KOREASCHOLAR

A Comparison of Optimization Algorithms: An Assessment of Hydrodynamic Coefficients

Daewon Kim
  • LanguageENG
  • URLhttp://db.koreascholar.com/Article/Detail/352247
해양환경안전학회지
Vol.24 No.3 (2018.05)
pp.295-301
해양환경안전학회 (The Korean Society Of Marine Environment & Safety)
Abstract

This study compares optimization algorithms for efficient estimations of ship's hydrodynamic coefficients. Two constrained algorithms, the interior point and the sequential quadratic programming, are compared for the estimation. Mathematical optimization is designed to get optimal hydrodynamic coefficients for modelling a ship, and benchmark data are collected from sea trials of a training ship. A calibration for environmental influence and a sensitivity analysis for efficiency are carried out prior to implementing the optimization. The optimization is composed of three steps considering correlation between coefficients and manoeuvre characteristics. Manoeuvre characteristics of simulation results for both sets of optimized coefficients are close to each other, and they are also fit to the benchmark data. However, this similarity interferes with the comparison, and it is supposed that optimization conditions, such as designed variables and constraints, are not sufficient to compare them strictly. An enhanced optimization with additional sea trial measurement data should be carried out in future studies.

Table Content
Abstract
 1. Introduction
 2. Optimization algorithms
  2.1 Interior point
  2.2 Sequential quadratic programming
 3. Estimation of hydrodynamic coefficients
  3.1 Mathematical model
  3.2 Benchmark data
  3.3 Optimization conditions
 4. Comparison of algorithms
  4.1 Optimization results
  4.2 Review of results
 5. Conclusion
 References
Author
  • Daewon Kim(Graduate School, Faculty of Mechanical Engineering and Marine Technology, University of Rostock) Corresponding Author