475final

# 475final - F=kx Dynamic deflection = (2wh/k) or (2 x H x...

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F=kx Dynamic deflection = (2wh/k) or (2 x H x static deflection) where h = drop height and w = weight Static Deflection = w/k Peak G = (2hk/w) Shock Duration = ∏√ (w/kg) g = 386.4 w = weight K1T1/A1 = K2T2/A2 if the material is the same Series: 1/k1 + 1/k2 + … + 1/kn on top of eachother Parallel: k1 + k2 + … + kn next to eachother Fn (natural frequency) = 3.13 / ( (dst)) or 1/2 ∏√ (kg/w) dst=static deflection Peak G = [A(2 fn)^2]/g A = amplitude of vibration Transmissablity: T = +or- 1/[1-(ff/fn)^2] = ap/at ff = forcing(table) frequency ap = acceletation of product at = acceleration of table Bounce Criteria: Ap > or = to 1g Tipping occurs if H > 2 x W or 2 x L Stack fn = (individual package fn) (2 / (N(N-1)) Actual f n =measured Fn(component + accelerometer) (Wa +Wc)/Wc Wa= weight of accelerometer Wc = weight of component. Determine frequency from a vibration signal: period is given in ms f = number of cycles/ period in secs To find compression level using ASTM-4169

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## This note was uploaded on 04/07/2008 for the course IT 475 taught by Professor Singh during the Fall '08 term at Cal Poly.

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475final - F=kx Dynamic deflection = (2wh/k) or (2 x H x...

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