基于流固耦合的液压振动桩锤管系减振研究  

Vibration control on pipeline system of hydraulic vibratory pile hammer

作　　者：罗春雷[1] 刘芳华[1] 范增辉[1] 张宜[1] 宋长春[1] 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2014年第6期1797-1803,共7页Journal of Central South University:Science and Technology

基　　金：国家高技术研究发展计划("863"计划)项目(SS2012AA041805);长沙市科技计划重点项目(K1106197-11);长沙市雨花区科技计划项目(KJ11-2-03)

摘　　要：基于振动桩锤液压管路的流固耦合计算模型,结合面向地基土的负载特性分析方法,并考虑油泵流量脉动因素的影响,采用ANSYS与CFX进行有限元联合仿真,研究沉桩过程中液压管路振动特性的变化规律,确定其发生强烈振动的原因。同时,通过卡箍的动力学优化设计,对液压管路的振动进行控制。研究结果表明:卡箍的固定位置、数量等设计参数是影响液压管路振动特性的重要因素,当增设1处卡箍时其一阶自振频率最大提高22.4 Hz,增设2处时最大提高56.6Hz,最终得到能有效避免管系共振发生的优化设计方案,仿真及试验结果验证了该新方法是可行的,其研究成果可为复杂输流管路的铺设安装与振动控制提供参考。Based on the finite element model of fluid-solid interaction, combined with dynamic load characteristic analysis method facing ground soil, and taking into account the pumps’ flow pulsation, the vibration characteristics of hydraulic vibratory pile hammer pipeline during pile sinking process were studied by using ANSYS and CFX finite element simulation, and the causes of hydraulic pipeline which displayed violent vibration were confirmed in theory. Furthermore, according to the clamps’ optimal design, vibration control of the hydraulic pipeline was investigated. The results show that both clamps’ installation position and quantity are the main influence factors of hydraulic pipeline’s dynamic characteristics. When a clamp is placed in hydraulic pipeline, its one order natural frequency can increase by 22.4 Hz, but increases by 56.6 Hz when two clamps are added. The optimal design scheme avoiding hydraulic pipeline resonance is obtained. The simulation results and the field test results indicate that the new method is feasible. The research provides reference for the installation and vibration control of complex fluid-conveying pipeline.

关 键 词：液压管路 流固耦合 液压振动桩锤 地质特性 振动控制 

分 类 号：TH113.1[机械工程—机械设计及理论]