Main rotor inertia to rotation axis misalignment measurement - using vector addition of weighted static and dynamic imbalances and with weight adjusted electrically, hydraulically or pneumatically

摘要

The method is for determining the displacement of the main axis of inertia of a rotor, esp. a crankshaft, w.r.t. its rotation axis involves measuring deflections or bearing reaction forces of the rotor which is mounted so as to be able to vibrate in two planes. The method enables displacement measurements to be made at one or several optional points along the axis. The vectorially determined measurement values, consisting of static and loaded pairs of imbalance components, are amplified with different adjustable gains, vectorially recombined and fed to an indicator unit. The vectoral addition is performed w.r.t. predetermined planes along the rotor axis. For crankshafts, the measurements are taken at the extreme journal ends. The adjustable gains are set using known static and force pair imbalances.