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为分析水下复杂地貌下海底犁式挖沟机动力性能,采用光滑粒子流体动力学法(SPH)和欧拉-拉格朗日耦合法(CEL)建立犁体、海底土壤及流场三者的相互作用仿真模型.通过实验数据及经验公式验证了仿真模型求解的可靠性,并仿真分析了复杂海底地貌及海底冲击载荷对犁体牵引力的影响.仿真结果表明:在余弦波地貌上坡运行的牵引力迅速增加,达到预定沟深时斜坡地貌的牵引力比水平海底的牵引力增加近71.4%,冲击载荷30kN与冲击载荷10kN相比,牵引力增加平均值为24.76%.在不同流速方向及水深的流场情况下分析了挖沟机运行对流场应力的影响.随着挖沟机的运行,在挖沟机前端会产生局部流场应力集中.随着流场深度的增加,牵引力会随之增加.
In order to analyze the dynamic performance of subsea plow trencher under the complex underwater landform, the plow body, seafloor soil and flow field are established by the method of smooth particle hydrodynamics (SPH) and Euler-Lagrange coupling method (CEL) The simulation results show the reliability of the simulation model and the influence of complex submarine topography and submarine impact load on the plow traction.The simulation results show that: The traction force of slope topography increased nearly 71.4% compared with that of horizontal seafloor when reaching the predetermined groove depth. The average increase of traction force was 24.76% when the impact load was 30kN and the impact load was 10kN. At different flow velocities and depth of flow Field conditions, the influence of trenching machine operation on the flow field stress is analyzed.With the operation of trenching machine, the local flow field stress concentration will occur at the front of trencher.As the flow field depth increases, the traction force will increase .