MAE 415 HW2 Sol

MAE 415 HW2 Sol - chart and flat bearing results 2 Fluid = SAE 30 oil at 65 C Shaft speed = 3000 rpm Shaft diameter = 50 mm Bearing length = 55 mm

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HW#2 Bearing Design Name____________________ Friction coefficient a. Minimum film thickness (μm) b. Location of min. film thickness c. Maximum pressure (Pa) d. Location of max pressure and terminating position of film. e. Friction torque (N m) f. Sketch the geometry of the pressure on the bearing g. 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. 1. 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). a. 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. b. 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
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Unformatted text preview: chart and flat bearing results. 2. 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 90° pressure range a) 180° pressure range b) Load capacity, N Torque, N m HW 2 Sunday, August 29, 2010 8:55 PM homework Page 1 homework Page 2 viscosity 2.20E-02 Pa s 65C speed 3000 rpm radius 25 mm h1 0.175 mm c h2 0.025 mm L 78.539816 50%,mm Length 55 mm surf speed 7.8539816 m/s slope 0.0019099 load/m 126738.46 N/m load 6970.6151 N drag/m-297.0755 N/m drag-16.33915 N torque-0.408479 N m viscosity 2.20E-02 Pa s 65C speed 3000 rpm radius 25 mm h1 0.1 mm c h2 0.025 mm L 39.269908 25%,mm Length 55 mm surf speed 7.8539816 m/s slope 0.0019099 load/m 52949.366 N/m load 2912.2151 N drag/m-175.9829 N/m drag-9.679058 N torque-0.241976 N m Pressure over 50% of bearing Pressure over 25% of bearing homework Page 3...
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This note was uploaded on 09/08/2010 for the course MAE 415 taught by Professor Eischen during the Spring '07 term at N.C. State.

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MAE 415 HW2 Sol - chart and flat bearing results 2 Fluid = SAE 30 oil at 65 C Shaft speed = 3000 rpm Shaft diameter = 50 mm Bearing length = 55 mm

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