基于LMS Virtual. Lab和AMESim的泥浆泵联合仿真及曲轴结构优化

Co-simulation of mud pump and optimization of crankshaft structure based on LMS Virtual. Lab and AMESim

由于泥浆泵曲轴受到复杂的交变应力,导致曲轴曲柄销过渡圆角处因受到过大应力而疲劳失效。采用LMS Virtual.Lab和AMESim分别建立了泥浆泵动力端系统和液力端系统模型,并将2个子模型集成一体化模型,最终实现机械、液力系统的联合仿真对泥浆泵曲轴应力进行分析,得到曲轴运行时的应力分布。为了降低曲柄梢过渡圆角处的应力,设计优化阶梯形圆角来代替泥浆泵曲轴曲柄销圆角。再基于响应面法建立以曲柄梢圆角应力最小为优化目标的模型,通过优化前后的应力对比可得:当设计因子为R_1=4 mm,R_2=3.2 mm,H=122 mm时,优化后的应力较优化前降低了20.29%,优化模型可为泥浆泵曲轴的设计提供参考。

Because of the complex alternating stress of the mud pump crankshaft,fatigue failure frequently occurs at the transition round corner of the crank pin fillet due to the excessive stress. The mud pump power end system and the hydraulic power system model were established by using LMS Virtual. Lab and AMESim,respectively,the two sub models were integrated to an integration model,finally the co-simulation of the mechanical and hydraulic system of mud pump crankshaft was realized,and the stress distribution of the crankshaft was obtained. To reduce the stress at the transition round corner of the crank pin,the optimum step fillet was designed to replace the crank pin fillet of the mud pump crankshaft. Based on the response surface method,the model with the minimum crank pin fillet stress as optimum objective was established. The stress comparison between before and after optimization shows that,with the design factors of R1= 4 mm,R2= 3. 2 mm and H = 122 mm,the stress is reduced by 20. 29% after optimization than before and the optimized model can provide reference for the design of mud pump crankshaft.