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<p>The goal of this study is to investigate the dynamic behaviour of machine tool structures with a focus on the influence of structural modification on natural frequencies and machining performance. Natural frequency shift as a result of machine tool dynamics changes can significantly deteriorate tool stability and machining quality, especially in high-performance cutting. A numerical model for predicting frequency shifts caused by structural modifications was validated experimentally. The model provides that the structural modifications result in changes in the values of the spatial location, influencing the natural frequency of the tool. FEA Program is used for the calculation of natural frequencies and mode shapes, and experimental modal analysis (EMA) validated the findings with an error of about 10%. Finite element analysis (FEA) was conducted to find mode shapes and natural frequencies, and spatial analysis across 27 spindle positions revealed that the maximum static deformation varied from 0.0498 to 0.1497&#xa0;mm, and natural frequency varied up to ± 10.41% across different modes. The findings form the basis for machine tool design optimization and structure reliability optimization and contribute to performance improvement in advancer manufacturing environment.</p>

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Precision analysis and prediction of position-dependent structural natural frequencies in five-axis cradle machine tools

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Tzu-Chi Chan,
  • Aman Ullah,
  • Bedanta Roy

摘要

The goal of this study is to investigate the dynamic behaviour of machine tool structures with a focus on the influence of structural modification on natural frequencies and machining performance. Natural frequency shift as a result of machine tool dynamics changes can significantly deteriorate tool stability and machining quality, especially in high-performance cutting. A numerical model for predicting frequency shifts caused by structural modifications was validated experimentally. The model provides that the structural modifications result in changes in the values of the spatial location, influencing the natural frequency of the tool. FEA Program is used for the calculation of natural frequencies and mode shapes, and experimental modal analysis (EMA) validated the findings with an error of about 10%. Finite element analysis (FEA) was conducted to find mode shapes and natural frequencies, and spatial analysis across 27 spindle positions revealed that the maximum static deformation varied from 0.0498 to 0.1497 mm, and natural frequency varied up to ± 10.41% across different modes. The findings form the basis for machine tool design optimization and structure reliability optimization and contribute to performance improvement in advancer manufacturing environment.