Li Chenfeng

Derrick Structure Design and Finite Element Analysis of CPOE-16 Jack-Up

Drilling derrick, acting as one of the most important structures in Jack-up Rig, is designed to accommodate drilling machines like top drive, utility winches and so on. According to the requirement of API Spec. 4F, the accuracy of the standard design ratings of each structure shall be tested by proof loading or a computer model such as Finite Element Analysis. Therefore, this thesis utilizes Finite Element Analysis software, ANSYS, to verify the design of derrick structure for CPOE-16 (No. 16 jack-up rig for China National Petroleum Offshore Engineering) jack-up based on API 4F [1], AISC Allowable Stress Design [2] and ABS MODU rules [3]. The permanent loads, live loads (variable functional loads), environmental loads (mainly wind loads) and dynamic loads will be included in the total derrick structure strength calculation with the purpose of verifying the security and reliability in all required conditions by rules and regulations. Furthermore, on the basis of analytical result, the authors focused on the adverse beams provide an optimization solution by improving the section of beams for reducing the distortion, and ultimately deal with the distorted problem.© 2014 ASME

Notice of Retraction Comparison of Motion Response Calculation Methods of Deepwater Semi-Submersible Platform

In order to forecast the motion response of deepwater semi-submersible platform, frequency domain linear analysis method and time domain non- linear analysis method are currently widely used. Based on the introduction of the two methods, the difference analysis of the frequency domain method and the time domain method is carried out gradually. A deepwater semi-submersible platforms motion response example is given to clarify summarize the similarities, differences and numerical discipline forecasted by the two methods separately. The research provides the reference for forecasting the motion response of the platform in kind.