The Dynamic Reliability Analysis And Dynamic Response Of Marine Riser

Marine oil and gas resource is abundant in our country.There are3.5millions square kilometres in sea areas under the jurisdiction of China Oil and Gas.China has found30oil and gas fileds which store about800millions oil and more than130billions cubic metres of gas.As the development of the ocean resourse of oil and gas started late and we are short of the experience and technology,but as the economic development of our country become faster,thus we need pay more attention to the ocean resourse of oil and gas.The gather of the ocean resourse depend on the oil drilling platform,and the marine riser system play an important role in the process of the gather. So the marine riser system attract more attention as its brand new form, dynamic behaviour and high technical content.Therefore,the dynamic behaviour research of the marine riser is necessary for the security of the gather of the ocean resourse in China.This article studied the computing method of sea load and earthquake load on the marine riser system detailedly. By Gram-Charlier series fitting on the marine riser system response to obtain density function probabilistic model,and analyse the dynamics reliability of the marine riser system under two different loads.The details of research are shown below.(1) Summarize the development of the ocean resourse of oil and gas in China and the dynamic behaviour research condition of the marine riser.Considering the increase of requirement of the ocean resourse of oil and gas and the importance of the marine riser system security, systematically study the necessary of the dynamic behaviour and dynamical reliability for the marine riser system.Classify the marine riser system as the position and introduce the construction and summarize the research of the dynamic behaviour and dynamical reliability for the marine riser system.(2) Introduce the linear wave, non-linear wave, the elliptical cosine theory and the solitary wave.On the basis of the theory above,get the expession of wave force on the marine riser. (3) Introduce the two methods of analysing the response of the marine riser in the earthquake.By the response spectrum method and time history response analysis method, calculate the earthquake load on the marine riser.(4) Compile the artificial generates seismic wave program,which can be uesd in any seismic intensity and any place by the sofware called Matlab.(5) Dynamics response analysis of the marine riser system under three different enviroments according to the theory of stockes wave theory.(6) By the response spectrum method and time history response analysis method,calculate the velocity, acceleration and diplacement response in different seismic intensity and places.(7) According to the response result of the marine riser system under wave load and earthquake load,use Gram-Charlier series fitting on the marine riser system response to obtain density function probabilistic model,and analyse the dynamics reliability of the marine riser system.