[공학일반] Shigley 기계설계 7판 솔루션 (Shigleys Mechanical Engineering Design 7ed)

Chapter 1
Problems 1-1 through 1-4 are for student research. 1-5
Impending motion to left E

1 f A

1 f B G Fcr F
cr

D

C

Facc

Consider force F at G, reactions at B and D. Extend lines of action for fully-developed friction D E and B E to ?nd the point of concurrency at E for impending motion to the left. The critical angle is θcr . Resolve force F into components Facc and Fcr . Facc is related to mass and acceleration. Pin accelerates to left for any angle 0 < θ < θcr . When θ > θcr , no magnitude of F will move the pin.
Impending motion to right E E

1 f A d D

1 f B G Fcr C
cr

F Facc

Consider force F at G, reactions at A and C. Extend lines of action for fully-developed friction AE and C E to ?nd the point of concurrency at E for impending motion to the left. The critical angle is θcr . Resolve force F into components Facc and Fcr . Facc is related to mass and acceleration. Pin accelerates to right for any angle 0 < θ < θcr . When θ > θcr , no