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针对混凝土泵车的工作原理和结构特点,结合现有输送管流固耦合理论的研究成果,提出了基础有平动位移的悬臂输送管理论模型,并通过多体运动学理论和Hamilton变分原理,建立该模型的运动微分方程。采用有限单元理论建立混凝土泵车臂架系统的流固耦合运动微分方程。选取混凝土流速U=2.265m/s和不考虑混凝土流动进行对比仿真分析后发现:两者臂架振动响应均值相同;但稳态时两者振动幅值比值最大,接近2;而改变Rayleigh阻尼系数则对臂架振动响应影响不大,这说明混凝土的流动增加臂架振动阻尼效应显著。结合Matlab仿真分析与Ansys三维有限元模型,模拟计算出了臂架结构动应力,对比测点应力测试结果与模拟计算结果,两者应力历程变化趋势相似,应力值较接近,最大差异小于20MPa,验证了仿真模型的合理性。
According to the working principle and structural characteristics of concrete pump truck, combined with the research results of fluid-solid coupling theory of existing pipelines, a theoretical model of cantilever pipe with translational displacement is proposed. By using multi-body kinematics theory and Hamilton variational principle , Set up the model of differential equations of motion. The finite element theory was used to establish the fluid-structure coupled differential equations of motion for the boom system of concrete pump truck. The simulation analysis of concrete flow velocity U = 2.265m / s and comparison of concrete flow shows that the average vibration amplitude of the two jibs is the same, but the maximum vibration amplitude ratio is close to 2 at steady state, while the Rayleigh damping coefficient It has little effect on the vibration response of the boom, which shows that the increase of the concrete flow can increase the vibration damping effect of the boom significantly. Combined with Matlab simulation analysis and Ansys three-dimensional finite element model, the dynamic stress of the boom structure was simulated and compared with the stress measurement results and the simulation results of the measuring points. The trend of the stress history was similar, the stress values were close, the maximum difference was less than 20MPa, Verify the rationality of the simulation model.