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1- Assistant professor, Department of Civil Engineering, SR.C., Islamic Azad University, Tehran, Iran
2- Assistant professor, Department of Civil Engineering, SR.C., Islamic Azad University, Tehran, Iran;
2- Assistant professor, Department of Civil Engineering, SR.C., Islamic Azad University, Tehran, Iran;
Abstract: (23 Views)
This study presents a comprehensive experimental investigation into the hydrodynamic performance of high-speed planning vessels equipped with adjustable trim tabs. Two scaled 40-foot beam-type models were tested under controlled towing tank conditions to assess the effects of trim angle variations on resistance, dynamic stability, and transition into the planning regime. The tests evaluated both untrimmed and trimmed configurations using multiple trim tab heights, measuring resistance forces, trim behavior, and planning onset velocities. Results demonstrate that optimal trim tab deployment significantly reduces hydrodynamic resistance, lowers the Hump Resistance Region, and enhances vessel stability at critical speeds. Trim tab configuration “B” showed superior performance, enabling earlier planning transition with lower power demand and reduced bow impact. Additionally, this study addresses model scaling effects, construction tolerances, and control system calibration to ensure fidelity with full-scale vessel behavior. The findings underscore the importance of trim tab integration in the design of modern high-speed vessels, offering practical insights for resistance minimization, propulsion efficiency, and structural safety in dynamic marine environments.
Keywords: High-speed vessels, Trim tab optimization, Hydrodynamic resistance, Planing performance, Experimental model testing, Towing tank analysis, Beam-type hulls, Resistance reduction, Trim angle effects, Marine propulsion efficiency
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Highlights
- Experimental towing tank tests were conducted on two 40-foot scaled beam-type planning vessel models equipped with adjustable trim tabs.
- Results show that optimal trim tab deployment significantly reduces hydrodynamic resistance and lowers the hump resistance region.
- Trim Tab configuration “B” enabled earlier planning transition, reduced bow impact, and lowered power demand compared to untrimmed and Tab A cases.
- Scaling effects, model construction tolerances, and ITTC-recommended procedures were carefully addressed to ensure fidelity with full-scale performance.
- Findings provide practical insights into improving propulsion efficiency, vessel stability, and structural safety in high-speed marine craft design.
Audio file of the article abstract [MP3 2551 KB] (1 Download)
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