DH 2 - DH 13

High Speed Balancing and Ove speed Test Facility

For more than 40 years Schenck RoTec has been engaged in the development and design of special high-speed balancing machines for heavy turbine and generator rotors as well as for high-speed compressors of steam and gas turbines.

Constant exchange of experience between Schenck RoTec and renowned manufacturers of electrical and turbo machinery have lead to the development of the special DH bearing pedestals for balancing machines. These are equipped with isotropically supported bearings, providing equal stiffness in all bearing plane radial directions, and are suitable for use at extremely high balancing and test speeds.

Oil supply, vacuum and monitoring systems

To operate a high-speed balancing facility, a number of auxiliary systems are required, such as:

  • Oil supply systems for oil supply to the rotor bearings, the turbo gear and the intermediate shaft of the drive train;
  • Vacuum units for evacuation of the overspeed chamber;
  • Emergency oil supply.

Measuring systems

Today the balancing of flexible rotors can be performed with the help of our new measuring system CABFLEX++ Windows NT based. This new measuring system has been designed to process multi-channel frequency selective measuring values very quickly and efficiently. In addition to the correction weights calculated on the basis of the influence coefficient method, we offer different evaluations, like Bode and Nyquist diagrams. Further software options are: shaft orbit, shop verification, runout profile, vibration analysis package, bending line and prognosis. Network compatibility and the possibility to graph the rotor bending line near to natural frequency makes our software package complete.

For the measuring of the shaft vibration, no-contact sensors are used to analyze the rotor behavior in the sleeve bearings, in addition to the moving-coil sensors for unbalance measurement. In addition it is also possible to calculate exactly the extent of rotor deflections at relevant points, such as overhanging parts of the shaft or in the center of the rotor.

Facility planning and design

Schenck RoTec is also able to provide the overall planning of the complete facility and supply parts which do not specifically belong to our product range, for instance, electrical drive unit, turbo gear, oil supply or vacuum systems. We are therefore in a position to deliver the complete mechanical engineering of a balancing and overspeed test facility from a single source. For the civil engineering and the vacuum-tight steel liners we are able to offer the complete engineering at extremely reasonable cost.