针对高扬程泵站压力管道振动的安全隐患，提出采用附加水体质量的方法，建立基于流固耦合的泵站压力管道数值模型，并以景电灌区一期二泵站1号压力管道为例进行不同工况下的模态参数辨识，分析压力管道位移变形规律及其流激振动特点。数值模拟结果表明：压力管道最容易激发的振动变形在于4号机进水管和出水管处，高阶模态的振型要比低阶模态的振型振动幅度更大，而且随着阶次的增高，不易被激振的出水管也逐渐产生振动变形,但是，8号机进水管的开启与否对整体管道的振动影响不大。有限元的数值模拟分析结果与现场试验所测结果基本一致，表明附加水体质量模型方法计算简单，结果可靠，在泵站压力管道的流固耦合模拟应用中具有一定优势。

For the safety problems of vibration in the pressure pipeline of high-lift pumping station, the approach of added water mass was proposed. A numerical model of pressure pipeline of pumping station was developed based on the fluid-solid interaction, and the modal parameters under different working conditions were identified based on the No.1 pressure pipeline of #2 pumping station in the first stage of Jingtai irrigated area. The displacement deformation of pressure pipeline and its vibration characteristics were analyzed. The results showed that (1) the vibration deformation stimulated by the pressure pipeline occurs at the inlet and outlet pipes of #4 machine; (2) the vibration amplitude of high-order vibration mode is larger than that of low-order vibration mode, and with the increasing of order, vibration deformation can also occur in the outlet pipe which is not easily to be vibrated; and (3) the inlet pipe of #8 machine does not affect the overall pipeline vibration. The results of finite element numerical simulation analysis were similar to those obtained from in-situ measurements. Consequently, the model with added water mass is simple and provides reliable results, and it has advantages in the fluid-solid coupling simulation of pressure pipelines.

国家自然科学基金资助项目（51279064）；中国水利水电科学研究院开发研究基金项目（IWHR-SKL-201110）