Bi and trifilar suspension centering correction

Abstract

For accurate measurements of moments of inertia, or gyradii, about a vertical axis the offset of the center of mass of the suspended body from the symmetry axis of the suspension is required. A number of simple methods of determining this offset from yaw period measurements are described and experimentally shown to provide results of precision equal or better than suspension line tension measurements and thus eliminating the necessity for the use of strain gauges.