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System for estimating fatigue damage

United States Patent

9,593,568
March 14, 2017
View the Complete Patent at the US Patent & Trademark Office
In one aspect, a system for estimating fatigue damage in a riser string is provided. The system includes a plurality of accelerometers which can be deployed along a riser string and a communications link to transmit accelerometer data from the plurality of accelerometers to one or more data processors in real time. With data from a limited number of accelerometers located at sensor locations, the system estimates an optimized current profile along the entire length of the riser including riser locations where no accelerometer is present. The optimized current profile is then used to estimate damage rates to individual riser components and to update a total accumulated damage to individual riser components. The number of sensor locations is small relative to the length of a deepwater riser string, and a riser string several miles long can be reliably monitored along its entire length by fewer than twenty sensor locations.
LeMonds; Jeffrey (Clifton Park, NY), Guzzo; Judith Ann (Niskayuna, NY), Liu; Shaopeng (Clifton Park, NY), Dani; Uttara Ashwin (Niskayuna, NY)
General Electric Company (Niskayuna, NY)
14/ 879,239
October 9, 2015
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH & DEVELOPMENT This invention was made with Government support under RPSEA contract number 11121-5402 awarded by the United States Department of Energy. The Government has certain rights in this invention.