Structural Health Monitoring (SHM), or Condition Monitoring System (CMS), is essential for predictive maintenance of large structures such as offshore wind turbines.
The system consists of four nodes containing a triaxial geophone and a uniaxial inclinometer. The nodes are connected with minimum-length cabling thanks to a single-string digital cable. The cable goes from the Data Acquisition Unit (DAU) to the nodes in a sequence connecting the DAU to the first node, followed by the second node, and so forth in a ”daisy-chain” concept. The sensors are directly connected to the DAU and, therefore, always synchronized.
The nodes are prepared to be bolted into a threaded connection on the inner face of the tower. For a fast and rigid connection, this could be done using a magnet together with glue. This double fastening system ensures that the nodes are kept rigidly connected, limiting disturbing movements from the signal. The system is furthermore designed so that other mounting possibilities are easily adapted. The nodes should be mounted at the same height in the tower and be evenly spaced with 90 degrees apart for optimal use.
Sigicom started as a one-person company in Tullinge, Sweden, in 1981. The company has been producing instruments for the professional measurement industry for the past four decades. Sigicom is an industry leader in developing autonomous and rugged vibration and noise monitoring solutions. In 2022, Sigicom opened a new office in Copenhagen, Denmark.