Scholarlink

<p>The structural optimization and stability validation of naval Underway Replenishment (UNREP) and Replenishment at Sea (RAS) stations are vital for ensuring operational efficiency and safety in dynamic maritime environments. This study integrates finite element analysis (FEA) with advanced optimization techniques such as genetic algorithms, surrogate modeling, and perturbation load analysis to enhance structural stability while minimizing weight. The design focuses on optimizing key parameters including plate thickness and stiffener arrangement, which led to a 10% reduction in structural weight without compromising integrity. Mild steel (ASTM A-36) was selected for its favorable mechanical properties, and meshing strategies were refined to improve the accuracy of stress and deformation predictions under varying operational loads. FEA results revealed that the maximum von Mises stress in the structure was 219.06&#xa0;MPa, remaining within the allowable limit of 220&#xa0;MPa for ASTM A-36 steel, validating the structural safety of the design. Boundary conditions were carefully defined to simulate real-world constraints, enhancing model reliability. Additionally, stability validation was conducted in accordance with SOLAS II-1 Regulation 5.4. The manual stability assessment confirmed that the new installation, weighing 19,246.061&#xa0;kg, caused only a 0.17% increase in lightship displacement. Changes in vertical and longitudinal centers of gravity (VCG and LCG) were 0.12 and 0.04%, respectively well within the 0.5% regulatory limits. The transverse center of gravity (TCG) shift was negligible at 0.018&#xa0;m, indicating no risk of listing. As these changes remain within permissible limits, a re-inclination experiment is not required. Only an addendum to the Trim and Stability booklet is required, confirming full compliance with SOLAS II-1 Regulations 5.4 and 5.5. Overall, the study presents a robust, regulation-compliant methodology for optimizing UNREP/RAS stations, supporting future advancements in naval structural design and safety.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Optimized Structural Design and Stability Validation of Naval UNREP/RAS Stations: A Finite Element and Stability Integration Study

  • 期刊论文

  • 发表日期：

    2025年9月30日

查看全文
  • Md. Abdullah,
  • Abu Daud Anam,
  • Robiul Hossen

摘要

The structural optimization and stability validation of naval Underway Replenishment (UNREP) and Replenishment at Sea (RAS) stations are vital for ensuring operational efficiency and safety in dynamic maritime environments. This study integrates finite element analysis (FEA) with advanced optimization techniques such as genetic algorithms, surrogate modeling, and perturbation load analysis to enhance structural stability while minimizing weight. The design focuses on optimizing key parameters including plate thickness and stiffener arrangement, which led to a 10% reduction in structural weight without compromising integrity. Mild steel (ASTM A-36) was selected for its favorable mechanical properties, and meshing strategies were refined to improve the accuracy of stress and deformation predictions under varying operational loads. FEA results revealed that the maximum von Mises stress in the structure was 219.06 MPa, remaining within the allowable limit of 220 MPa for ASTM A-36 steel, validating the structural safety of the design. Boundary conditions were carefully defined to simulate real-world constraints, enhancing model reliability. Additionally, stability validation was conducted in accordance with SOLAS II-1 Regulation 5.4. The manual stability assessment confirmed that the new installation, weighing 19,246.061 kg, caused only a 0.17% increase in lightship displacement. Changes in vertical and longitudinal centers of gravity (VCG and LCG) were 0.12 and 0.04%, respectively well within the 0.5% regulatory limits. The transverse center of gravity (TCG) shift was negligible at 0.018 m, indicating no risk of listing. As these changes remain within permissible limits, a re-inclination experiment is not required. Only an addendum to the Trim and Stability booklet is required, confirming full compliance with SOLAS II-1 Regulations 5.4 and 5.5. Overall, the study presents a robust, regulation-compliant methodology for optimizing UNREP/RAS stations, supporting future advancements in naval structural design and safety.