Experimental and numerical investigation of the honeycomb structures’ effect on the dynamic characteristics of rotors: a modal analysis

This scientific research presents a modal analysis of the impact of honeycomb structures on rotors’ dynamic characteristics. The natural frequencies and mode shapes of free vibration were determined employing the modal analysis. The impact hammer and the laser vibrometer were used for experimental modal analysis to provide valuable data using OptoGUI data acquisition software. The numerical modal analysis was performed by the finite element method using ANSYS software to validate the experimental results. The main objective of this study was to evaluate the influence of honeycomb structures on natural frequencies and critical speeds by comparing the dynamic behaviour of the rotors with the simple hollow shafts and the hollow shaft with honeycomb structures. The results indicated that the integration of honeycomb structures injected important stiffness and damping properties, leading to significant variations in the natural frequencies and critical speeds of the rotors. The agreement between the experimental and numerical results validated the accuracy of the numerical model and predicted the dynamic behaviour of the rotors. This validation is crucial for the dynamics of rotor design and future applications. The results offer new perspectives on rotor behaviour with honeycomb structures that develop and optimize future design.