Abstract
Abstract Composite materials have become a research hotspot in the field of vibration and noise reduction for their high strength, high damping, and other outstanding mechanical properties in recent years. In this paper, the effect of laminated materials on the dynamic performance of floating rafts is investigated based on modal superposition theory using the finite element method. The detailed derivation of the modal superposition theory was made, and taking T700 fiber-reinforced composite material as an example the damping effect of the floating raft structure in three cases was discussed: whether the composite material is laid or not, different layup angles, and different layup positions. The research shows that laying composite materials can improve damping effect of the floating raft and the changes in both the laying angle and the laying position will affect its dynamic performance. Moreover, the damping performance of the structure is inversely correlated with its stiffness within a certain range.
Highlights
Composite materials have become a research hotspot in the field of vibration and noise reduction for their high strength, high damping, and other outstanding mechanical properties in recent years
Taking single equipment operation as an example, the influence of laying of composite materials on vibration and noise reduction effect of the floating raft structure is discussed with the help of ABAQUS
Comparing the modalities of composite floating raft and steel floating raft structures, the composite floating raft is made of 0.009 m thick nickel alloy plate with 6 layers of unit thickness of 0.001 m of T700-12K carbon fiber composite material in a [0°] layup combination
Summary
Abstract: Composite materials have become a research hotspot in the field of vibration and noise reduction for their high strength, high damping, and other outstanding mechanical properties in recent years. The effect of laminated materials on the dynamic performance of floating rafts is investigated based on modal superposition theory using the finite element method. The research shows that laying composite materials can improve damping effect of the floating raft and the changes in both the laying angle and the laying position will affect its dynamic performance. Li et al [26,27] used the Jacobi-Ritz method to analyze the free vibration of composite laminated structure and compared the results with finite element calculations to verify the accuracy and reliability of the method. In order to reduce the complexity of the calculation and improve the rapidity and effectiveness of the analysis, this paper adopts the modal superposition method to calculate the dynamic characteristics of the composite floating raft.
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