Study On Motion Response Of A Mobile Offshore Base

A Mobile Offshore Base(MOB) is a multi-purpose logistics base, which can be stationed in coastal or international waters. It consists of multiple self-propelled semi-submersible modules interconnected on the order of 2000 meters long by 150 meters wide. It allows for conventional takeoff and landing operations of cargo transporters and helicopters at sea, cargo transfer to ships and large volume of military logistics, more than that, it can also be used as a base of ocean research, the technology which used in MOB constructing can also be used in some other very large floating structures.Different from some other conventional offshore floating structures, a MOB is kilometers in length, which is the largest offshore floating structure in human history. Both the specialized functions and long length of a MOB platform make it unique compared to any floating structure ever built. Because of deformation of structure, the load will be very large. So it must be moduled and connected by connectors. It makes the study on motion response become very important.Based on the model of Rigid-Module-Flexible-Connectors(RMFC), the method of the motion response of RMFC model is deduced by combination the multi-rigid-body theory with 3 dimensional potential theory. The program of dynamic response of the modules also based on this. Study on the response of the modules in given connector stiffness and different wave angles. To verify the accuracy of the numerical method, compared the calculation results with the model test. The experimental results agree well with the numerical ones, verifying the effectiveness of the calculation method of RMFC model and calculation program developed by author.