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13_ch 12 Mechanical Design budynas_SM_ch12

13_ch 12 Mechanical Design budynas_SM_ch12 - c min See if...

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316 Solutions Manual Instructor’s Solution Manual to Accompany Mechanical Engineering Design Trial #1 : Choose a value of T f . Find the corresponding viscosity. Find the Sommerfeld number. • Find f r / c , then H gen = 2545 1050 W N c f r c • Find Q / ( rcNl ) and Q s / Q . From Eq. (12-15) T = 0 . 103 P ( f r / c ) (1 0 . 5 Q s / Q )[ Q / ( rcN j l )] H loss = ¯ h CR A ( T f T ) 1 + α • Display T f , S , H gen , H loss Trial #2 : Choose another T f , repeating above drill. Trial #3 : Plot the results of the first two trials. Choose ( T f ) 3 from plot. Repeat the drill. Plot the results of Trial #3 on the above graph. If you are not within 0.1°F, iterate again. Otherwise, stop, and find all the properties of the bearing for the first clearance,
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Unformatted text preview: c min . See if Trumpler conditions are satisfied, and if so, analyze ¯ c and c max . The bearing ensemble in the current problem statement meets Trumpler’s criteria (for n d = 2). This adequacy assessment protocol can be used as a design tool by giving the students additional possible bushing sizes. b (in) t b (in) 2.254 0.004 2.004 0.004 1.753 0.003 Otherwise, the design option includes reducing l / d to save on the cost of journal machin-ing and vender-supplied bushings. H H gen H loss , linear with T f ( T f ) 1 ( T f ) 3 ( T f ) 2 T f...
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