- Entry date 14.07.2017 Condition monitoring for gearboxes on the HUSUM Wind 2017
- Entry date 20.01.2017 Maintenance Dortmund 2017: Predictive maintenance for gearboxes
- Entry date 26.08.2016 Maintain 2017: Predictive maintenance for gearboxes At the Maintain 2016 in Munich, the GfM again presents a wide range of products for machine diagnostics...
- Entry date 17.08.2016 WindEnergy Hamburg 2016: PeakStore512 - Offline vibration diagnosis for wind turbines At the WindEnergy Hamburg 2016 GfM presents the offline vibration diagnostics system PeakStore512 for...
- Entry date 23.08.2012 GfM put into operation condition monitoring systems at HKM
Conference Service Maintenance Operation 2018
16.05.2018 - 17.05.2018
9th VDI Conference Vibration of wind turbines
12.06.2018 - 13.06.2018
Seminar Condition Monitoring on gearboxes and roller bearings
11.09.2018 - 12.09.2018
Fair WindEnergy Hamburg
25.09.2018 - 28.09.2018
Shafts transmit torque. Sometimes it is necessary to examine these torques precisely. For example because:
- Drive elements are damaged again and again and the cause is unknown.
- Drive elements emit vibrations and noises, which can´t be explained plausibly.
- The product quality isn´t satisfactory.
- A drive produces a lot of heat.
The measurement and analysis of torque and especially the exact description of the dynamic components can provide unexpected findings. Such findings are required to understand the mechanical and the control engineering contexts. Then, the technical solution is often not far away.
The single steps of the Torque Measurement:
- gluing the strain gauges on a cleaned point on the shaft
- installing a telemetry sender, a battery and an antenna
- calibrating the measuring point
- data collection according to the defined task
- analysis of data, pictures of spectra and spectrograms, as required
- summarizing all measurement results in a report
Strain gauges were invented in 1938 in Massachusetts, USA, by Arthur Claude Ruge. The physical principle is very simple. Each electrical conductor has a electrical resistor. This resistor depends on its material and temperature and especially on the geometric dimensions:
- With increasing length of the conductor, the electrical resistance increases.
- With increasing cross section of the conductor, the electrical resistance decreases.
As long as this is done in the elastic range, it also works in reverse.
Arthur Claude Ruge glued a thin resistance wire like a meander on a thin piece of paper. He fixed the paper on a flexible bending rod. He compared the change in resistance with the actual strain and registered a good match.
Today there is a very thin conductor on a support film, for example polyimide. The conductor is mostly made of constantan. This has a high thermal stability.
In the picture a strain gauges pair was applied on a transmission shaft.