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Improved many-objective particle swarm optimization based welding sequence optimization research.

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Summary
This summary is machine-generated.

Optimizing welding sequences for ships reduces deformation and stress. An improved algorithm (IMaOPSO) enhances traditional methods, leading to better welding quality and efficiency in shipbuilding.

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Area of Science:

  • Naval Architecture and Marine Engineering
  • Computational Engineering
  • Materials Science and Engineering

Background:

  • Traditional welding sequence optimization (WSO) methods for ship components are often inadequate, relying on experience and leading to issues like deformation and cracking.
  • Complex, multi-objective, and nonlinear challenges in WSO necessitate advanced systematic approaches.
  • Existing optimization algorithms may struggle with the high dimensionality and specific constraints of shipbuilding WSO.

Purpose of the Study:

  • To develop a systematic welding sequence optimization (WSO) method for ship structural parts.
  • To integrate process and geometric constraints into a formal optimization framework.
  • To quantify structural deformation and residual stress as key optimization objectives.

Main Methods:

  • Development of an Improved Many-Objective Particle Swarm Optimization (IMaOPSO) algorithm.
  • Enhancement of classical Particle Swarm Optimization (PSO) with adaptive fuzzy dominance and elite-guided perturbation for improved convergence and diversity.
  • Simulation analysis using SYSWELD software to evaluate different welding sequences.

Main Results:

  • The IMaOPSO algorithm demonstrated superior convergence speed and stability compared to established algorithms (NSGA-II, SPEA2, SMPSO).
  • A case study on a ship deck structure showed significant reductions in average deformation (32.6% to 62.2%) using the optimized sequence.
  • The proposed method effectively addresses high-dimensional WSO problems with integrated constraints.

Conclusions:

  • The developed systematic WSO method, powered by IMaOPSO, offers a robust solution for complex shipbuilding challenges.
  • The optimized welding sequences significantly improve welding quality by reducing deformation and residual stress.
  • This approach holds substantial practical engineering value for enhancing efficiency and quality in shipbuilding.