建立流固耦合管路系统数学模型的一种方法

An Approach to Mathematical Modeling of Piping System With Fluid-Structure Interaction

本文分析了流固耦合状态下复杂管系振动的特点,提出了用广义复模态理论建立结构模型和用频率相关摩擦模型建立流体模型的基本方法,引入元素组合技术在复域建立流固耦合模型,在研究结构振动引起的流体特征畸变、管系振动的监测、调节、预测以及系统故障诊断等方面,该模型具有较好的实用性。

This paper studies the dynamic characteristics of a complex piping system which contains fluid flow. A generalized complex modal decomposition method is proposed for modeling piping structure. A characteristic impedance transfer matrix of piping flow with a frequency-dependent friction is employed for describing the model of fluid flow, which is coupled to the structural model by means of an approach similar to that used in the structural modal synthesis. The coupled model is practicable for the detecting, monitoring, controlling or predicting of piping vibrations, and for the studying of fluid dynamic characteristics under the influence of structural vib-ration, also for the diagnoscating of the piping system.