Yingqi1,2,3,4

Abstract—The midwater trawl is used widely in many oceanic fisheries. In this study, the midwater trawl dynamical behavior was simulated and modeled with the mathematical mechanic equations based on R language platform. A lump-mass and spring method was used to build the physical model. The huge mathematical stiff differential equations were solved by an implicit algorithm. On the R platform, the programming, simulation and visualization of the model were done quickly. The three-dimensional dynamical behavior of the midwater trawl in steady flow was presented successfully and the effectiveness of this method was verified. And the results were accord with the actual measured data in the ocean. Keywords-component; midwater trawl;meshes grouping; lumped mass method;implicit algorithm;numerical simulation I