Abstract
When installing a subsea structure like subsea pump, booster, separator etc., the suspended structure and the installation vessel constitute a kind of pendulum system. The installation vessel’s motion becomes an exciting force to the suspended structure. The amplitude of horizontal oscillatory motion of the structure depends on not only the vessel’s motion but also the crane cable speed which means descending speed of the structure. Unlike in the case of offshore oil/gas development, the project cost is strictly limited in the case of scientific research like ocean environment monitoring. So we need to develop a more inexpensive installation method. One possible solution to make the installation cost reduced is applying active control system to the structure to suppress its oscillatory motion using thruster. In this paper, I introduce an experimental system for investigation of active control installation method including floating LBL, an underwater structure model with thrusters.
