The vibrations are induced by inhomogeneous flow fields. The accessory set induces the vibrations magnetically. Three fan rotors with differing numbers of blades can be investigated. Vibration measurements on fans and blowers play a major role in field monitoring operations. In addition to the usual signals caused by bearings and imbalance, the vibrations induced by the fan blades can be measured. A guard plate covers the rotating fans. Just as in actual practice, the fan model can also be driven directly via a flexible coupling or by the belt drive. An obliquely-mounted inertia disk is used to investigate the gyroscopic effect.
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