Marine Design & Research Institute of China

A Hybrid Coarse-Fine Mesh Generation Method for Hull Structures Based on Precise Geometric Models

Finite element analysis is essential for ship structural design because it enables accurate assessment of structural strength, fatigue, and vibration performance. However, mesh generation for large-scale hull structures remains challenging due to the trade-off between computation...

Vibration response of a waterjet propulsion pump under low-gas-fraction microbubble inflow

This study experimentally investigates the vibration attenuation effect of low-inlet-gas-volume-fraction microbubble inflow in a waterjet propulsion pump. Hydraulic performance and triaxial vibration responses at the inlet, impeller, and outlet were measured under IGVF values of...

PID controller parameter optimization for ship fin stabilizers based on an improved secretary bird optimization algorithm

Fin stabilizers governed by proportional-integral-derivative (PID) controllers dominate active ship roll reduction, yet their performance depends critically on gain tuning under nonlinear hydrodynamics and time-varying sea states. This paper proposes an Improved Secretary Bird Op...