Leading Vibration Solution
ISFD technology provides highly engineered damping and stiffness to shift critical speeds and increase the dynamic stability of the rotor/bearing system.
In the patented ISFD design, stiffness and damping are independent of each other and can be precisely controlled. This produces higher and more accurate damping capability than a conventional squeeze film damper and makes ISFD technology a leading solution for controlling vibrations.
Stiffness and damping are each optimized for the application through rigorous rotordynamic analysis.
Shift Critical Speeds, Reduce Amplification Factor
ISFD technology can shift critical speeds and significantly reduce the amplification factor. With the reduction in amplification factor, machine seal clearances can be tightened to reduce gas or steam leakage.
Decrease Unbalance Sensitivity
ISFD technology helps reduce the sensitivity to unbalance, protecting impellers and seals from rubbing and increasing maintenance intervals.
The ISFD design, manufactured through electrical discharge machining (EDM), can integrate the bearing and damper into one unit for a space-saving solution suitable for new and retrofit installations. ISFD technology can be used with tilt pad, Flexure Pivot® tilt pad, fixed profile or rolling element bearings.
- Precise stiffness and damping
- Drop-in replacement without modifications to housing
- Shaft-centering ability
- Split configuration availability
- Constant stiffness and damping over a wide range
- No cavitation
- Suitable for use in tilt pad bearings, fixed profile bearings and rolling element bearings
The Role of Damping
Damping decreases vibrations by removing energy through resistance to motion. For rotating equipment, damping is necessary to control vibrations and prevent them from damaging the rotor, bearings or other components in the machine.
Related Case Studies
Optimized Bearings and Dampers Provide Long-term Solution to Vibrations
Over a 13-year span, a major South American oil company’s maintenance department fought recurring high vibrations in three gas reinjection compressor trains. A thorough analysis of the compressors and an inspection of damaged components pointed to a two-part solution.
ISFD Technology Eliminates Subsynchronous Vibrations
For a power generation customer in Scandinavia, Doosan Škoda Power engineered a 46 MW steam turbine as part of a combined cycle system. When high subsynchronous vibrations forced a trip in turbine operation at just 27 MW versus the rated 46 MW, the ISFD design provided rotordynamic stability needed to achieve full power output.