Rotating machines are monitored in accordance with various standards / requirements (such as DIN ISO 10816, ISO 7919, etc.) The objective of this monitoring is to ensure the safe operation of equipment through the (early) detection of damage to the machine being monitored. Based on and in addition to these machine protection procedures, a great deal of effort is expended on technical measurement for machinery diagnostics. This begins with the placement of many sensors (shaft- and housing vibration sensors, acceleration sensors, sensors for the measurement of storage temperatures, ...) and ends with the use of special systems for the vibration-diagnostic examination of turbine generators and rotors. Through these procedures, deviations from normal operating behavior and failure of or damage to components can be detected early, and preventive maintenance measures and general maintenance are easier to plan. The operational availability of the machine is increased, and the failure of central and important operating components can thus be avoided. With the use of the right measuring technology, complete shutdowns and production losses can be averted -- especially in the energy- and process industries.
The extensive measuring, monitoring and diagnosis of simple rotors to complex shaftings
The IfTA system is the perfect monitoring and diagnostic system for the protection and vibration diagnosis of rotating machinery, shafting and drive trains. In contrast to previously available solutions, it offers:
- Monitoring via user-defined conditions and thresholds (in time and frequency domains)
- Continuous and thus complete data storage (long-term!)
- Algorithms for controlling data storage, such as, for example, the conditional storage of startup- and shutdown procedures.
- Supplementary storage of operating data transmitted by proprietary systems, i.e. recording via OPC, Profibus, Modbus, DataSocket, etc.
- Flexible evaluation of measurement data through user-definable plots
- Freely adjustable layouts that make recurrent evaluations easier and significantly faster.
- Processing of very large data sets (> 10 GB)
- Offline calculation of additional parameters
- Configurable number of tracked harmonics
Measure and Analyze Rotor Dynamics: IfTA DynaMaster
DynaMaster offers all the IfTA Systems advantages. If protection doesn’t have to be implemented, DynaMaster presents the simplest solution.
Rotor analysis and protection: IfTA OMDS
If protection is to be implemented in addition to measurement tasks, the real-time capability of IfTA OMDS is required. The system can be influenced through various output modules, for example, through intervention at impermissibly high amplitudes.
Powerful rotor-dynamic analysis software: IfTA Trend
With the help of IfTA OMDS and DynaMasters systems, it is possible to analyze the machine-dynamic performance of gas turbines, steam turbines, generators or drive trains.
The multi-functional data-analysis software IfTA Trend is used for this purpose in both cases. Intuitive operation and powerful visualization capabilities allow the speedy analysis of the following phenomena:
- Excitation caused by mechanically and thermally induced imbalances on rotating parts
- Excitement caused by rotating parts rubbing on stationary parts
- Parametric excitation caused by rotor sections with different flexural rigidities
- Magnetic force excitation caused by defects and electrical damage to generators, or influences from electrical networks
- Excitation through coupling- and alignment errors
- Bearing instability, an oscillation caused by the properties of the oil film on the bearing
- Vibrational excitation caused by shrink-fit friction
- Wave instability, a vibration caused by aerodynamic forces (excitation gap); caused by unbalanced currents in parts of the flow passage
Complex information can be represented in a simple manner using specialized plots. The following are included with the standard version:
- Bode Plot
- Nyquist Plot
- ShaftCenterLine Plot
- Orbit Plot
Example: Bode Plot
The Bode plot is a popular way to represent transfer functions. The example on the left shows the frequency response of a simple Laval rotor. Readings of the amplitude and phase (relative to a speed signal) of the first harmonic eigenmode can be taken as a function of the frequency (e.g. rotational speed in [RPM]) of the rotor.
Because the IfTA system synchronously samples and analyzes all dynamic channels in real time, a transfer function between any signals can be calculated and visualized "live".
By combining offline and online data analysis in a single program, vibration parameters from the monitored machine that are currently being measured can be compared with available and shared measurement data. In addition to the dynamic data of the rotor dynamics, slower process variables can also be displayed in the same plot. Complex scenarios can thus be analyzed more efficiently. On the hardware side, both slower data acquisition cards, as well as modules for bus connections are available for this reason.
The IfTA OMDS sets standards for the detailed and seamless analysis of the oscillation behavior of rotors.