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MAE 415 HW2

# MAE 415 HW2 - a The extent of the pressure is 90° In this...

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HW#2 Bearing Design Name____________________ 1. Calculate the Summerfeld No. and use the charts in the book to calculate the following parameters for the bearing described below. Compare the result to Trumpler’s criteria. a. Friction coefficient b. Minimum film thickness (μm) c. Location of min. film thickness d. Maximum pressure (Pa) e. Location of max pressure and terminating position of film. f. Friction torque (N m) g. Sketch the geometry of the pressure on the bearing 2. Now use the flat bearing approximation to find similar results to those given above for two assumptions; 90° and 180°ranges of pressure. Fill in Table 1 below and discuss the reason for any differences between chart and flat bearing results.
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Unformatted text preview: a. The extent of the pressure is 90°. In this case the pressure will start 90° upstream from the minimum film thickness. Find the load capacity and the friction torque (same as you did in HW#1). b. The extent of the pressure is 180°. In this case the pressure will start on the opposite side of the bearing from the minimum film thickness. Find the load capacity and the friction torque. Fluid = SAE 30 oil at 65 C Shaft speed = 3000 rpm Shaft diameter = 50 mm Bearing length = 55 mm c = 0.1 mm Load = 650 lbs. Complete Brg Flat Brg Approx Chart results a) 90° pressure range b) 180° pressure range Load capacity, N Torque, N m...
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