21_ch 17 Mechanical Design budynas_SM_ch17

21_ch 17 Mechanical Design budynas_SM_ch17 -...

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440 Solutions Manual • Instructor’s Solution Manual to Accompany Mechanical Engineering Design The pitch diameter of the flywheel is D P 2 δ = D D P = D + 2 δ = 60 + 2(0 . 716) = 61 . 43 in We could make a table: Diametral Section Growth ABCDE 2 δ 1 . 3 π 1 . 8 π 2 . 9 π 3 . 3 π 4 . 5 π The velocity ratio for the D-section belt of Prob. 17-20 is m ± G = D + 2 δ d = 60 + 3 . 3 11 = 5 . 55 Ans . for the V-flat drive as compared to m a = 60 / 11 = 5 . 455 for the VV drive. The pitch diameter of the pulley is still d = 11 in, so the new angle of wrap, θ d , is θ d = π 2 sin 1 ± D + 2 δ d 2 C ² Ans . θ D = π + 2 sin 1 ± D + 2 δ d 2 C ² Ans . Equations (17-16 a ) and (17-16 b ) are modified as follows L p = 2 C + π 2 ( D + 2 δ + d ) + ( D + δ d ) 2 4 C Ans . C p = 0 . 25 ³ L p π 2 ( D + 2 δ + d ) ´ + µ ³ L p π 2 ( D + 2 δ + d ) ´ 2 2( D + 2 δ d ) 2 Ans . The changes are small, but if you are writing a computer code for a V-flat drive,
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