829_Dynamics 11ed Manual

829_Dynamics 11ed Manual - Engineering Mechanics - Dynamics...

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Engineering Mechanics - Dynamics Chapter 22 where B 0.62 ft = b 0.94 rad s = ω d 11.9 rad s = φ 1.49 rad = Problem 22-58 A block of weight W is suspended from a spring having stiffness k . The support to which the spring is attached is given simple harmonic motion which may be expressed as δ = 0 sin ω t . If the damping factor is C ratio , determine the phase angle of the forced vibration. Given: W 7lb = 2 rad s = k 75 lb ft = C ratio 0.8 = 0 0.15 ft = g 32.2 ft s 2 = Solution: n kg W = n 18.57 rad s = atan 2 C ratio n 1 n 2
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