Name: Sam Xiang R Chang Email: Send Gender: Male Hometown: Brooklyn, NY Major: Applied Mathematics and Statistics School Name: Johns Hopkins University School Location: Baltimore, MD Graduation Year: 2010 When In China, Thing(s) Missed Most From USA: A Sandwich When In USA, Thing(s) Missed Most From China: Memories, all of them Mentor: Shunying Ji Graduate Student: N/A Research Abstract: The jacket launching procedure is the most critical and dramatic stage in the installation of offshore structures. Although lasting a few minutes, the outcome of a single launch sums up years of project preparation. This paper focuses on numerical simulations to determine optimal pre-launch conditions. The goal is to understand the mechanics behind the jacket launch process, and to construct launches with fairly predictable outcomes using the ideal draft length and trim angle combinations. In the past, SACS Launch FEM module has been used for launch simulation and analysis as well as physical modeling with scaled Reynolds-Froude type models. This paper discusses a numerical approach to jacket launch simulation with the MOSES time domain launch program, where motions are calculated through the balance of loads and applied forces on the jacket-barge system.