• What if towers swing?
  • What if towers swing

SHM.Tower® – Intelligent system for the monitoring of tower vibrations and for lifetime prognosis

Windfarm offshore
Windfarm offshore

Depending on the location and operating mode of a wind turbine, the vibration load especially of the tower varies greatly. The monitoring system SHM.Tower® records these loads via integrated sensors. The recorded data is evaluated directly and compared with threshold values defined in advance. Warnings can be issued if threshold values are exceeded. Thus, WTs under excessive stress can be identified immediately and countermeasures can be initiated.

In order to be able to decide on the further operation of a wind turbine after the design lifetime of 20 years, the remaining lifetime must be determined as exactly as possible. In particular, critical extreme conditions must be taken into account. With SHM.Tower, the evaluation for the further operation of your wind turbine is based on the fatigue loads that have actually occurred and thus not only on mere estimates.

Vibration monitoring system SHM.Tower
Vibration monitoring system SHM.Tower

Sensors and electronic components of SHM.Tower are installed in a compact casing for easy installation in the tower head of the wind turbine. In the energy self-sufficient operating mode, SHM.Tower can be integrated during construction and can thus bridge power failures of up to three months.

With this functionality, the lifetime consumption during installation can also be reliably and easily recorded. Furthermore, the system can also be retrofitted on existing turbines: all fatigue loads are recorded and stored at any time.

Functions

Monitoring function

  • Measurement of vibration stress and output of warnings if threshold values are exceeded (ISO 10816-21/VDI 3834)
  • Frequency distribution of RMS values (e.g. during the year)
  • Park monitoring for the detection of heavily loaded turbines

 

Lifetime prognosis

  • Lifetime prognosis for each tower segment based on fatigue strength
  • Classification of loads according to operating conditions
  • Lifetime consumption trend
  • Valid statements for the further operation of your wind turbine
  • Also for retrofitting

 

Performance

  • Energy self-sufficient monitoring function (recording up to 3 months without power supply)
  • Connection to the Wölfel monitoring portal MIC.Tower
  • Interface for external sensors (three-channel sensors, 4-20 mA)
  • Frequency range: 0.1 - 10 Hz
  • Measuring range: ± 2 g

Since comprehensive monitoring is crucial for offshore wind turbines, we work with a global structural health monitoring concept for the entire wind turbine. Thus, monitoring of the tower is usually accompanied by monitoring of the foundation with SHM.Foundation® monitoring system. This is a perfect basis for reducing the costs of recurring inspections, especially under water.

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