绞刀切削天然气沉积物切削功率预测仿真

Cutting Power Prediction Simulation of the Cutting of Natural Gas Sediment by Cutter Head

研究绞刀切削天然气水合物沉积物功率预测问题。天然气水合物沉积物获取困难,实验方法难以实现切削功率预测,传统理论方法又难以真实反映切削力及功率的变化,针对上述难题,采用有限元模拟的方法,选择Drucker-Prager本构模型模拟砂岩型水合物沉积物,通过软件ansys/ls-dyna建立了刀齿切削天然气水合物沉积物的有限元模型,实现了绞刀切削天然气水合物沉积物的仿真。得到切削力,扭矩的变化曲线,进而计算得到切削功率曲线,并对横移速度对切削功率的影响进行了研究,对切削力及切削功率进行了频域分析。结果表明,切削力与切削功率随横移速度的增加近似呈幂函数规律增加;并得到了切削力以及切削功率的主振动频率计算公式。研究结果与已有研究具有较好的一致性,证明了仿真结果的可靠性。

ABSTRACT：Because of the difficulty in the getting of natural gas hydrate sediment, it is hard to realize cutting ex- periment. Besides, it is difficult for traditional theory method to reflect the real change of cutting force and power. In order to solve this problem so as to realize the power prediction, we choose Drucker-Prager elastic-plastic constitutive model as the material model of natural gas hydrate sediment. The finite element model of cutter head cutting natural gas hydrate sediment was built and solved with ANSYS/LS-DYNA. The cutting process of natural gas hydrate sedi- ment was simulated, cutting force and moment were obtained, and cutting power was calculated. Then the influence of transverse speed on cutting force was studied. Frequency domain analysis of cutting force and cutting power was conducted. The results show that cutting force and power increase as a power function of transverse speed. The formu- la of the main vibration frequency of cutting force and power were acquired~ Besides, the good consistency of the re- suits and the existing research proves the credibility of the simulation.