OPTIMIZATION OF MOTIONS VERTICAL TRUSS SPAR PLATFORM WITH THE EXACT LAYOUT HEAVE PLATES USING GENETIC ALGORITHM

Truss spar platforms are the second generation of semisubmersible spar platforms for the extraction of hydrocarbon resources which are installed on deep watersof the Mexican Gulf in the New Gregorian Century. The special feature of these platforms, i.e., the small movement response of spar against environmental loads caused the very deep designing of the waterline. Knowing that the vertical movements of the platform is mostly influenced by the geometric conditions and according to the outstanding features of heave plates, this article will focus on the optimization of the platform movements with the automatic layout design of these plates.In order to define the optimization of the platform response in the vertical direction, in this study, the followings shall be done:  Optimize the template and the layout of the plates in the Truss section of the platform.  Optimize the space between the plates.  Automatic design process in order to minimize the time required for the design engineer. In 2001, through applying the nonlinear programming method and considering the environmental conditions of the sea in short-term and long-term modes and applying different spectra, Clauss dealt with optimizing various offshore structures such as ships, buoys, tension leg platforms, and semi-submerged platforms[1].The main purpose of this paper was to provide a code of genetic algorithm to minimize the responses of floating platforms in the vertical direction under the waves.