海底犁式挖沟机犁体动力学数值仿真分析
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摘要
有效模拟海底犁式挖沟机犁体土壤挖掘过程及分析犁体受力情况对整机结构优化及提高操控性具有重要意义.本文分析了线性Drucker-Prager塑性屈服准则的土壤弹塑性本构方程,结合一阶线性水波对海底土壤的动压力方程,建立犁体、海底土壤及海流的动力学方程,采用ABAQUS无网格粒子法进行仿真模型的数值求解.通过陆地试验结果验证基于无网格粒子法的犁体挖掘土壤仿真模型的可行性.针对海底作业情况仿真,结果表明水波对犁体牵引力产生正弦影响.同时揭示犁体作业时土壤的应力变化过程,随着土工参数值的增加,犁体牵引力呈非线性增加,其中弹性模量影响较大,不排水剪切强度及摩擦角影响近似.
In an effort to optimize structure of the overall unit and improve maneuverability,it is important to efficiently simulate the submarine plow body soil cutting process,and analyze the force conditions of the plow body.The soil constituent model for elastic-plastic behavior based on linear Drucker-Prager plastic yield criterion was analyzed,and by combining the first order dynamic pressure equation of wave vs.the soil of seabed,the dynamics equations for submarine plow body,seabed and seawater were designed.By using the smoothed particle hydrodynamics method utilize the numerical solver ABAQUS,a simulation model was built and solved numerically.This method of simulating was validated to be feasible by using the land experimental results.The results of the simulation test in the underwater condition indicate that the wave pressure impacted the plow body towing force with a sine functional tendency depicting vibration.In addition,the observation reveals the soil stress change when the plow body is in operation.With increasing of the soil parameter value,the plow body towing force rises nonlinearly,among which the influence of the modulus of elasticity is heavier,and the un-drained shearing strength and frictional angle have similar effects.
In an effort to optimize structure of the overall unit and improve maneuverability,it is important to efficiently simulate the submarine plow body soil cutting process,and analyze the force conditions of the plow body.The soil constituent model for elastic-plastic behavior based on linear Drucker-Prager plastic yield criterion was analyzed,and by combining the first order dynamic pressure equation of wave vs.the soil of seabed,the dynamics equations for submarine plow body,seabed and seawater were designed.By using the smoothed particle hydrodynamics method utilize the numerical solver ABAQUS,a simulation model was built and solved numerically.This method of simulating was validated to be feasible by using the land experimental results.The results of the simulation test in the underwater condition indicate that the wave pressure impacted the plow body towing force with a sine functional tendency depicting vibration.In addition,the observation reveals the soil stress change when the plow body is in operation.With increasing of the soil parameter value,the plow body towing force rises nonlinearly,among which the influence of the modulus of elasticity is heavier,and the un-drained shearing strength and frictional angle have similar effects.
引文
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[2]GINGOLD R A,MONAGHAN J J.Kernel estimates as a basis for general particle methods in hydrodynamics[J].Journal of Computational Physics,1982,46:429-453.
[3]宿崇,唐亮,侯俊铭,等.基于FEM与SPH耦合算法的金属切削仿真研究[J].系统仿真学报,2009,21(16):5002-5005.SU Chong,TANG Liang,HOU Junming,et al.Simulation research of metal cutting based on FEM and SPH[J].Jour-nal of System Simulation,2009,21(16):5002-5005.
[4]ZHANG Aman,YANG Wenshan,YAO Xiongliang.Nu-merical simulation of underwater contact explosion[J].Ap-plied Ocean Research,2012,34:10-20.
[5]杨望,蔡敢为,杨坚.土壤直剪试验的动力学仿真[J].农业机械学报,2011,42(7):96-101.YANG Wang,CAI Ganwei,YANG Jian.Dynamics simula-tion of direct shear test[J].Transactions of the Chinese So-ciety for Agricultural Machinery,2011,42(7):96-101.
[6]ZHONG Jiang,ZHANG Xian,JIANG Jiandong,et al.A-nalysis of3-D numerical simulation for soil cutting by small agricultural machinery[J].Advanced Materials Research,2012(433-440):6182-6189.
[7]丁峻宏,金先龙,郭毅之,等.土壤切削大变形的三维数值仿真[J].农业机械学报,2007,4(8):118-121.DING Junhong,JIN Xianlong,GUO Yizhi,et al.Study on 3-D numerical simulation for soil cutting with large deforma-tion[J].Transactions of the Chinese Society for Agricultural Machinery,2007,4(8):118-121.
[8]宫含洋,王立权,邢晓冬,等.海底犁式挖沟机犁体建模及土壤裂解研究[J].机械工程学报,2012,48(19):134-140.GONG Hanyang,WANG Liquan,XING Xiaodong,et al.Modeling of the plow body of submarine plowing trencher and analysis of the soil cutting process[J].Chinese Journal of Mechanical Engineering,2012,48(19):134-140.
[9]廖红建,王铁行.岩土工程数值分析[M].北京:机械工业出版社,2006:39-54.
[10]IVANOVIC A,NEILSON R D,O’NEILL F G.Modelling the physical impact of trawl components on the seabed and comparison with sea trials[J].Ocean Engineering,2011,38(7):925-933.
[11]费康,张建伟.ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社,2010:67-77.
[12]李广信.高等土力学[M].北京:清华大学出版社,2004:65-68.
[13]邹志利.水波理论及其应用[M].北京:科学出版社,2004:15-25.
[14]YE J,JENG D S.Effects of bottom shear stress on the wave-induced dynamic response in a porous seabed:PO-RO-WSSI(shear)model[J].Acta Mechanica Sinica,2011,27(6):898-910.
[15]VIOLEAU D,ISSA R.Numerical modeling of complex turbulent free-surface flows with the SPH method:an over-view[J].International Journal for Numerical Methods in Fluids,2007,53(2):277-304.
[16]WEN F,JENG D S,WANG J H,et al.Numerical model-ing of response of a saturated porous seabed around an off-shore pipeline considering non-linear wave and current in-teraction[J].Applied Ocean Research,2012,35:25-37.
[17]LIBERSKY L D,PETSCHEK A G,CARNEY T C,et al.High strain Lagrangian hydrodynamics:a three-dimension-al SPH code for dynamic material response[J].Journal of Computational Physics,1993,109(1):67-75.