TURBOGENERATOR TORSIONAL MECHANICAL MODAL PARAMETER-IDENTIFICATION FROM ONLINE MEASUREMENTS

A method for measuring the torsional mode parameters of a turbogenerat or is investigated. The advantages of this measurement technique are t hat it enables the direct measurement of the mode inertia (a parameter hitherto largely neglected). In addition it enables the determination of the mechanical damping (excluding the electrical effects) while th e turbogenerator is synchronized. The process involves the measurement of the generator's electrical torque and shaft speed. Results from di gital computer simulations are presented as evidence that the method i s successful. The method is then used to identify specific torsional m ode parameters of a laboratory multi-inertia micro-alternator.