Patent ID: 6430516
Filing Date: 2002-08-06
Classification: F16C

Abstract:
A method for specifying cross-sectional dimensions of a high speed viscoelastic shaft having a circularly cylindrical cross-sectional shell, the shell having an inner radius and an outer radius, comprising the steps of:selecting the material of the shaft; determining dilational wave speed of the material as a function of frequency; determining shear wave speed of the material as a function of frequency; solving for critical frequencies of the shaft by solving a three-dimensional characteristic frequency equation for the shaft, the equation being defined by the dilational wave speed, the shear wave speed, and the inner and outer radius of the shell, the critical frequencies defining functions that depend upon physical dimensions of the inner and outer radius; and specifying the inner and outer radius of the shell by minimizing cross-over of critical frequencies over operational rotational speeds of the shaft.