GfM Gesellschaft fuer Maschinendiagnose mbH
Condition Monitoring

Condition monitoring is in drive technology a term for a whole range of metrological and diagnostic methods for determining the damage state of the drive components. Very meaningful and therefore very common are vibration diagnostic procedures.

Going with a disease already at the first sign to the doctor, the chances of a quick cure is greatest. If you wait on the other hand, to the organism is completely weakened, you must often take a longer healing period in purchasing. For drive trains it is similar. The earlier you detect an irregularity, the greater the range of ways to prevent an unplanned plant downtime and consequential damages. The prerequisite is that one detects irregularities at an early stage.

Condition monitoring is the key to cost efficiency of production and manufacturing facilities, occupational safety and careful handling of raw material resources. Machine downtimes can be reduced to a necessary minimum. Maintenance activities can be planned. Wear reserves are better exploited.

Since 1999 we are for our clients a reliable partner and offer:

  • Online Condition Monitoring System „Peakanalyzer“
  • Monitoring Service for Online Condition Monitoring Systems
  • Offline Vibration Analysis as full service
  • Analysis service for Offline Vibration Measurements from third parties
  • Devices for Vibration Diagnosis
  • Torque Measurements
  • Visual Inspection and Video Endoscopy of gearboxes
  • Seminars Machinery Diagnostic
  • Consultation

That's new:

Video Endoscopy of Wind Turbine Gearboxes

Gearboxes of wind turbines are usually examined regularly for the presence of beginning damages. This is part of predictive maintenance and has to ensure in the first place, consequential damages and total failures, which in turn may result in significant repair and business interruption costs. But also for the transfer of risk, for example, at the end of the guarantee or warranty period, the exact determination of the technical condition is sometimes interesting.

Among the established methods for the assessment of gearboxes of wind turbines are the inspection, including the video endoscopy and the vibration diagnosis. Spur gear stages in the gearbox can be partially assessed by direct observation. Where this is not possible, particularly on the planetary stages, a video endoscope helps. With the help of a video endoscope partially also the raceways of large roller bearings are visible.

However, for reasons of efficiency, even with the video endoscope not all tooth flanks are usually appraised in detail. Normally, the evaluation of all rolling bearing raceways is technically not possible. Therefore, the vibration diagnosis is helpful in addition. The vibration signal includes inevitably information about really all raceways and contact surfaces of all gear meshes and roller bearings.

The GfM offers video endoscopy in combination with the vibration diagnosis. Vibration diagnosis is always done first. The data are evaluated immediately. The results of the vibration diagnosis are already being used for the video endoscopy. This means that during the subsequent video endoscopy it is searched for anomalies that were found in the vibration signal until it confirms or definitely can be discarded.

The combination of video endoscopy and vibration diagnostics provides the most comprehensive and reliable assessment results for WTG gearboxes.

Blade Bearing Diagnosis of Wind Turbines

Blade bearings connect the root of the rotor blades of wind turbines connected to the hub. They are subject to special loads. They carry very large alternating loads while rolling movements between the rolling elements and bearing rings is comparatively low. Often the wear of the running surfaces of blade bearings is not noticed immediately and cannot be detected by classical vibration diagnostic methods.

In practice, the state of blade bearings is determined mostly by grease samples or after dismantling. GfM has developed a method of diagnosis of slow-speed drives which also permits the evaluation of the blade bearings. The data acquisition is performed with sensors in the vicinity of the blade bearings. For the measurement, the rotor blade is rotated to the maximum possible deflection. The measurement results allow the assessment of local bearing damage on the inner ring, outer ring and rolling elements, as far as vibrations arise.

Process of Blade Bearing Diagnosis:

  • On the hub several displacement sensors and a speed sensor are applied.
  • For the measurement, the blade must be at a standstill in the 0 ° -, 120 ° - and 240 ° position are pitched at 90 °.
  • Data are collected with the PeakStore.
  • The instrumentation is mounted in the hub and remote controlled via radio. The measuring process takes about 4 hours.
  • The evaluation takes place in the office.

Where we exhibit:

BWE-Konferenz: Windkraft Service Instandhaltung Betrieb

from 16 to 17 May 2017, Hamburg

Maintenance Stuttgart 2017

from 17 to 18 May 2017, Stuttgart

38. VDI-VDEh-Forum Instandhaltung

from 21 to 22 June 2017, Salzgitter

12. VDI-Fachtagung Gleit- und Wälzlagerungen

from 27 to 28 June 2017, Schweinfurt

3. Konferenz Smart Maintenance 2017

from 12 to 13 September 2017, Stuttgart

HUSUM Wind 2017

from 12 to 15 September 2017, Husum

VDI-Fachtagung Schwingungen 2017

from 10 to 11 October 2017, Nürtingen near Stuttgart

Maintain 2017

from 24 to 25 October 2017, Munich

26. Windenergietage

from 7 to 9 November 2017, Rostock

Tagung Instandhaltung

from 5 to 6 December 2017, Nürnberg


© GfM Gesellschaft fuer Maschinendiagnose mbH