آنالیز مودال شفت و پروانه توربین توربوشارژر EF7 به روش تجربی و عددی

In this study, the dynamic behavior of the shaft and turbine wheel assembly of a turbocharger was investigated to identify its natural frequencies using both experimental modal testing and numerical analysis through the Abaqus software. In the experimental phase, the assembly was subjected to controlled impact excitation, and the vibration responses were measured using an accelerometer and a dynamic signal analyzer. The acquired signals were processed in the frequency domain to extract the Frequency Response Function (FRF) and identify the vibration modes. The first natural frequency, corresponding to the primary bending mode, was found to be approximately 1860 Hz, and the coherence value of 0.81 confirmed the reliability of the experimental measurements.

In the numerical phase, a detailed three-dimensional model of the assembly was developed in Abaqus/CAE. By incorporating realistic material properties, boundary constraints, and the connection configuration between the blade and shaft, a finite element modal analysis was performed. The numerical results yielded a first natural frequency of 1861 Hz, which differed from the experimental value by only 0.05 %, indicating excellent agreement and high modeling accuracy. The strong correlation between the experimental and numerical results demonstrates the capability of the developed model to accurately predict the real dynamic behavior of the system. This validated approach provides a reliable basis for advanced vibration analyses, design optimization, and resonance prediction in high-speed turbomachinery applications.