The Torsional Oscillations Unit, "MOT", is intended for easy experiments. It enables to illustrate and investigate the torsional oscillation in single rotor, multi-rotor and geared systems. The unit basically consists of a rigid frame that have some fasteners which enable to situate its different elements. It also has a set of helicoidal springs to simulate long flexible shafts, and a set of discs of varying mass and moments of inertia. Suitable gears of various sizes are provided too to change the gear ratio. Fasteners offer the possibility to modify the arrangement of discs and gears, as well as the use of different types of springs. That enables the study of the different existing systems. Frequency of oscillations is low, that makes a visual count possible. Besides, a line axially drawn on the spring serves to illustrate the elastic line (shape taken by the shaft when being deformed by the torque) and facilitates the experimental location of the nodes.
- Single rotor connected to the free end of a torsionally flexible member.
- Single rotor connected to the free end of a series of flexible torsional members.
- Two rotors connected to the free ends of a flexible torsional member.
- Two rotors connected to the free ends of a series of flexible torsional members.
- Three rotors connected by two flexible torsional members.
- Two rotors joined to the free end of two flexible members which are connected throug gears whose inertia is appreciable.