Storm waves tend to be attenuated by a variety of processes as they propagate across the relatively shallow depths of the Texas and Louisiana Continental Shelves. Present shallow water wave force guidelines contained in API RP 2A were developed as a very simplified, judgment-based interpolation into water depths less than 300 feet. Shallow water design wave force levels adopted by many companies generally reflect the conservative adjustments made after many platform losses and significant damages were incurred during Hurricane Hilda in 1964. Subsequent tests of the new generation of shallow water platforms by other hurricanes indicates acceptable performance of the structures. However, costs associated with these structures, as well as results of some of the more recent studies, indicate that there may have been some degree of over-correction in the process of revising the industry's shallow water criteria after Hurricane Hilda.The purpose of this study was to develop a rational procedure for establishing environmental design conditions for platforms in relatively shallow water in the Gulf of Mexico. This paper discusses two parts of this study. The first part is that of developing and calibrating a procedure for determin the amount of storm wave height reduction due to dissipation of wave energy through fluid shear stresse acting on the seafloor of the Continental Shelves. The second part is that of developing and justifying a wave force parameterization procedure to quantify wave force levels on typical jacket structures in the Gulf of Mexico.
The thermal performance of the propeller driver system is very important for underwater vehicles. A new kind of cylindrical heat sink is designed for a certain propeller driver system. The performances of the heat sink are analyzed, mainly using numerical methods. The thermal influences of structure parameters, such as base thickness, fins length, and fin number, are studied for the heat sink with an orthogonal experimental method. The results show that all three parameters have positive impacts on the heat dissipation of the driver. Compared with the fin numbers and the fin length, the base thickness has a relatively small impact on the working temperature of the driver. Compared to the initial design, the maximum temperature of the propeller driver drops by 22.3% with the designed novel cylindrical heat sink in the studied cases.
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