A circumferential-groove pressure-fed bearing is lubricated with SAE grade 20 oil sup- plied at a gauge pressure of 30 psi. The journal diameter d; is 1.750 in, with a unilateral tolerance of –0.002 in. The central circumferential bushing has a diameter d, of 1.753 in, with a unilateral tolerance of +0.004 in. The l' /d ratio of the two “half-bearings" that constitute the complete pressure-fed bearing is 1/2. The journal angular speed is 3000 rev/min, or 50 rev/s, and the radial steady load is 900 lbf. The external sump is maintained at 120°F as long as the necessary heat transfer does not exceed 800 Btu/h. (a) Find the steady-state average film temperature.

A circumferential-groove pressure-fed bearing is lubricated with SAE grade 20 oil sup- plied at a gauge pressure of 30 psi. The journal diameter d; is 1.750 in, with a unilateral tolerance of –0.002 in. The central circumferential bushing has a diameter d, of 1.753 in, with a unilateral tolerance of +0.004 in. The l' /d ratio of the two “half-bearings" that constitute the complete pressure-fed bearing is 1/2. The journal angular speed is 3000 rev/min, or 50 rev/s, and the radial steady load is 900 lbf. The external sump is maintained at 120°F as long as the necessary heat transfer does not exceed 800 Btu/h. (a) Find the steady-state average film temperature.

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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