摘要
本文针对细长流固耦合作用系统,采用弹性-声学梁模型,用“质量流”作流体变量,位移体结构变量,得出了对称的有限元耦合方程,并据此进行了实例分析。再以渗漏作为管道失效的标准,根据概率断裂力学模型,考虑循环振动应力的影响,用蒙特-卡罗法对管道失效现象进行了数字模拟,给出了不同循环数和循环应力下的失效概率。
This paper consists of two parts. One is on fluid-structure coupled vibra-tional analysis of hydraulic pipeline. The other deals with piping reliability analysis.First, a finite element analysis of the frequency characteristic of a slender fluid-structure system, namely the elasto-acoustic beam is presented. An original symmetric formulation is derived with one new field in the fluid, namely the 'mass-flow', and a displacement field in the structure. The frequency characteristic of a part of hydraulic pipeline system in a certain aircraft is. analysed. Second, a piping reliability analysis for the hydraulic pipieline is presented. The analysis is based on probabilistic fracture mechanics model, and leak is defined as the only failure criterion. The influence of cyclic vibratory stresses is taken into account. The probability of the piping failure at different numbers of cycles and cyclic stresses is given as a result of numerical simulation by using Monte Carlo technique.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1992年第11期A577-A585,共9页
Acta Aeronautica et Astronautica Sinica
关键词
流固耦合
液压管道
结构可靠性
fluid-structure interaction, hydraulic pipeiline, piping reliability, probabilistic fracture mechanics
