Rotational Vibrations - Torsional Analysis
Rotational vibrations in rotating components under alternating torsional loads, such as in gas turbines or in the drive shafts of combustion engines, place high demands on protection and diagnostic systems. This is exactly where the IfTA application for rotational and angular vibrations and torsion analyses comes in. We offer a combination of perfectly matched hardware and software components for high-resolution and real-time analyses in an exclusive bundle with our IfTA DynaMaster and IfTA ArgusOMDS system solutions.
The core elements of this application are the High Speed Timer AT2 and the analysis software IfTA TrendViewer. Together they enable the precise identification of dangerous rotational vibration conditions in order to guarantee safe machine operation. This increases the reliability and longevity of your system.
Extensive and high-precision angle-related evaluation of rotational and angular vibrations:
- Identify torsional and angular vibrations
- Combined software and hardware module made up of award-winning high speed timer AT2 & analysis software IfTA TrendViewer
- Flexible design and compatibility with common sensor principles
The core module of this application, the IfTA High Speed Timer AT2, provides a temporal resolution of 10ns. This corresponds to a frequency of 100 MHz and allows us to identify and analyze difficult to detect vibrations such as rotational, angular and torsional vibrations.
Flexibility & Compatibility
Facilitated and flexible design and compatibility with common sensor principles. High input impedance (e.g. photodiodes can be connected directly). Easily and quickly adjustable trigger threshold enables automatic tracking under changed measurement conditions.
Analog signals, e.g. from common distance sensors, can be fed in directly and can be resolved in the picosecond range via threshold value-defined triggers, i.e. there is no need for external processing electronics for analog incoming signals. This results in cost savings and higher signal quality.
The Application's core, the High Speed Timer AT2
The outstanding precision and versatility of the input card resulted in the award of the messtec + sensor masters (2nd place) in 2017.
At first, the High Speed Timer AT2 measures impulses with high temporal resolution (top left in the figure).
Depending on the specific configuration, this raw data can be used to calculate signals for speed, vibration angle, vibration speed or vibration acceleration, for example. Like any other input signal, these can be used for further analyses, e.g. FFT. For subsequent analysis purposes, these quantities are correlated in characteristic plots.
In the example we have chosen, the high-resolution raw data (top left) is used to calculate the vibration angle (top right). From this, for example, harmonics can be determined, in this case with a strong amplitude of the 4th order (bottom left). A Campbell plot also illustrates the results of the frequency analysis (bottom right: spectrum plotted over the rotational speed).