Random Wave Load Of Offshore Structures, Rapid Dynamic Response Calculation Method And Experimental Research

With the shortage of land resources, the development and utilization of Marine resources get wide attention around the world. The wind and oil and gas resources is the main Marine resources developed. Offshore structures is the foundation of the development and utilization of Marine resources, and random wave load calculation and structure dynamic dynamic response analysis rare important parts of structure design. On the one hand, mono pile structure is the simplest and most common foundation of offshore wind turbine. The existing commercial software can calculate the total random wave force acting on the foundation structure, but it is hard to get the wave load of each location. On the other hand, the utilization of marine resources develope from low water to deeper waters continuously, offshore structures become more and more complicated. It has always been the hot spot of research to solve structure dynamic analysis rapidly. Condensation of degrees of freedom is a method reducing the order of structure effectively, but it tends to lead to deviation. However, that has not yet been researched by scholars how much difference between condensation structure and original structure and which factor is the most affecting factor.In this paper, the program is written to calculate the random wave load of mono pile structure of unit length based on random wave theory and relevant standard. The author also validated the program Compared with result commercial software calculated and Experimental tested.For the vibration characteristics and dynamic response of the complex structure, the author wrote the program to calculate vibration characteristics and dynamic response of structures and validated it by comparing to the result the commercial software ANSYS calculated that base on a jacket offshore wind turbine. Then, the author calculated the natural frequencies of the structure by using the modal synthesis method and compared it with the result of original structure. Last, the author done condensation of degrees of freedom to offshore wind turbine by the static and dynamic condensation, study the different of dynamic response in different condition between new and original structure, and analyses the different of the structures condensed with different method. Considering the characteristics of condensation structure related to many factors, the author has researched the affecting of the master degrees and the number of master degrees.In this paper, the author wrote the program to calculate the random wave load on mono pile structures with reasonable method and discuss the vibration characteristics and dynamic response rapid solving method, research the influence of various factors such as different method, different number of master degrees, different master degrees, and obtained a systematic and meaningful conclusion.