Vibration analysis of FRP ship for eco-friendly design by considering resonance
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초록
This study analyzes the natural vibration characteristics of a 19-ton fiber-reinforced plastic (FRP) pilot boat to investigate resonance risks between the hull structure and excitation frequencies induced by the main engine and propeller. Finite element analysis (FEA) was conducted using MSC Patran–Nastran to evaluate both hull-girder and deck modes under lightship and full-load conditions. The FRP material properties were defined based on previous studies, and hydrodynamic mass effects were included in the modeling. The natural frequencies were compared with the excitation frequencies derived from the propulsion system. Results show that the hullgirder modes fall within safe frequency ranges, while deck modes—especially the bottom plate—exhibited critical resonance risks, indicating complete frequency coincidence with excitation forces. The findings emphasize that many small FRP vessels may be inherently vulnerable to excessive vibrations due to resonance. The outcomes provide fundamental reference data for vibration mitigation strategies at the design stage of small FRP vessels, with implications for the development of next-generation eco-friendly ships.
Abstract
This study analyzes the natural vibration characteristics of a 19-ton fiber-reinforced plastic (FRP) pilot boat to investigate resonance risks between the hull structure and excitation frequencies induced by the main engine and propeller. Finite element analysis (FEA) was conducted using MSC Patran–Nastran to evaluate both hull-girder and deck modes under lightship and full-load conditions. The FRP material properties were defined based on previous studies, and hydrodynamic mass effects were included in the modeling. The natural frequencies were compared with the excitation frequencies derived from the propulsion system. Results show that the hullgirder modes fall within safe frequency ranges, while deck modes—especially the bottom plate—exhibited critical resonance risks, indicating complete frequency coincidence with excitation forces. The findings emphasize that many small FRP vessels may be inherently vulnerable to excessive vibrations due to resonance. The outcomes provide fundamental reference data for vibration mitigation strategies at the design stage of small FRP vessels, with implications for the development of next-generation eco-friendly ships.