There is an aging fleet of platforms in the Cook Inlet. It is difficult to perform sub-sea inspections due to the site environmental conditions. As an alternative to sub-sea inspections, vibration monitoring can be used to determine structural damage. Through vibration monitoring, the platforms natural frequencies are established and compared against previously established values. A shift in natural frequencies can be indicative of potential structural damage.
Using ideal ice conditions and vibration monitoring instrumentation, our team collected data to determine the natural frequency of various platform structures. Natural frequencies for both North-South and East-West directions were determined, compared against previously measured values, and documented to be used for comparison purposes in future inspections.