Rotor dynamics test bench

The rotor dynamics test bench is one of the most modern test benches of its kind in the world. The test rig can be used to examine the influence of the bearing type and geometry on the vibration behavior of the rotor by using different test bearings. Furthermore, the operating behavior of squeeze oil dampers can be analyzed in more detail. For this purpose, dynamic tests with variable rotor speed or static tests with constant rotor speed are carried out.

Various measuring systems are installed on the test bench to investigate the rotor and bearing behavior. The radial deflection of the rotor is recorded along its longitudinal axis on 9 (or 11) measuring planes. Measuring planes 1-7 are each equipped with two laser distance sensors for the vibration measurements. To determine the movement of the squeeze oil damper, the coincident planes "SFD" and "Bearing" are also present on the bearing. Four inductive distance sensors (QÖD and outer ring) are used on each bearing for gap measurement, which are mounted once in the bearing housing and once directly on the bearing shell. The difference between the two signals represents the movement of the squeeze oil damper. In order to determine the zero phase angle of a rotor revolution, an inductive sensor is installed on the rotor-side gear shaft.

To measure the bearing temperatures, thermocouples are glued into holes provided for this purpose in the bearings. These are mounted at a defined radial measuring distance from the center of the bore to the bearing surface and axially in the center of the bearing. In addition, the rotor temperature is measured by an infrared temperature sensor. Sensors are mounted in the squeeze oil dampers for pressure measurement.

In addition to this measurement data, the data from the hydraulics and the frequency inverter are recorded during the measurements:

• Oil supply temperature of the bearings
• Volume flow and supply pressure of the bearings
• Motor speed

Essential test bench data: