Method to determine inertia in a shaft system
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United States of America Patent
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Sep 6, 2016
Grant Date -
Apr 28, 2016
app pub date -
Sep 30, 2015
filing date -
Oct 22, 2014
priority date (Note) -
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Abstract
A method to determine inertia of components of a rotating shaft system. The shaft system includes a shaft coupling a turbine to drive the rotation and a load to be driven by the rotation. The method includes steps to: apply a feedback to a forcing input to the shaft system; measure resonant frequency of the shaft; iterate steps 1.a) and 1.b) for different feedbacks; plot resonant frequency squared against gain; and determine inverse of gradient from the plot to give inertia of the turbine. Also a method to determine shaft stiffness using the inertia of the turbine.
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