本文得到了充液管道流固耦合4方程模型的一个同时含有泊松耦合和结点耦合的波动解析解。解析解的计算结果与实验结果吻合。通过划分定义区间,较成功地解决了在边界上产生两种不同波速的反射波与入射波迭加的问题。文中还提出了分段函数的一种逻辑表达方式,用它来处理分段函数的运算,显得十分简明 In this paper, a fluid-structure-coupled 4-equation model of a liquid-filled pipeline is obtained. An analytical solution of volatility containing both Poisson and node couplings is obtained. The analytical results agree well with the experimental results. By dividing and defining the interval, the problem that the reflected wave and the incident wave superimposed on the boundary generated two different wave velocities is solved successfully. The paper also proposed a logical expression of piecewise function, which is used to deal with the operation of piecewise functions, it is very concise