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A method for improving the simulation efficiency of trawl based on simulation stability criterion

机译：一种基于仿真稳定性准则的拖网仿真效率提高方法

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摘要

The lumped-mass method is one of the most fundamental methods to simulate the dynamic behavior of submerged flexible nets. However, the low calculation efficiency limits its applications. In order to improve the calculation efficiency, the numerical stability of lumped-mass method based on explicated Euler integral algorithm was investigated. The simulation stability criterion was derived as a function of simulation step size and the physical parameters of netting materials. A physical parameter optimization (PPO) method was put forward to calculate the desired values of the lumped-mass model's physical parameters based on stability criterion; length compensation was implemented to compensate the extra deformation of mesh bars caused by the changes of their stiffness. The PPO method can ensure the stability of the lumped-mass model with a desired simulation step size while minimizing the change to the physical parameters. A lumped-mass model of trawl gear was established with the PPO method, the simulation results were compared with those of the conventional lumped-mass method (without PPO) to validate the improvements. By using the PPO method, the calculation efficiency can be accelerated by 40 times while only inducing less than 2% error to the simulation results. (C) 2016 Elsevier Ltd. All rights reserved.
机译：集总质量方法是模拟浸入式柔性网络动力学特性的最基本方法之一。但是，低的计算效率限制了其应用。为了提高计算效率，研究了基于简化欧拉积分算法的集总质量方法的数值稳定性。根据仿真步长和网状材料的物理参数得出仿真稳定性标准。提出了一种基于稳定性准则的集总质量模型物理参数期望值的物理参数优化方法。进行长度补偿是为了补偿由于钢筋刚度变化而引起的钢筋变形。 PPO方法可以确保集总质量模型具有所需仿真步长的稳定性，同时将对物理参数的更改最小化。用PPO方法建立了拖网齿轮的集总质量模型，并将仿真结果与传统集总质量方法（无PPO）进行了比较，以验证改进的效果。通过使用PPO方法，计算效率可以提高40倍，而对模拟结果的误差仅不到2％。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Ocean Engineering》 |2016年第1期|63-77|共15页
  • 作者

    Yao Yeming; Chen Yinglong; Zhou Hua; Yang Huayong;

  • 作者单位

    Zhejiang Univ, State Key Lab Fluid Power Transmiss & Control, ZheDa Rd 38, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Fluid Power Transmiss & Control, ZheDa Rd 38, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Fluid Power Transmiss & Control, ZheDa Rd 38, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, State Key Lab Fluid Power Transmiss & Control, ZheDa Rd 38, Hangzhou 310027, Zhejiang, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Trawl; Numerical simulation; Physical parameter optimize; Step size; Calculation efficiency; Lumped-mass method;

    机译：拖网;数值模拟;物理参数优化;步长;计算效率;集总法;

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