海底天然气水合物绞吸式开采绞刀切削力特性

根据绞刀头结构和工作原理以及天然气水合物沉积物的物理特性，建立切削天然气水合物沉积物的有限元模型，运用ANSYS/LS-DYNA仿真软件和Drucker-Prager材料模型模拟绞刀切削海底天然气水合物沉积物的过程，分析绞刀切削过程沿水平、竖直和转轴方向的受力特点，仿真分析绞刀横移速率、转速、下放角和切削区间角对切削力的影响规律。结果表明，增大横移速率会导致绞刀三个方向受力明显增大；转速提高会降低绞刀三个方向的切削力，随着转速增加，绞刀切削力的减小趋于平缓；绞刀下放角的增大会使绞刀轴向受力急剧增加，影响采矿车工作平稳性；随着切削区间角的增大，绞刀X轴方向力先增大后减小，工作时采用较大的切削区间角，可提高切削效率和采矿车工作稳定性。

Characteristics of cutting force in marine gas hydrate by cutter suction exploitation

The finite element model for cutting natural gas hydrate sediments was established according to the structure and working principle for the cutter head and the physical properties of the gas hydrate sediments.ANSYS/LS-DYNA simulation software and the Drucker-Prager material model were used to simulate the cuttings of the gas Hydrate sediment,and analyse the stress characteristics of the cutter in horizontal direction,vertical direction and rotation direction during the cutting process.The main working parameters,such as traverse rate,rotational speed,down angle and cutting interval angle was simulated.The results show that increasing the traverse rate will increase the force in the three directions of the cutter.The increase of the rotational speed will reduce the cutting force,but the reduction rate of the cutting force decreases with the increase of the rotational speed.The increase of the cutter angle will increase the axial force of the cutter and affect the smoothness of the mining truck.With the increase of the cutting interval angle,the X-axis force increases first and then decreases.Using a larger cutting interval angle can improve the cutting efficiency and the stability of mining vehicles.