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, Wind Turbines under excessive stress can be identified immediately and countermeasures can be initiated.
In addition, 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 accurately 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. During the entire service life, the stored and directly evaluated data provides exact information about the consumed lifetime.
The SHM.Tower sensors and electronic components 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. Furthermore, the system can also be retrofitted on existing turbines.
The required customer’s properties for the SHM.TOWER were as follows:
- Embedded high resolution accelerometer
- Possibility to connect an external sensor
- Local alerting using isolated digital outputs
- Embedded lightning protections for use in LPZ2
- Remote access through the internet (TCP/IP, FTP)
- Low noise, high resolution
- Low power, fanless operation
- Autonomy and storage capacity for 3 months
- Time-stamped acquisition
- Compact and rugged design
- -40°C to +75°C operating temperature range