A large amount of supplies, such as food, water, fuel, etc., were necessary in the development of oil and gas resources in the deep sea. Due to the long distances away from the land, the economic and efficiency of transportation were very low. Therefore, large-scale support platforms served for the development of oil and gas resources were designed to meet the comprehensive functions of living, medical security, supplies transferring, storage and replenishment. In this paper, the structural safety of the oil and gas resources development support platform had been successfully and efficiently evaluated by hydroelastic analysis during the design phase.
Nowadays, while evaluating the motions and responses of floating bodies such as the commercial ships and ocean structures in waves, the most widely method used was the three-dimensional (3D) potential flow theory. On the one hand, it had an efficient solution speed and accuracy that can be accepted by engineering applications. On the other hand, the theory of two-dimensional (2D) and the 3D potential flow could not only be suitable for the thin-ship analysis, but also be fully available for fat-ship and marine engineering structures such as oil and gas resources development support platform.
The general 3D potential flow theory assumes that the floating body was a rigid body, and the actual floating body was mostly a steel floating body, which belongs to the elastic structures. In the above assumption, Wu (1984) and Price (1985) proposed a generalised fluidstructure interface condition, and considered the floating body as an elastic body based on the 3D potential flow theory. According to the modal superposition method, the interaction with inertial force, hydrodynamic force and elastic force was studied. A 3D linear hydroelastic theory for the analysis of the dynamic response of any 3D deformable body traveling in waves or under water subjected to internal and external excitation was formed, which more accurately considers the relationship between fluid and floating structure.