| The objective of this thesis was to modify and commission a geared rotor rig, carry out forced torsional vibration experiments and simulate the system with a finite element model.;The rotor rig is a complete machine and consists of two permanent magnet DC motors, a flywheel, a Hooke's joint, two torque sensors, four toothed disks, a load box and two shaft sections connected by a spur gearbox. One DC motor provides the necessary torque required to drive the rotor rig and the other produces a load on the rig by fulfilling the role of a DC generator. The oscillatory velocity characteristics of the Hooke's joint are utilized to obtain an oscillating torque that excites the rig's torsional vibrations.;The torsional modal parameters of the two shaft sections and the complete rig were determined both experimentally and theoretically. A special element with lower Young's modulus was employed to model the influence of the clearance in the Hooke's joint. Good agreement was achieved not only for each shaft but also for the system. (Abstract shortened by UMI.)... |
