| Offshore platform in its service is often subject to the combined effects of the wind, the waves and the currents, which make the key structures, like the floating, mooring system and flexible structures, seriously damaged, and pose a grave threat to the production safety of the platform. So in order to guarantee the platform security, integrity and durability, we need to design a healthy monitoring system to measure the strain response of the key components of the platform. And determine the force characteristics, assess the platform's health, then achieve the purpose of early warning.Although the monitoring for the floating system and environmental elements is very difficult, the technology is mature. Both domestic and foreign have related products. However, the monitoring for the underwater part of the platform is still in early stage in our country, only a few institutions engage in this field. Several foreign companies master the key technology in this field.This paper mainly presents the research and development of the measuring devices--self-contained inclinometer and self-contained accelerometer. Based on the requirement of offshore platform monitoring, the devices completely and accurately record the anchor's inclination and riser's vibration. The two devices are developed based on the low-power-consumption 16-bit microcontroller MSP430. Laboratory calibration, platform movement simulation experiment, and real platform testing confirmed that the performance of the instrument can meet the measurement requirements. The devices have characteristics of small-size, high-precision, energy-economical, mass-storage and user-friendly. They are able to work underwater continuously for up to half a year. Compared with the foreign counterparts, the new devices are cheaper and more suitable for extensive multi-point measurement. Now they have been installed in Nan Hai Tiao Zhan FPS platform in the South China Sea for measurement of anchor chain inclination and riser vibration. |
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