| Offshore platform is the basic equipment of the exploitation of offshore oil and gas resources, and the base of the work and living at the sea . Dynamic loadings such as wind, wave , current and so on may cause platform to vibrate excessively, which makes it necessary to apply structure vibration control theories and methods in ocean engineering. It is very realistic to apply virtual prototype technology in ocean engineering in order to shorten research cycle, cut research cost and to improve research quality.Taking practial application and engineering requirement into account, the thesis investigates the control effect of a semi-active vibration absorber, variable stiffness tuned mass damper which is designed for a certain offshore platform. According to the Câ…¡ platform structure and its environment characteristics,a finite element modal isestablished. The dynamic response of the platform under irregular wave force is gained, which indicates the y direction vibration is most serious. Referring to platform structure, loads and its dynamic response, the primary parameters are designed , practical control strategy and complete control system are put forward.The effect of the controller is investigated by the joint simulation of ADAMS, ANSYS and Simulink. The results indicate that under the irregular wave force, the displacement standard deviation and the acceleration standard deviation of the top deck can be reduced by 23. 02% and 26. 51% respectively , while the displacement standard deviation of the controller's sildering support is reasonable, 0.0612 meter.The location of the controller is optimized , which provides theoretical base for the design, manufacture, debug and installation of the physical controller.
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