混凝土泵车臂架系统振动机理的研究

结合悬臂输液管流固耦合理论，建立泵车臂架结构与混凝土的流固耦合动力学方程，从流固耦合的角度分析混凝土泵车臂架振动问题。通过试验测试获得混凝土脉动流速图以及仿真边界条件。采用Newmark-β法求解动力学方程，仿真分析了混凝土流动为脉动和常速流时臂架振动响应，发现振动位移响应基本吻合，说明脉动流速对臂架结构应力历程影响较小；仿真分析转台振动为零振动时，混凝土脉动和常速流时臂架振动响应，发现泵送油缸导致的车体振动激扰是臂架振动的主要因素，在臂架系统振动研究时应重点考虑。

Research on vibration principle of arm system of concrete pump truck

In order to analyze the vibration problem of arm system on concrete pump truck from the perspective of fluid-solid interaction theory, its dynamic equation is established based on cantilever conveying pipe theory. Fluctuating velocity of concrete flow and vibration boundary conditions of arm system are experimentally measured. The vibration responses of arm system with two speeds of fluctuating and constant velocity are achieved by the method of simulation calculation. Simulation results show that displacement responses are in agreement with each other. Therefore, the velocity fluctuation has little influence on stress history of arm system. When the swivel table of concrete pump truck is under stationary state, the vibration responses of arm system with two speeds are achieved by the method of simulation calculation. Simulation results show that car-body vibration as a result of cylinder impact action has great influence on arm system vibration. Therefore, it is proposed that the vibration of swivel table should be mainly considered.