非线性动力作用下柔性结构的疲劳失稳机理及其控制

In past three years，we deduced the nonlinear harmonic calculator for each order through the simplified platform-ice dynamic interaction research，thus obtained the infinite-ordelr normal form. And the application of high-order normal form theory simplifled the high-dimension nonlinear dynamic system；simultaneously we did a research on the local bifurcation and the global behavior of the high-dimension nonlinear dynamic system，especlal1y the internall resonance system with the freedom greater than three，through the singularity theory．Based on the above work，we calculated the dynamic response of some large-scale flexible structures like bridges and pipelines under nonlinear wind-induced and vortex-induced vibration; furthermore we did the reliability analysis of fatigue stability．At last we did some active control research of the dynamic bifurcation on some large-scale flexible structures through the numerical and model tests

为适应海上边际油田开发的需要，本项目以简易平台为对象，研究冰激、地震等非线性动力荷载作用下的结构响应：平台结构的内共振、组合共振机理及其控制方法。它将推进我国高维大型柔性结构系统非线性动力学的研究；为简易平台的可靠性设计方法及其安全性评估方法提供理论依据