基于流固耦合理论的混凝土泵车臂架系统动力学仿真.pdf

基于流固耦合理论的混凝土泵车臂架系统动力学仿真 王斌华 吕彭民 (长安大学 道路施工技术与装备教育部重点实验室，陕西 西安 710064) 摘要：基于多体运动学理论和 Hamilton 变分原理，建立基础振动—倾斜悬臂输液管流固耦 合运动方程，并根据混凝土输送泵车臂架系统工作原理和结构特点，采用有限单元理论建立 臂架系统的运动微分方程，分析出混凝土流动与臂架结构振动的耦合作用。结合 Matlab 仿 真分析与 Ansys 臂架空间有限元模型，分别计算了臂架倾角 α 0 、20 、52 和80 时的臂架结 构动应力历程。将各姿态下各节臂架的大应力点绘制于 Goodman 疲劳极限线图内，对该泵 车结构进行疲劳强度评估。根据评估结果对泵车结构进行了改进。该方法可用于同类产品的 设计计算。 关键词：混凝土泵车；臂架系统；流固耦合；疲劳强度评估；仿真分析 中图分类号：TU646 Dynamic Simulation of Arm System of Pump Truck Based on Fluid-solid Interaction Theory Wang Binhua, Lu Pengmin (Key Laboratory for Highway Construction Technology and Equipment of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China) Abstract: Dynamic differential equation of a cantilevered pipe is derived based on kinematical theory and Hamilton variation principle. In order to analyse the coupling effect between concrete fluid and arm structure used in pump truck, the finite element formulation for the fully coupled dynamic equation is introduced according to the working principle and structural characteristics of pump truck. Dynamic stress history of arm system with parameters of dip angle as follows: α 0 、20 、52 and α 80 are simulated combining MATLAB simulation analyses with ANSYS finite element model. Structure improvement of arm system is done according to assessment analysis in Goodman Fatigue Limit Diagram. The investigation method can be applied for the design calculation of similar products. Keywords: concrete pump truck; arm system; fluid-structure coupling; fatigue assessment; simulation analysis 0 引言 自从1885 年 Brillouin 首次观察到流体引起的管道振动现象，并引起人们对输液管问题 的研究兴趣以来，有关输流管道流固耦合振动问题的研究已得到广泛的发展。Païdoussis 教 授和我国《固体力学学报》副主编