基于ANSYS/LS-DYNA的碎土型犁体曲面仿真优化

Simulation Optimization of Plough Surface of Broken soil Type Based on ANSYS/LS-DYNA

由于缺乏从动力学上考虑犁体曲面的形成因素对牵引阻力和翻垡性能的影响,使犁体曲面设计研究受到限制。为此,采用ANSYS/LS-DYNA建立碎土型犁体曲面作业动力学仿真模型,并进行物理试验验证后,利用该模型分别进行铧刃角、起土角、导曲线两端点切线夹角(简称切线夹角)和高度与开度比(简称高开度比)的单因素仿真试验,分析各因素对牵引阻力和翻垡性能的影响规律和影响机理,为犁体曲面的优化设计提供一定的依据。试验结果表明,建立的碎土型犁体曲面作业动力学仿真模型精度较高,当铧刃角为38°,起土角为23.76°,切线夹角为108.462°,高开度比为1.765时,牵引阻力最小;当铧刃角为42.8°,起土角为26.06°,切线夹角为114.67°,高开度比为1.78时,翻垡性能最强。

The design of plough surface is limited by the lack of dynamic consideration of the influence of forming factors of plough surface on traction resistance and tilting performance.To this end,ANSYS/LSDYNA was used to establish the operation dynamic simulation model of the plough surface,and after physical test verification,the model was used to carry out single factor simulation tests of the blade angle,the soil lifting angle,the tangent angle between the two ends of the guide curve(referred to as the tangent angle)and the ratio of height to openness(referred to as the high openness ratio).The influence law and mechanism of each factor on traction resistance and tilting performance are analyzed,which can provide a certain basis for optimal design of plough body surface.The experimental results show that the dynamic simulation model of the plough surface operation is of high precision.When the blade angle is 38°,the soil lifting angle is 23.76°,the tangent angle is 108.462°and the high openness ratio is l.765,the traction resistance is the least.When the blade edge angle is 42.8°,the soil lifting angle is 26.06°,the tangent angle is 114.67°and the high openness ratio is 1.78°,the tilting performance is the best.