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Purpose <p>Traditional marine propeller materials are replaced with composite material as they exhibit superior mechanical properties to their metallic counterparts. As the material recently gained the focus on marine applications, no detailed research was conducted on estimating the vibrational behaviour of the composite propeller with different rake &amp; skew angles and stacking sequencing. Hence, the study aims to estimate the free vibration analysis of composite marine propellers under dry and wet conditions via numerical methods.</p> Methods <p>A finite element-based numerical solver was chosen to conduct free vibration analysis to achieve this. Three geometrically ideal propellers were selected from one metallic material (aluminium) and two composite materials (Glass and carbon fibre reinforced material). The original design, which consists of a 0° rake and skew angle, was initially analysed for its performance. Later, the study was extended to three rake angles and two skew angles. Eight stacking sequences were developed and tested for their performance using unidirectional (UD) and Bidirectional fibres (BD). The numerical models were subjected to a steady state numerical finite element method (FEM) analysis based on the Helmholtz acoustic wave theory in the commercial software, ABAQUS, to extract the modal frequencies using an Acoustic Fluid–Structure Coupling approach to couple the propeller. The Block-Lanczos based solver is used in the FEM analysis for numerical computation.</p> Results and Conclusion <p>The study found a significant reduction (up to 81%) in the natural frequency level of composite propellers compared to metal propellers. The results reveal that the displacement has been found to be less than the metallic counterpart up to the first four mode shapes. Hence, it is proposed that the composite material has higher structural characteristics. A significant influence due to the ply orientation and geometry were identified, and those near the excitation frequency were reported. Thus, composite materials allow one to engineer the product according to the operating regime, and one can achieve the desired properties by proper hydroelastic tailoring. The results shall provide insight into optimising layup sequence and the performance of a composite propeller when designing for specific service conditions.</p>

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Influence of Geometry and Ply Orientation on the Vibrational Characteristics of B-Series Composite Propeller

  • 期刊论文

  • 发表日期：

    2025年1月8日

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  • Ashok Kumar,
  • C. H. Prem Kumar,
  • Rajagopalan Vijayakumar

摘要

Purpose

Traditional marine propeller materials are replaced with composite material as they exhibit superior mechanical properties to their metallic counterparts. As the material recently gained the focus on marine applications, no detailed research was conducted on estimating the vibrational behaviour of the composite propeller with different rake & skew angles and stacking sequencing. Hence, the study aims to estimate the free vibration analysis of composite marine propellers under dry and wet conditions via numerical methods.

Methods

A finite element-based numerical solver was chosen to conduct free vibration analysis to achieve this. Three geometrically ideal propellers were selected from one metallic material (aluminium) and two composite materials (Glass and carbon fibre reinforced material). The original design, which consists of a 0° rake and skew angle, was initially analysed for its performance. Later, the study was extended to three rake angles and two skew angles. Eight stacking sequences were developed and tested for their performance using unidirectional (UD) and Bidirectional fibres (BD). The numerical models were subjected to a steady state numerical finite element method (FEM) analysis based on the Helmholtz acoustic wave theory in the commercial software, ABAQUS, to extract the modal frequencies using an Acoustic Fluid–Structure Coupling approach to couple the propeller. The Block-Lanczos based solver is used in the FEM analysis for numerical computation.

Results and Conclusion

The study found a significant reduction (up to 81%) in the natural frequency level of composite propellers compared to metal propellers. The results reveal that the displacement has been found to be less than the metallic counterpart up to the first four mode shapes. Hence, it is proposed that the composite material has higher structural characteristics. A significant influence due to the ply orientation and geometry were identified, and those near the excitation frequency were reported. Thus, composite materials allow one to engineer the product according to the operating regime, and one can achieve the desired properties by proper hydroelastic tailoring. The results shall provide insight into optimising layup sequence and the performance of a composite propeller when designing for specific service conditions.