg/m-s at 20°C at the beginning of operation and
0.008 kg/m-s at the anticipated steady operating temperature of 80'C. The diameter of the shaft is 8 cm, and the average gap
between the shaft and the journal is 0.08 cm. Determine the torque needed to overcome the bearing friction initially and during steady
operation when the shaft is rotated at 1500 rpm.
The torque required to overcome the bearing friction is
The torque required during steady operation is
N-m.
N-m.
Transcribed Image Text:Consider a 60-cm-long journal bearing that is lubricated with oil whose viscosity is 0.1 kg/m-s at 20°C at the beginning of operation and 0.008 kg/m-s at the anticipated steady operating temperature of 80'C. The diameter of the shaft is 8 cm, and the average gap between the shaft and the journal is 0.08 cm. Determine the torque needed to overcome the bearing friction initially and during steady operation when the shaft is rotated at 1500 rpm. The torque required to overcome the bearing friction is The torque required during steady operation is N-m. N-m.
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