03-02ChapGere.0018

# 03-02ChapGere.0018 - C f AC 5 f AB 1 f BC 5 1.5070 d 4 f BC...

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Solution 3.7-9 Motor-driven shaft SECTION 3.7 Transmission of Power 221 C B A L 1 L 2 275 hp 125 hp 150 hp L 1 5 6ft L 2 5 4ft d 5 diameter n 5 1000 rpm t allow 5 7500 psi T ORQUES ACTING ON THE SHAFT F REE - BODY DIAGRAM T A 5 17,332 lb-in. T C 5 9454 lb-in. d 5 diameter T B 5 7878 lb-in. I NTERNAL TORQUES T AB 5 17,332 lb-in. T BC 5 9454 lb-in. At point C : T C 5 150 275 T A 5 9454 lb-in. At point B : T B 5 125 275 T A 5 7878 lb-in. 5 17,332 lb-in. 5 1444 lb-ft At point A : T A 5 33,000(275 hp) 2 p (1000 rpm) T 5 33,000 H 2 p n H 5 2 p nT 33,000 Ê H 5 hp Ê n 5 rpm T 5 lb-ft G 5 11.5 3 10 6 psi ( f AC ) allow 5 1.5 85 0.02618 rad D IAMETER BASED UPON ALLOWABLE SHEAR STRESS The larger torque occurs in segment AB D IAMETER BASED UPON ALLOWABLE ANGLE OF TWIST Segment AB : Segment BC : ( f AC ) allow 5 0.02618 rad Angle of twist governs d 5 2.75 in. Ê 0.02618 5 1.5070 d 4 and d 5 2.75 in. From A to
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Unformatted text preview: C : f AC 5 f AB 1 f BC 5 1.5070 d 4 f BC 5 0.4018 d 4 5 32(9450 lb-in.)(4 ft)(12 in. / ft) p (11.5 3 10 6 psi) d 4 f BC 5 32 T BC L BC p Gd 4 f AB 5 1.1052 d 4 5 32(17,330 lb-in.)(6 ft)(12 in. / ft) p (11.5 3 10 6 psi) d 4 f AB 5 32 T AB L AB p Gd 4 I P 5 p d 4 32 Ê f 5 TL GI P 5 32 TL p Gd 4 d 5 2.27 in. 5 16(17,332 lb-in.) p (7500 psi) 5 11.77 in. 3 t max 5 16 T AB p d 3 Ê d 3 5 16 T AB p t allow C B A 6 ft 4 ft T A = 17,332 lb-in. T C = 9454 lb-in. T B = 7878 lb-in. A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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