输流管道流固耦合系统非线性动力学特性及动态机械失效预测与控制

The study object of this project is the fluid conveying pipe that is treated as shell model under the condition of nonspecific boundary condition and improper operating condition, which the fluid structure interaction is under discussed. By means of theoretical analysis, numerical simulation and model test, the research object include three aspects: the systematical nonlinear dynamical characteristics under the nonspecific boundary conditions; dynamic failure forecast of system under the improper conditions such as vibration, corruption and abrasion; active control of nonlinear vibration. The purpose of the project is to elucidate theoretical methods and simulation analytic techniques for studying the fluid conveying piping system, to illustrate its nonlinear dynamic characteristics, to acquire dynamic failure regularities of system under different kinds of improper conditions and the actional mechanism relative with reliability, to establish nonlinear control model for the piping system to carry out its active control. The results of this project can provide consistent theoretical basis for the active control of piping system used in engineering practice and for the dynamic failure forecast and control, can develop the higher dimensional nonlinear dynamics theory.

以非特定边界条件和非正常工况的壳模型为基础的输流管道流固耦合系统为研究对象，通过理论求解、数值仿真和模型试验，研究系统在非特定边界条件下的非线动力学特性，研究系统在振动、腐蚀和磨损等非正常条件下动态机械失效的预测和系统的非线性振动主动控制。阐明输流管道流固耦合系统壳模型在非特定边界条件下的分岔与混沌的解析方法和仿真分析方法，揭示系统的非线性动力学特性，获得系统在各种非正常条件下的动态机械失效规律，以及与可靠性的相互关联与作用机制，建立管道系统非线性控制模型，实现管道系统非线性振动主动控制。为工程实际中管道系统的主动控制、为动态机械失效的预测和控制提供坚实的理论基础，为发展高维非线性动力学的分岔和混沌理论做一些探求。

流体与管道结构耦合振动问题有着广阔的工程应用背景和重大的理论价值。我们针对输流管道流固耦合系统展开深入研究。首先，我们研究了特殊环境特殊材料输流管道流固耦合系统的动力学特性和动力稳定性，获得了一系列研究成果；其次，通过理论求解、数值仿真和模型试验，研究了含裂纹非特定边界条件输流管道流固耦合系统的动力学特性和动力稳定性，获得了这种非正常条件下的输流管道系统的动态特性；第三，研究了同时受线性弹簧和三次方非线性弹簧约束的悬臂输流管道系统的非线性振动主动控制，取得满意的控制效果。