Three models of the vibrating ulna

摘要: Abstract Three models were evaluated for prediction of ulnar resonant frequency given length, mineral content, and width. The ‘ulna’ was a homogeneous, isotropic cylindrical tube. For Model I, the tube attached to rigid supports by hinges. II, springs. III similar II except addition spring-mass system simulating an accelerometer strapped wrist. all 3 models, r.m.s. error ≤ 20 per cent relative measured values in 118 schoolchildren. Models nearly independent spring constant values: ± 50 changes these changed 1 cent. mass interposed skin constant: Resonant Hz over range 0–50 g 5 -5 times nominal value.