Empirical Method for Determining the Mass Moment of Inertia of a Body Segment


Much of the anthropometric data is determined from studies performed on cadavers. To calculate the mass moment of inertia of a frozen body segment, hang from a pivot so that it is free to swing.



J - Mass moment of inertia of segment

a - Angle between vertical and centerline of segment

m - Mass of segment

L - Length of segment

g - Gravity

T - Kinetic energy

V - Potential energy

L - Lagrangian

t - Time

f - Frequency of the swinging segment (in Hertz)


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Support for the development of this module was provided by the National Science Foundation and The Cooper Union for the Advancement of Science and Art.

Please send questions or comments to Professor Ron Adrezin or Professor Daniel Raichel.